Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 22, NWS Duluth, MN

May 10, 2011Cass County, Crow Wing County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at May 10, 2011, 6:48 PM CDT for Cass County, Crow Wing County, Minnesota. It was in force for 42 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 10, 2011, 6:48 PM CDT (23:48 UTC)
Expired: May 10, 2011, 7:30 PM CDT
In force: 42 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Cass County, MN, Crow Wing County, MN

The radar

The Duluth radar (KDLH), 152 km from the middle of the area, began a volume at 23:48 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
May 10, 5:53 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.8 hours before the alert went out and 213 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: 1366 J/kg
Mixed-layer CIN: -392 J/kg
Mixed-layer LCL: 571 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.0

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 10, 6:48 PM CDT, 0 minutes earlier.

Area forecast discussion, May 10, 6:48 PM CDT, 0 minutes before

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Hazardous weather outlook, May 10, 1:32 PM CDT, 5 hours 16 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DULUTH MN
132 PM CDT TUE MAY 10 2011

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-111030-
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-
132 PM CDT TUE MAY 10 2011

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

THUNDERSTORMS WILL DEVELOP LATE THIS AFTERNOON NEAR THE BRAINERD
LAKES REGION AND EXPAND EAST TOWARDS THE TWIN PORTS THIS EVENING.
THE ATMOSPHERE WILL BE QUITE UNSTABLE INITIALLY SO SEVERE THUNDERSTORMS
ARE POSSIBLE WITH LARGE HAIL...HIGH WINDS...AND AN ISOLATED TORNADO.
ALTHOUGH THE INTENSITY OF THE STORMS IS EXPECTED TO GRADUALLY
DECREASE AS THE STORMS MOVE INTO WISCONSIN LATER TONIGHT...LARGE HAIL
AND HIGH WINDS ARE STILL POSSIBLE.

THE MISSISSIPPI RIVER IN AITKIN AND CROW WING COUNTIES REMAINS
HIGH. SOME RIVER FLOOD WARNINGS AND ADVISORIES ARE IN EFFECT FOR
THIS AREA. PLEASE SEE THE LATEST FLOOD PRODUCTS FROM THE NATIONAL
WEATHER SERVICE FOR MORE INFORMATION

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

SCATTERED THUNDERSTORMS ARE EXPECTED WEDNESDAY AND THURSDAY
ACROSS THE NORTHLAND. A FEW THUNDERSTORMS MAY BECOME SEVERE WITH
LARGE HAIL AND DAMAGING WINDS.

ADDITIONAL RAINFALL DURING THE WEEK MAY AGGRAVATE FLOODING ALONG
THE MISSISSIPPI RIVER IN AITKIN AND CROW WING COUNTIES WHERE FLOOD
WARNINGS AND ADVISORIES WILL CONTINUE. PLEASE SEE THE LATEST
FLOOD PRODUCTS FROM THE NATIONAL WEATHER SERVICE FOR MORE
INFORMATION.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION MAY BE NEEDED LATE THIS AFTERNOON AND
TONIGHT.

LSZ121-140>148-111030-
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-
132 PM CDT TUE MAY 10 2011

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

.DAY ONE...THIS AFTERNOON AND TONIGHT

BRISK NORTHEAST WINDS WILL PRODUCE HAZARDOUS CONDITIONS FOR SMALL
CRAFT THROUGH TUESDAY EVENING. A SMALL CRAFT ADVISORY HAS BEEN
ISSUED FOR THE NEARSHORE WATERS OF WESTERN LAKE SUPERIOR.SEE THE
LATEST MARINE PRODUCTS FOR MORE INFORMATION. AREAS OF FOG MAY
DEVELOP LATE TUESDAY NIGHT.

THUNDERSTORMS ARE EXPECTED LATER TONIGHT. SOME OF THE STORMS MAY
BE STRONG...PRODUCING HIGH WINDS AND HAIL.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

AREAS OF FOG...POSSIBLY DENSE... MAY PERSIST INTO EARLY THURSDAY. A
CHANCE OF THUNDERSTORMS WILL CONTINUE ACROSS THE NEARSHORE WATERS
OF WESTERN LAKE SUPERIOR WEDNESDAY AND THURSDAY.

CANNON

MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB ADDRESS:
HTTP://WWW.WEATHER.GOV/DULUTH (ALL LOWER CASE)

In the hours before

Local storm report, May 10, 2:01 PM CDT, 4 hours 47 minutes before

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Local storm report, May 10, 3:13 PM CDT, 3 hours 35 minutes before

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Local storm report, May 10, 3:38 PM CDT, 3 hours 10 minutes before

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Special weather statement, May 10, 6:37 PM CDT, 11 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
637 PM CDT TUE MAY 10 2011

MNZ033-034-110020-
CROW WING-SOUTH CASS-
637 PM CDT TUE MAY 10 2011

...STRONG THUNDERSTORM APPROACHING THE BRAINERD LAKES REGION...

AT 634 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 13 MILES SOUTHWEST OF PILLAGER...MOVING NORTHEAST
AT 40 MPH.

THIS STORM IS CAPABLE OF PRODUCING UP TO PENNY SIZE HAIL...WIND GUSTS
UP TO 40 MPH...CLOUD TO GROUND LIGHTNING AND HEAVY DOWNPOURS.

LOCATIONS IMPACTED INCLUDE...
  FORT RIPLEY...        PILLAGER...           LENNOX...
  SYLVAN...             ST. MATHIAS...        CASINO...
  EAST GULL LAKE...     BAXTER...             BARROWS...
  SOUTH LONG LAKE...    NORTH LONG LAKE...    GULL LAKE...
  LAKE SHORE...         BRAINERD...           EDWARD LAKE...

STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN
A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. IF ON AN INLAND LAKE
MOVE TO SHORE NOW.

A TORNADO WATCH REMAINS IN EFFECT UNTIL MIDNIGHT CDT.

LAT...LON 4673 9436 4648 9381 4636 9381 4615 9438
      4623 9440 4627 9435 4629 9436 4632 9443
      4629 9454 4635 9466 4634 9470 4635 9473

LAMERS

The office that day

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

Issued	Product	Office	Counties	Lasted
May 9, 10:01 PM CDT	Small Craft Advisory	DLH		24 hr
May 10, 4:50 AM CDT	Special Weather Statement	DLH	Crow Wing	40 min
May 10, 5:16 AM CDT	Severe Thunderstorm Warning	DLH	Crow Wing	59 min
May 10, 5:41 AM CDT	Special Weather Statement	DLH		64 min
May 10, 6:14 AM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Crow Wing	46 min
May 10, 6:25 AM CDT	Severe Thunderstorm Warning	DLH	Itasca, Koochiching	50 min
May 10, 7:14 AM CDT	Severe Thunderstorm Warning	DLH	Itasca, Koochiching	61 min
May 10, 7:18 AM CDT	Severe Thunderstorm Warning	DLH	Cass, Itasca	42 min
May 10, 8:12 AM CDT	Severe Thunderstorm Warning	DLH	Itasca, Koochiching	35 min
May 10, 8:23 AM CDT	Special Weather Statement	DLH	Koochiching	22 min
May 10, 8:51 AM CDT	Special Weather Statement	DLH	Koochiching	24 min
May 10, 6:37 PM CDT	Special Weather Statement	DLH	Crow Wing	43 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2011 Every severe thunderstorm warning in 2011

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.