Alert archive / Wisconsin / Severe Thunderstorm Warnings in 1999
Severe Thunderstorm Warning 5, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Feb 11, 1999, 2:23 PM CST for Jefferson County, Walworth County, Wisconsin. It was in force for 32 min. 4 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
- Feb 11, 1999, 2:23 PM CST (20:23 UTC)
- Expired
- Feb 11, 1999, 2:55 PM CST
- In force
- 32 min
- Issued by
- NWS Milwaukee, WI
- Area
- Whole counties
Counties Jefferson County, WI, Walworth County, WI
The radar
The Milwaukee radar (KMKX), 16 km from the middle of the area, began a volume at 20:26 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Feb 11, 2:23 PM CST | Thunderstorm Wind 56 | Lake Mills, WI | |
| Feb 11, 2:40 PM CST | Thunderstorm Wind | Whitewater, WI | |
| Feb 11, 2:45 PM CST | Thunderstorm Wind | Palmyra, WI | |
| Feb 11, 2:45 PM CST | Thunderstorm Wind | Walworth, 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 |
|---|---|---|---|
| Feb 11, 1:00 PM CST | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 8.4 hours before the alert went out and 187 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 526 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 62 m²/s²
- 0-3 km storm-relative helicity
- 207 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, Feb 11, 12:15 PM CST, 2 hours 8 minutes before
WIZ046-047-051-052-056>060-062>072-112100- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE MILWAUKEE/SULLIVAN WI 1215 PM CST THU FEB 11 1999 ...SEVERE WEATHER OUTLOOK FOR SOUTH CENTRAL AND SOUTHEAST WISCONSIN... SEVERE THUNDERSTORMS ARE EXPECTED TO DEVELOP AFTER 300 PM CST ACROSS SOUTHEAST AND SOUTH CENTRAL WISCONSIN. DAMAGING WINDS ARE EXPECTED WITH THESE STORMS. A COLD FRONT MOVING EAST ACROSS WISCONSIN...COMBINED WITH MOIST UNSTABLE AIR AND A STRONG JET STREAM AT THE UPPER LEVELS...WILL PRODUCE SEVERE STORMS THIS AFTERNOON. STAY TUNED TO NOAA WEATHER RADIO AND LOCAL TELEVISION AND RADIO FOR LATER WATCHES...WARNINGS AND STATEMENTS. EISE WWW.CRH.NOAA.GOV/MKX
The office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 11, 12:26 PM CST | Severe Thunderstorm Warning | MKX | Iowa, Lafayette | 64 min |
| Feb 11, 1:12 PM CST | Severe Thunderstorm Warning | MKX | Sauk | 33 min |
| Feb 11, 1:31 PM CST | Severe Thunderstorm Warning | MKX | Columbia | 44 min |
| Feb 11, 1:41 PM CST | Severe Thunderstorm Warning | MKX | Green Lake, Marquette | 64 min |
| Feb 11, 2:30 PM CST | Severe Thunderstorm Warning | MKX | Dodge, Waukesha | 45 min |
| Feb 11, 2:40 PM CST | Severe Thunderstorm Warning | MKX | Washington | 40 min |
| Feb 11, 2:58 PM CST | Severe Thunderstorm Warning | MKX | Kenosha, Milwaukee, Racine | 32 min |
| Feb 11, 3:01 PM CST | Severe Thunderstorm Warning | MKX | Ozaukee, Sheboygan | 34 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 1999Every severe thunderstorm warning in 1999
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.