Alert archive / Wisconsin / Severe Thunderstorm Watches in 2002
Severe Thunderstorm Watch 556
The Storm Prediction Center issued this severe thunderstorm watch at Jul 30, 2002, 5:35 PM CDT for Allamakee County, Clayton County, Fayette County, Iowa; 37 counties in Wisconsin. It was in force for 5 hr.
The area
The outline as issued.
The facts
- Issued
- Jul 30, 2002, 5:35 PM CDT (22:35 UTC)
- Expired
- Jul 30, 2002, 11:00 PM CDT
- In force
- 5 hr
- Issued by
- the Storm Prediction Center
All 40 counties
Allamakee County, IA, Clayton County, IA, Fayette County, IA, Adams County, WI, Brown County, WI, Calumet County, WI, Clark County, WI, Columbia County, WI, Crawford County, WI, Dane County, WI, Dodge County, WI, Fond du Lac County, WI, Grant County, WI, Green County, WI, Green Lake County, WI, Iowa County, WI, Jackson County, WI, Juneau County, WI, La Crosse County, WI, Lafayette County, WI, Langlade County, WI, Lincoln County, WI, Marathon County, WI, Marinette County, WI, Marquette County, WI, Menominee County, WI, Monroe County, WI, Oconto County, WI, Outagamie County, WI, Portage County, WI, Richland County, WI, Rock County, WI, Sauk County, WI, Shawano County, WI, Taylor County, WI, Vernon County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 80 km from the middle of the area, began a volume at 22:34 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
20 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 5:37 PM CDT | Tornado Warning | ARX | Taylor | 53 min |
| Jul 30, 6:12 PM CDT | Severe Thunderstorm Warning | GRB | Marathon | 63 min |
| Jul 30, 6:24 PM CDT | Severe Thunderstorm Warning | GRB | Lincoln | 66 min |
| Jul 30, 6:37 PM CDT | Severe Thunderstorm Warning | ARX | Allamakee | 53 min |
| Jul 30, 6:42 PM CDT | Tornado Warning | GRB | Marathon | 63 min |
| Jul 30, 7:12 PM CDT | Severe Thunderstorm Warning | GRB | Portage, Wood | 63 min |
| Jul 30, 7:15 PM CDT | Severe Thunderstorm Warning | ARX | Monroe | 60 min |
| Jul 30, 7:16 PM CDT | Severe Thunderstorm Warning | GRB | Langlade | 59 min |
| Jul 30, 7:28 PM CDT | Tornado Warning | GRB | Langlade, Lincoln | 32 min |
| Jul 30, 7:44 PM CDT | Tornado Warning | GRB | Shawano | 46 min |
| Jul 30, 7:55 PM CDT | Severe Thunderstorm Warning | GRB | Lincoln | 35 min |
| Jul 30, 8:03 PM CDT | Severe Thunderstorm Warning | GRB | Menominee | 42 min |
| Jul 30, 8:11 PM CDT | Severe Thunderstorm Warning | GRB | Oconto | 49 min |
| Jul 30, 8:26 PM CDT | Severe Thunderstorm Warning | GRB | Shawano | 49 min |
| Jul 30, 8:29 PM CDT | Severe Thunderstorm Warning | GRB | Waushara | 46 min |
| Jul 30, 8:46 PM CDT | Severe Thunderstorm Warning | GRB | Brown, Vilas | 44 min |
| Jul 30, 8:51 PM CDT | Severe Thunderstorm Warning | GRB | Winnebago | 39 min |
| Jul 30, 8:56 PM CDT | Severe Thunderstorm Warning | GRB | Outagamie | 34 min |
| Jul 30, 9:17 PM CDT | Severe Thunderstorm Warning | GRB | Calumet | 43 min |
| Jul 30, 9:29 PM CDT | Severe Thunderstorm Warning | GRB | Brown, Manitowoc | 46 min |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.6 hours before the alert went out and 188 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
- 104 J/kg
- Mixed-layer CIN
- -191 J/kg
- Mixed-layer LCL
- 1055 m above ground
- 0-6 km bulk shear
- 19 kt
- 0-1 km storm-relative helicity
- 32 m²/s²
- 0-3 km storm-relative helicity
- 123 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 302236
SEL6
SPC WW 302235
IAZ000-WIZ000-310400-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 556
STORM PREDICTION CENTER NORMAN OK
535 PM CDT TUE JUL 30 2002
THE STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHEAST IOWA
WISCONSIN
EFFECTIVE THIS TUESDAY AFTERNOON AND EVENING FROM 535 PM UNTIL 1100
PM CDT.
HAIL TO 2 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS ALONG AND 75 STATUTE MILES
EAST AND WEST OF A LINE FROM 45 MILES SOUTH SOUTHWEST OF LONEROCK
WISCONSIN TO 45 MILES NORTHEAST OF WAUSAU WISCONSIN.
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 554...WW 555...
DISCUSSION...SEVERE THUNDERSTORMS INCREASING RAPIDLY ACROSS SERN MN
INTO WRN WI. WITH AIR MASS EWD ACROSS WI VERY UNSTABLE AND A
FAVORABLE DEEP SHEAR ENVIRONMENT IN PLACE...POTENTIAL FOR DAMAGING
WINDS AND LARGE HAIL WILL SPREAD EWD.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM
MOTION VECTOR 27035.
...HALES
452,0872 423,0890 423,0915 452,0903SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 30, 3:40 PM CDT | Severe Thunderstorm Watch | SPC | Buena Vista, Cherokee, Clay, Dickinson, Emmet, Hancock and 10 more | 5 hr |
Nearby
Severe Thunderstorm Watches in Wisconsin, 2002Severe Thunderstorm Watches in Iowa, 2002Every severe thunderstorm watch in 2002
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.