Alert archive / Minnesota / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 18, NWS Duluth, MN

May 10, 2011Itasca County, Koochiching County, Minnesota

NWS Duluth, MN issued this severe thunderstorm warning at May 10, 2011, 6:25 AM CDT for Itasca County, Koochiching County, Minnesota. It was in force for 50 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, 6:25 AM CDT (11:25 UTC)
Expired: May 10, 2011, 7:15 AM CDT
In force: 50 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Hail: 1.0 in
Wind: 50.0 mph

Counties Itasca County, MN, Koochiching County, MN

The radar

The Duluth radar (KDLH), 162 km from the middle of the area, began a volume at 11:27 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

International Fa, MN (KINL), launched 00:00Z, 11.4 hours before the alert went out and 83 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: 546 m above ground
0-6 km bulk shear: 21 kt
0-1 km storm-relative helicity: 132 m²/s²
0-3 km storm-relative helicity: 150 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 10, 4:09 AM CDT, 2 hours 16 minutes earlier.

Area forecast discussion, May 10, 4:09 AM CDT, 2 hours 16 minutes before

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Hazardous weather outlook, May 10, 5:11 AM CDT, 1 hour 14 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
511 AM CDT TUE MAY 10 2011

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-111130-
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-
511 AM CDT TUE MAY 10 2011

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

.DAY ONE...TODAY AND TONIGHT

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.

ISOLATED THUNDERSTORMS ARE POSSIBLE TODAY...INCREASING IN
COVERAGE THROUGH THE EVENING AND OVERNIGHT. A FEW STORMS COULD
BECOME SEVERE WITH LARGE HAIL AND STRONG WINDS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

THERE IS A CHANCE OF THUNDERSTORMS THROUGH 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 TODAY AND TONIGHT.

LSZ121-140>148-111130-
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-
511 AM CDT TUE MAY 10 2011

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

.DAY ONE...TODAY AND TONIGHT

ISOLATED THUNDERSTORMS WILL BE FOUND TODAY...WITH A BETTER CHANCE
FOR STORMS OVERNIGHT. A FEW STORMS MAY BECOME STRONG OR SEVERE. A
SMALL CRAFT ADVISORY HAS BEEN POSTED FOR THE NEARSHORE WATERS OF
WESTERN LAKE SUPERIOR. SEE THE LATEST MARINE PRODUCTS FOR MORE
INFORMATION. AREAS OF FOG ARE EXPECTED.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY

LOCALLY DENSE FOG MAY PERSIST INTO WEDNESDAY. A CHANCE OF
THUNDERSTORMS WILL CONTINUE ACROSS THE NEARSHORE WATERS OF WESTERN
LAKE SUPERIOR THROUGH WEDNESDAY EVENING.

GRANING

MORE INFORMATION MAY BE OBTAINED AT THE FOLLOWING WEB ADDRESS:
HTTP://WWW.WEATHER.GOV/DULUTH

In the hours before

Special weather statement, May 10, 4:50 AM CDT, 1 hour 35 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
450 AM CDT TUE MAY 10 2011

MNZ034-036-101030-
CROW WING-SOUTH AITKIN-
450 AM CDT TUE MAY 10 2011

...STRONG STORMS APPROACHING MILLE LACS LAKE...

AT 446 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
STRONG THUNDERSTORMS ALONG A LINE EXTENDING FROM 10 MILES SOUTHEAST
OF FORT RIPLEY TO 10 MILES NORTH OF MILACA...MOVING NORTH ALONG US
HIGHWAY 169...AT 20 MPH.

THESE STORMS ARE CAPABLE OF PRODUCING UP TO NICKEL SIZE HAIL...AND
WIND GUSTS TO 40 MPH...

LOCATIONS IMPACTED INCLUDE...
  ERSKIN LAKE...        SHEPHARD...           CAMP LAKE...
  SOUTH LONG LAKE...    MILLE LACS LAKE...    WOODROW...
  GARRISON...           PINE CENTER...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND.

LAT...LON 4648 9413 4637 9328 4615 9338 4616 9345
      4624 9345 4623 9379 4614 9381 4615 9426

GRANING

Local storm report, May 10, 5:34 AM CDT, 51 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DULUTH MN
534 AM CDT TUE MAY 10 2011

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

0529 AM     HAIL             10 E FORT RIPLEY        46.17N 94.15W
05/10/2011  M1.00 INCH       CROW WING          MN   TRAINED SPOTTER

&&

GRANING

Special weather statement, May 10, 5:41 AM CDT, 44 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
541 AM CDT TUE MAY 10 2011

MNZ010-018-025-026-101145-
KOOCHICHING-NORTH CASS-NORTH ITASCA-SOUTH ITASCA-
541 AM CDT TUE MAY 10 2011

...STRONG STORM APPROACHING LEECH LAKE AND THE CHIPPEWA NATIONAL
FOREST...

AT 536 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM NEAR BAGLEY...OR 30 MILES WEST OF CASS
LAKE...MOVING NORTHEAST AT 30 MPH.

THIS STORM IS CAPABLE OF PRODUCING UP TO NICKEL SIZE HAIL...AND WIND
GUSTS TO 40 MPH...

LOCATIONS IMPACTED INCLUDE...
  TOWN OF CASS LAKE...  CASS LAKE...          SCHLEY...
  PORTAGE LAKE...       SUGAR LAKE...         ROSY...
  ALVWOOD...

GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW
AROUND. IF OUTDOORS...SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS
STORM HAS PASSED.

LAT...LON 4742 9467 4742 9443 4790 9443 4798 9413
      4736 9397 4732 9468 4741 9468

GRANING

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, 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
May 10, 6:48 PM CDT	Severe Thunderstorm Warning	DLH	Cass, Crow Wing	42 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.