Alert archive / Wisconsin / Severe Thunderstorm Watches in 2001

Severe Thunderstorm Watch 721

September 7, 2001Delta County, Dickinson County, Menominee County, Michigan; 22 counties in Wisconsin

The Storm Prediction Center issued this severe thunderstorm watch at Sep 7, 2001, 8:45 PM EDT for Delta County, Dickinson County, Menominee County, Michigan; 22 counties in Wisconsin. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Sep 7, 2001, 8:45 PM EDT (00:45 UTC)
Expired
Sep 8, 2001, 12:00 AM EDT
In force
3 hr
Issued by
the Storm Prediction Center
All 25 counties

Delta County, MI, Dickinson County, MI, Menominee County, MI, Adams County, WI, Brown County, WI, Calumet County, WI, Door County, WI, Florence County, WI, Fond du Lac County, WI, Forest County, WI, Green Lake County, WI, Kewaunee County, WI, Langlade County, WI, Manitowoc County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Shawano County, WI, Sheboygan County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 43 km from the middle of the area, began a volume at 00:48 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

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

IssuedProductOfficeCountiesLasted
Sep 7, 8:51 PM EDTSevere Thunderstorm WarningGRBWinnebago24 min
Sep 7, 9:02 PM EDTSevere Thunderstorm WarningMKXGreen Lake13 min
Sep 7, 9:09 PM EDTSevere Thunderstorm WarningGRBShawano, Waupaca66 min
Sep 7, 9:10 PM EDTSevere Thunderstorm WarningGRBWaushara, Winnebago50 min
Sep 7, 9:28 PM EDTSevere Thunderstorm WarningGRBMenominee47 min

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 00:00Z, 0.8 hours before the alert went out and 44 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, Green Bay/Straub, WI at 00:00Z on 2001-09-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1318 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, Green Bay/Straub, WI at 00:00Z on 2001-09-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 81 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
1318 J/kg
Mixed-layer CIN
-14 J/kg
Mixed-layer LCL
769 m above ground
0-6 km bulk shear
32 kt
0-1 km storm-relative helicity
81 m²/s²
0-3 km storm-relative helicity
158 m²/s²
Significant tornado parameter
0.3
Supercell composite
1.8

Open this sounding in Storm Lab

The text

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

000 
WWUS9 KMKC 080037
SEL1  
MKC WW 080032
MIZ000-WIZ000-LMZ000-080400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 721
STORM PREDICTION CENTER NORMAN OK
732 PM CDT FRI SEP 7 2001

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

   UPPER MICHIGAN                           
   NORTHERN AND EASTERN WISCONSIN                          
   WESTERN LAKE MICHIGAN                      

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 745 PM UNTIL 1100
PM CDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 65 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF OSHKOSH
WISCONSIN TO 20 MILES NORTHEAST OF IRON MOUNTAIN MICHIGAN.

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 714...WW 715...WW
716...WW 717...WW 718...WW 719...WW 720...

DISCUSSION...GIVEN LSE VWP DATA AND LARGE SCALE UPPER AIR PATTERN
PER WATER VAPOR IMAGERY...THUNDERSTORMS DEVELOPING ON NRN EDGE OF
MCS OVER SRN WI EXPECTED TO MAINTAIN A THREAT FOR DAMAGING WINDS AS
THEY CONTINUE NEWD INTO NRN/ERN WI LATER THIS EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION
VECTOR 23035.

...CORFIDI

460,0862 434,0872 434,0900 460,0891

@RUKWBC	&KDENWWUS9 KMKC 080037
SEL1  
MKC WW 080032
MIZ000-WIZ000-LMZ000-080400-

URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 721
STORM PREDICTION CENTER NORMAN OK
732 PM CDT FRI SEP 7 2001

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

   UPPER MICHIGAN                           
   NORTHERN AND EASTERN WISCONSIN                          
   WESTERN LAKE MICHIGAN                      

EFFECTIVE THIS FRIDAY AFTERNOON AND EVENING FROM 745 PM UNTIL 1100
PM CDT.

HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS TO 60
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.

THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 65 STATUTE MILES
EAST AND WEST OF A LINE FROM 20 MILES SOUTH SOUTHWEST OF OSHKOSH
WISCONSIN TO 20 MILES NORTHEAST OF IRON MOUNTAIN MICHIGAN.

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 714...WW 715...WW
716...WW 717...WW 718...WW 719...WW 720...

DISCUSSION...GIVEN LSE VWP DATA AND LARGE SCALE UPPER AIR PATTERN
PER WATER VAPOR IMAGERY...THUNDERSTORMS DEVELOPING ON NRN EDGE OF
MCS OVER SRN WI EXPECTED TO MAINTAIN A THREAT FOR DAMAGING WINDS AS
THEY CONTINUE NEWD INTO NRN/ERN WI LATER THIS EVENING.

AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1 INCH EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 50 KNOTS. 
A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500.  MEAN STORM MOTION
VECTOR 23035.

...CORFIDI

460,0862 434,0872 434,0900 460,0891

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 8, 12:15 AM EDTSevere Thunderstorm WatchSPCAntrim, Benzie, Charlevoix, Cheboygan, Chippewa, Clare and 22 more5 hr
Sep 8, 2:30 PM EDTSevere Thunderstorm WatchSPCAllegan, Arenac, Barry, Bay, Branch, Calhoun and 28 more7 hr
Sep 8, 4:30 PM EDTSevere Thunderstorm WatchSPCAlcona, Alpena, Arenac, Cheboygan, Clare, Crawford and 7 more6 hr
Sep 8, 12:00 AM EDTSevere Thunderstorm WatchSPCColumbia, Crawford, Dane, Dodge, Fond du Lac, Grant and 10 more4 hr

Nearby

Severe Thunderstorm Watches in Wisconsin, 2001Severe Thunderstorm Watches in Michigan, 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.