Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 116, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 21, 1998, 1:01 PM CDT for Rock County, Walworth County, Wisconsin. It was in force for 64 min. 3 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Jul 21, 1998, 1:01 PM CDT (18:01 UTC)
- Expired
- Jul 21, 1998, 2:05 PM CDT
- In force
- 64 min
- Issued by
- NWS Milwaukee, WI
- Area
- Whole counties
Counties Rock County, WI, Walworth County, WI
The radar
The Milwaukee radar (KMKX), 39 km from the middle of the area, began a volume at 18:01 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 21, 1:10 PM CDT | Thunderstorm Wind 87 | Elkhorn, WI | |
| Jul 21, 1:20 PM CDT | Thunderstorm Wind | Beloit, WI | |
| Jul 21, 1:20 PM CDT | Thunderstorm Wind | Sharon, WI |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.0 hours before the alert went out and 209 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
- 2271 J/kg
- Mixed-layer CIN
- -168 J/kg
- Mixed-layer LCL
- 608 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 155 m²/s²
- 0-3 km storm-relative helicity
- 185 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Jul 21, 11:00 AM CDT, 2 hours 1 minute before
WIZ046-047-051-052-056>060-062>072-220200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 11 AM CDT TUE JUL 21 1998 ...SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND TONIGHT... ...FOR SOUTH CENTRAL AND SOUTHEAST WISCONSIN... THREAT...DAMAGING WINDS...LARGE HAIL...HEAVY RAINFALL DISCUSSION... A CLUSTER OF STRONG THUNDERSTORMS MOVING INTO SOUTHWEST WISCONSIN MAY INTENSIFY AS THEY MOVE INTO THE VERY UNSTABLE AIRp OVER THE SOUTHERN THIRD OF THE STATE. ENOUGH MOISTURE IS AVAILABLE TO THE STORMS TO PRODUCE LOCALIZED FLOODING FROM HEAVY RAINFALL. SPOTTER ACTION... STORM SPOTTER GROUPS MAY NEED TO BE ACTIVATED THIS AFTERNOON AND INTO TONIGHT. GARCIA
Special weather statement, Jul 21, 11:00 AM CDT, 2 hours 1 minute before
WIZ046-047-051-052-056>060-062>072-220200- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 11 AM CDT TUE JUL 21 1998 ...SLIGHT RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND TONIGHT... ...FOR SOUTH CENTRAL AND SOUTHEAST WISCONSIN... THREAT...DAMAGING WINDS...LARGE HAIL...HEAVY RAINFALL DISCUSSION... A CLUSTER OF STRONG THUNDERSTORMS MOVING INTO SOUTHWEST WISCONSIN MAY INTENSIFY AS THEY MOVE INTO THE VERY UNSTABLE AIRp OVER THE SOUTHERN THIRD OF THE STATE. ENOUGH MOISTURE IS AVAILABLE TO THE STORMS TO PRODUCE LOCALIZED FLOODING FROM HEAVY RAINFALL. SPOTTER ACTION... STORM SPOTTER GROUPS MAY NEED TO BE ACTIVATED THIS AFTERNOON AND INTO TONIGHT. GARCIA
The office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 10:22 PM CDT | Severe Thunderstorm Warning | MKX | Green Lake | 53 min |
| Jul 20, 10:39 PM CDT | Severe Thunderstorm Warning | MKX | Fond du Lac, Green Lake | 61 min |
| Jul 20, 11:21 PM CDT | Severe Thunderstorm Warning | MKX | Dodge | 64 min |
| Jul 20, 11:49 PM CDT | Severe Thunderstorm Warning | MKX | Washington | 61 min |
| Jul 21, 12:18 AM CDT | Severe Thunderstorm Warning | MKX | Ozaukee | 42 min |
| Jul 21, 1:32 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine | 63 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 1998Every severe thunderstorm warning in 1998
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.