Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 52, NWS Green Bay, WI

July 27, 2021Door County, Kewaunee County, Wisconsin

NWS Green Bay, WI issued this severe thunderstorm warning at Jul 27, 2021, 12:51 AM CDT for Door County, Kewaunee County, Wisconsin. It was in force for 54 min. 5 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: Jul 27, 2021, 12:51 AM CDT (05:51 UTC)
Expired: Jul 27, 2021, 1:45 AM CDT
In force: 54 min
Issued by: NWS Green Bay, WI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Door County, WI, Kewaunee County, WI

The radar

The Green Bay radar (KGRB), 79 km from the middle of the area, began a volume at 05:51 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 27, 1:09 AM CDT	TSTM WND DMG	Rosiere, WI	TREES AND POWER LINES DOWN. TIME ESTIMATED BY RADAR. SCATTERED WIND DAMAGE NOTED ACROSS THE NORTHERN HALF OF THE COUNTY.
Jul 27, 1:10 AM CDT	TSTM WND DMG	Sturgeon Bay, WI	SCATTERED TREES AND POWER LINES DOWN ACROSS THE COUNTY. TIME ESTIMATED BY RADAR.
Jul 27, 1:10 AM CDT	TSTM WND GST 52	Sturgeon Bay, WI	45 KNOTS MEASURED AT THE STURGEON BAY AIRPORT.
Jul 27, 1:18 AM CDT	MARINE TSTM WIND 52	Ne Kewaunee, WI	45 KNOTS MEASURED AT KWNW3 BUOY.
Jul 27, 1:30 AM CDT	MARINE TSTM WIND 44	4 N Newport State Park, WI	38 KNOTS MEASURED AT NORTHPORT PIER.

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 00:00Z, 5.9 hours before the alert went out and 80 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: 591 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 2073 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 100 m²/s²
0-3 km storm-relative helicity: 109 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 3.0

Open this sounding in Storm Lab

The text

As transmitted.

573 
WUUS53 KGRB 270551
SVRGRB
WIC029-061-270645-
/O.NEW.KGRB.SV.W.0052.210727T0551Z-210727T0645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Green Bay WI
1251 AM CDT Tue Jul 27 2021

The National Weather Service in Green Bay has issued a

* Severe Thunderstorm Warning for...
  Kewaunee County in northeastern Wisconsin...
  Door County in northeastern Wisconsin...

* Until 145 AM CDT.

* At 1251 AM CDT, severe thunderstorms were located along a line
  extending from 6 miles east of Menominee to near Bay Shore Park to
  Kaukauna, moving southeast at 55 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Luxemburg around 100 AM CDT.
  Egg Harbor around 105 AM CDT.
  Kewaunee and Jacksonport around 110 AM CDT.

Other locations impacted by these severe thunderstorms include Krok,
Peninsula State Park, Valmy, Curran, Slovan, Gregorville, Rankin,
Rock Island State Park, Carlsville and Vignes.

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.

Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4475 8727 4432 8748 4433 8777 4468 8780
      4490 8756 4493 8745 4497 8743 4501 8755
      4494 8762 4510 8753 4502 8754 4498 8742
      4508 8736 4517 8744 4524 8734 4522 8721
      4541 8698 4543 8682 4538 8676
TIME...MOT...LOC 0551Z 300DEG 47KT 4514 8749 4457 8787 4429 8827 

HAIL...<.75IN
WIND...60MPH
 
$$

Kurimski

3 follow-up statements

638 
WWUS53 KGRB 270608
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
108 AM CDT Tue Jul 27 2021

WIC029-061-270645-
/O.CON.KGRB.SV.W.0052.000000T0000Z-210727T0645Z/
Kewaunee WI-Door WI-
108 AM CDT Tue Jul 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR KEWAUNEE AND DOOR COUNTIES...

