Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 9, NWS Duluth, MN

May 25, 2008Ashland County, Iron County, Wisconsin

NWS Duluth, MN issued this severe thunderstorm warning at May 25, 2008, 2:08 PM CDT for Ashland County, Iron County, Wisconsin. It was in force for 67 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: May 25, 2008, 2:08 PM CDT (19:08 UTC)
Expired: May 25, 2008, 3:15 PM CDT
In force: 67 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon

Counties Ashland County, WI, Iron County, WI

The radar

The Duluth radar (KDLH), 139 km from the middle of the area, began a volume at 19:11 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 12:00Z, 7.1 hours before the alert went out and 285 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1525 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

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 May 25, 11:02 AM CDT, 3 hours 6 minutes earlier.

Area forecast discussion, May 25, 11:02 AM CDT, 3 hours 6 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DULUTH MN
1102 AM CDT SUN MAY 25 2008

.UPDATE...

.DISCUSSION...

UPDATED TO REFLECT ONGOING CONVECTION MOVING NEWRD THROUGH
AITKIN/PINE COUNTIES ATTM...SHOULD MOVE THRU CARLTON/ SRN ST. LOUIS
THIS MORNING. ALSO UPDATED FOR CLEAR SLOT IN THE FAR NORTH.

NO OTHER CHANGES....EXPECT MORE CONVECTINO TO FIRE EARLY THIS
AFT AHEAD OF WRN TROF AND ALONG NRN MN WARM FRONT.

&&

.AVIATION...

&&

.PREV DISCUSSION... /ISSUED 438 AM CDT SUN MAY 25 2008/

DISCUSSION...LATEST RADAR IMAGERY SHOWS A BAND OF SHOWERS AND
THUNDERSTORMS EXTENDING FROM THE ARROWHEAD SOUTH ACROSS LAKE
SUPERIOR AND OVER NORTH CENTRAL WISCONSIN. THIS PRECIP IS
ASSOCIATED WITH AN UPPER LEVEL SHORTWAVE PROPAGATING EWD ACROSS
OUR FCST AREA...AND SHOULD EXIT TO THE EAST OF THE CWA ALONG WITH
THE PRECIPITATION EARLY THIS MORNING.

THE MAIN FORECAST CONCERN FOR THE SHORT TERM WILL THE SHIFT TO AN
APPROACHING LOW PRESSURE SYSTEM FROM THE WEST. THIS LOW AND
TRAILING OCCLUDED/COLD/WARM FRONT WILL GRADUALLY TRACK ACROSS THE
UPPER MIDWEST TODAY AND TONIGHT...PRODUCING SCATTERED SHOWERS AND
THUNDERSTORMS ACROSS MUCH OF THE REGION. DEW POINTS HAVE ALREADY
INCREASED INTO THE LOWER 50S ACROSS OUR SWRN ZONES...AND SHOULD
CONTINUE TO RISE ACROSS THE ENTIRE CWA TODAY AS WINDS BECOME MORE
SOUTHERLY AND STRENGTHEN...ADVECTING MOISTURE NORTH ACROSS THE
FCST AREA. WITH PARTIAL CLEARING ALREADY OCCURRING ACROSS WRN
MN...INCREASED SENSIBLE HEATING WILL COMBINE WITH THE SOUTHERLY
FLOW/WAA TO PRODUCE TEMPS IN THE 70S ACROSS OUR WRN AND SRN ZONES
BY THIS AFTERNOON. CLOSER TO THE LAKE...TEMPS WILL BE SOMEWHAT
COOLER...ESPECIALLY RIGHT ALONG THE LAKESHORE WHERE A STUBBORN
MARINE LAYER WILL LINGER.

