Alert archive / Wisconsin / Tornado Watches in 2005

Tornado Watch 730

August 18, 2005Allamakee County, Clayton County, Iowa; 21 counties in Wisconsin

The Storm Prediction Center issued this tornado watch at Aug 18, 2005, 2:50 PM CDT for Allamakee County, Clayton County, Iowa; 21 counties in Wisconsin. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Aug 18, 2005, 2:50 PM CDT (19:50 UTC)
Expired
Aug 18, 2005, 9:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 23 counties

Allamakee County, IA, Clayton County, IA, Adams County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Grant County, WI, Green County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Marquette County, WI, Monroe County, WI, Portage County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Trempealeau County, WI, Vernon County, WI, Waushara County, WI, Wood County, WI

The radar

The La Crosse radar (KARX), 57 km from the middle of the area, began a volume at 19:53 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

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

IssuedProductOfficeCountiesLasted
Aug 18, 3:45 PM CDTSevere Thunderstorm WarningARXVernon45 min
Aug 18, 4:09 PM CDTSevere Thunderstorm WarningARXRichland66 min
Aug 18, 4:18 PM CDTTornado WarningARXRichland59 min
Aug 18, 4:37 PM CDTTornado WarningMKXSauk53 min
Aug 18, 4:56 PM CDTTornado WarningARXJuneau39 min
Aug 18, 5:07 PM CDTTornado WarningMKXIowa, Sauk23 min
Aug 18, 5:11 PM CDTSevere Thunderstorm WarningMKXDane64 min
Aug 18, 5:21 PM CDTTornado WarningMKXColumbia, Dane, Iowa, Sauk54 min
Aug 18, 5:43 PM CDTTornado WarningARXAdams26 min
Aug 18, 5:47 PM CDTTornado WarningMKXMarquette43 min
Aug 18, 5:52 PM CDTTornado WarningGRBPortage53 min
Aug 18, 6:06 PM CDTTornado WarningMKXColumbia, Dane39 min
Aug 18, 6:33 PM CDTTornado WarningMKXGreen Lake, Marquette35 min
Aug 18, 6:36 PM CDTTornado WarningGRBWaushara39 min
Aug 18, 6:39 PM CDTTornado WarningMKXDane36 min
Aug 18, 7:15 PM CDTTornado WarningMKXDane, Jefferson63 min
Aug 18, 7:48 PM CDTTornado WarningMKXRock, Walworth57 min

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Green Bay/Straub, WI (KGRB), launched 12:00Z, 7.8 hours before the alert went out and 205 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 12:00Z on 2005-08-18Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 206 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 12:00Z on 2005-08-18The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 66 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
206 J/kg
Mixed-layer CIN
-38 J/kg
Mixed-layer LCL
995 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
66 m²/s²
0-3 km storm-relative helicity
90 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 
WWUS20 KWNS 181949
SEL0  
SPC WW 181949
IAZ000-MNZ000-WIZ000-190200-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 730
NWS STORM PREDICTION CENTER NORMAN OK
250 PM CDT THU AUG 18 2005

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

       EXTREME NORTHEAST IOWA
       EXTREME SOUTHEAST MINNESOTA
       CENTRAL AND SOUTHWEST WISCONSIN

EFFECTIVE THIS THURSDAY AFTERNOON AND EVENING FROM 250 PM UNTIL
900 PM CDT.

TORNADOES...HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND
GUSTS TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE
AREAS.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE MILES
EAST AND WEST OF A LINE FROM 50 MILES NORTH OF CAMP DOUGLAS
WISCONSIN TO 50 MILES SOUTH OF LONEROCK WISCONSIN.  FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU0).

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.

OTHER WATCH INFORMATION...CONTINUE...WW 729...

DISCUSSION...SCATTERED THUNDERSTORMS ARE EXPECTED TO CONTINUE TO
INCREASE THIS AFTERNOON NEAR SURFACE LOW/WARM FRONT FROM EXTREME
SOUTHEAST MN INTO WI.  OTHER STORMS MAY DEVELOP SOUTHWARD INTO
EXTREME NORTHEAST IA.  VERTICAL SHEAR PROFILES WILL PROMOTE
SUPERCELL POTENTIAL NEAR WARM FRONT...WITH THE RISK OF ISOLATED
TORNADOES.  DAMAGING WINDS ARE LIKELY TO BE THE MAIN THREAT FARTHER
SOUTH.

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
500. MEAN STORM MOTION VECTOR 26030.


...HART

443,0890 422,0890 422,0912 443,0912

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 18, 2:09 PM CDTMesoscale DiscussionSPCAllamakee, Cedar, Clayton, Clinton, Delaware, Dubuque and 5 more96 min
Aug 18, 9:00 AM CDTMesoscale DiscussionSPCKenosha, Racine, Rock, Walworth2 hr
Aug 18, 5:47 PM CDTMesoscale DiscussionSPCAdams, Columbia, Crawford, Dane, Dodge, Fond du Lac and 24 more58 min
Aug 18, 5:50 PM CDTTornado WatchSPCDodge, Fond du Lac, Green Lake, Jefferson, Kenosha, Walworth and 2 more5 hr

Nearby

Tornado Watches in Wisconsin, 2005Tornado Watches in Iowa, 2005Every tornado watch in 2005

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.