Alert archive / Minnesota / Flash Flood Warnings in 2010

Flash Flood Warning 1, NWS Duluth, MN

May 23, 20104 counties in Minnesota

NWS Duluth, MN issued this flash flood warning at May 23, 2010, 11:35 PM CDT for 4 counties in Minnesota. It was in force for 5 hr. 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 23, 2010, 11:35 PM CDT (04:35 UTC)
Expired: May 24, 2010, 4:31 AM CDT
In force: 5 hr
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Flood severity: None

Counties Carlton County, MN, Lake County, MN, Pine County, MN, Saint Louis County, MN

The radar

The Duluth radar (KDLH), 16 km from the middle of the area, began a volume at 04:37 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, 4.6 hours before the alert went out and 194 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: 2491 m above ground
0-6 km bulk shear: 59 kt
0-1 km storm-relative helicity: 57 m²/s²
0-3 km storm-relative helicity: 151 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 flash flood 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 flash flood warning went out at May 23, 11:11 PM CDT, 24 minutes earlier.

Area forecast discussion, May 23, 11:11 PM CDT, 24 minutes before

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Hazardous weather outlook, May 23, 8:50 PM CDT, 2 hours 45 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DULUTH MN
850 PM CDT SUN MAY 23 2010

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-241030-
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-
850 PM CDT SUN MAY 23 2010

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

.DAY ONE...TONIGHT

SCATTERED STRONG TO SEVERE THUNDERSTORMS WILL BE POSSIBLE THROUGH
THE REST OF THE EVENING IN MINNESOTA...ROUGHLY ALONG AND EAST OF A LINE
FROM BRAINERD TO HIBBING TO CRANE LAKE...AND INCLUDING THE TWIN
PORTS...IRON RANGE...ARROWHEAD...AND HINCKLEY AREAS. THE MAIN
THREATS WILL BE LARGE HAIL...HEAVY RAIN...AND STRONG WINDS. STORMS
HAVE BEEN MOVING OVER THE SAME AREAS FROM AROUND MILLE LACS
LAKE...NORTHEAST THROUGH PORTIONS OF CARLTON...AND SOUTHERN AND
CENTRAL SAINT LOUIS COUNTIES. THERE IS A HIGHER RISK FOR
ADDITIONAL HEAVY RAIN IN THIS AREA...AS ADDITIONAL STORMS MOVE
THROUGH FOR THE REST OF THE EVENING.

THE THREAT FOR STRONG STORMS OVER NORTHWEST WISCONSIN IS
LOWER...AND PERHAPS AN ISOLATED THUNDERSTORM WILL OCCUR THERE. THE
MAIN THREATS WITH THE THUNDERSTORMS WILL BE LARGE HAIL...DAMAGING
WINDS...AND HEAVY RAIN.

THE THREAT FOR MORE STRONG TO SEVERE STORMS WILL CONTINUE
OVERNIGHT...AND GRADUALLY SHIFT A BIT FURTHER TO THE WEST AND
NORTH...TOWARD GRAND RAPIDS...THE BRAINERD
LAKES...WALKER...LEADER...AND PINE RIVER AREAS. THE MAIN THREATS
WILL BE LARGE HAIL...HEAVY RAIN...AND GUSTY WINDS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE IS A CHANCE OF THUNDERSTORMS MONDAY THROUGH WEDNESDAY. SOME
STORMS MAY BE STRONG OR SEVERE.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED TONIGHT.

LSZ121-140>148-241030-
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-
850 PM CDT SUN MAY 23 2010

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

.DAY ONE...TONIGHT

A FEW STRONG TO SEVERE STORMS PRODUCING GUSTY WINDS TO 50
MPH...LARGE HAIL AND FREQUENT LIGHTNING...WILL BE POSSIBLE FROM
THE TWIN PORTS NORTHEAST TO GRAND PORTAGE. ANY THUNDERSTORMS WILL
BE MORE ISOLATED OVER THE REST OF THE SOUTH SHORE.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THERE IS A CHANCE OF THUNDERSTORMS MONDAY THROUGH WEDNESDAY.

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, May 23, 9:47 PM CDT, 1 hour 48 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE DULUTH MN
947 PM CDT SUN MAY 23 2010

MNZ012-019-020-037-240300-
CARLTON/SOUTH ST. LOUIS-CENTRAL ST. LOUIS-NORTHERN COOK/NORTHERN
LAKE-SOUTHERN LAKE/NORTH SHORE-
947 PM CDT SUN MAY 23 2010

...STRONG THUNDERSTORMS AND HEAVY RAIN TO CONTINUE FROM CLOQUET TO
THE NORTH SHORE...

AT 946 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SEVERAL STRONG THUNDERSTORMS NEAR MAHTOWA... TO DULUTH... ISLAND
LAKE... AND NORTHEASTWARD ALONG THE NORTH SHORE OF LAKE SUPERIOR
FROM TWO HARBORS TO JUST WEST OF SILVER BAY.  STORMS WERE MOVING
NORTHEAST AT AROUND 20 MPH AND WERE MOVING OVER THE SAME AREAS AS
PREVIOUS STORMS.

HALF INCH DIAMETER HAIL...WIND GUSTS UP TO 30 MPH...FREQUENT CLOUD
TO GROUND LIGHTNING... AND PERIODS OF TORRENTIAL DOWNPOURS CAN BE
EXPECTED.

LOCATIONS IMPACTED INCLUDE...
  CLOQUET...
  DULUTH...
  ISLAND LAKE...
  BOULDER LAKE...
  ALGER...
  BRIMSON...

