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by Webmaster - Wed 20 May 2026 01:30:PM
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by Webmaster - Wed 20 May 2026 01:30:PM
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by Webmaster - Wed 20 May 2026 01:30:PM
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World Earthquake Report for Wednesday, 20 May 2026
• Small magnitude 3.7 quake hits 33 miles southwest of Wales, Alaska, United ...
• Volcano earthquake report for Wednesday, 20 May 2026
• Moderate mag. 4.0 earthquake - Chiapas, Mexico, on Wednesday, May 20, 2026,...
• Moderate mag. 4.2 earthquake - Sea of Okhotsk, 72 km northeast of Makubetsu...
• Moderate mag. 4.6 earthquake - Philippine Sea, 64 km northeast of Taitung, ...
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World Earthquake Report for Wednesday, 20 May 2026
Webmaster
1 hour ago
World Earthquake Report for Wednesday, 20 May 2026 Worldwide earthquakes above magnitude 3 during the past 24 hours on 20 May 2026 Summary: 8 quakes 5.0+, 35 quakes 4.0+, 155 quakes 3.0+, 338 quakes 2.0+ (536 total)This report is being updated every hour.Magnitude 5+: 8 earthquakes Magnitude 4+: 35 earthquakes Magnitude 3+: 155 earthquakes Magnitude 2+: 338 earthquakes No quakes of magnitude 6 or higher 10 largest earthquakes in the world (past 24 hours)Wednesday, May 20, 2026, at 11:46 am (GMT +9) - Tuesday, May 19, 2026, at 12:57 pm (Lima time) - Wednesday, May 20, 2026, at 09:00 am (Istanbul time) - Wednesday, May 20, 2026, at 06:28 pm (Makassar time) - Wednesday, May 20, 2026, at 08:30 am (GMT +9) - Wednesday, May 20, 2026, at 09:40 pm (GMT +12) - Wednesday, May 20, 2026, at 01:40 am (Samarkand time) - Tuesday, May 19, 2026, at 08:46 pm (GMT -6) - Wednesday, May 20, 2026, at 09:43 am (Krasnoyarsk time) - Wednesday, May 20, 2026, at 03:19 am (GMT -6) - Earthquakes reported feltWednesday, May 20, 2026, at 09:00 am (Istanbul time) - Wednesday, May 20, 2026, at 11:46 am (GMT +9) - Wednesday, May 20, 2026, at 01:40 am (Samarkand time) - Tuesday, May 19, 2026, at 12:57 pm (Lima time) - Tuesday, May 19, 2026, at 01:42 pm (GMT -6) - Tuesday, May 19, 2026, at 11:34 pm (Catamarca time) - Wednesday, May 20, 2026, at 06:11 am (GMT +3) - Wednesday, May 20, 2026, at 06:28 pm (Makassar time) - Wednesday, May 20, 2026, at 01:18 am (Efate time) - Wednesday, May 20, 2026, at 08:30 am (GMT +9) - Tuesday, May 19, 2026, at 10:42 pm (Dushanbe time) - Tuesday, May 19, 2026, at 12:42 pm (GMT -7) - Wednesday, May 20, 2026, at 10:26 am (Manila time) - Tuesday, May 19, 2026, at 11:20 pm (Port Moresby time) - Wednesday, May 20, 2026, at 12:07 pm (GMT +3) - Tuesday, May 19, 2026, at 09:03 pm (GMT -1) - Tuesday, May 19, 2026, at 08:17 am (GMT -6) - Tuesday, May 19, 2026, at 01:47 pm (GMT -4) - Wednesday, May 20, 2026, at 04:00 pm (GMT +3) - Wednesday, May 20, 2026, at 09:11 am (Taipei time) - Tuesday, May 19, 2026, at 09:34 am (GMT -4) - Earthquake stats  https://www.volcanodiscovery.com/earthquake/news/302940/World-Earthquake-Report-for-Wednesday-20-May-2026.html
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Small magnitude 3.7 quake hits 33 miles southwest of Wales, Alaska, United States early morning
Webmaster
1 hour ago
Small magnitude 3.7 quake hits 33 miles southwest of Wales, Alaska, United States early morning A shallow magnitude 3.7 earthquake was reported early morning near Wales, Nome, Alaska, USA. According to the United States Geological Survey, the quake hit on Wednesday, May 20th, 2026, at 5:04 am local time at a shallow depth of 18 miles. Shallow earthquakes are felt more strongly than deeper ones as they are closer to the surface. The exact magnitude, epicenter, and depth of the quake might be revised within the next few hours or minutes as seismologists review data and refine their calculations, or as other agencies issue their report. Our monitoring service identified a second report from The Incorporated Research Institutions for Seismology (IRIS) which listed the quake at magnitude 3.7 as well. A third agency, the European-Mediterranean Seismological Centre (EMSC), reported the same quake at magnitude 3.7. Towns or cities near the epicenter where the quake might have been felt as very weak shaking include Wales (pop. 150) located 33 miles from the epicenter. In Diomede (pop. 120, 42 miles away), and Port Clarence (pop. 24, 51 miles away), the quake was probably not felt.
