Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 43, NWS Milwaukee, WI
NWS Milwaukee, WI issued this severe thunderstorm warning at Aug 10, 2021, 4:25 PM CDT for Iowa County, Lafayette County, Wisconsin. It was in force for 80 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Aug 10, 2021, 4:25 PM CDT (21:25 UTC)
- Expired
- Aug 10, 2021, 5:45 PM CDT
- In force
- 80 min
- Issued by
- NWS Milwaukee, WI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Iowa County, WI, Lafayette County, WI
The radar
The Milwaukee radar (KMKX), 127 km from the middle of the area, began a volume at 21:26 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 |
|---|---|---|---|
| Aug 10, 4:45 PM CDT | TSTM WND DMG | 7 Sse Mineral Point, WI | LAFAYETTE CO DISPATCH RELAYS REPORT OF TREE DOWN ON OLSON LANE. TIME ESTIMATED FROM RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 10, 3:47 PM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.4 hours before the alert went out and 127 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
- 3755 J/kg
- Mixed-layer CIN
- -67 J/kg
- Mixed-layer LCL
- 819 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- -37 m²/s²
- 0-3 km storm-relative helicity
- 4 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
806 WUUS53 KMKX 102125 SVRMKX WIC049-065-102245- /O.NEW.KMKX.SV.W.0043.210810T2125Z-210810T2245Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Milwaukee/Sullivan WI 425 PM CDT Tue Aug 10 2021 The National Weather Service in Milwaukee/Sullivan has issued a * Severe Thunderstorm Warning for... Lafayette County in south central Wisconsin... Southeastern Iowa County in south central Wisconsin... * Until 545 PM CDT. * At 425 PM CDT, severe thunderstorms were located along a line extending from near Platteville to near Menominee, moving east at 35 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Darlington, Shullsburg, Benton, Argyle, Blanchardville, Wiota, New Diggings, South Wayne, Waldwick, Fayette, Lamont, Hollandale, Gratiot, Calamine, Lead Mine, Yellowstone Lake St Park and Woodford. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4302 8984 4251 8984 4251 9042 4252 9043 TIME...MOT...LOC 2125Z 256DEG 30KT 4278 9053 4244 9056 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...0.75 IN WIND THREAT...RADAR INDICATED MAX WIND GUST...60 MPH $$ KAVINSKY
3 follow-up statements
423
WWUS53 KMKX 102138
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
438 PM CDT Tue Aug 10 2021
WIC049-065-102245-
/O.CON.KMKX.SV.W.0043.000000T0000Z-210810T2245Z/
Lafayette WI-Iowa WI-
438 PM CDT Tue Aug 10 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT
FOR LAFAYETTE AND SOUTHEASTERN IOWA COUNTIES...
At 438 PM CDT, severe thunderstorms were located along a line
extending from near Platteville to near Galena, moving east at 35
mph.
HAZARD...70 mph wind gusts and penny size hail.
SOURCE...Weather observing equipment in Platteville reported a 70
mph wind gust.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Darlington, Shullsburg, Benton, Argyle, Blanchardville, Wiota, New
Diggings, South Wayne, Waldwick, Fayette, Lamont, Hollandale,
Gratiot, Calamine, Lead Mine, Yellowstone Lake St Park and Woodford.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4302 8984 4251 8984 4251 9042 4252 9043
TIME...MOT...LOC 2138Z 270DEG 30KT 4280 9042 4246 9045
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH
$$
KAVINSKY716 WWUS53 KMKX 102217 SVSMKX Severe Weather Statement National Weather Service Milwaukee/Sullivan WI 517 PM CDT Tue Aug 10 2021 WIC049-065-102245- /O.CON.KMKX.SV.W.0043.000000T0000Z-210810T2245Z/ Lafayette WI-Iowa WI- 517 PM CDT Tue Aug 10 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 545 PM CDT FOR LAFAYETTE AND SOUTHEASTERN IOWA COUNTIES... At 517 PM CDT, severe thunderstorms were located along a line extending from near Blanchardville to near Apple River, moving east at 35 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Darlington, Shullsburg, Argyle, Blanchardville, Wiota, New Diggings, South Wayne, Waldwick, Fayette, Lamont, Hollandale, Gratiot, Lead Mine, Yellowstone Lake St Park and Woodford. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. && LAT...LON 4251 8984 4251 9040 4252 9041 4300 8984 TIME...MOT...LOC 2217Z 276DEG 32KT 4286 8986 4247 9015 HAIL THREAT...RADAR INDICATED MAX HAIL SIZE...<.75 IN WIND THREAT...OBSERVED MAX WIND GUST...60 MPH $$ KAVINSKY
529
WWUS53 KMKX 102244
SVSMKX
Severe Weather Statement
National Weather Service Milwaukee/Sullivan WI
544 PM CDT Tue Aug 10 2021
WIC049-065-102254-
/O.EXP.KMKX.SV.W.0043.000000T0000Z-210810T2245Z/
Lafayette WI-Iowa WI-
544 PM CDT Tue Aug 10 2021
...THE SEVERE THUNDERSTORM WARNING FOR LAFAYETTE AND SOUTHEASTERN
IOWA COUNTIES WILL EXPIRE AT 545 PM CDT...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire. However gusty
winds are still possible with these thunderstorms.
A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
south central Wisconsin.
LAT...LON 4251 8984 4251 9040 4252 9041 4300 8984
TIME...MOT...LOC 2244Z 256DEG 30KT 4291 8961 4252 8990
$$
KAVINSKYThe office that day
Everything else NWS Milwaukee, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 7:13 PM CDT | Marine Dense Fog Advisory | MKX | 14 hr | |
| Aug 10, 2:16 PM CDT | Heat Advisory | MKX | Dane, Dodge, Green, Iowa, Jefferson, Kenosha and 8 more | 29 hr |
| Aug 10, 4:02 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Iowa, Lafayette, Sauk | 73 min |
| Aug 10, 5:08 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane, Green, Iowa, Sauk | 67 min |
| Aug 10, 5:36 PM CDT | Special Weather Statement | MKX | Rock | 39 min |
| Aug 10, 5:42 PM CDT | Severe Thunderstorm Warning | MKX | Dane, Dodge, Jefferson, Rock | 78 min |
| Aug 10, 6:08 PM CDT | Severe Thunderstorm Warning | MKX | Dodge, Jefferson, Kenosha, Racine, Walworth, Washington and 1 more | 97 min |
| Aug 10, 6:12 PM CDT | Severe Thunderstorm Warning | MKX | Columbia, Dane | 20 min |
| Aug 10, 6:24 PM CDT | Special Marine Warning | MKX | 111 min | |
| Aug 10, 6:44 PM CDT | Special Weather Statement | MKX | Fond du Lac, Sheboygan | 76 min |
| Aug 10, 6:51 PM CDT | Severe Thunderstorm Warning | MKX | Kenosha, Milwaukee, Ozaukee, Racine | 54 min |
Nearby
Severe Thunderstorm Warnings in Wisconsin, 2021Every severe thunderstorm warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.