Alert archive / Michigan / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 41, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Aug 9, 2009, 7:11 PM EDT for Livingston 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
- Aug 9, 2009, 7:11 PM EDT (23:11 UTC)
- Expired
- Aug 9, 2009, 7:50 PM EDT
- In force
- 39 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
County Livingston County, MI
The radar
The Detroit radar (KDTX), 38 km from the middle of the area, began a volume at 23:12 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 9, 5:48 PM EDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Alpena, MI (KAPX), launched 12:00Z, 11.2 hours before the alert went out and 300 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
- 1125 J/kg
- Mixed-layer CIN
- -69 J/kg
- Mixed-layer LCL
- 524 m above ground
- 0-6 km bulk shear
- 43 kt
- 0-1 km storm-relative helicity
- 50 m²/s²
- 0-3 km storm-relative helicity
- 80 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 1.9
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 Detroit, MI wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 9, 3:54 PM EDT, 3 hours 17 minutes earlier.
Area forecast discussion, Aug 9, 3:54 PM EDT, 3 hours 17 minutes before
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</html>Hazardous weather outlook, Aug 9, 1:28 PM EDT, 5 hours 43 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 128 PM EDT SUN AUG 9 2009 MIZ047>049-053>055-060>063-068>070-101000- MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-LAPEER- ST. CLAIR-LIVINGSTON-OAKLAND-MACOMB- 128 PM EDT SUN AUG 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT THERE IS A CHANCE OF THUNDERSTORMS THIS AFTERNOON AND TONIGHT AS A FRONTAL BOUNDARY MEANDERS OVER CENTRAL LOWER MICHIGAN. ADDITIONAL THUNDERSTORMS UPSTREAM ARE EXPECTED TO MOVE EAST ACROSS THE AREA THIS EVENING. THERE IS A SLIGHT CHANCE THE THUNDERSTORMS MAY BE SEVERE. LARGE HAIL...DAMAGING WIND GUSTS...AND LOCALLY HEAVY RAINFALL IN EXCESS OF ONE INCH ARE ALL POSSIBLE. THUNDERSTORM MOTION WILL BE EAST AT 35 MPH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A COLD FRONT MOVING THROUGH SOUTHEAST MICHIGAN ON MONDAY WILL LIKELY LEAD TO THUNDERSTORMS...INTO MONDAY NIGHT. THERE IS A CHANCE OF SEVERE WEATHER WITH THESE STORMS. .SPOTTER INFORMATION STATEMENT... DISPATCHERS PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. MIZ075-076-082-083-101000- WASHTENAW-WAYNE-LENAWEE-MONROE- 128 PM EDT SUN AUG 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST MICHIGAN. .DAY ONE...THIS AFTERNOON AND TONIGHT A HEAT ADVISORY REMAINS IN EFFECT. REFER TO THE LATEST URGENT WEATHER MESSAGE FOR DETAILS.../NPWDTX/. THERE IS A CHANCE OF THUNDERSTORMS THIS EVENING AND TONIGHT AS A FRONTAL BOUNDARY MEANDERS OVER CENTRAL LOWER MICHIGAN AND THUNDERSTORMS UPSTREAM MOVE ACROSS THE STATE THIS EVENING. THERE IS A SLIGHT CHANCE THE THUNDERSTORMS MAY BE SEVERE. LARGE HAIL...DAMAGING WIND GUSTS...AND LOCALLY HEAVY RAINFALL IN EXCESS OF ONE INCH ARE ALL POSSIBLE. THUNDERSTORM MOTION WILL BE EAST AT 35 MPH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A COLD FRONT MOVING THROUGH SOUTHEAST MICHIGAN ON MONDAY WILL LIKELY LEAD TO THUNDERSTORMS...INTO MONDAY NIGHT. THERE IS A CHANCE OF SEVERE WEATHER WITH THESE STORMS. .SPOTTER INFORMATION STATEMENT... DISPATCHERS PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. LCZ422-423-460-LEZ444-LHZ361>363-421-422-441>443-462>464-101000- ST. CLAIR RIVER-DETROIT RIVER-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- 128 PM EDT SUN AUG 9 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF LAKE ERIE...LAKE HURON AND LAKE ST CLAIR. .DAY ONE...THIS AFTERNOON AND TONIGHT THERE IS A CHANCE OF THUNDERSTORMS TODAY AND TONIGHT AS A FRONTAL BOUNDARY MEANDERS OVER CENTRAL LOWER MICHIGAN. THERE IS A SLIGHT CHANCE THE THUNDERSTORMS MAY BE SEVERE. LARGE HAIL...DAMAGING WIND GUSTS ARE POSSIBLE. THUNDERSTORM MOTION WILL BE EAST AT 35 MPH. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY A COLD FRONT MOVING THROUGH SOUTHEAST MICHIGAN ON MONDAY WILL LIKELY LEAD TO THUNDERSTORMS...INTO MONDAY NIGHT. THERE IS A CHANCE OF SEVERE WEATHER WITH THESE STORMS. .SPOTTER INFORMATION STATEMENT... DISPATCHERS PLEASE NOTIFY YOUR EMERGENCY MANAGERS IMMEDIATELY. SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING. MANN YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
In the hours before
Special weather statement, Aug 9, 6:53 PM EDT, 18 minutes before
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</html>Special weather statement, Aug 9, 6:55 PM EDT, 16 minutes before
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</html>The office that day
Everything else NWS Detroit, MI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 1:40 AM EDT | Severe Thunderstorm Warning | DTX | Saginaw, Shiawassee | 27 min |
| Aug 9, 1:45 AM EDT | Severe Thunderstorm Warning | DTX | Lapeer, Macomb, Oakland, Saint Clair | 50 min |
| Aug 9, 2:05 AM EDT | Areal Flood Advisory | DTX | Genesee, Lapeer, Macomb, Oakland, Saint Clair | 3 hr |
| Aug 9, 2:47 AM EDT | Flash Flood Warning | DTX | Genesee, Lapeer | 3 hr |
| Aug 9, 4:11 AM EDT | Heat Advisory | DTX | Lenawee, Monroe, Washtenaw, Wayne | 18 hr |
| Aug 9, 5:43 AM EDT | Areal Flood Warning | DTX | Lapeer | 10 hr |
| Aug 9, 7:33 PM EDT | Severe Thunderstorm Warning | DTX | Oakland | 72 min |
Nearby
Severe Thunderstorm Warnings in Michigan, 2009Every severe thunderstorm warning in 2009
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.