Earthquake data: Date & time: May 20, 2026 05:04 am (GMT -8) local time (20 May 2026 13:04 GMT)Magnitude: 3.7 Depth: 28.40 km Epicenter latitude / longitude: 65.17°N / 168.58°W  ( Alaska, United States) Primary data source: USGShttps://www.volcanodiscovery.com/earthquake/news/303009/Small-magnitude-37-quake-hits-33-miles-southwest-of-Wales-Alaska-United-States-early-morning-.html
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Friday: Light Rain Showers, Minimum Temperature: 13°C (55°F) Maximum Temperature: 25°C (77°F)
Webmaster
1 hour ago
Maximum Temperature: 25°C (77°F), Minimum Temperature: 13°C (55°F), Wind Direction: southerly, Wind Speed: 10mph, Visibility: Good, Pressure: 1023mb, Humidity: 62%, UV Risk: 5, Pollution: Low, Sunrise: 04:59 BST, Sunset: 21:13 BST Source: Friday: Light Rain Showers, Minimum Temperature: 13°C (55°F) Maximum Temperature: 25°C (77°F)
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Thursday: Light Rain, Minimum Temperature: 12°C (54°F) Maximum Temperature: 21°C (70°F)
Webmaster
1 hour ago
Maximum Temperature: 21°C (70°F), Minimum Temperature: 12°C (54°F), Wind Direction: south-westerly, Wind Speed: 8mph, Visibility: Moderate, Pressure: 1023mb, Humidity: 77%, UV Risk: 3, Pollution: Low, Sunrise: 05:00 BST, Sunset: 21:12 BST Source: Thursday: Light Rain, Minimum Temperature: 12°C (54°F) Maximum Temperature: 21°C (70°F)
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Today: Light Rain Showers, Minimum Temperature: 11°C (51°F) Maximum Temperature: 16°C (61°F)
Webmaster
1 hour ago
Maximum Temperature: 16°C (61°F), Minimum Temperature: 11°C (51°F), Wind Direction: westerly, Wind Speed: 11mph, Visibility: Good, Pressure: 1016mb, Humidity: 66%, UV Risk: 2, Pollution: Low, Sunrise: 05:01 BST, Sunset: 21:10 BST Source: Today: Light Rain Showers, Minimum Temperature: 11°C (51°F) Maximum Temperature: 16°C (61°F)
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Volcano earthquake report for Wednesday, 20 May 2026
Webmaster
1 hour ago
Volcano earthquake report for Wednesday, 20 May 2026 World map showing volcanoes with shallow (less than 50 km) earthquakes within 20 km radius during the past 24 hours on 20 May 2026 Number in brackets indicate nr of quakes. Quakes detected near: Ambang (1 quake mag 3.0), Bardarbunga (24 quakes between mag 0.0-1.7), Campi Flegrei (Phlegrean Fields) (3 quakes between mag 0.1-3.0), Chinameca (1 quake mag 2.3), Clear Lake (21 quakes between mag 0.3-2.0), Davidof (1 quake mag 1.7) Eldey (25 quakes between mag 0.1-2.0), Gilbanta (1 quake mag 5.2), Katla (2 quakes between mag 1.2-1.5), Kenger (1 quake mag 1.0), Kilauea (2 quakes between mag 1.6-1.7), Krakatau (1 quake mag 2.9), Kyejo (1 quake mag 3.0), Laguna Aramuaca (1 quake mag 3.2), Lanzarote (2 quakes between mag 1.7-3.0), Ljósufjöll (4 quakes between mag 0.0-2.0), Loihi (1 quake mag 2.1), Malindang (1 quake mag 1.9), Nevado de Longavi (3 quakes between mag 2.8-3.7), Okataina (Tarawera) (3 quakes between mag 1.5-2.0), Prestahnukur (24 quakes between mag 0.5-2.1), Sangeang Api (13 quakes between mag 2.1-3.5), Talakmau (1 quake mag 2.1), Tenerife (2 quakes between mag 0.8-1.0), Torfajökull (10 quakes between mag 0.2-1.1), Trident (1 quake mag 1.1), White Island (2 quakes between mag 2.1-2.9) (updated 12h50) Note: Earthquakes within 20 km from and at depths less than 50 km under active volcanoes are reported. The list is not complete because many volcanoes are not monitored and/or seismic data in high resolution is not available publicly.