IN ANY EVENT...WITH THE MOISTURE AND WARMTH...THE ATMOSPHERE IS
EXPECTED TO DESTABILIZE ACROSS MOST OF THE UPPER MIDWEST
TODAY...WITH MUCAPE VALUES MAXING OUT BETWEEN 1500 AND 3000 J/KG
ACROSS THE NORTHLAND ALONE. THE LOW AND TRAILING TROUGH/FRONT WILL
BE THE FOCUS FOR THUNDERSTORM DEVELOPMENT THIS AFTERNOON AND
EVENING. ONCE THUNDERSTORMS GET GOING...THE STRONG VERTICAL WIND
SHEAR WILL CAUSE THE STORMS TO BECOME MORE ORGANIZED...POSSIBLE
INTO AN MCS. THE THREAT FOR SEVERE SEVERE WEATHER IS OUTLINED WELL
IN SWODY1...WITH HIGHEST PROBABILITY SOUTH OF THE TWIN PORTS
ACROSS EC MN AND NWRN WI. BECAUSE OF THE STRONG LOW-LEVEL SHEAR
AND MODERATE TO STRONG SFC BASED INSTABILITY...THERE WILL ALSO BE
A RISK OF SUPERCELLS AND TORNADOES IN THIS AREA...AGAIN MAINLY
THIS AFTERNOON AND EVENING. HOWEVER THE MAIN SEVERE WEATHER THREAT
ACROSS THE FCST AREA WILL BE LARGE HAIL AND DAMAGING WINDS. THE
CONVECTION SHOULD EVOLVE INTO A SQUALL LINE ALONG THE FRONT THIS
EVENING...AND PROPAGATE EAST OF OUR CWA AFTER MIDNIGHT.

A SECONDARY COLD FRONT OVER SRN CANADA IS THEN PROGGED TO DROP
SOUTH ACROSS OUR FCST AREA ON MONDAY...BRINGING COOLER CONDITIONS
AND A CHANCE OF SHOWERS. HIGH PRESSURE AND DRIER AIR WILL MOVE OVER
THE NORTHLAND BEHIND THE FRONT MONDAY NIGHT...CAUSING SKIES TO
CLEAR OUT. LIGHTER WINDS AND CLEARING SKIES WILL LEAD TO STRONG
RADIATIONAL COOLING WITH LOW TEMPS RANGING FROM THE UPPER 20S TO
MID 30S. THEREFORE WILL MENTION FROST IN THE FORECAST FOR NOT ONLY
MONDAY NIGHT...BUT ALSO TUESDAY NIGHT WHEN SIMILAR CONDITIONS ARE
EXPECTED.

AVIATION...SCATTERED THUNDERSTORMS MOVED THROUGH OVERNIGHT...
BRINGING AREAS OF MVFR CIGS AND VSBYS. WIDESPREAD LLWS WILL ALSO
OCCUR FOR A TIME THIS MORNING...BEFORE THE LOW LEVEL JET WEAKENS
AND  LESSENS THE LLWS FACTOR DURING THE DAY. A FEW SCATTERED
SHOWERS AND THUNDERSTORMS ARE STILL POSSIBLE ACROSS THE AREA THIS
MORNING...BUT THE MAIN STORY WILL BE THE POTENTIAL FOR SEVERE
WEATHER THIS AFTERNOON. SUPERCELL THUNDERSTORMS WILL BE POSSIBLE
AT SOME POINT THIS AFTERNOON AND EVENING...WITH THE POTENTIAL FOR
TORNADOES... DAMAGING WINDS AND VERY LARGE HAIL. IT WILL ALSO
BRING LLWS... ESPECIALLY TO EASTERN AREAS. THE BEST CHANCE FOR THE
SUPERCELL THUNDERSTORMS WILL BE FROM THE ARROWHEAD...INTO THE TWIN
PORTS...THE UPPER SAINT CROIX RIVER VALLEY AND NW WI. THE STORMS
WILL ALSO BRING LOCAL IFR/LIFR CIGS/VSBYS THROUGH TONIGHT.

&&

POINT TEMPS/POPS...
DLH  69  48  58  33 /  60  50  30  10
INL  74  44  55  29 /  50  50  40  10
BRD  78  50  60  36 /  40  30  20  10
HYR  74  51  64  32 /  60  50  30  10
ASX  73  49  59  32 /  60  50  30  10

&&

.DLH WATCHES/WARNINGS/ADVISORIES...

MN...NONE.
WI...NONE.
LS...NONE.

CLC

Hazardous weather outlook, May 25, 11:49 AM CDT, 2 hours 19 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DULUTH MN
1149 AM CDT SUN MAY 25 2008

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-261700-
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-
1149 AM CDT SUN MAY 25 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST MINNESOTA AND
NORTHWEST WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS ARE LIKELY THIS
AFTERNOON AND EVENING. TORNADOES ARE ALSO POSSIBLE. THIS IS A VERY
VOLATILE SITUATION AND EVERYONE SHOULD CLOSELY MONITOR THE WEATHER
VIA YOUR FAVORITE SOURCE OF WEATHER...OR KEEP YOUR ALL HAZARD
WEATHER RADIO IN ALERT MODE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE IS A CHANCE OF THUNDERSTORMS THURSDAY NIGHT THROUGH SATURDAY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION MAY BE NEEDED TODAY AND TONIGHT.

