Alert archive / Michigan / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 4, NWS Detroit, MI
NWS Detroit, MI issued this severe thunderstorm warning at Apr 25, 2009, 2:04 PM EDT for Lapeer County, Macomb County, Michigan. It was in force for 56 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
- Apr 25, 2009, 2:04 PM EDT (18:04 UTC)
- Expired
- Apr 25, 2009, 3:00 PM EDT
- In force
- 56 min
- Issued by
- NWS Detroit, MI
- Area
- Storm-based polygon
Counties Lapeer County, MI, Macomb County, MI
The radar
The Detroit radar (KDTX), 39 km from the middle of the area, began a volume at 18:04 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 |
|---|---|---|---|
| Apr 25, 10:44 AM EDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Detroit, MI (KDTX), launched 12:00Z, 6.1 hours before the alert went out and 35 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
- 1402 m above ground
- 0-6 km bulk shear
- 34 kt
- 0-1 km storm-relative helicity
- 221 m²/s²
- 0-3 km storm-relative helicity
- 222 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 Apr 25, 1:55 PM EDT, 9 minutes earlier.
Area forecast discussion, Apr 25, 1:55 PM EDT, 9 minutes before
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</html>Hazardous weather outlook, Apr 25, 4:17 AM EDT, 9 hours 47 minutes before
HAZARDOUS WEATHER OUTLOOK...CORRECTED NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI 417 AM EDT SAT APR 25 2009 CORRECTED TO ADD SPOTTER INFORMATION STATEMENT MIZ047>049-053>055-060>063-068>070-075-076-082-083-260900- MIDLAND-BAY-HURON-SAGINAW-TUSCOLA-SANILAC-SHIAWASSEE-GENESEE-LAPEER- ST. CLAIR-LIVINGSTON-OAKLAND-MACOMB-WASHTENAW-WAYNE-LENAWEE-MONROE- 417 AM EDT SAT APR 25 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR ALL OF SOUTHEAST MICHIGAN. .DAY ONE...TODAY AND TONIGHT THERE IS A CHANCE OF THUNDERSTORMS TODAY AND TONIGHT ACROSS ALL OF SOUTHEAST MICHIGAN AS A COLD FRONT DROPS SOUTHWARD THEN STALLS OVERNIGHT. THERE IS A SLIGHT RISK SOME OF THESE THUNDERSTORMS MAY BECOME SEVERE TODAY AND THIS EVENING. THE PRIMARY THREAT FROM THESE THUNDERSTORMS WILL BE HAIL UP TO ONE INCH IN DIAMETER AND DAMAGING WIND GUSTS TO 60 MPH. STORM MOTION WILL BE TO THE EAST NORTHEAST AT AROUND 40 MPH. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY CHANCES FOR THUNDERSTORMS WILL CONTINUE ACROSS SOUTHEAST MICHIGAN SUNDAY THROUGH TUESDAY AS SEVERAL FRONTAL BOUNDARIES DROP SLOWLY ACROSS THE GREAT LAKES. AFTER A BREAK ON WEDNESDAY...THUNDERSTORMS WILL AGAIN BE POSSIBLE THURSDAY AND FRIDAY. .SPOTTER INFORMATION STATEMENT...DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGER IMMEDIATELY. SPOTTER ACTIVATION MAY BE NEEDED TODAY AND THIS EVENING. LCZ422-423-460-LEZ444-LHZ361>363-421-422-441>443-462>464-260900- 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- 417 AM EDT SAT APR 25 2009 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 OF THUNDERSTORMS TODAY AND TONIGHT ACROSS ALL MARINE AREAS AS A COLD FRONT DROPS SOUTHWARD THEN STALLS OVERNIGHT. THERE IS A SLIGHT RISK SOME OF THESE THUNDERSTORMS MAY BECOME SEVERE TODAY AND THIS EVENING. THE PRIMARY THREAT FROM THESE THUNDERSTORMS WILL BE HAIL UP TO ONE INCH IN DIAMETER AND DAMAGING WIND GUSTS TO 55 KNOTS. STORM MOTION WILL BE TO THE EAST NORTHEAST AT 40 KNOTS. SMALL CRAFT ADVISORIES ALSO REMAIN IN EFFECT FOR ALL NEARSHORE WATERS. PLEASE REFER TO THE LATEST MARINE PRODUCTS /MWWDTX...GLFSC...NSHDTX/ FOR DETAILS AND EXPIRATION TIMES. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY CHANCES FOR THUNDERSTORMS WILL CONTINUE ACROSS SOUTHEAST MICHIGAN SUNDAY THROUGH TUESDAY AS SEVERAL FRONTAL BOUNDARIES DROP SLOWLY ACROSS THE GREAT LAKES. AFTER A BREAK ON WEDNESDAY...THUNDERSTORMS WILL AGAIN BE POSSIBLE THURSDAY AND FRIDAY. WINDS WILL INCREASE FROM THE SOUTH ON MONDAY AHEAD OF AN APPROACHING COLD FRONT. SMALL CRAFT ADVISORIES MAY BE NEEDED. .SPOTTER INFORMATION STATEMENT...DISPATCHERS...PLEASE NOTIFY YOUR EMERGENCY MANAGER IMMEDIATELY. SPOTTER ACTIVATION MAY BE NEEDED TODAY AND THIS EVENING. HLO YOU CAN OBTAIN YOUR LATEST NATIONAL WEATHER SERVICE FORECASTS ONLINE AT WWW.WEATHER.GOV/DETROIT (ALL LOWER CASE).
In the hours before
Local storm report, Apr 25, 1:31 PM EDT, 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DETROIT/PONTIAC MI
131 PM EDT SAT APR 25 2009
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0130 PM TSTM WND GST 5 NW CHELSEA 42.37N 84.09W
04/25/2009 E58 MPH WASHTENAW MI TRAINED SPOTTER
&&
DEEDLERLocal storm report, Apr 25, 1:42 PM EDT, 22 minutes before
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</html>Local storm report, Apr 25, 1:47 PM EDT, 17 minutes before
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</html>Special weather statement, Apr 25, 1:49 PM EDT, 15 minutes before
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</html>Local storm report, Apr 25, 1:59 PM EDT, 5 minutes before
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</html>Local storm report, Apr 25, 2:04 PM EDT, 0 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 |
|---|---|---|---|---|
| Apr 25, 1:03 PM EDT | Special Marine Warning | DTX | 103 min | |
| Apr 25, 1:15 PM EDT | Severe Thunderstorm Warning | DTX | Lenawee, Livingston, Washtenaw | 60 min |
| Apr 25, 1:37 PM EDT | Severe Thunderstorm Warning | DTX | Oakland, Washtenaw, Wayne | 53 min |
| Apr 25, 1:42 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Shiawassee | 50 min |
| Apr 25, 2:21 PM EDT | Severe Thunderstorm Warning | DTX | Saint Clair | 54 min |
| Apr 25, 2:23 PM EDT | Special Marine Warning | DTX | 58 min | |
| Apr 25, 2:28 PM EDT | Severe Thunderstorm Warning | DTX | Sanilac | 47 min |
| Apr 25, 2:57 PM EDT | Severe Thunderstorm Warning | DTX | Midland, Saginaw | 28 min |
| Apr 25, 5:27 PM EDT | Severe Thunderstorm Warning | DTX | Livingston, Shiawassee, Washtenaw | 93 min |
| Apr 25, 5:59 PM EDT | Severe Thunderstorm Warning | DTX | Genesee, Oakland | 68 min |
| Apr 25, 6:21 PM EDT | Severe Thunderstorm Warning | DTX | Wayne | 71 min |
| Apr 25, 6:22 PM EDT | Special Marine Warning | DTX | 85 min | |
| Apr 25, 7:04 PM EDT | Severe Thunderstorm Warning | DTX | Macomb, Saint Clair | 41 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.