Volcanoes with recent earthquakes above magnitude 2 or more than 10 quakes are listed below:
Ambang volcano (Sulawesi & Sangihe Islands): magnitude 3.0 earthquakeA magnitude 3.0 earthquake occurred at the volcano 22 hours ago. The quake, which might be volcanic in origin, was located at a depth of 12.00 km depth at 8 km distance NW from the volcano. Earthquake details: 3.0 quake Kota Kotamobagu, 92 km southwest of Manado, Indonesia, May 19, 2026 10:56 pm (GMT +8) (8 km NW) All earthquakes at AmbangBardarbunga volcano (Iceland): 24 earthquakes up to magnitude 1.7Possible earthquake swarm: 24 earthquakes occurred near (under) the volcano during 23 hours, the last being recorded quake 19 minutes ago. Hypocenter depths ranged between 21.20 and 0.00 km. Earthquake details: (only 5 largest) 1.7 quake Iceland: 7.7 km E of Bárðarbunga May 20, 2026 06:31 am (Reykjavik time) (8 km E) 1.6 quake Iceland: 8.2 km ESE of Bárðarbunga May 19, 2026 04:38 pm (Reykjavik time) (8 km E) 1.5 quake 7.1 km ESE of Bárðarbunga May 19, 2026 01:52 pm (Universal Time) (7 km E) 1.5 quake 9.0 km E of Bárðarbunga May 19, 2026 07:24 pm (Universal Time) (9 km E) 1.0 quake 4.3 km E of Bárðarbunga May 19, 2026 01:52 pm (Universal Time) (5 km E) All earthquakes at BardarbungaCampi Flegrei (Phlegrean Fields) volcano (Italy): 3 earthquakes up to magnitude 3.03 earthquakes occurred near (under) the volcano during 12 hours, the last being recorded quake 5 hours ago. Hypocenter depths ranged between 10.00 and 0.03 km. Earthquake details: Reported seismic-like event (likely no quake): 6.2 km northwest of Naples, Napoli, Campania, Italy, May 19, 2026 10:46 pm (GMT +2) (11 km NE) 0.4 quake 3 km southeast of Pozzuoli, Napoli, Campania, Italy, May 20, 2026 10:16 am (GMT +2) (2 km W) 0.1 quake 1.2 km north of Pozzuoli, Napoli, Campania, Italy, May 20, 2026 02:56 am (Universal Time) (5 km NW) All earthquakes at Campi Flegrei (Phlegrean Fields)Chinameca volcano (El Salvador): magnitude 2.3 earthquakeA magnitude 2.3 earthquake occurred at the volcano 19 hours ago. The quake, which might be volcanic in origin, was located at a depth of 6.00 km depth at 12 km distance N from the volcano. Earthquake details: 2.3 quake 18 km northwest of San Miguel, Departamento de San Miguel, El Salvador, May 19, 2026 11:47 am (GMT -6) (12 km N) All earthquakes at ChinamecaClear Lake volcano (California): 21 earthquakes up to magnitude 2.0Possible earthquake swarm: 21 earthquakes occurred near (under) the volcano during 21 hours, the last being recorded quake 34 minutes ago. Hypocenter depths ranged between 7.55 and 0.21 km. Earthquake details: (only 5 largest) 2.0 quake Mendocino County, 13 mi southwest of Clearlake, Lake County, California, United States, May 19, 2026 05:43 pm (GMT -7) (14 km SSW) 1.5 quake 13 mi southwest of Clearlake, Lake County, California, United States, May 20, 2026 03:05 am (GMT -7) (19 