Alert archive / Iowa / Tornado Watches in 2001

Tornado Watch 182

May 1, 200130 counties in Iowa; 30 counties in Minnesota; 9 counties in Wisconsin

The Storm Prediction Center issued this tornado watch at May 1, 2001, 3:00 PM CDT for 30 counties in Iowa; 30 counties in Minnesota; 9 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 1, 2001, 3:00 PM CDT (20:00 UTC)
Expired
May 1, 2001, 9:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 69 counties

Buena Vista County, IA, Butler County, IA, Calhoun County, IA, Cerro Gordo County, IA, Cherokee County, IA, Chickasaw County, IA, Clay County, IA, Dickinson County, IA, Emmet County, IA, Floyd County, IA, Franklin County, IA, Grundy County, IA, Hamilton County, IA, Hancock County, IA, Hardin County, IA, Howard County, IA, Humboldt County, IA, Ida County, IA, Kossuth County, IA, Mitchell County, IA, O'Brien County, IA, Osceola County, IA, Palo Alto County, IA, Pocahontas County, IA, Sac County, IA, Webster County, IA, Winnebago County, IA, Woodbury County, IA, Worth County, IA, Wright County, IA, Anoka County, MN, Blue Earth County, MN, Brown County, MN, Carver County, MN, Cottonwood County, MN, Dakota County, MN, Dodge County, MN, Faribault County, MN, Fillmore County, MN, Freeborn County, MN, Goodhue County, MN, Hennepin County, MN, Jackson County, MN, Le Sueur County, MN, Martin County, MN, McLeod County, MN, Mower County, MN, Nicollet County, MN, Olmsted County, MN, Ramsey County, MN, Rice County, MN, Scott County, MN, Sibley County, MN, Steele County, MN, Wabasha County, MN, Waseca County, MN, Washington County, MN, Watonwan County, MN, Winona County, MN, Wright County, MN, Buffalo County, WI, Chippewa County, WI, Dunn County, WI, Eau Claire County, WI, Pepin County, WI, Pierce County, WI, Saint Croix County, WI, Taylor County, WI, Trempealeau County, WI

The radar

The Minneapolis radar (KMPX), 159 km from the middle of the area, began a volume at 20:02 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

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

IssuedProductOfficeCountiesLasted
May 1, 3:51 PM CDTSevere Thunderstorm WarningFSDBuena Vista24 min
May 1, 4:08 PM CDTSevere Thunderstorm WarningFSDClay22 min
May 1, 4:09 PM CDTSevere Thunderstorm WarningDMXPalo Alto31 min
May 1, 4:24 PM CDTSevere Thunderstorm WarningMPXCarver, McLeod, Sibley51 min
May 1, 4:35 PM CDTSevere Thunderstorm WarningDMXPalo Alto20 min
May 1, 4:36 PM CDTSevere Thunderstorm WarningMPXBlue Earth, Faribault39 min
May 1, 4:36 PM CDTSevere Thunderstorm WarningMPXLe Sueur39 min
May 1, 4:42 PM CDTSevere Thunderstorm WarningDMXKossuth28 min
May 1, 4:50 PM CDTTornado WarningMPXBlue Earth25 min
May 1, 4:55 PM CDTTornado WarningMPXCarver35 min
May 1, 5:06 PM CDTSevere Thunderstorm WarningMPXWaseca39 min
May 1, 5:09 PM CDTSevere Thunderstorm WarningDMXWinnebago31 min
May 1, 5:13 PM CDTSevere Thunderstorm WarningMPXAnoka, Hennepin47 min
May 1, 5:18 PM CDTSevere Thunderstorm WarningMPXFaribault, Freeborn42 min
May 1, 5:21 PM CDTTornado WarningMPXAnoka, Hennepin24 min
May 1, 5:27 PM CDTSevere Thunderstorm WarningMPXSteele48 min
May 1, 5:35 PM CDTSevere Thunderstorm WarningMPXDakota, Ramsey, Washington55 min
May 1, 5:37 PM CDTTornado WarningMPXWaseca23 min
May 1, 5:43 PM CDTSevere Thunderstorm WarningARXDodge, Mower62 min
May 1, 5:49 PM CDTSevere Thunderstorm WarningMPXAnoka, Chisago41 min
May 1, 6:03 PM CDTTornado WarningMPXSteele, Waseca42 min
May 1, 6:10 PM CDTSevere Thunderstorm WarningMPXPierce, Saint Croix50 min
May 1, 6:31 PM CDTSevere Thunderstorm WarningMPXWashington29 min
May 1, 6:45 PM CDTSevere Thunderstorm WarningARXDodge30 min
May 1, 6:47 PM CDTTornado WarningMPXPierce28 min
May 1, 6:55 PM CDTSevere Thunderstorm WarningARXMower65 min
May 1, 7:03 PM CDTSevere Thunderstorm WarningMPXSaint Croix42 min
May 1, 7:05 PM CDTSevere Thunderstorm WarningMPXFreeborn40 min
May 1, 7:06 PM CDTTornado WarningARXMower39 min
May 1, 7:06 PM CDTTornado WarningMPXFreeborn24 min
May 1, 7:19 PM CDTSevere Thunderstorm WarningMPXDunn, Pierce41 min
May 1, 7:27 PM CDTSevere Thunderstorm WarningARXDodge, Olmsted63 min
May 1, 7:30 PM CDTTornado WarningMPXFreeborn30 min
May 1, 7:44 PM CDTTornado WarningARXMower46 min
May 1, 7:51 PM CDTTornado WarningARXOlmsted39 min
May 1, 7:51 PM CDTSevere Thunderstorm WarningMPXChippewa39 min
May 1, 8:03 PM CDTTornado WarningARXFillmore57 min
May 1, 8:10 PM CDTTornado WarningARXWinona50 min
May 1, 8:43 PM CDTSevere Thunderstorm WarningARXLa Crosse, Trempealeau62 min
May 1, 8:43 PM CDTSevere Thunderstorm WarningARXBuffalo62 min

