Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 38, NWS Green Bay, WI
NWS Green Bay, WI issued this severe thunderstorm warning at Jul 6, 2021, 4:28 PM CDT for Marathon County, Portage County, Wood County, Wisconsin. It was in force for 62 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
- Jul 6, 2021, 4:28 PM CDT (21:28 UTC)
- Expired
- Jul 6, 2021, 5:30 PM CDT
- In force
- 62 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Marathon County, WI, Portage County, WI, Wood County, WI
The radar
The La Crosse radar (KARX), 139 km from the middle of the area, began a volume at 21:33 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 6, 4:28 PM CDT | TSTM WND GST 63 | Marshfield, WI |
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 |
|---|---|---|---|
| Jul 6, 2:01 PM CDT | Severe Thunderstorm Watch | SPC | 8 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 9.5 hours before the alert went out and 143 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
- 34 J/kg
- Mixed-layer CIN
- -188 J/kg
- Mixed-layer LCL
- 1667 m above ground
- 0-6 km bulk shear
- 37 kt
- 0-1 km storm-relative helicity
- 25 m²/s²
- 0-3 km storm-relative helicity
- 49 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
160 WUUS53 KGRB 062128 SVRGRB WIC073-097-141-062230- /O.NEW.KGRB.SV.W.0038.210706T2128Z-210706T2230Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Green Bay WI 428 PM CDT Tue Jul 6 2021 The National Weather Service in Green Bay has issued a * Severe Thunderstorm Warning for... Wood County in central Wisconsin... Portage County in central Wisconsin... Southern Marathon County in central Wisconsin... * Until 530 PM CDT. * At 427 PM CDT, severe thunderstorms were located along a line extending from 15 miles east of Spencer to 11 miles east of Marshfield to 13 miles northwest of Wisconsin Rapids to Pittsville, moving east at 45 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Severe thunderstorms will be near... Wisconsin Rapids around 445 PM CDT. Other locations in the path of these severe thunderstorms include Mosinee, Lake Wazeecha, Stevens Point, Weston, Whiting, Bevent and Amherst. PRECAUTIONARY/PREPAREDNESS ACTIONS... Prepare immediately for small hail and damaging winds. People outside should move immediately to shelter inside a strong building. Stay away from windows. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4493 9032 4493 8923 4424 8923 4425 9032 TIME...MOT...LOC 2127Z 270DEG 38KT 4484 9000 4470 8994 4457 8994 4443 9012 HAIL...0.75IN WIND...60MPH $$ Kallas
2 follow-up statements
207 WWUS53 KGRB 062152 SVSGRB Severe Weather Statement National Weather Service Green Bay WI 452 PM CDT Tue Jul 6 2021 WIC073-097-141-062230- /O.CON.KGRB.SV.W.0038.000000T0000Z-210706T2230Z/ Wood WI-Portage WI-Marathon WI- 452 PM CDT Tue Jul 6 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR WOOD...PORTAGE AND SOUTHERN MARATHON COUNTIES... At 450 PM CDT, severe thunderstorms were located along a line extending from near Mosinee to 12 miles west of Bevent to near Stevens Point to near Wisconsin Rapids, moving east at 50 mph. A wind gust of 63 mph was reported at the Marshfield Municipal Airport in Marshfield. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. Locations impacted include... Stevens Point, Weston, Whiting, Bevent and Amherst. PRECAUTIONARY/PREPAREDNESS ACTIONS... Prepare immediately for large hail and damaging winds. People outside should move to a shelter, inside a strong building and away from windows. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4493 9016 4493 8923 4424 8923 4425 9016 TIME...MOT...LOC 2150Z 266DEG 43KT 4484 8969 4470 8963 4457 8963 4443 8981 HAIL...0.75IN WIND...60MPH $$ Kallas