km S) 1.3 quake Lake County, 28 mi north of Santa Rosa, Sonoma County, California, United States, May 19, 2026 02:05 pm (GMT -7) (15 km S) 1.1 quake Mendocino County, 29 mi north of Santa Rosa, Sonoma County, California, United States, May 19, 2026 05:44 pm (GMT -7) (14 km SSW) 1.1 quake 28 mi north of Santa Rosa, Sonoma County, California, United States, May 19, 2026 09:08 pm (GMT -7) (16 km SSW) All earthquakes at Clear LakeEldey volcano (Iceland): 25 earthquakes up to magnitude 2.0Possible earthquake swarm: 25 earthquakes occurred near (under) the volcano during 19 hours, the last being recorded quake 5 hours ago. Hypocenter depths ranged between 11.20 and 0.00 km. Earthquake details: (only 5 largest) 2.0 quake 9.1 km N of Eldey May 19, 2026 01:41 pm (Universal Time) (10 km N) 1.4 quake Iceland: 9.2 km NW of Reykjanestá May 19, 2026 03:35 pm (Reykjavik time) (17 km NNE) 1.2 quake 7.6 km N of Eldey May 19, 2026 01:37 pm (Universal Time) (9 km N) 1.1 quake 8.0 km N of Eldey May 19, 2026 01:24 pm (Universal Time) (9 km N) 1.0 quake Iceland: 9.4 km N of Eldey May 20, 2026 07:58 am (Reykjavik time) (10 km N) All earthquakes at EldeyEldey is located at the beginning of the Reykjanes Ridge off the SW tip of Iceland. Its highest elevation is the top of Eldey Island, but most of the volcanic edifice is submerged. Several eruptions occurred in historic times, last in 1926. Gilbanta volcano (Lesser Sunda Islands): magnitude 5.2 earthquakeA magnitude 5.2 earthquake occurred at the volcano 2 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 16 km distance NNW from the volcano. Earthquake details: 5.2 quake Flores Sea, 17 km east of Pulau Sangeang Island, West Nusa Tenggara, Indonesia, May 20, 2026 06:28 pm (Makassar time) (16 km NNW) All earthquakes at GilbantaKrakatau volcano (Sunda Strait): magnitude 2.9 earthquakeA magnitude 2.9 earthquake occurred at the volcano 19 hours ago. The quake, which might be volcanic in origin, was located at a depth of 3.00 km depth at 12 km distance SW from the volcano. Earthquake details: 2.9 quake Indian Ocean, 31 km southwest of Pulau Sebesi Island, Lampung, Indonesia, May 20, 2026 12:55 am (GMT +7) (12 km SW) All earthquakes at KrakatauKyejo volcano (Tanzania): magnitude 3.0 earthquakeA magnitude 3.0 earthquake occurred at the volcano 2 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 5 km distance SSW from the volcano. Earthquake details: Reported quake or seismic-like event: 3.5 km northeast of Gaborone, Gaborone, Botswana, May 20, 2026 12:49 pm (GMT +2) (5 km SSW) All earthquakes at KyejoLaguna Aramuaca volcano (El Salvador): magnitude 3.2 earthquakeA magnitude 3.2 earthquake occurred at the volcano 23 hours ago. The quake, which might be volcanic in origin, was located at a depth of 4.60 km depth at 12 km distance S from the volcano. Earthquake details: 3.2 quake 20 km southeast of San Miguel, Departamento de San Miguel, El Salvador, May 19, 2026 07:22 am (GMT -6) (12 km S) All earthquakes at Laguna AramuacaLanzarote volcano (Canary Islands): 2 earthquakes up to magnitude 3.02 earthquakes occurred near (under) the volcano during 60 seconds, the last being recorded quake 17 hours ago. Hypocenter depths ranged