Alert archive / Minnesota / Flash Flood Watches in 2011

Flash Flood Watch 5, NWS Duluth, MN

August 1, 201110 counties in Minnesota; 8 counties in Wisconsin

NWS Duluth, MN issued this flash flood watch at Aug 1, 2011, 3:25 PM CDT for 10 counties in Minnesota; 8 counties in Wisconsin. It was in force for 21 hr.

The area

The counties it named.

The facts

Issued
Aug 1, 2011, 3:25 PM CDT (20:25 UTC)
Expired
Aug 2, 2011, 12:00 PM CDT
In force
21 hr
Issued by
NWS Duluth, MN
Flood severity
None

Counties Aitkin County, MN, Carlton County, MN, Cass County, MN, Cook County, MN, Crow Wing County, MN, Itasca County, MN, Koochiching County, MN, Lake County, MN, Pine County, MN, Saint Louis County, MN, Ashland County, WI, Bayfield County, WI, Burnett County, WI, Douglas County, WI, Iron County, WI, Price County, WI, Sawyer County, WI, Washburn County, WI

The radar

The Duluth radar (KDLH), 15 km from the middle of the area, began a volume at 20:24 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, 8.4 hours before the alert went out and 235 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2011-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2974 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2011-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 10 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
2974 J/kg
Mixed-layer CIN
-122 J/kg
Mixed-layer LCL
898 m above ground
0-6 km bulk shear
15 kt
0-1 km storm-relative helicity
10 m²/s²
0-3 km storm-relative helicity
59 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood watch 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 watch went out at Aug 1, 12:42 PM CDT, 2 hours 43 minutes earlier.

Area forecast discussion, Aug 1, 12:42 PM CDT, 2 hours 43 minutes before
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Hazardous weather outlook, Aug 1, 7:35 AM CDT, 7 hours 50 minutes before
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In the hours before

Special weather statement, Aug 1, 9:38 AM CDT, 5 hours 47 minutes before
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Special weather statement, Aug 1, 10:54 AM CDT, 4 hours 31 minutes before
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Special weather statement, Aug 1, 10:57 AM CDT, 4 hours 28 minutes before
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Special weather statement, Aug 1, 11:36 AM CDT, 3 hours 49 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Aug 1, 5:49 AM CDTSpecial Weather StatementDLHKoochiching56 min
Aug 1, 6:30 AM CDTSpecial Weather StatementDLHKoochiching45 min
Aug 1, 7:06 AM CDTSpecial Weather StatementDLHKoochiching54 min
Aug 1, 8:37 AM CDTSpecial Weather StatementDLHSaint Louis53 min
Aug 1, 9:38 AM CDTSpecial Weather StatementDLHSaint Louis52 min
Aug 1, 10:54 AM CDTSpecial Weather StatementDLHLake36 min
Aug 1, 10:57 AM CDTSpecial Weather StatementDLHLake33 min
Aug 1, 11:36 AM CDTSpecial Weather StatementDLHLake39 min
Aug 1, 4:59 PM CDTSpecial Weather StatementDLHAitkin46 min

Nearby

Flash Flood Watches in Minnesota, 2011Flash Flood Watches in Wisconsin, 2011Every flash flood watch 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.