HEAVY RAIN MAY CAUSE RAPID RISES ON THE RIVERS ALONG THE NORTH SHORE
FROM DULUTH... TO TWO HARBORS... SILVER BAY AND TOFTE EVEN THOUGH IT
MAY NOT BE RAINING ALONG THE IMMEDIATE LAKE SHORE.  PEOPLE IN
CAMPGROUNDS NEAR RIVER SHOULD BE ALERT FOR RAPIDLY RISING WATERS.

LAT...LON 4651 9251 4663 9298 4762 9142 4743 9108
      4737 9113

 MILLER

Local storm report, May 23, 10:33 PM CDT, 1 hour 2 minutes before

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Local storm report, May 23, 10:35 PM CDT, 1 hour before

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Local storm report, May 23, 11:11 PM CDT, 24 minutes before

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Special weather statement, May 23, 11:25 PM CDT, 10 minutes before

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Local storm report, May 23, 11:33 PM CDT, 2 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 7:57 PM CDT	Severe Thunderstorm Warning	DLH	Lake, Saint Louis	48 min
May 23, 8:22 PM CDT	Special Weather Statement	DLH	Aitkin	13 min
May 23, 8:32 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin	28 min
May 23, 8:58 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Pine	32 min
May 23, 9:30 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Carlton, Pine	45 min
May 23, 9:47 PM CDT	Special Weather Statement	DLH	Carlton, Lake	13 min
May 23, 9:58 PM CDT	Severe Thunderstorm Warning	DLH	Lake	32 min
May 23, 10:02 PM CDT	Special Marine Warning	DLH		58 min
May 23, 10:15 PM CDT	Severe Thunderstorm Warning	DLH	Carlton, Pine	45 min
May 23, 10:40 PM CDT	Areal Flood Advisory	DLH	Aitkin, Carlton, Pine	4 hr
May 23, 10:45 PM CDT	Areal Flood Advisory	DLH	Lake, Saint Louis	4 hr
May 23, 11:25 PM CDT	Special Weather Statement	DLH	Aitkin, Carlton	35 min
May 23, 11:48 PM CDT	Special Weather Statement	DLH	Lake	12 min
May 24, 12:25 AM CDT	Special Weather Statement	DLH	Aitkin, Crow Wing, Pine	50 min
May 24, 12:28 AM CDT	Special Marine Warning	DLH		92 min
May 24, 12:56 AM CDT	Special Weather Statement	DLH	Aitkin	49 min
May 24, 1:10 AM CDT	Special Marine Warning	DLH		48 min
May 24, 1:18 AM CDT	Special Weather Statement	DLH	Cass	57 min
May 24, 1:49 AM CDT	Special Weather Statement	DLH	Cass	41 min
May 24, 2:01 AM CDT	Special Weather Statement	DLH	Itasca	44 min
May 24, 2:04 AM CDT	Severe Thunderstorm Warning	DLH	Itasca	41 min
May 24, 2:16 AM CDT	Severe Thunderstorm Warning	DLH	Cass, Itasca	29 min
May 24, 2:37 AM CDT	Severe Thunderstorm Warning	DLH	Itasca	38 min
May 24, 2:39 AM CDT	Severe Thunderstorm Warning	DLH	Itasca	36 min
May 24, 3:06 AM CDT	Severe Thunderstorm Warning	DLH	Itasca, Koochiching	42 min
May 24, 3:10 AM CDT	Severe Thunderstorm Warning	DLH	Itasca, Koochiching, Saint Louis	64 min
May 24, 3:22 AM CDT	Severe Thunderstorm Warning	DLH	Itasca, Saint Louis	38 min
May 24, 4:32 AM CDT	Special Weather Statement	DLH	Saint Louis	58 min
May 24, 4:44 AM CDT	Special Weather Statement	DLH	Itasca	61 min
May 24, 4:57 AM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	48 min
May 24, 5:40 AM CDT	Severe Thunderstorm Warning	DLH	Lake, Saint Louis	35 min
May 24, 6:10 AM CDT	Severe Thunderstorm Warning	DLH	Saint Louis	20 min
May 24, 6:16 AM CDT	Severe Thunderstorm Warning	DLH	Itasca	44 min
May 24, 6:42 AM CDT	Special Weather Statement	DLH	Koochiching	48 min
May 24, 6:59 AM CDT	Special Weather Statement	DLH		46 min
May 24, 7:03 AM CDT	Special Weather Statement	DLH	Itasca	12 min
May 24, 7:20 AM CDT	Special Weather Statement	DLH		30 min
May 24, 9:44 AM CDT	Special Weather Statement	DLH	Koochiching	16 min
May 24, 10:10 AM CDT	Special Weather Statement	DLH	Koochiching	35 min
May 24, 10:50 AM CDT	Special Weather Statement	DLH	Koochiching	15 min
May 24, 11:09 AM CDT	Special Weather Statement	DLH	Koochiching	21 min
May 24, 11:25 AM CDT	Special Weather Statement	DLH		20 min
May 24, 11:44 AM CDT	Special Weather Statement	DLH		16 min
May 24, 1:44 PM CDT	Special Weather Statement	DLH	Lake of the Woods	31 min
May 24, 3:12 PM CDT	Marine Dense Fog Advisory	DLH		21 hr
May 24, 5:10 PM CDT	Special Weather Statement	DLH	Koochiching	20 min
May 24, 5:33 PM CDT	Special Weather Statement	DLH	Koochiching	12 min
May 23, 8:48 PM CDT	Special Weather Statement	DLH	Douglas	42 min

Nearby

Flash Flood Warnings in Minnesota, 2010 Every flash flood warning in 2010

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.