Alert archive / Minnesota / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 620

July 25, 20009 counties in Iowa; 23 counties in Minnesota; 5 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Jul 25, 2000, 8:30 PM CDT for 9 counties in Iowa; 23 counties in Minnesota; 5 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued: Jul 25, 2000, 8:30 PM CDT (01:30 UTC)
Expired: Jul 26, 2000, 2:00 AM CDT
In force: 6 hr
Issued by: the Storm Prediction Center

All 37 counties

Clay County, IA, Dickinson County, IA, Emmet County, IA, Kossuth County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Sioux County, IA, Winnebago County, IA, Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Chisago County, MN, Dakota County, MN, Faribault County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Isanti County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, Nicollet County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Barron County, WI, Dunn County, WI, Pierce County, WI, Polk County, WI, Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 109 km from the middle of the area, began a volume at 01:34 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

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

Issued	Product	Office	Counties	Lasted
Jul 25, 8:39 PM CDT	Tornado Warning	FSD	Osceola	51 min
Jul 25, 8:53 PM CDT	Tornado Warning	MPX	Blue Earth, Brown, Nicollet	67 min
Jul 25, 9:08 PM CDT	Severe Thunderstorm Warning	MPX	Barron, Polk	52 min
Jul 25, 9:13 PM CDT	Tornado Warning	MPX	Hennepin	32 min
Jul 25, 9:41 PM CDT	Severe Thunderstorm Warning	FSD	Dickinson, Lyon, Osceola	49 min
Jul 25, 9:59 PM CDT	Tornado Warning	MPX	Blue Earth	31 min
Jul 25, 10:03 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien, Sioux	42 min
Jul 25, 10:10 PM CDT	Tornado Warning	FSD	Dickinson	35 min
Jul 25, 10:17 PM CDT	Tornado Warning	FSD	Lyon, Sioux	43 min
Jul 25, 10:23 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Watonwan	67 min
Jul 25, 10:28 PM CDT	Tornado Warning	FSD	Clay	47 min
Jul 25, 10:35 PM CDT	Severe Thunderstorm Warning	FSD	Osceola	25 min
Jul 25, 10:51 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien	24 min
Jul 25, 10:59 PM CDT	Severe Thunderstorm Warning	FSD	Sioux	31 min
Jul 25, 11:05 PM CDT	Severe Thunderstorm Warning	DMX	Palo Alto	40 min
Jul 25, 11:18 PM CDT	Severe Thunderstorm Warning	FSD	O'Brien	27 min
Jul 25, 11:19 PM CDT	Severe Thunderstorm Warning	FSD	Buena Vista, Clay	26 min
Jul 25, 11:25 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Faribault	50 min
Jul 26, 1:53 AM CDT	Severe Thunderstorm Warning	FSD	Clay	22 min

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 1.5 hours before the alert went out and 108 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: 1668 J/kg
Mixed-layer CIN: -8 J/kg
Mixed-layer LCL: 1176 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: 103 m²/s²
0-3 km storm-relative helicity: 137 m²/s²
Significant tornado parameter: 0.9
Supercell composite: 5.2

Open this sounding in Storm Lab

The text

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

881 
WWUS9 KMKC 260105
SEL0  

SEL0  
MKC WW 260100
IAZ000-MNZ000-WIZ000-260700-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 620
STORM PREDICTION CENTER NORMAN OK
800 PM CDT TUE JUL 25 2000

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

   NORTHWEST IOWA                               
   SOUTHERN MINNESOTA                          
   WESTERN WISCONSIN                          

EFFECTIVE THIS TUESDAY NIGHT AND WEDNESDAY MORNING FROM 830 PM
UNTIL 200 AM 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 SOUTH SOUTHWEST OF SPENCER
IOWA TO 75 MILES NORTHEAST OF MINNEAPOLIS 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.

OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 619.  WATCH NUMBER 619 WILL NOT BE
IN EFFECT AFTER 830 PM CDT.  CONTINUE...WW 618...

DISCUSSION...SEVERE THUNDERSTORMS CONTINUE TO DEVELOP EWD INTO AXIS
OF MODERATE TO STRONG INSTABILITY.  WITH APPROACH OF MID LEVEL WIND
MAX AND TROUGH PROVIDING FAVORABLE SHEAR PROFILES...EXPECT STORMS
TO CONTINUE TO MOVE PROPAGATE E/SE ACROSS SRN MN INTO NWRN IA.


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 550.  MEAN STORM
MOTION VECTOR 28030.


...HALES

453,0905 425,0941 425,0962 453,0931

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 25, 11:00 PM CDT	Severe Thunderstorm Watch	SPC	Audubon, Boone, Buena Vista, Calhoun, Carroll, Cherokee and 18 more	4 hr
Jul 26, 2:30 PM CDT	Tornado Watch	SPC	Adair, Adams, Appanoose, Audubon, Boone, Carroll and 34 more	6 hr

Nearby

Severe Thunderstorm Watches in Minnesota, 2000 Severe Thunderstorm Watches in Iowa, 2000 Severe Thunderstorm Watches in Wisconsin, 2000 Every severe thunderstorm watch in 2000

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.