Alert archive / Michigan / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 51, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Jul 19, 2020, 7:07 AM EDT for Mason County, Michigan. It was in force for 39 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 19, 2020, 7:07 AM EDT (11:07 UTC)
- Expired
- Jul 19, 2020, 7:46 AM EDT
- In force
- 39 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Mason County, MI
The radar
The Grand Rapids radar (KGRR), 138 km from the middle of the area, began a volume at 11:11 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 00:00Z, 11.1 hours before the alert went out and 146 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 293 J/kg
- Mixed-layer CIN
- -321 J/kg
- Mixed-layer LCL
- 1478 m above ground
- 0-6 km bulk shear
- 25 kt
- 0-1 km storm-relative helicity
- 122 m²/s²
- 0-3 km storm-relative helicity
- 312 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Grand Rapids, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 19, 6:38 AM EDT, 29 minutes earlier.
Area forecast discussion, Jul 19, 6:38 AM EDT, 29 minutes before
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</html>Hazardous weather outlook, Jul 19, 3:44 AM EDT, 3 hours 23 minutes before
Hazardous Weather Outlook National Weather Service Grand Rapids MI 344 AM EDT Sun Jul 19 2020 MIZ037>040-043>046-050>052-056>059-064>067-071>074-200745- Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon- Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton- Ingham-Van Buren-Kalamazoo-Calhoun-Jackson- 344 AM EDT Sun Jul 19 2020 This hazardous weather outlook is for portions of southwest Lower Michigan. .DAY ONE...Today and Tonight Scattered thunderstorms are expected this morning, mostly near and north of I-96. It would not be out of the question to see an isolated damaging wind gust from any storm that does develop this morning. Locally heavy rain would be a more significant threat but even that would be isolated. Later this morning into mid afternoon thunderstorms should redevelop, mostly near and south of I-96 and those storms may have damaging winds and locally heavy rainfall associated with them. The greatest risk for that would be in the I-69 area. .DAYS TWO THROUGH SEVEN...Monday through Saturday A frontal wave moving through the area between Tuesday and Wednesday is expected to bring thunderstorms back to the area. Some locally heavy rainfall is possible from those storms. .SPOTTER INFORMATION STATEMENT... Spotter activation is not out the question today. LMZ844>849-200745- St Joseph to South Haven MI-South Haven to Holland MI- Holland to Grand Haven MI-Grand Haven to Whitehall MI- Whitehall to Pentwater MI-Pentwater to Manistee MI- 344 AM EDT Sun Jul 19 2020 This hazardous weather outlook is for portions of southwest Lower Michigan. .DAY ONE...Today and Tonight The wind and waves will be hazardous to both small craft and swimmers into this evening. Scattered thunderstorms are possible until midday. .DAYS TWO THROUGH SEVEN...Monday through Saturday Thunderstorms are possible from Tuesday into Wednesday. .SPOTTER INFORMATION STATEMENT... Spotter activation is not out of the question today. wdm
The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 19, 6:42 AM EDT | Special Marine Warning | GRR | 19 min | |
| Jul 19, 6:52 AM EDT | Special Marine Warning | GRR | 45 min | |
| Jul 19, 6:56 AM EDT | Special Marine Warning | GRR | 64 min | |
| Jul 19, 7:49 AM EDT | Special Marine Warning | GRR | 61 min | |
| Jul 19, 8:25 AM EDT | Severe Thunderstorm Warning | GRR | Isabella, Mecosta | 44 min |
| Jul 19, 8:54 AM EDT | Severe Thunderstorm Warning | GRR | Gratiot | 51 min |
| Jul 19, 11:44 AM EDT | Severe Thunderstorm Warning | GRR | Calhoun | 20 min |
| Jul 19, 12:03 PM EDT | Special Weather Statement | GRR | Allegan, Barry, Calhoun, Eaton, Ingham, Jackson and 2 more | 57 min |
| Jul 19, 12:58 PM EDT | Special Marine Warning | GRR | 62 min | |
| Jul 19, 1:34 PM EDT | Severe Thunderstorm Warning | GRR | Van Buren | 40 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 2020Every severe thunderstorm warning in 2020
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.