The National Desk — where the weather is today · Plaincast
Slight
risk of severe thunderstorms · PARTS OF THE NORTHERN ROCKIES/PLAINS AND GREAT BASIN
Thunderstorms capable of producing large hail and severe wind gusts are forecast across parts of the northern Rockies/Plains this afternoon and evening. Other thunderstorms with mainly a severe wind threat are probable over portions of the northern Great Basin.
From the Storm Prediction Center's Day 1 Convective Outlook · issued 2001 UTC.
Subtle adjustments were made to the existing Marginal/Slight risk areas based on ongoing convective trends. Recent CAM/TLE guidance suggests that upscale growth of convection into one or more linear clusters may result in localized corridors of greater damaging/severe wind coverage across portions of northern Utah and central Montana. The evolution of this scenario remains somewhat uncertain, however, which precludes the addition of 30% wind probabilities at this time. See MCDs 2099, 2100, and 2101 for additional short-term details.
Recent mesoanalysis and observational data depict modestly elongated hodographs and effective shear around 35 knots in place across portions of the Coastal Carolinas. Despite poor mid-level lapse rates, this may allow for the occurrence of isolated, marginally severe hail with the most robust updraft cores. Thus, a targeted 5% hail probability area was included with this update, which is similarly supported by AI/ML guidance and recent CAM solutions.
Elsewhere, the forecast remains largely on track, with only minor adjustments made based on the latest forecast and observational trends. See the discussion below for additional details.
Today · Day 1
Slight
PARTS OF THE NORTHERN ROCKIES/PLAINS AND GREAT BASIN
Tomorrow · Day 2
Slight
PORTIONS OF THE CENTRAL HIGH PLAINS AND THE LOWER…
Day 3
Slight
PORTIONS OF THE CENTRAL AND SOUTHERN HIGH PLAINS
The Wire · severe warnings by forecast office
- Indianapolis (IND)Flood Warning ×13Edwards, IL & Gallatin, IL +5 more · until 3:00 AM EDT
- Oklahoma City (OUN)Extreme Heat Warning ×4Beckham & Washita +1 more · until 8:00 PM CDT
- Phoenix (PSR)Extreme Heat Warning ×4Parker Valley & Kofa +10 more · until 3:00 AM MST
- LUBExtreme Heat Warning ×3Briscoe & Hall +3 more
- TFXSevere Thunderstorm Warning ×3Blaine, MT & Hill, MT
- AMAExtreme Heat Warning ×2Palo Duro Canyon
- Flagstaff (FGZ)Flash Flood Warning ×2Apache, AZ · until 5:30 PM MST
- ILXFlood Warning ×2Cass, IL & Fulton, IL +1 more
- PIHSevere Thunderstorm Warning ×2Bannock, ID & Oneida, ID +1 more
- Pueblo (PUB)Flash Flood Warning ×2Custer, CO & Pueblo, CO · until 6:30 PM MDT
- Salt Lake City (SLC)Flash Flood Warning ×2Garfield, UT & Wayne, UT · until 8:15 PM MDT
- Tucson (TWC)Extreme Heat Warning ×2Upper Santa Cruz River and Altar Valleys including Nogales & Upper San Pedro River Valley including Sierra Vista/Benson +1 more · until 5:00 AM MST
…and 15 more offices under severe warnings.
Next Day 1 outlook expected by 0100 UTC · this page re-inks every 10 minutes.