Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 104, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 20, 1998, 5:18 PM CDT for Iowa County, Sauk County, Wisconsin. It was in force for 72 min. 2 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 20, 1998, 5:18 PM CDT (22:18 UTC)
- Expired
- Jul 20, 1998, 6:30 PM CDT
- In force
- 72 min
- Issued by
- NWS Milwaukee, WI
- Area
- Whole counties
Counties Iowa County, WI, Sauk County, WI
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jul 20, 5:40 PM CDT | Thunderstorm Wind | Plain, WI | |
| Jul 20, 6:10 PM CDT | Thunderstorm Wind | Lake Delton, 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jul 20, 4:00 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.3 hours before the alert went out and 181 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
- 1102 J/kg
- Mixed-layer CIN
- -200 J/kg
- Mixed-layer LCL
- 1216 m above ground
- 0-6 km bulk shear
- 23 kt
- 0-1 km storm-relative helicity
- 9 m²/s²
- 0-3 km storm-relative helicity
- 95 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
044 WUUS1 KMKE 202220 RRA SVRMKE WIC049-111-202330- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 518 PM CDT MON JUL 20 1998 THE NATIONAL WEATHER SERVICE IN MILWAUKEE/SULLIVAN WI HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... IOWA COUNTY IN SOUTH CENTRAL WISCONSIN SAUK COUNTY IN SOUTH CENTRAL WISCONSIN * UNTIL 630 PM CDT * AT 515 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS EXTENDING FROM VIROQUA IN VERNON COUNTY TO STEUBEN IN CRAWFORD COUNTY... MOVING SOUTHEAST AT 40 MPH. THE LINE OF SEVERE THUNDERSTORMS HAS PRODUCED HURRICANE WINDS OF 92 MPH IN MOUNT STERLING IN CRAWFORD COUNTY IF YOU ARE IN THESE AREAS... SEEK SAFETY IN A SMALL INTERIOR ROOM AWAY FROM WINDOWS. A BASEMENT OFFERS THE BEST PROTECTION. SEVERE THUNDERSTORMS WILL OCCASIONALLY PRODUCE TORNADOES. JH/KRR
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 20, 12:30 PM CDT, 4 hours 48 minutes before
WIZ046-047-051-052-056>060-062>072-211000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1230 PM CDT MON JUL 20 1998 ...SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT... ...FOR SOUTH CENTRAL AND SOUTHEAST WISCONSIN... THREAT...DAMAGING WINDS AND LARGE HAIL DISCUSSION... A WARM FRONT LIFTING NORTH FROM IOWA IS EXPECTED TO INTERACT WITH A FAST WEST-EAST JET STREAM ALOFT AND A COOL FRONT TO PRODUCE A LINE OF STRONG TO SEVERE THUNDERSTORMS TONIGHT. SPOTTER ACTION... STORM SPOTTER GROUPS MAY NEED TO BE ACTIVATED TOWARDS EVENING AND DURING THE OVERNIGHT HOURS.
Special weather statement, Jul 20, 12:30 PM CDT, 4 hours 48 minutes before
WIZ046-047-051-052-056>060-062>072-211000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1230 PM CDT MON JUL 20 1998 ...SLIGHT RISK OF SEVERE THUNDERSTORMS TONIGHT... ...FOR SOUTH CENTRAL AND SOUTHEAST WISCONSIN... THREAT...DAMAGING WINDS AND LARGE HAIL DISCUSSION... A WARM FRONT LIFTING NORTH FROM IOWA IS EXPECTED TO INTERACT WITH A FAST WEST-EAST JET STREAM ALOFT AND A COOL FRONT TO PRODUCE A LINE OF STRONG TO SEVERE THUNDERSTORMS TONIGHT. SPOTTER ACTION... STORM SPOTTER GROUPS MAY NEED TO BE ACTIVATED TOWARDS EVENING AND DURING THE OVERNIGHT HOURS.
The office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 20, 5:55 PM CDT | Severe Thunderstorm Warning | MKX | Dane | 65 min |
| Jul 20, 5:55 PM CDT | Severe Thunderstorm Warning | MKX | Lafayette | 65 min |
| Jul 20, 6:29 PM CDT | Severe Thunderstorm Warning | MKX | Jefferson, Waukesha | 61 min |
| Jul 20, 6:33 PM CDT | Severe Thunderstorm Warning | MKX | Rock | 62 min |
| Jul 20, 6:42 PM CDT | Severe Thunderstorm Warning | MKX | Milwaukee | 48 min |
| Jul 20, 6:48 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Racine, Walworth | 72 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.