Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1998
Severe Thunderstorm Warning 106, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Jul 20, 1998, 5:55 PM CDT for Lafayette County, Wisconsin. It was in force for 65 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, 5:55 PM CDT (22:55 UTC)
- Expired
- Jul 20, 1998, 7:00 PM CDT
- In force
- 65 min
- Issued by
- NWS Milwaukee, WI
- Area
- Whole counties
County Lafayette County, WI
The radar
The Quad Cities radar (KDVN), 122 km from the middle of the area, began a volume at 22:55 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 20, 6:10 PM CDT | Thunderstorm Wind | Argyle, WI | |
| Jul 20, 6:15 PM CDT | Thunderstorm Wind | South Wayne, 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, 10.9 hours before the alert went out and 120 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.
307 WUUS1 KMKE 202257 RRA SVRMKE WIC025-065-210000- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 555 PM CDT MON JUL 20 1998 THE NATIONAL WEATHER SERVICE IN MILWAUKEE/SULLIVAN WI HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... DANE COUNTY IN SOUTH CENTRAL WISCONSIN LAFAYETTE COUNTY IN SOUTH CENTRAL WISCONSIN * UNTIL 700 PM CDT * AT 555 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A LINE OF SEVERE THUNDERSTORMS EXTENDING FROM REEDSBURG IN SAUK COUNTY TO LANCASTER IN GRANT COUNTY...MOVING SOUTHEAST AT 40 MPH. THE LINE OF SEVERE THUNDERSTORMS HAS PRODUCED WINDS OF 60 TO 80 MPH. 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. JDH/DAVIS
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, 5 hours 25 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, 5 hours 25 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, 5:18 PM CDT | Severe Thunderstorm Warning | MKX | Iowa, Sauk | 72 min |
| Jul 20, 5:55 PM CDT | Severe Thunderstorm Warning | MKX | Dane | 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; radar from the NEXRAD Level II archive.