A thunderstorm moving through Saginaw Bay produced a wind gust to 37 knots.
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The episode as NWS DTX wrote it up.
A thunderstorm moving through Saginaw Bay produced a wind gust to 37 knots.
The local office's own words before the first event, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Detroit, MI wrote its last area forecast discussion before the first event at Jul 22, 2:52 PM EST, 1 hour 1 minute earlier.
Area Forecast Discussion National Weather Service Detroit/Pontiac MI 352 PM EDT Wed Jul 22 2020 .DISCUSSION... The washed out warm front and moisture feed over the area led to plenty of cloud cover today that has gradually scattered as daytime heating and mixing has picked up. Humid near-surface conditions characterized by dew points around 70 degrees will continue through the day as showers and a few thunderstorms dot the region. Instability is not overly impressive this afternoon with weak midlevel lapse rates and a delayed start in better surface heating, but MLCAPE on the order of 1000-1500 J/kg and deep-layer shear around 30-35 kt north of M-59 suggest at least a marginal strong wind threat in any more robust cells. Otherwise, brief locally moderate to heavy downpours and lightning will be the main hazards with any storms this afternoon. A weak cold front tracks across the state this evening and ushers out most of the showers and storms, though some weak convection may linger in the far eastern areas into tonight. Elevated low-level moisture remains in place tonight and may lead to some patchy fog and stratus into the early morning with low temps falling to the mid to upper 60s. Upper troughing will be slow to depart the northern Lakes on Thursday with cooler north to northwest flow over SE Michigan during the day. This will keep highs a few degrees lower than today for most areas, with a mostly cloudy morning becoming a partly cloudy afternoon. Hi-res guidance depict a surface trough dropping south from Lake Huron midday. This feature coincident with deep-layer cyclonic flow, a shortwave moving in, and just enough remnant surface moisture may be enough to touch off a few shallow showers across the center of the CWA. Otherwise, dry weather will prevail Thursday into Friday as high pressure builds in over the Great Lakes. Highs will be in the lower to mid 80s both days with lower humidity than today. The longwave pattern undergoes amplification by the late week as a stronger wave moves into British Columbia. This strengthens the ridge downstream over the Midwest on Friday while heat builds over the Plains. The ridge begins to flatten by Saturday which allows some of this heat to make it eastward into the Great Lakes. Thus, a warming trend is expected this weekend with highs possibly getting back into the 90s by Sunday. Mid-range guidance is in decent agreement that the next chance for widespread rain will come Sunday night as a cold front pushes through. A large trough is then advertised for the midweek period which would bring temperatures back near or slightly below normal for late July. && .MARINE... Low pressure has started its slow trek across the central Great Lakes today. Currently centered over northern Lake Michigan, the low center will track east-southeast this afternoon going a bit further south than forecast yesterday, likely tracking over southern Lake Huron rather than the central part of the lake. This slight deviation south will lead to northeasterly winds turning northerly this evening as the low moves across southern Huron. Shower and thunderstorm chances will continue into the late evening/early night timeframe. Winds, outside of thunderstorms, will still remain on the lighter side with gusts staying below 15-20kts. High pressure then follows, building over the region later in the day Thursday reinforcing the light northerly flow. && .PREV DISCUSSION... Issued at 137 PM EDT Wed Jul 22 2020 AVIATION... Very moist low-level airmass resulting from washed out warm frontal boundary across the airspace has resulted in plentiful low stratus that has persisted into the afternoon with only a gradual breakup mainly at KMBS and KFNT. Where pockets of sunshine are able to filter in will be crucial to potential thunderstorm development this afternoon ahead of an approaching cold front, with ongoing showers in vicinity of KMBS/KFNT already opportunizing on the better instability. Have included TEMPO groups for these sites for thunder, but confidence is not high enough yet for the southern sites given still abundant cloud cover that needs to erode away for more substantial daytime heating to take place. Regardless, prime window for shower/embedded thunder activity will be in the 19z-00z window. Brief window of clearing early overnight will give way to potential MVFR fog/stratus towards sunrise, especially as southwest winds trend light and flip to a north/northeasterly direction. Better potential for stratus appears to be at KMBS/KFNT where a slightly stronger gradient will be in place, whereas fog may be more prevalent at the southern sites with a more calm wind. Skies then gradually clear out to end the TAF period Thursday. For DTW...Low potential remains for thunder 20z-00z, but confidence still low to include a TEMPO group at this time due to abundant low cloud. MVFR fog possible towards sunrise 08z-12z. DTW THRESHOLD PROBABILITIES... * Moderate for ceilings aob 5000 ft into this evening. Low tonight. * Low for thunderstorms this afternoon 20z-00z. && .DTX WATCHES/WARNINGS/ADVISORIES... MI...NONE. Lake Huron...NONE. Lake St Clair...NONE. Michigan waters of Lake Erie...NONE. && DISCUSSION...TF MARINE.......KDK AVIATION.....IRL You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit.