LSZ121-140>148-261700-
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-
1149 AM CDT SUN MAY 25 2008

THIS HAZARDOUS WEATHER OUTLOOK IS FOR THE NEARSHORE WATERS OF
WESTERN LAKE SUPERIOR.

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS ARE LIKELY THIS
AFTERNOON AND EVENING. TORNADOES ARE ALSO POSSIBLE. THIS IS A VERY
VOLATILE SITUATION AND EVERYONE SHOULD CLOSELY MONITOR THE WEATHER
VIA YOUR FAVORITE SOURCE OF WEATHER...OR KEEP YOUR ALL HAZARD
WEATHER RADIO IN ALERT MODE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THUNDERSTORMS WITH LARGE HAIL AND DAMAGING WINDS ARE LIKELY THIS
AFTERNOON AND EVENING. TORNADOES ARE ALSO POSSIBLE. THIS IS A VERY
VOLATILE SITUATION AND EVERYONE SHOULD CLOSELY MONITOR THE WEATHER
VIA YOUR FAVORITE SOURCE OF WEATHER...OR KEEP YOUR ALL HAZARD
WEATHER RADIO IN ALERT MODE.

CLC

In the hours before

Local storm report, May 25, 12:00 PM CDT, 2 hours 8 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
1200 PM CDT SUN MAY 25 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

1159 AM     HAIL             4 S GRANTSBURG          45.72N 92.68W
05/25/2008  M0.75 INCH       BURNETT            WI   AMATEUR RADIO

&&

CCHRIST

Local storm report, May 25, 1:03 PM CDT, 1 hour 5 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
103 PM CDT SUN MAY 25 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0100 PM     HAIL             1 N SPOONER             45.84N 91.89W
05/25/2008  E0.88 INCH       WASHBURN           WI   TRAINED SPOTTER

            NICKEL-SIZED HAIL.

0100 PM     HAIL             SPOONER                 45.82N 91.89W
05/25/2008  M0.88 INCH       WASHBURN           WI   TRAINED SPOTTER

&&

BETTWY

Local storm report, May 25, 1:37 PM CDT, 31 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
137 PM CDT SUN MAY 25 2008

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0136 PM     HAIL             8 E HAYWARD             46.01N 91.31W
05/25/2008  M0.75 INCH       SAWYER             WI   AMATEUR RADIO

&&

CCHRIST

The office that day

Everything else NWS Duluth, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 25, 11:08 AM CDT	Severe Thunderstorm Warning	DLH	Pine	67 min
May 25, 4:24 PM CDT	Severe Thunderstorm Warning	DLH	Koochiching	66 min
May 25, 4:42 PM CDT	Severe Thunderstorm Warning	DLH	Koochiching	13 min
May 25, 4:55 PM CDT	Severe Thunderstorm Warning	DLH	Itasca	19 min
May 25, 5:20 PM CDT	Severe Thunderstorm Warning	DLH	Koochiching	55 min
May 25, 5:25 PM CDT	Severe Thunderstorm Warning	DLH	Cass	50 min
May 25, 5:52 PM CDT	Tornado Warning	DLH	Cass	23 min
May 25, 6:08 PM CDT	Severe Thunderstorm Warning	DLH	Koochiching	67 min
May 25, 6:11 PM CDT	Tornado Warning	DLH	Cass, Itasca	41 min
May 25, 6:17 PM CDT	Severe Thunderstorm Warning	DLH	Itasca, Saint Louis	31 min
May 25, 6:51 PM CDT	Severe Thunderstorm Warning	DLH	Koochiching	24 min
May 25, 12:12 PM CDT	Severe Thunderstorm Warning	DLH	Burnett, Washburn	33 min
May 25, 12:38 PM CDT	Severe Thunderstorm Warning	DLH	Burnett, Sawyer, Washburn	52 min
May 25, 1:25 PM CDT	Severe Thunderstorm Warning	DLH	Ashland, Sawyer	50 min
May 25, 2:50 PM CDT	Severe Thunderstorm Warning	DLH	Iron	25 min
May 25, 3:19 PM CDT	Severe Thunderstorm Warning	DLH	Iron, Price	29 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2008 Every severe thunderstorm warning in 2008

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.