Alert archive / Michigan / Severe Thunderstorm Warnings in 2020
Severe Thunderstorm Warning 63, NWS Grand Rapids, MI
NWS Grand Rapids, MI issued this severe thunderstorm warning at Aug 26, 2020, 4:09 AM EDT for Mason County, Oceana County, Michigan. It was in force for 66 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
- Aug 26, 2020, 4:09 AM EDT (08:09 UTC)
- Expired
- Aug 26, 2020, 5:15 AM EDT
- In force
- 66 min
- Issued by
- NWS Grand Rapids, MI
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Mason County, MI, Oceana County, MI
The radar
The Grand Rapids radar (KGRR), 123 km from the middle of the area, began a volume at 08:10 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, 8.2 hours before the alert went out and 156 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1794 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 5 m²/s²
- 0-3 km storm-relative helicity
- 196 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 Aug 26, 3:22 AM EDT, 47 minutes earlier.
Area forecast discussion, Aug 26, 3:22 AM EDT, 47 minutes before
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</html>Hazardous weather outlook, Aug 25, 9:35 PM EDT, 6 hours 34 minutes before
Hazardous Weather Outlook National Weather Service Grand Rapids MI 935 PM EDT Tue Aug 25 2020 MIZ037>040-043>046-050>052-056>059-064>067-071>074-262015- Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon- Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton- Ingham-Van Buren-Kalamazoo-Calhoun-Jackson- 935 PM EDT Tue Aug 25 2020 This hazardous weather outlook is for portions of southwest Lower Michigan. .DAY ONE...Tonight Thunderstorms are expected to develop over Southwest Lower Michigan overnight and continue through Wednesday morning. The main threats from storms tonight will be locally heavy rainfall and lightning. Some of the stronger storms may contain wind gusts to in excess of 40 mph. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Thunderstorms will likely continue into Wednesday morning. The main threat will remain locally heavy rainfall. Rounds of thunderstorms are then expected from Thursday through Friday night. There is a risk for severe weather and heavy rainfall with each round of storms. Localized flooding is possible, especially late Thursday night through Friday night. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected. LMZ844>849-262015- 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- 935 PM EDT Tue Aug 25 2020 This hazardous weather outlook is for portions of southwest Lower Michigan. .DAY ONE...This Afternoon and Tonight Scattered thunderstorms will develop over Lake Michigan overnight and continue into Wednesday morning. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Thunderstorms are likely into Wednesday morning with lightning being the main threat to boaters. Rounds of thunderstorms are then expected from Thursday through Friday night. There is a risk for severe weather and heavy rainfall with each round of storms. Conditions may become hazardous to both swimmers and boaters from Wednesday evening through early Thursday afternoon. .SPOTTER INFORMATION STATEMENT... Spotter activation is not expected. DUKE
The office that day
Everything else NWS Grand Rapids, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 3:20 AM EDT | Beach Hazards Statement | GRR | Allegan, Mason, Muskegon, Oceana, Ottawa, Van Buren | 34 hr |
| Aug 26, 3:20 AM EDT | Special Marine Warning | GRR | 85 min | |
| Aug 26, 4:11 AM EDT | Special Marine Warning | GRR | 49 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.