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 8.0 hours before the alert went out and 158 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, Minneapolis, MN at 12:00Z on 2001-05-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2001-05-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 24 square meters per square second.1939587897Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
771 m above ground
0-6 km bulk shear
34 kt
0-1 km storm-relative helicity
24 m²/s²
0-3 km storm-relative helicity
73 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 
WWUS9 KMKC 011945
SEL2  

SEL2  
MKC WW 011939
IAZ000-MNZ000-WIZ000-020200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 182
STORM PREDICTION CENTER NORMAN OK
239 PM CDT TUE MAY 1 2001

THE STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF

   NORTHERN IOWA                               
   SOUTHERN AND EAST CENTRAL MINNESOTA                          
   WEST CENTRAL WISCONSIN                          

EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 300 PM UNTIL 900
PM CDT.

TORNADOES...HAIL TO 3 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE TORNADO WATCH AREA IS ALONG AND 95 STATUTE MILES EAST AND WEST
OF A LINE FROM 35 MILES SOUTHWEST OF FORT DODGE IOWA TO 50 MILES
NORTHWEST OF EAU CLAIRE WISCONSIN.

REMEMBER...A TORNADO WATCH MEANS CONDITIONS ARE FAVORABLE FOR
TORNADOES AND 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.


DISCUSSION...THUNDERSTORMS ARE EXPECTED TO DEVELOP AND INTENSIFY
ALONG STRONG COLD FRONT NOW MOVING ACROSS WRN MN AND EXTREME NWRN
IA.  AIR MASS BECOME VERY UNSTABLE WITH SBCAPE TO 3000 J/KG. 
EXAMINATION OF WDL PROFILER AND MPX VAD WINDS SHOWS SUFFICIENT
VEERING AND INCREASING SPEED WITH HEIGHT TO SUPPORT STORM ROTATION
...WITH POTENTIAL FOR VERY LARGE HAIL...DAMAGING WIND GUSTS AND
ISOLATED TORNADOES.

ADDITIONAL WW WILL BE ISSUED SHORTLY FROM ERN NEB INTO CENTAL AND
SWRN IA.


AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 3 INCHES. X EXTREME TURBULENCE AND SURFACE WIND
GUSTS TO 60 KNOTS.  A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 550. 
MEAN STORM MOTION VECTOR 24035.


...WEISS

;452,0901 421,0924 421,0963 452,0941;

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 1, 3:30 PM CDTSevere Thunderstorm WatchSPCAudubon, Boone, Carroll, Cass, Crawford, Dallas and 9 more6 hr
May 1, 5:00 PM CDTTornado WatchSPCAitkin, Carlton, Chisago, Cook, Isanti, Itasca and 6 more5 hr

Nearby

Tornado Watches in Iowa, 2001Tornado Watches in Minnesota, 2001Tornado Watches in Wisconsin, 2001Every tornado 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.