Alert archive / Wisconsin / Tornado Watches in 2004
Tornado Watch 824
The Storm Prediction Center issued this tornado watch at Sep 15, 2004, 12:25 PM CDT for 4 states. It was in force for 8 hr.
The area
The outline as issued.
The facts
- Issued
- Sep 15, 2004, 12:25 PM CDT (17:25 UTC)
- Expired
- Sep 15, 2004, 8:00 PM CDT
- In force
- 8 hr
- Issued by
- the Storm Prediction Center
All 73 counties
Allamakee County, IA, Bremer County, IA, Butler County, IA, Chickasaw County, IA, Clayton County, IA, Fayette County, IA, Floyd County, IA, Howard County, IA, Mitchell County, IA, Winneshiek County, IA, Gogebic County, MI, Iron County, MI, Carlton County, MN, Dodge County, MN, Fillmore County, MN, Goodhue County, MN, Houston County, MN, Mower County, MN, Olmsted County, MN, Pine County, MN, Wabasha County, MN, Winona County, MN, Adams County, WI, Ashland County, WI, Barron County, WI, Bayfield County, WI, Buffalo County, WI, Burnett County, WI, Chippewa County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Douglas County, WI, Dunn County, WI, Eau Claire County, WI, Florence County, WI, Forest County, WI, Grant County, WI, Green Lake County, WI, Iowa County, WI, Iron County, WI, Jackson County, WI, Jefferson County, WI, Juneau County, WI, La Crosse County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oneida County, WI, Pepin County, WI, Pierce County, WI, Polk County, WI, Portage County, WI, Price County, WI, Richland County, WI, Rusk County, WI, Saint Croix County, WI, Sauk County, WI, Sawyer County, WI, Shawano County, WI, Taylor County, WI, Trempealeau County, WI, Vernon County, WI, Vilas County, WI, Washburn County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 51 km from the middle of the area, began a volume at 17:26 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
1 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 15, 2:50 PM CDT | Severe Thunderstorm Warning | GRB | Lincoln, Marathon, Wood | 55 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
Minneapolis, MN (KMPX), launched 12:00Z, 5.4 hours before the alert went out and 204 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.
- Mixed-layer CAPE
- 4 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 473 m above ground
- 0-6 km bulk shear
- 69 kt
- 0-1 km storm-relative helicity
- 104 m²/s²
- 0-3 km storm-relative helicity
- 5 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 151726
SEL4
SPC WW 151725
IAZ000-MIZ000-MNZ000-WIZ000-LSZ000-160100-
URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 824
NWS STORM PREDICTION CENTER NORMAN OK
1225 PM CDT WED SEP 15 2004
THE NWS STORM PREDICTION CENTER HAS ISSUED A
TORNADO WATCH FOR PORTIONS OF
FAR NORTHEAST IOWA
WESTERN UPPER MICHIGAN
FAR EASTERN MINNESOTA
WESTERN AND NORTHERN WISCONSIN
LAKE SUPERIOR
EFFECTIVE THIS WEDNESDAY AFTERNOON AND EVENING FROM 1225 PM UNTIL
800 PM CDT.
TORNADOES...HAIL TO 1 INCH IN DIAMETER...THUNDERSTORM WIND GUSTS
TO 70 MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE TORNADO WATCH AREA IS ALONG AND 105 STATUTE MILES EAST AND
WEST OF A LINE FROM 50 MILES SOUTHWEST OF LONEROCK WISCONSIN TO 20
MILES WEST NORTHWEST OF IRONWOOD MICHIGAN.
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 823...
DISCUSSION...STRONG SURFACE LOW AHEAD OF NEGATIVELY TILTED MID/UPPER
LEVEL TROUGH WILL CONTINUE LIFTING NNEWD TOWARDS WRN LAKE SUPERIOR
THIS AFTERNOON...WITH COLD FRONT TRAILING SSWWD ACROSS WRN/CENTRAL
WI INTO NERN IA. AIR MASS HAS DESTABILIZED AND IS WEAKLY CAPPED
EAST OF THE SURFACE LOW AND SWD ALONG THE COLD FRONT SUGGESTING
THUNDERSTORMS MAY FORM SOON OVER WRN PORTIONS OF WATCH. VERY STRONG
LOW AND DEEP LAYER SHEAR SUPPORTS FAST MOVING SUPERCELLS AND SMALL
LINES WITH THREATS OF DAMAGING WINDS AND A FEW TORNADOES MOVING
ENEWD INTO THE EARLY EVENING.
AVIATION...TORNADOES AND 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 24040.
...EVANS
424,0925 463,0924 463,0881 424,0884SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 7:17 PM CDT | Mesoscale Discussion | SPC | Adair, Audubon, Boone, Buena Vista, Calhoun, Carroll and 32 more | 118 min |
| Sep 14, 8:16 PM CDT | Mesoscale Discussion | SPC | Allamakee, Chickasaw, Howard, Mitchell, Winneshiek | 3 hr |
| Sep 15, 4:00 AM CDT | Mesoscale Discussion | SPC | Adair, Adams, Appanoose, Audubon, Benton, Black Hawk and 37 more | 3 hr |
| Sep 15, 3:23 PM CDT | Mesoscale Discussion | SPC | Dickinson, Gogebic, Iron, Menominee | 97 min |
| Sep 15, 10:47 AM CDT | Mesoscale Discussion | SPC | Chisago, Dakota, Dodge, Fillmore, Goodhue, Houston and 6 more | 88 min |
Nearby
Tornado Watches in Wisconsin, 2004Tornado Watches in Iowa, 2004Tornado Watches in Minnesota, 2004Every tornado watch in 2004
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.