Alert archive / Minnesota / Severe Thunderstorm Watches in 2002

Severe Thunderstorm Watch 593

August 11, 200222 counties in Minnesota; Cass County, Richland County, Traill County, North Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Aug 11, 2002, 6:45 PM CDT for 22 counties in Minnesota; Cass County, Richland County, Traill County, North Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued: Aug 11, 2002, 6:45 PM CDT (23:45 UTC)
Expired: Aug 12, 2002, 12:00 AM CDT
In force: 5 hr
Issued by: the Storm Prediction Center

All 25 counties

Aitkin County, MN, Becker County, MN, Beltrami County, MN, Cass County, MN, Clay County, MN, Clearwater County, MN, Crow Wing County, MN, Hubbard County, MN, Itasca County, MN, Kittson County, MN, Koochiching County, MN, Lake of the Woods County, MN, Mahnomen County, MN, Marshall County, MN, Norman County, MN, Otter Tail County, MN, Pennington County, MN, Polk County, MN, Red Lake County, MN, Roseau County, MN, Wadena County, MN, Wilkin County, MN, Cass County, ND, Richland County, ND, Traill County, ND

Warnings issued inside it

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

Issued	Product	Office	Counties	Lasted
Aug 11, 7:12 PM CDT	Severe Thunderstorm Warning	FGF	Clay, Norman	48 min
Aug 11, 7:51 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Clearwater, Mahnomen	54 min
Aug 11, 7:56 PM CDT	Tornado Warning	FGF	Mahnomen, Norman	49 min
Aug 11, 8:37 PM CDT	Severe Thunderstorm Warning	FGF	Polk	23 min
Aug 11, 8:46 PM CDT	Severe Thunderstorm Warning	FGF	Becker, Beltrami, Clearwater, Hubbard	59 min
Aug 11, 8:53 PM CDT	Tornado Warning	FGF	Beltrami, Clearwater, Hubbard	52 min
Aug 11, 9:26 PM CDT	Severe Thunderstorm Warning	DLH	Aitkin, Cass, Crow Wing, Itasca	79 min
Aug 11, 9:37 PM CDT	Severe Thunderstorm Warning	FGF	Otter Tail, Wadena	38 min

The nearest sounding before it

International Fa, MN (KINL), launched 12:00Z, 11.8 hours before the alert went out and 225 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: 710 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 63 m²/s²
0-3 km storm-relative helicity: 110 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WWUS20 KWNS 112343
SEL3  
SPC WW 112345
MNZ000-NDZ000-120500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 593
STORM PREDICTION CENTER NORMAN OK
645 PM CDT SUN AUG 11 2002

THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF

   NORTHERN MINNESOTA                          
   EXTREME EASTERN NORTH DAKOTA                       

EFFECTIVE THIS SUNDAY NIGHT AND MONDAY MORNING FROM 645 PM UNTIL
MIDNIGHT CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 100 STATUTE MILES
EAST AND WEST OF A LINE FROM 60 MILES WEST SOUTHWEST OF BRAINERD
MINNESOTA TO 20 MILES EAST NORTHEAST OF WARROAD MINNESOTA.

REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. 
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS.  SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.

OTHER WATCH INFORMATION...  CONTINUE...WW 589...WW 590...WW
591...WW 592...

DISCUSSION...LINE OF STRONG/SEVERE STORMS IN EASTERN ND IS EXPECTED
TO TRACK EASTWARD ACROSS NORTHERN MN DURING THE EVENING HOURS. 
STRONG INSTABILITY...FAVORABLE WIND FIELDS...AND APPROACHING UPPER
TROUGH WILL SUPPORT A THREAT OF DAMAGING WINDS AND LARGE HAIL WITH
STRONGER CELLS/BOWS.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM
MOTION VECTOR 26040.

...HART

490,0924 460,0931 460,0972 490,0970

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 11, 1:55 PM CDT	Severe Thunderstorm Watch	SPC	Kittson	5 hr

Nearby

Severe Thunderstorm Watches in Minnesota, 2002 Severe Thunderstorm Watches in North Dakota, 2002 Every 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.