between 10.00 and 4.00 km. Earthquake details: Reported seismic-like event (likely no quake): 9.2 km west of Arrecife, Las Palmas, Canary Islands, Spain, May 19, 2026 08:28 pm (GMT +1) (12 km ESE) 1.7 quake 20 km north of Yaiza, Las Palmas, Canary Islands, Spain, May 19, 2026 08:29 pm (GMT +1) (15 km N) All earthquakes at LanzaroteLoihi volcano (Hawai'i (Big Island)): magnitude 2.1 earthquakeA magnitude 2.1 earthquake occurred at the volcano 14 hours ago. The quake, which might be volcanic in origin, was located at a depth of 36.05 km depth at 19 km distance NW from the volcano. Earthquake details: 2.1 quake North Pacific Ocean, 24 mi east of Hawaiian Ocean View, Hawaii County, Hawaii, United States, May 19, 2026 01:08 pm (GMT -10) (19 km NW) All earthquakes at LoihiNevado de Longavi volcano (Central Chile and Argentina): 3 earthquakes up to magnitude 3.73 earthquakes occurred near (under) the volcano during 7 hours, the last being recorded quake 1 hour 16 minutes ago. Hypocenter depths ranged between 7.80 and 6.80 km. Earthquake details: 3.7 quake 51 km southeast of Linares, Provincia de Linares, Region del Maule, Chile, May 20, 2026 12:49 am (GMT -4) (7 km WSW) 3.4 quake 51 km southeast of Linares, Provincia de Linares, Region del Maule, Chile, May 20, 2026 07:33 am (GMT -4) (11 km WSW) 2.8 quake 47 km southeast of Linares, Provincia de Linares, Region del Maule, Chile, May 20, 2026 07:22 am (GMT -4) (11 km W) All earthquakes at Nevado de LongaviPrestahnukur volcano (Iceland): 24 earthquakes up to magnitude 2.1Possible earthquake swarm: 24 earthquakes occurred near (under) the volcano during 11 hours, the last being recorded quake 2 hours ago. Hypocenter depths ranged between 12.90 and 0.10 km. Earthquake details: (only 5 largest) 2.1 quake Iceland: 15.6 km SSE of Húsafell May 20, 2026 09:41 am (Reykjavik time) (12 km WSW) 1.9 quake Iceland: 15.6 km SSE of Húsafell May 20, 2026 09:43 am (Reykjavik time) (12 km WSW) 1.9 quake Iceland: 15.6 km SSE of Húsafell May 20, 2026 06:35 am (Reykjavik time) (11 km WSW) 1.8 quake Iceland: 15.2 km SSE of Húsafell May 20, 2026 07:05 am (Reykjavik time) (12 km WSW) 1.6 quake 15.6 km SSE of Húsafell May 20, 2026 07:23 am (Universal Time) (12 km WSW) All earthquakes at PrestahnukurSangeang Api volcano (Lesser Sunda Islands): 13 earthquakes up to magnitude 3.5Possible earthquake swarm: 13 earthquakes occurred near (under) the volcano during 21 hours, the last being recorded quake 1 hour 27 minutes ago. Hypocenter depths ranged between 13.00 and 10.00 km. Earthquake details: (only 5 largest) 3.5 quake Flores Sea, 17 km northeast of Pulau Sangeang Island, Indonesia, May 20, 2026 12:17 pm (GMT +8) (17 km NE) 3.4 quake Flores Sea, 16 km east of Pulau Sangeang Island, West Nusa Tenggara, Indonesia, May 20, 2026 06:33 pm (GMT +8) (16 km ENE) 2.9 quake Flores Sea, 14 km east of Pulau Sangeang Island, West Nusa Tenggara, Indonesia, May 20, 2026 07:02 pm (GMT +8) (14 km ENE) 2.8 quake Flores Sea, 19 km northeast of Pulau Sangeang Island, Indonesia, May 19, 2026 10:28 pm (GMT +8) (19 km NE) 2.6 quake Flores Sea, 17 km east of Pulau Sangeang Island, West Nusa Tenggara, Indonesia, May 20, 2026 07:11 pm (GMT +8) (17 km E) All