Alert archive / Minnesota / Flash Flood Warnings in 2010

Flash Flood Warning 6, NWS Duluth, MN

July 17, 2010Cass County, Minnesota

NWS Duluth, MN issued this flash flood warning at Jul 17, 2010, 5:40 PM CDT for Cass County, Minnesota. It was in force for 119 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: Jul 17, 2010, 5:40 PM CDT (22:40 UTC)
Expired: Jul 17, 2010, 7:39 PM CDT
In force: 119 min
Issued by: NWS Duluth, MN
Area: Storm-based polygon
Flood severity: None

County Cass County, MN

The radar

The Duluth radar (KDLH), 161 km from the middle of the area, began a volume at 22:41 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

Minneapolis, MN (KMPX), launched 12:00Z, 10.7 hours before the alert went out and 240 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: 368 J/kg
Mixed-layer CIN: -101 J/kg
Mixed-layer LCL: 1285 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 226 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

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 Jul 17, 3:16 PM CDT, 2 hours 24 minutes earlier.

Area forecast discussion, Jul 17, 3:16 PM CDT, 2 hours 24 minutes before

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Hazardous weather outlook, Jul 17, 8:51 AM CDT, 8 hours 49 minutes before

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE DULUTH MN
851 AM CDT SAT JUL 17 2010

MNZ010>012-018>021-025-026-033>038-WIZ001>004-006>009-181030-
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-
851 AM CDT SAT JUL 17 2010

...THERE IS A MODERATE RISK OF SEVERE WEATHER NEAR THE BRAINERD
LAKES AREA TO THE ST. CROIX RIVER VALLEY THIS AFTERNOON...

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

.DAY ONE...TODAY AND TONIGHT

THE MODERATE RISK OF SEVERE THUNDERSTORMS WILL BE FOUND WEST OF A
LINE FROM HACKENSACK TO DUXBURY MINNESOTA TO HERTEL WISCONSIN.
THIS AREA IS LIKELY TO ENCOUNTER THUNDERSTORMS WITH VERY LARGE
HAIL AND DAMAGING WINDS. THE SLIGHT RISK OF SEVERE THUNDERSTORMS
IS WEST OF A LINE FROM LITTLEFORK TO TWO HARBORS
MINNESOTA...PORT WING TO PARK FALLS WISCONSIN...INCLUDING THE
TWIN PORTS HARBOR. THE MAIN HAZARDS WITH ANY SEVERE STORM WILL BE
LARGE HAIL AND DAMAGING WINDS. HEAVY RAIN AND FREQUENT LIGHTNING
WILL ALSO ACCOMPANY THE STORMS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

AN UNSETTLED WEATHER PATTERN WILL REMAIN ACROSS THE REGION NEXT
WEEK. THUNDERSTORMS MAY DEVELOP MONDAY THROUGH WEDNESDAY.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

LSZ121-140>148-181030-
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-
851 AM CDT SAT JUL 17 2010

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

.DAY ONE...TODAY AND TONIGHT

THUNDERSTORMS ARE EXPECTED TO BECOME WIDESPREAD AND MOVE ACROSS
LAKE SUPERIOR LATE THIS AFTERNOON AND TONIGHT. THERE IS A SLIGHT
RISK OF SEVERE THUNDERSTORMS SOUTH OF A TWO HARBORS MINNESOTA TO
PORT WING WISCONSIN LINE.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY

THERE IS A SLIGHT CHANCE OF THUNDERSTORMS NORTH OF GRAND MARAIS SUNDAY.

AN UNSETTLED WEATHER PATTERN WILL REMAIN ACROSS THE REGION NEXT
WEEK. THUNDERSTORMS MAY DEVELOP MONDAY THROUGH WEDNESDAY.

GSF

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, Jul 17, 2:25 PM CDT, 3 hours 15 minutes before

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Special weather statement, Jul 17, 2:29 PM CDT, 3 hours 11 minutes before

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Local storm report, Jul 17, 2:35 PM CDT, 3 hours 5 minutes before

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Special weather statement, Jul 17, 3:19 PM CDT, 2 hours 21 minutes before

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Local storm report, Jul 17, 3:28 PM CDT, 2 hours 12 minutes before

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Local storm report, Jul 17, 4:48 PM CDT, 52 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
Jul 17, 12:05 PM CDT	Special Weather Statement	DLH	Crow Wing	55 min
Jul 17, 12:17 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Cass, Crow Wing	43 min
Jul 17, 12:49 PM CDT	Tornado Warning	DLH	Cass, Crow Wing	26 min
Jul 17, 1:29 PM CDT	Special Weather Statement	DLH	Aitkin	46 min
Jul 17, 1:51 PM CDT	Special Weather Statement	DLH	Cass	39 min
Jul 17, 2:25 PM CDT	Special Weather Statement	DLH	Cass	50 min
Jul 17, 2:29 PM CDT	Special Weather Statement	DLH	Crow Wing	46 min
Jul 17, 3:19 PM CDT	Special Weather Statement	DLH	Aitkin	26 min
Jul 17, 4:25 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Crow Wing	50 min
Jul 17, 4:27 PM CDT	Severe Thunderstorm Warning	DLH	Cass	33 min
Jul 17, 4:58 PM CDT	Severe Thunderstorm Warning	DLH	Cass, Crow Wing	47 min
Jul 17, 5:11 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Crow Wing	34 min
Jul 17, 5:40 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Crow Wing	50 min
Jul 17, 5:54 PM CDT	Severe Thunderstorm Warning	DLH	Crow Wing	36 min
Jul 17, 6:03 PM CDT	Special Weather Statement	DLH	Pine	27 min
Jul 17, 6:31 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Crow Wing	28 min
Jul 17, 6:42 PM CDT	Special Weather Statement	DLH	Pine	33 min
Jul 17, 6:44 PM CDT	Special Weather Statement	DLH	Crow Wing	46 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.