Alert archive / Minnesota / Flash Flood Warnings in 2010

Flash Flood Warning 3, NWS Duluth, MN

July 4, 2010Cass County, Itasca County, Minnesota

NWS Duluth, MN issued this flash flood warning at Jul 4, 2010, 3:40 AM CDT for Cass County, Itasca County, Minnesota. It was in force for 4 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
Jul 4, 2010, 3:40 AM CDT (08:40 UTC)
Expired
Jul 4, 2010, 7:30 AM CDT
In force
4 hr
Issued by
NWS Duluth, MN
Area
Storm-based polygon
Flood severity
None

Counties Cass County, MN, Itasca County, MN

The radar

The Duluth radar (KDLH), 141 km from the middle of the area, began a volume at 08:41 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

International Fa, MN (KINL), launched 00:00Z, 8.7 hours before the alert went out and 157 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, International Fa, MN at 00:00Z on 2010-07-04Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1692 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, International Fa, MN at 00:00Z on 2010-07-04The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.19395878Sfc1 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
1692 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
1258 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
127 m²/s²
Significant tornado parameter
0.8
Supercell composite
8.9

Open this sounding in Storm Lab

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 3, 10:30 PM CDTSpecial Weather StatementDLHCass45 min
Jul 3, 10:46 PM CDTSpecial Weather StatementDLHKoochiching44 min
Jul 3, 11:10 PM CDTSpecial Weather StatementDLHCass40 min
Jul 3, 11:23 PM CDTSpecial Weather StatementDLHKoochiching37 min
Jul 4, 12:23 AM CDTSpecial Weather StatementDLHCass37 min
Jul 4, 1:33 AM CDTAreal Flood AdvisoryDLHKoochiching, Lake, Saint Louis6 hr
Jul 4, 1:45 AM CDTSpecial Weather StatementDLHCass, Itasca45 min
Jul 4, 4:33 AM CDTSpecial Weather StatementDLHCass, Crow Wing12 min
Jul 4, 5:01 AM CDTFlash Flood WarningDLHItasca, Koochiching, Lake, Saint Louis3 hr
Jul 4, 6:53 AM CDTSpecial Weather StatementDLHCarlton, Pine37 min
Jul 4, 7:28 AM CDTSpecial Weather StatementDLHCarlton, Pine, Saint Louis62 min
Jul 4, 8:03 AM CDTSpecial Weather StatementDLH42 min
Jul 4, 4:23 PM CDTSpecial Weather StatementDLHSaint Louis52 min
Jul 4, 4:39 PM CDTSpecial Weather StatementDLHSaint Louis66 min
Jul 4, 5:41 PM CDTSpecial Weather StatementDLHSaint Louis39 min
Jul 4, 6:18 PM CDTSpecial Weather StatementDLHCarlton27 min

Nearby

Flash Flood Warnings in Minnesota, 2010Every 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.