Alert archive / Wisconsin / Tornado Warnings in 2020
Tornado Warning 1, NWS Green Bay, WI
NWS Green Bay, WI issued this tornado warning at Jun 20, 2020, 5:07 PM CDT for Winnebago County, Wisconsin. It was in force for 9 min. 3 reports 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
- Jun 20, 2020, 5:07 PM CDT (22:07 UTC)
- Expired
- Jun 20, 2020, 5:16 PM CDT
- In force
- 9 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 0.75 in
County Winnebago County, WI
The radar
The Green Bay radar (KGRB), 53 km from the middle of the area, began a volume at 22:11 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 |
|---|---|---|---|
| Jun 20, 5:09 PM CDT | FUNNEL CLOUD | 2 W Allenville, WI | FUNNEL DROPPED OUT OF WALL CLOUD, WAS PRESENT BRIEFLY, THEN WENT BACK TO THE WALL CLOUD. WAS NOT ABLE TO CONFIRM CONTACT WITH GROUND OR NOT |
| Jun 20, 5:09 PM CDT | FUNNEL CLOUD | 2 W Allenville, WI | FUNNEL DROPPED OUT OF WALL CLOUD, WAS PRESENT BRIEFLY, THEN WENT BACK TO THE WALL CLOUD. WAS NOT ABLE TO CONFIRM CONTACT WITH GROUND OR NOT. |
| Jun 20, 5:26 PM CDT | TORNADO | 1 E Butte Des Morts, WI | STORM CHASER PROVIDED PICTURE OF TORNADO TOUCHDOWN ON COUNTY ROAD S NEAR LAKE BUTTE DES MORTS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 10.1 hours before the alert went out and 52 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
- 103 J/kg
- Mixed-layer CIN
- -56 J/kg
- Mixed-layer LCL
- 1063 m above ground
- 0-6 km bulk shear
- 24 kt
- 0-1 km storm-relative helicity
- 140 m²/s²
- 0-3 km storm-relative helicity
- 144 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted.
253
WFUS53 KGRB 202207
TORGRB
WIC139-202230-
/O.NEW.KGRB.TO.W.0001.200620T2207Z-200620T2230Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
507 PM CDT Sat Jun 20 2020
The National Weather Service in Green Bay has issued a
* Tornado Warning for...
Northern Winnebago County in east central Wisconsin...
* Until 530 PM CDT.
* At 506 PM CDT, a severe thunderstorm capable of producing a
tornado was located 8 miles northwest of Oshkosh, moving northeast
at 20 mph.
HAZARD...Tornado.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed.
Damage to roofs, windows, and vehicles will occur. Tree
damage is likely.
* This dangerous storm will be near...
Menasha around 530 PM CDT.
Other locations impacted by this tornadic thunderstorm include Butte
Des Morts, Highland Shore, Larsen, Lake Butte Des Morts, Uw Fox
Valley, Rivermoor, Winneconne, Clarks Point, Allenville and Lake
Butte Des Mor.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4414 8879 4424 8869 4425 8841 4424 8840
4412 8841 4401 8861
TIME...MOT...LOC 2206Z 224DEG 13KT 4413 8863
TORNADO...RADAR INDICATED
HAIL...<.75IN
$$
RDM1 follow-up statement
125
WWUS53 KGRB 202216
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
516 PM CDT Sat Jun 20 2020
WIC139-202226-
/O.CAN.KGRB.TO.W.0001.000000T0000Z-200620T2230Z/
Winnebago WI-
516 PM CDT Sat Jun 20 2020
...THE TORNADO WARNING FOR NORTHERN WINNEBAGO COUNTY IS CANCELLED...
The tornado threat has diminished for the immediate future and the
Tornado Warning has been cancelled. However, damaging winds remain
likely and a Severe Thunderstorm Warning remains in effect for the
area.
LAT...LON 4414 8879 4424 8869 4425 8841 4424 8840
4412 8841 4401 8861
TIME...MOT...LOC 2215Z 224DEG 13KT 4416 8859
$$
RDMThe office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 8:41 AM CDT | Special Weather Statement | GRB | Portage | 49 min |
| Jun 20, 9:21 AM CDT | Areal Flood Advisory | GRB | Langlade, Marathon, Portage, Shawano, Wood | 4 hr |
| Jun 20, 9:25 AM CDT | Special Weather Statement | GRB | Portage | 50 min |
| Jun 20, 10:41 AM CDT | Areal Flood Advisory | GRB | Florence, Forest, Langlade, Lincoln, Oneida, Shawano | 5 hr |
| Jun 20, 10:52 AM CDT | Special Weather Statement | GRB | Portage | 38 min |
| Jun 20, 2:12 PM CDT | Special Weather Statement | GRB | Kewaunee, Manitowoc | 33 min |
| Jun 20, 3:29 PM CDT | Special Weather Statement | GRB | Outagamie, Waupaca | 46 min |
| Jun 20, 4:15 PM CDT | Special Weather Statement | GRB | Outagamie, Shawano, Waupaca | 45 min |
| Jun 20, 4:29 PM CDT | Special Weather Statement | GRB | Winnebago | 46 min |
| Jun 20, 4:44 PM CDT | Severe Thunderstorm Warning | GRB | Winnebago | 35 min |
| Jun 20, 5:18 PM CDT | Special Weather Statement | GRB | Outagamie | 42 min |
| Jun 20, 5:33 PM CDT | Special Weather Statement | GRB | Winnebago | 27 min |
| Jun 20, 5:49 PM CDT | Severe Thunderstorm Warning | GRB | Calumet, Winnebago | 26 min |
| Jun 20, 6:37 PM CDT | Special Weather Statement | GRB | Brown | 38 min |
Nearby
Tornado Warnings in Wisconsin, 2020Every tornado warning in 2020Tornadoes in 2020
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.