Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Green Bay, WI

April 27, 2021Marinette County, Oconto County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Apr 27, 2021, 10:43 AM CDT for Marinette County, Oconto County, Wisconsin. It was in force for 47 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: Apr 27, 2021, 10:43 AM CDT (15:43 UTC)
Expired: Apr 27, 2021, 11:30 AM CDT
In force: 47 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

Counties Marinette County, WI, Oconto County, WI

The radar

The Green Bay radar (KGRB), 96 km from the middle of the area, began a volume at 15:43 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
Apr 27, 10:55 AM CDT	HAIL 0.75	1 Se Mountain, WI
Apr 27, 11:03 AM CDT	HAIL 1	1 W Mountain, WI
Apr 27, 11:10 AM CDT	HAIL 1	3 Nw Middle Inlet, WI

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, 3.7 hours before the alert went out and 98 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 976 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 159 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.0

Open this sounding in Storm Lab

The text

As transmitted.

725 
WUUS53 KGRB 271543
SVRGRB
WIC075-083-271630-
/O.NEW.KGRB.SV.W.0003.210427T1543Z-210427T1630Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
1043 AM CDT Tue Apr 27 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Central Marinette County in northeastern Wisconsin...
  Northern Oconto County in northeastern Wisconsin...

* Until 1130 AM CDT.

* At 1042 AM CDT, a severe thunderstorm was located 12 miles east of 
  McCaslin Mountain Natural Area, or 32 miles northwest of 
  Menominee. Another severe thunderstorm was located around 5 miles 
  southeast of Langlade. The storms were moving northeast at 35 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* Locations impacted include...
  Crivitz, Mountain, Wausaukee, Bear Paw Scout Camp, Middle Inlet,
  Lakewood, Amberg, Athelstane, Boot Lake Campground and Caldron
  Falls Rese.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4529 8770 4512 8859 4512 8864 4520 8864
      4521 8866 4527 8867 4561 8778 4556 8779
      4556 8783 4554 8780 4549 8780 4544 8786
      4540 8785 4535 8789 4536 8787 4534 8785
      4535 8775 4539 8769 4534 8765
TIME...MOT...LOC 1542Z 244DEG 30KT 4532 8822 

HAIL...1.25IN
WIND...<50MPH
 
$$

Eckberg

3 follow-up statements

973 
WWUS53 KGRB 271556
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1056 AM CDT Tue Apr 27 2021

WIC075-083-271630-
/O.CON.KGRB.SV.W.0003.000000T0000Z-210427T1630Z/
Marinette WI-Oconto WI-
1056 AM CDT Tue Apr 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT
FOR CENTRAL MARINETTE AND NORTHERN OCONTO COUNTIES...

At 1056 AM CDT, a severe thunderstorm was located 7 miles west of 
Wausaukee or 27 miles northwest of Menominee. Another severe 
thunderstorm was located near Mountain. The severe thunderstorms 
were moving northeast at 35 mph.

HAZARD...Ping pong ball size hail.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect damage 
         to roofs, siding, windows, and vehicles.

Locations impacted include...
Crivitz, Mountain, Wausaukee, Bear Paw Scout Camp, Middle Inlet,
Lakewood, Amberg, Athelstane, Caldron Falls Rese and Mcallister.

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.

&&

LAT...LON 4529 8770 4512 8859 4512 8864 4520 8864
      4526 8859 4561 8778 4556 8779 4556 8783
      4554 8780 4549 8780 4544 8786 4540 8785
      4535 8789 4536 8787 4534 8785 4535 8775
      4539 8769 4534 8765
TIME...MOT...LOC 1555Z 242DEG 30KT 4534 8810 

HAIL...1.50IN
WIND...<50MPH
 
$$

Eckberg

643 
WWUS53 KGRB 271605
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1105 AM CDT Tue Apr 27 2021

WIC075-083-271630-
/O.CON.KGRB.SV.W.0003.000000T0000Z-210427T1630Z/
Marinette WI-Oconto WI-
1105 AM CDT Tue Apr 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 AM CDT
FOR CENTRAL MARINETTE AND NORTHERN OCONTO COUNTIES...

At 1105 AM CDT, a severe thunderstorm was located over Wausaukee or 
23 miles northwest of Menominee. Another severe thunderstorm was 
located near Mountain. The severe thunderstorms were moving 
northeast at 35 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
Crivitz, Mountain, Wausaukee, Bear Paw Scout Camp, Middle Inlet,
Amberg, Athelstane, Caldron Falls Rese, Mcallister and Governor
Thompson State Park.

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 this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4529 8770 4512 8859 4512 8864 4520 8864
      4525 8855 4561 8778 4556 8779 4556 8783
      4554 8780 4549 8780 4544 8786 4540 8785
      4535 8789 4536 8787 4534 8785 4535 8775
      4539 8769 4534 8765
TIME...MOT...LOC 1603Z 241DEG 30KT 4535 8799 

HAIL...1.00IN
WIND...<50MPH
 
$$

Eckberg

418 
WWUS53 KGRB 271625
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
1125 AM CDT Tue Apr 27 2021

WIC075-083-271634-
/O.EXP.KGRB.SV.W.0003.000000T0000Z-210427T1630Z/
Marinette WI-Oconto WI-
1125 AM CDT Tue Apr 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MARINETTE AND NORTHERN
OCONTO COUNTIES WILL EXPIRE AT 1130 AM CDT...
    
The severe thunderstorms which prompted the warning has weakened.
Therefore, the warning will be allowed to expire. However small hail 
up to penny size and heavy rain are still possible with the cluster
of thunderstorm.

LAT...LON 4529 8770 4512 8859 4512 8864 4520 8864
      4525 8855 4561 8778 4556 8779 4556 8783
      4554 8780 4549 8780 4544 8786 4540 8785
      4535 8789 4536 8787 4534 8785 4535 8775
      4539 8769 4534 8765
TIME...MOT...LOC 1624Z 244DEG 30KT 4542 8778 

$$

Eckberg

The office that day

Everything else NWS Green Bay, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 27, 5:10 AM CDT	Special Weather Statement	GRB	Langlade, Lincoln	65 min
Apr 27, 5:33 AM CDT	Special Weather Statement	GRB	Forest, Langlade, Menominee	42 min
Apr 27, 6:13 AM CDT	Special Weather Statement	GRB	Marinette, Menominee, Oconto	47 min
Apr 27, 10:01 AM CDT	Special Weather Statement	GRB	Marinette	44 min
Apr 27, 10:36 AM CDT	Special Weather Statement	GRB	Marinette	54 min
Apr 27, 11:50 AM CDT	Areal Flood Advisory	GRB	Marinette, Menominee, Oconto	3 hr
Apr 27, 12:00 PM CDT	Severe Thunderstorm Warning	GRB	Marinette	22 min
Apr 27, 12:20 PM CDT	Special Weather Statement	GRB	Menominee	40 min
Apr 27, 1:41 PM CDT	Special Weather Statement	GRB	Door	49 min
Apr 27, 6:16 PM CDT	Areal Flood Advisory	GRB	Langlade, Marinette, Menominee, Oconto	3 hr
Apr 27, 6:41 PM CDT	Special Weather Statement	GRB	Langlade, Lincoln, Marathon, Wood	64 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Every 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.