Alert archive / Minnesota / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 751

September 22, 200115 counties in Minnesota; 10 counties in South Dakota

The Storm Prediction Center issued this severe thunderstorm watch at Sep 22, 2001, 5:15 PM CDT for 15 counties in Minnesota; 10 counties in South Dakota. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Sep 22, 2001, 5:15 PM CDT (22:15 UTC)
Expired
Sep 22, 2001, 10:00 PM CDT
In force
5 hr
Issued by
the Storm Prediction Center
All 25 counties

Big Stone County, MN, Chippewa County, MN, Lac qui Parle County, MN, Lincoln County, MN, Lyon County, MN, Murray County, MN, Nobles County, MN, Pipestone County, MN, Pope County, MN, Redwood County, MN, Rock County, MN, Stevens County, MN, Swift County, MN, Traverse County, MN, Yellow Medicine County, MN, Brookings County, SD, Codington County, SD, Deuel County, SD, Grant County, SD, Hamlin County, SD, Lake County, SD, McCook County, SD, Minnehaha County, SD, Moody County, SD, Roberts County, SD

The radar

The Sioux Falls radar (KFSD), 95 km from the middle of the area, began a volume at 22:16 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

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

IssuedProductOfficeCountiesLasted
Sep 22, 5:37 PM CDTSevere Thunderstorm WarningABRGrant38 min
Sep 22, 6:17 PM CDTSevere Thunderstorm WarningABRDeuel, Grant28 min
Sep 22, 6:28 PM CDTSevere Thunderstorm WarningFSDLyon32 min
Sep 22, 6:34 PM CDTSevere Thunderstorm WarningMPXLac qui Parle41 min
Sep 22, 6:56 PM CDTSevere Thunderstorm WarningFSDLyon34 min
Sep 22, 7:34 PM CDTSevere Thunderstorm WarningMPXSwift41 min

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.3 hours before the alert went out and 154 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, Aberdeen, SD at 12:00Z on 2001-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 56 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, Aberdeen, SD at 12:00Z on 2001-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 305 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
56 J/kg
Mixed-layer CIN
-417 J/kg
Mixed-layer LCL
1381 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
305 m²/s²
0-3 km storm-relative helicity
334 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.9

Open this sounding in Storm Lab

The text

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

721 
WWUS9 KMKC 222204
SEL1  
MKC WW 222159
MNZ000-SDZ000-230300-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 751
STORM PREDICTION CENTER NORMAN OK
459 PM CDT SAT SEP 22 2001

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

   WESTERN MINNESOTA                          
   EASTERN SOUTH DAKOTA                       

EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 515 PM UNTIL
1000 PM CDT.

HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 55 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES EAST SOUTHEAST OF SIOUX FALLS
SOUTH DAKOTA TO 45 MILES WEST OF ALEXANDRIA 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.


DISCUSSION...BAND OF THUNDERSTORMS DEVELOPING OVER NERN SD EXPECTED
TO MOVE EWD AND DEVELOP SWD ALONG INSTABILITY GRADIENT WITH RISK OF
SEVERE HAIL AND DAMAGING WINDS.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES.  EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450.  MEAN STORM
MOTION VECTOR 28035.


...JOHNS

455,0951 432,0951 432,0972 455,0972

Nearby

Severe Thunderstorm Watches in Minnesota, 2001Severe Thunderstorm Watches in South Dakota, 2001Every severe thunderstorm watch in 2001

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.