Hazardous Weather Outlook National Weather Service Detroit/Pontiac MI 345 AM EDT Wed Jul 22 2020 MIZ055-061>063-068>070-075-076-082-083-230745- Sanilac-Genesee-Lapeer-St. Clair-Livingston-Oakland-Macomb-Washtenaw- Wayne-Lenawee-Monroe- 345 AM EDT Wed Jul 22 2020 This hazardous weather outlook is for portions of southeast Michigan. .DAY ONE...Today and Tonight There is a chance for thunderstorms today but severe weather is not expected. Storm motion will be from WNW to ESE at 30 mph. Locally heavy rainfall will be possible within any robust storm. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday The next best chance for thunderstorms will be late Sunday and Sunday night. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today and tonight. MIZ047>049-053-054-060-230745- Midland-Bay-Huron-Saginaw-Tuscola-Shiawassee- 345 AM EDT Wed Jul 22 2020 This hazardous weather outlook is for portions of southeast Michigan. .DAY ONE...Today and Tonight There is a chance for thunderstorms today but severe weather is not expected. Storm motion will be from WNW to ESE at 30 mph. Locally heavy rainfall will be possible within any robust storm. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday The next best chance for thunderstorms will be late Sunday and Sunday night. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today and tonight. LCZ460-LEZ444-LHZ361>363-421-422-441>443-462>464-230745- Lake St Clair- Michigan Waters of Lake Erie from Detroit River to North Cape MI- Lake Huron from 5NM east of Mackinac Bridge to Presque Isle Lt beyond 5 NM off shore- Lake Huron from Presque Isle Light to Sturgeon Point MI beyond 5NM off shore- Lake Huron from Sturgeon Point to Alabaster MI beyond 5NM off shore- Outer Saginaw Bay SW of Alabaster to Port Austin MI to Inner Saginaw Bay-Inner Saginaw Bay SW of Point Au Gres to Bay Port MI- Port Austin to Harbor Beach MI-Harbor Beach to Port Sanilac MI- Port Sanilac to Port Huron MI- Lake Huron from Port Austin to Harbor Beach beyond 5NM Off Shore- Lake Huron from Harbor Beach to Port Sanilac beyond 5NM Off Shore- Lake Huron from Port Sanilac to Port Huron beyond 5NM Off Shore- 345 AM EDT Wed Jul 22 2020 This hazardous weather outlook is for portions of Lake Erie, Lake Huron and Lake St Clair. .DAY ONE...Today and Tonight There is a chance for thunderstorms today but severe weather is not expected. Storm motion will be from WNW to ESE at 30 mph. Locally heavy rainfall will be possible within any robust storm. .DAYS TWO THROUGH SEVEN...Thursday through Tuesday The next best chance for thunderstorms will be late Sunday and Sunday night. .SPOTTER INFORMATION STATEMENT... Spotter activation will not be needed today and tonight. You can obtain your latest National Weather Service forecasts online at www.weather.gov/detroit. DRC
The Detroit radar (KDTX), 113 km away, was scanning. The volume nearest the first event began at 20:54 UTC.
1 marine thunderstorm wind. Local standard time, as filed.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Lake Huron in 2020Every state in 2020This day in weather history
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 904917.