Alert archive / Minnesota / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 613

July 23, 200119 counties in Minnesota; 12 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jul 23, 2001, 6:00 AM CDT for 19 counties in Minnesota; 12 counties in Wisconsin. It was in force for 4 hr.

The area

The outline as issued.

The facts

Issued: Jul 23, 2001, 6:00 AM CDT (11:00 UTC)
Expired: Jul 23, 2001, 10:00 AM CDT
In force: 4 hr
Issued by: the Storm Prediction Center

All 31 counties

Blue Earth County, MN, Chisago County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Le Sueur County, MN, Mower County, MN, Olmsted County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Winona County, MN, Barron County, WI, Buffalo County, WI, Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Rusk County, WI, Saint Croix County, WI, Taylor County, WI, Trempealeau County, WI

The radar

The Minneapolis radar (KMPX), 86 km from the middle of the area, began a volume at 11:03 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

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

Issued	Product	Office	Counties	Lasted
Jul 23, 6:04 AM CDT	Severe Thunderstorm Warning	MPX	Le Sueur	41 min
Jul 23, 6:21 AM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk	54 min
Jul 23, 7:31 AM CDT	Severe Thunderstorm Warning	MPX	Goodhue	44 min

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 11.0 hours before the alert went out and 88 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: 2234 J/kg
Mixed-layer CIN: -60 J/kg
Mixed-layer LCL: 1124 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 200 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

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

959 
WWUS9 KMKC 231044
SEL3  
MKC WW 231036
MNZ000-WIZ000-231500-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 613
STORM PREDICTION CENTER NORMAN OK
536 AM CDT MON JUL 23 2001

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

   SOUTHEAST MINNESOTA                          
   WEST CENTRAL WISCONSIN                          
   
EFFECTIVE THIS MONDAY MORNING FROM 600 AM UNTIL 1000 AM CDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 70 STATUTE MILES
EAST AND WEST OF A LINE FROM 40 MILES SOUTHWEST OF ROCHESTER
MINNESOTA TO 55 MILES NORTH OF EAU CLAIRE WISCONSIN.

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 612...

DISCUSSION...SEVERAL BOW ECHOES HAVE INTENSIFIED DURING THE LAST
HOUR AS THEY MOVED ACROSS EAST CENTRAL AND SRN MN IN ASSOCIATION
WITH A SHORT WAVE TROUGH MOVING TOWARD THE UPPER MS VALLEY.  AIR
MASS AHEAD OF THE CONVECTION REMAINS MOIST WITH DEW POINTS IN THE
LOW 70S SUGGESTING CONTINUED POTENTIAL FOR OCCASIONAL DAMAGING
GUSTS AND MARGINALLY SEVERE HAIL DURING THE NEXT FEW HOURS.


AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION
VECTOR 26030.


...WEISS

433,0942 453,0925 453,0900 433,0914

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 23, 2:30 AM CDT	Severe Thunderstorm Watch	SPC	Anoka, Benton, Brown, Carver, Chippewa, Chisago and 28 more	7 hr

Nearby

Severe Thunderstorm Watches in Minnesota, 2001 Severe Thunderstorm Watches in Wisconsin, 2001 Every 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.