earthquakes at Sangeang ApiTalakmau volcano (Sumatra): magnitude 2.1 earthquakeA magnitude 2.1 earthquake occurred at the volcano 9 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 3 km distance ESE from the volcano. Earthquake details: 2.1 quake Kabupaten Pasaman, 58 km northwest of Bukittinggi, Indonesia, May 20, 2026 11:16 am (GMT +7) (3 km ESE) All earthquakes at TalakmauUnnamed 49.00°N/34.5°W volcano (Atlantic Ocean): magnitude 3.0 earthquakeA magnitude 3.0 earthquake occurred at the volcano 12 hours ago. The quake, which might be volcanic in origin, was located at a depth of 10.00 km depth at 15 km distance WNW from the volcano. Earthquake details: Uncertain quake: M3.0, 15 km southeast of Saguenay, Saguenay/Lac-Saint-Jean, Quebec, Canada, May 19, 2026 08:21 pm (GMT -4) (15 km WNW) All earthquakes at Unnamed 49.00°N/34.5°WWhite Island volcano (New Zealand): 2 earthquakes up to magnitude 2.92 earthquakes occurred near (under) the volcano during 1 hour 36 minutes, the last being recorded quake 4 hours ago. Hypocenter depths ranged between 5.00 and 2.00 km. Earthquake details: 2.9 quake South Pacific Ocean, 53 km north of Whakatane, Bay of Plenty, New Zealand, May 20, 2026 07:14 pm (GMT +12) (3 km NW) 2.1 quake South Pacific Ocean, 49 km north of Whakatane, Bay of Plenty, New Zealand, May 20, 2026 08:50 pm (GMT +12) (3 km SW) All earthquakes at White Islandhttps://www.volcanodiscovery.com/earthquakes-volcanoes/news/302925/Volcano-earthquake-report-for-Wednesday-20-May-2026.html
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SPC May 20, 2026 1300 UTC Day 1 Convective Outlook
Webmaster
2 hours ago
SPC May 20, 2026 1300 UTC Day 1 Convective OutlookSPC 1300Z Day 1 Outlook  Day 1 Convective Outlook NWS Storm Prediction Center Norman OK 0730 AM CDT Wed May 20 2026
Valid 201300Z - 211200Z
...THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS ACROSS PARTS OF THE CENTRAL APPALACHIANS INTO THE MID-ATLANTIC AND SOUTHERN NEW ENGLAND...AND PARTS OF WEST/SOUTH-CENTRAL TEXAS...
...SUMMARY... Scattered severe/damaging winds and isolated hail will be possible with thunderstorms from the central Appalachians into the Mid-Atlantic and southern New England this afternoon and evening. Severe thunderstorms with large hail and isolated severe gusts may also occur today across parts of west/south-central Texas.
...Ohio Valley into the Mid-Atlantic and Southern New England... On the southern fringe of upper troughing over eastern Canada and the Great Lakes, a weak/convectively augmented mid-level shortwave trough will progress northeastward across the OH Valley and central Appalachians through the day, eventually reaching the Mid-Atlantic tonight. Robust daytime heating of a modestly moist low-level airmass (surface dewpoints generally in the low to mid 60s) ahead of a surface cold front will aid in the development of moderate instability by early afternoon. Ongoing convection across OH/KY this morning may eventually strengthen as it encounters this destabilizing airmass, and additional thunderstorms are expected to develop along/near the cold front by mid afternoon from the central Appalachians into portions of the Mid-Atlantic and southern New England.
