Alert archive / Minnesota / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 561

July 31, 20027 counties in Minnesota; Douglas County, Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jul 31, 2002, 10:00 PM CDT for 7 counties in Minnesota; Douglas County, Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Jul 31, 2002, 10:00 PM CDT (03:00 UTC)
Expired
Aug 1, 2002, 4:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center

Counties Aitkin County, MN, Carlton County, MN, Cass County, MN, Crow Wing County, MN, Itasca County, MN, Koochiching County, MN, Saint Louis County, MN, Douglas County, WI

The radar

The Duluth radar (KDLH), 93 km from the middle of the area, began a volume at 03:04 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.

Warnings issued inside it

8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 31, 11:47 PM CDTSevere Thunderstorm WarningDLHCass, Itasca58 min
Aug 1, 12:50 AM CDTSevere Thunderstorm WarningDLHCass, Itasca, Saint Louis70 min
Aug 1, 1:00 AM CDTFlash Flood WarningDLHAitkin, Cass, Itasca3 hr
Aug 1, 1:08 AM CDTFlash Flood WarningDLHAitkin, Cass, Itasca3 hr
Aug 1, 1:53 AM CDTSevere Thunderstorm WarningDLHSaint Louis52 min
Aug 1, 2:17 AM CDTSevere Thunderstorm WarningDLHCarlton, Lake73 min
Aug 1, 2:48 AM CDTSevere Thunderstorm WarningDLHSaint Louis27 min
Aug 1, 3:32 AM CDTSevere Thunderstorm WarningDLHAshland, Bayfield, Douglas73 min

The nearest sounding before it

International Fa, MN (KINL), launched 00:00Z, 3.0 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 2002-08-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1707 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 2002-08-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 20 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
1707 J/kg
Mixed-layer CIN
-48 J/kg
Mixed-layer LCL
1366 m above ground
0-6 km bulk shear
50 kt
0-1 km storm-relative helicity
20 m²/s²
0-3 km storm-relative helicity
88 m²/s²
Significant tornado parameter
0.1
Supercell composite
1.1

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 1, 4:45 AM CDTSevere Thunderstorm WatchSPCFlorence4 hr
Aug 1, 10:20 AM CDTSevere Thunderstorm WatchSPCBrown, Calumet, Door, Florence, Forest, Kewaunee and 15 more5 hr
Aug 1, 2:25 PM CDTSevere Thunderstorm WatchSPCBrown, Calumet, Door, Florence, Forest, Kewaunee and 13 more6 hr

Nearby

Severe Thunderstorm Watches in Minnesota, 2002Severe Thunderstorm Watches in Wisconsin, 2002Every severe thunderstorm watch in 2002

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.