439 WWUS53 KGRB 062214 SVSGRB Severe Weather Statement National Weather Service Green Bay WI 514 PM CDT Tue Jul 6 2021 WIC073-097-141-062230- /O.CON.KGRB.SV.W.0038.000000T0000Z-210706T2230Z/ Wood WI-Portage WI-Marathon WI- 514 PM CDT Tue Jul 6 2021 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR EASTERN WOOD...PORTAGE AND SOUTHEASTERN MARATHON COUNTIES... At 512 PM CDT, severe thunderstorms were located along a line extending from near Wittenberg to 8 miles northeast of Stevens Point to 8 miles south of Lake Wazeecha, moving east at 45 mph. HAZARD...60 mph wind gusts and penny size hail. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. These severe thunderstorms will remain over mainly rural areas of eastern Wood, Portage and southeastern Marathon Counties, including the following locations... Big Eau Pleine County Park, Moon, Coddington, Kellner, Ellis, Nelsonville, Custer, Knowlton, Ringle and Rosholt. PRECAUTIONARY/PREPAREDNESS ACTIONS... Prepare immediately for small hail and damaging winds. People outside should move to a shelter, inside a strong building and away from windows. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 4493 8981 4493 8923 4424 8923 4425 8995 TIME...MOT...LOC 2212Z 273DEG 41KT 4484 8928 4458 8940 4425 8971 HAIL...0.75IN WIND...60MPH $$ Kallas
The office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 5, 7:11 PM CDT | Special Weather Statement | GRB | Marathon | 49 min |
| Jul 5, 8:03 PM CDT | Special Weather Statement | GRB | Outagamie | 27 min |
| Jul 5, 8:23 PM CDT | Special Weather Statement | GRB | Calumet, Outagamie, Winnebago | 52 min |
| Jul 6, 4:13 AM CDT | Beach Hazards Statement | GRB | Kewaunee, Manitowoc | 60 hr |
| Jul 6, 4:28 AM CDT | Small Craft Advisory | GRB | 60 hr | |
| Jul 6, 1:34 PM CDT | Special Marine Warning | GRB | 41 min | |
| Jul 6, 1:36 PM CDT | Special Weather Statement | GRB | Brown, Calumet, Kewaunee, Manitowoc, Outagamie, Shawano and 1 more | 54 min |
| Jul 6, 2:29 PM CDT | Special Weather Statement | GRB | Brown, Calumet, Kewaunee, Manitowoc, Oconto, Outagamie and 2 more | 46 min |
| Jul 6, 3:14 PM CDT | Special Weather Statement | GRB | Outagamie | 46 min |
| Jul 6, 3:16 PM CDT | Special Weather Statement | GRB | Brown, Manitowoc | 44 min |
| Jul 6, 3:18 PM CDT | Special Weather Statement | GRB | Kewaunee | 42 min |
| Jul 6, 3:21 PM CDT | Special Weather Statement | GRB | Portage | 39 min |
| Jul 6, 3:27 PM CDT | Special Weather Statement | GRB | Wood | 78 min |
| Jul 6, 3:35 PM CDT | Special Weather Statement | GRB | Langlade | 40 min |
| Jul 6, 3:38 PM CDT | Severe Thunderstorm Warning | GRB | Marathon, Wood | 52 min |
| Jul 6, 3:45 PM CDT | Special Weather Statement | GRB | Calumet | 45 min |
| Jul 6, 3:52 PM CDT | Special Weather Statement | GRB | Outagamie | 53 min |
| Jul 6, 4:03 PM CDT | Special Weather Statement | GRB | Menominee | 42 min |
| Jul 6, 4:29 PM CDT | Special Weather Statement | GRB | Calumet | 46 min |
| Jul 6, 4:44 PM CDT | Special Weather Statement | GRB | Menominee | 46 min |
| Jul 6, 4:55 PM CDT | Special Weather Statement | GRB | Oconto | 50 min |
| Jul 6, 4:59 PM CDT | Special Weather Statement | GRB | Calumet | 46 min |
| Jul 6, 5:11 PM CDT | Areal Flood Advisory | GRB | Marathon, Portage, Shawano, Waupaca, Wood | 3 hr |
| Jul 6, 5:27 PM CDT | Severe Thunderstorm Warning | GRB | Marathon, Portage, Shawano, Waupaca, Waushara, Wood | 48 min |
| Jul 6, 5:56 PM CDT | Special Weather Statement | GRB | Portage | 49 min |
| Jul 6, 6:14 PM CDT | Special Weather Statement | GRB | Winnebago | 46 min |
| Jul 6, 6:21 PM CDT | Areal Flood Advisory | GRB | Calumet, Outagamie, Winnebago | 3 hr |
| Jul 6, 6:25 PM CDT | Special Weather Statement | GRB | Marathon | 50 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.