Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 9, NWS Duluth, MN
NWS Duluth, MN issued this severe thunderstorm warning at Apr 24, 2009, 7:09 PM CDT for Iron County, Price County, Wisconsin. 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
- Apr 24, 2009, 7:09 PM CDT (00:09 UTC)
- Expired
- Apr 24, 2009, 8:15 PM CDT
- In force
- 66 min
- Issued by
- NWS Duluth, MN
- Area
- Storm-based polygon
Counties Iron County, WI, Price County, WI
The radar
The Duluth radar (KDLH), 173 km from the middle of the area, began a volume at 00:11 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Apr 24, 4:45 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.2 hours before the alert went out and 242 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
- 979 J/kg
- Mixed-layer CIN
- -155 J/kg
- Mixed-layer LCL
- 1986 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 228 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.7
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 Duluth, MN wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 24, 5:58 PM CDT, 1 hour 11 minutes earlier.
Area forecast discussion, Apr 24, 5:58 PM CDT, 1 hour 11 minutes before
AREA FORECAST DISCUSSION...MESOSCALE UPDATE NATIONAL WEATHER SERVICE DULUTH MN 558 PM CDT FRI APR 24 2009 .MESOSCALE UPDATE CONCERNING SEVERE THUNDERSTORM POTENTIAL ACROSS NORTHWEST WISCONSIN... AS OF 430 PM CDT...SFC COLD FRONT AND ZONE OF MAXIMIZED BOUNDARY LAYER CONVERGENCE APPEARS TO LIE FROM SOUTHERN SAWYER COUNTY EAST-NORTHEASTWARD TO EXTREME NORTHWEST PHILLIPS COUNTY TO FAR SOUTHERN IRON COUNTY..NEAR MERCER. LATEST SHORT TERM MODEL GUIDANCE CONTINUES TO INSIST THAT DEEP CONVECTION WILL DEVELOP OVER THE NEXT 1-2 HOURS ALONG AND JUST SOUTHEAST OF THIS AXIS. GIVEN AMBIENT ENVIRONMENT OF 1500-2000 J/KG OF MOST UNSTABLE CAPE AND DEEP LAYER SHEAR OF 40-50 KTS..ANY STORMS THAT DEVELOP MAY BECOME SEVERE. THE PRIMARY THREAT IS EXPECTED TO BE 1 TO 1.5 INCH HAIL WITH THE STRONGEST STORMS GIVEN RELATIVELY LOW AMBIENT FREEZING LEVELS OF 10-11 KFT AGL. ANY STORMS WITH 50+ DBZ CORE TO AROUND 25-28 KFT AGL WILL LIKELY WARRANT SVR TSTORM WARNINGS. THERE IS ALSO A LESSER THREAT OF DAMAGING WINDS..GIVEN 20-25 DEGREE TEMP/DEWPOINT SPREADS AND DEEPLY MIXED BOUNDARY LAYER WITH NEAR DRY ADIABATIC LAPSE RATES ALONG AND SOUTHEAST OF THE SFC FRONTAL ZONE. FARTHER TO THE NORTHWEST..NARROW ZONE OF RATHER INTENSE LOW LEVEL FRONTOGENESIS EXISTS WITHIN THE 950-800 MB LAYER IN AREAS FROM SIREN NEWD TO THE APOSTLE ISLANDS. THERE IS SOME POTENTIAL FOR SLIGHTLY ELEVATED STRONG TO MARGINALLY SEVERE STORMS TO DEVELOP SLIGHTLY BEHIND THE FRONT AS WELL..AGAIN WITH A PRIMARY THREAT OF LARGE HAIL. MILLER
Hazardous weather outlook, Apr 24, 3:34 PM CDT, 3 hours 35 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE DULUTH MN 334 PM CDT FRI APR 24 2009 MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-251030- KOOCHICHING-NORTHERN ST. LOUIS-NORTHERN COOK/NORTHERN LAKE- NORTHERN ITASCA-CENTRAL ST. LOUIS-SOUTHERN LAKE/LAKESHORE- SOUTHERN COOK/LAKESHORE-NORTHERN CASS-SOUTHERN ITASCA- SOUTHERN CASS-CROW WING-NORTHERN AITKIN-SOUTHERN AITKIN- CARLTON/SOUTHERN ST. LOUIS-PINE-DOUGLAS-BAYFIELD-ASHLAND-IRON- BURNETT-WASHBURN-SAWYER-PRICE- 334 PM CDT FRI APR 24 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MINNESOTA AND NORTHWEST WISCONSIN. .DAY ONE...THIS AFTERNOON AND TONIGHT THUNDERSTORMS WILL BE POSSIBLE OVER FAR EASTERN MINNESOTA AND ALL OF NORTHWEST WISCONSIN. SOME OF THE STORMS MAY BECOME SEVERE OVER NORTHWEST WISCONSIN...MAINLY SOUTHEAST OF SHELL LAKE TO HAYWARD TO ASHLAND LINE BETWEEN 6 PM AND 10 PM. LARGE HAIL AND DAMAGING WINDS WILL BE THE MAIN THREATS. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORMS WILL AGAIN BE POSSIBLE ON SUNDAY AND SUNDAY NIGHT. .SPOTTER INFORMATION STATEMENT... SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED THIS AFTERNOON OR TONIGHT. LSZ121-140>148-251030- BAYFIELD TO OAK POINT WI-GRAND PORTAGE TO GRAND MARAIS MN- GRAND MARAIS TO TACONITE HARBOR MN- TACONITE HARBOR TO SILVER BAY HARBOR MN- SILVER BAY HARBOR TO TWO HARBORS MN-TWO HARBORS TO DULUTH MN- DULUTH MN TO PORT WING WI-PORT WING TO SAND ISLAND WI- SAND ISLAND TO BAYFIELD WI-OAK POINT TO SAXON HARBOR WI- 334 PM CDT FRI APR 24 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF WESTERN LAKE SUPERIOR. .DAY ONE...THIS AFTERNOON AND TONIGHT A FEW THUNDERSTORMS WILL BE POSSIBLE OVER LAKE SUPERIOR...MAINLY THIS EVENING. .DAYS TWO THROUGH SEVEN...SATURDAY THROUGH THURSDAY THUNDERSTORMS WILL ONCE AGAIN BE POSSIBLE SUNDAY THROUGH SUNDAY NIGHT. GUSTY WINDS WILL CREATE HAZARDOUS CONDITIONS FOR SMALL CRAFT SUNDAY AND SUNDAY NIGHT...ESPECIALLY IN THE TWIN PORTS AREA. MELDE MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB ADDRESS: HTTP://WWW.WEATHER.GOV/DULUTH (ALL LOWER CASE)
In the hours before
Special weather statement, Apr 24, 5:59 PM CDT, 1 hour 10 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DULUTH MN 559 PM CDT FRI APR 24 2009 MNZ038-WIZ001-006-242315- BURNETT-DOUGLAS-PINE- 559 PM CDT FRI APR 24 2009 ...STRONG THUNDERSTORMS DEVELOPING ALONG INTERSTATE 35 IN EAST CENTRAL MINNESOTA... AT 555 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG THUNDERSTORMS DEVELOPING NEAR PINE CITY AND HINCKLEY...MOVING NORTHEAST AT 50 MPH. ONE HALF INCH DIAMETER HAIL AND WINDS UP TO 35 MPH...ARE POSSIBLE. LOCATIONS IMPACTED INCLUDE... SANDSTONE... CLOVERDALE... ASKOV... DUXBURY... MILLER
Special weather statement, Apr 24, 6:27 PM CDT, 42 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DULUTH MN 627 PM CDT FRI APR 24 2009 MNZ038-WIZ001-006-242345- BURNETT-DOUGLAS-PINE- 627 PM CDT FRI APR 24 2009 ...STRONG THUNDERSTORMS OVER EASTERN MINNESOTA AND NORTHWEST WISCONSIN... AT 624 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE STRONG THUNDERSTORMS EXTENDING FROM PINE CITY... NORTHEAST TO DUXBURY AND DAIRYLAND. STORMS WERE MOVING RAPIDLY TO THE NORTHEAST AT 55 MPH. ONE HALF INCH DIAMETER HAIL AND WINDS UP TO 40 MPH...ARE POSSIBLE. LOCATIONS IMPACTED INCLUDE... YELLOWLAKE... DUXBURY... DANBURY... KINGSDALE... CLOVERTON... RIVERSIDE... COZY CORNER... MARKVILLE... MILLER
Local storm report, Apr 24, 6:34 PM CDT, 35 minutes before
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</html>The office that day
Everything else NWS Duluth, MN issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 24, 7:37 PM CDT | Special Marine Warning | DLH | 30 min | |
| Apr 25, 3:31 PM CDT | Small Craft Advisory | DLH | 36 hr | |
| Apr 24, 7:32 PM CDT | Severe Thunderstorm Warning | DLH | Ashland, Bayfield, Iron, Sawyer | 43 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 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.