Stronger flow aloft will tend to lag/remain north of the cold front, but modest enhancement to the west-southwesterly mid-level flow along/near the front should support around 20-30 kt of deep-layer shear. This will be sufficient for some updraft organization with mainly multicells expected, although marginal supercell structures may occur. Low-level lapse rates are expected to become quite steep through the day, evidenced by a general lack of clouds on recent visible satellite imagery from central/eastern WV into the Mid-Atlantic. This will likely aid efficient downward momentum transfer in convective downdrafts, with scattered severe/damaging winds possible as multiple clusters spread east-northeastward through the afternoon/evening. Isolated hail may also occur with the stronger cores. A Slight Risk for severe/damaging winds has been introduced from parts of WV to southern New England given increased confidence in multiple clusters traversing a narrow zone along/ahead of the front.
...Eastern New Mexico into West/South-Central Texas... A squall line has generally moved offshore the lower/middle TX Coast this morning. In its wake, a post-frontal low-level upslope flow regime will persist today across west TX into eastern NM. Embedded within large-scale upper troughing over the Great Basin/Southwest, a low-amplitude shortwave trough over northern Mexico this morning will move northeastward across the southern High Plains by this afternoon. A relatively early start to convective development appears probable across the higher terrain of far west TX, possibly as early as 17-19Z. With a combination of moderate instability and 40-50 kt of deep-layer shear forecast, supercells with mainly a large hail threat should be the primary mode initially. Additional robust thunderstorms may form later in the afternoon/early evening across a broader portion of the southern High Plains, and also pose a threat for large hail and isolated severe winds. Some potential for clustering this evening remains apparent into south-central TX, and supercells from north-central Mexico could also move into this region this evening/overnight.
..Gleason/Marsh.. 05/20/2026
Read morehttps://www.spc.noaa.gov/products/outlook/day1otlk_1300.html
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SPC MD 800
Webmaster
2 hours ago
SPC MD 800MD 0800 CONCERNING SEVERE POTENTIAL...WATCH UNLIKELY FOR PORTIONS OF THE OHIO VALLEY 
Mesoscale Discussion 0800 NWS Storm Prediction Center Norman OK 0650 AM CDT Wed May 20 2026
Areas affected...portions of the Ohio Valley
Concerning...Severe potential...Watch unlikely
Valid 201150Z - 201345Z
Probability of Watch Issuance...5 percent
SUMMARY...Thunderstorms will continue moving east-northeast this morning, with additional thunderstorms likely to develop. The overall environment should limit hail potential this morning, but may become favorable for isolated damaging winds. A watch is currently not expected.
DISCUSSION...Showers and thunderstorms are ongoing this morning across portions of the Ohio Valley, along and south of a surface cold front. This region is beneath modest deep-layer ascent associated with an anticyclonically curved 140-knot upper-level jet north of the Great Lakes per objective analyses. These showers and thunderstorms are expected to continue moving northeast, embedded within broad southwest flow.
The overall thermodynamic environment this morning is rather poor, with objectively analyzed MUCAPE values generally less than 250 J/kg, and the kinematic fields are not much better, with effective-layer shear generally less than 30 knots. However, the environment is very moist, with objectively analyzed PW values ranging from 1.5 to 1.7 inches this morning.
Thunderstorm intensity should gradually increase this morning with diurnal heating. Midlevel lapse rates are generally poor across the region which should limit any hail potential, but as low-level lapse rates steepen with daytime heating an isolated damaging wind gust cannot be ruled out.
Although the potential for isolated damaging wind gusts will increase later this morning and afternoon along and ahead of these developing storms, the potential should remain very isolated for the next couple of hours. Thus, a watch is not expected in the near term.
..Marsh/Gleason.. 05/20/2026
...Please see www.spc.noaa.gov for graphic product...
ATTN...WFO...RNK...PBZ...RLX...CLE...JKL...ILN...LMK...
LAT...LON 40088338 40998209 40678059 40147998 39127977 38148001 37438156 37128289 37328424 37508496 38878467 40088338
MOST PROBABLE PEAK WIND GUST...55-70 MPH MOST PROBABLE PEAK HAIL SIZE...UP TO 1.25 IN
Read morehttps://www.spc.noaa.gov/products/md/md0800.html
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