At 108 AM CDT, severe thunderstorms were located along a line
extending from near Egg Harbor to near Kewaunee to near Brillion,
moving southeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Sturgeon Bay, Kewaunee, Algoma, Luxemburg, Jacksonport, Ephraim, Egg
Harbor, Newport State Park, Whitefish Bay and Brussels.

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 4475 8727 4454 8741 4432 8748 4433 8777
      4469 8776 4501 8755 4494 8762 4510 8753
      4502 8755 4497 8743 4508 8736 4517 8744
      4524 8734 4522 8721 4533 8707 4534 8701
      4541 8698 4540 8684 4543 8682 4538 8676
TIME...MOT...LOC 0608Z 300DEG 47KT 4503 8723 4446 8761 4418 8801 

HAIL...<.75IN
WIND...60MPH
 
$$

Kurimski

696 
WWUS53 KGRB 270626
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
126 AM CDT Tue Jul 27 2021

WIC029-061-270645-
/O.CON.KGRB.SV.W.0052.000000T0000Z-210727T0645Z/
Kewaunee WI-Door WI-
126 AM CDT Tue Jul 27 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 AM CDT
FOR KEWAUNEE AND DOOR COUNTIES...

At 126 AM CDT, severe thunderstorms were located along a line
extending from 12 miles east of Jacksonport to 12 miles east of Two
Creeks to near Manitowoc, moving southeast at 55 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Sturgeon Bay, Kewaunee, Algoma, Jacksonport, Ephraim, Egg Harbor,
Newport State Park, Whitefish Bay, Baileys Harbor and Sister Bay.

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 4525 8690 4519 8692 4517 8697 4513 8696
      4501 8710 4493 8712 4475 8727 4454 8741
      4432 8748 4433 8777 4517 8730 4520 8723
      4533 8707 4534 8701 4541 8698 4540 8684
      4543 8682 4538 8676
TIME...MOT...LOC 0626Z 300DEG 47KT 4491 8695 4434 8733 4406 8773 

HAIL...<.75IN
WIND...60MPH
 
$$

Kurimski

587 
WWUS53 KGRB 270635
SVSGRB

Severe Weather Statement
National Weather Service Green Bay WI
135 AM CDT Tue Jul 27 2021

WIC029-061-270645-
/O.EXP.KGRB.SV.W.0052.000000T0000Z-210727T0645Z/
Kewaunee WI-Door WI-
135 AM CDT Tue Jul 27 2021

...THE SEVERE THUNDERSTORM WARNING FOR KEWAUNEE AND DOOR COUNTIES
WILL EXPIRE AT 145 AM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However heavy rain
is still possible with these thunderstorms.

LAT...LON 4525 8690 4519 8692 4517 8697 4513 8696
      4501 8710 4493 8712 4475 8727 4454 8741
      4432 8748 4433 8777 4517 8730 4520 8723
      4533 8707 4534 8701 4541 8698 4540 8684
      4543 8682 4538 8676
TIME...MOT...LOC 0635Z 300DEG 47KT 4491 8695 4434 8733 4406 8773 

$$

Kurimski

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 26, 8:26 PM CDT	Special Weather Statement	GRB	Door	49 min
Jul 26, 8:33 PM CDT	Special Marine Warning	GRB		36 min
Jul 26, 9:43 PM CDT	Special Weather Statement	GRB	Vilas	62 min
Jul 26, 10:30 PM CDT	Severe Thunderstorm Warning	GRB	Forest, Vilas	50 min
Jul 26, 10:37 PM CDT	Special Weather Statement	GRB	Langlade, Lincoln	53 min
Jul 26, 10:45 PM CDT	Severe Thunderstorm Warning	GRB	Lincoln, Oneida	45 min
Jul 26, 11:06 PM CDT	Severe Thunderstorm Warning	GRB	Florence	54 min
Jul 26, 11:11 PM CDT	Severe Thunderstorm Warning	GRB	Florence, Forest, Langlade, Lincoln, Marathon, Oneida	49 min
Jul 26, 11:33 PM CDT	Severe Thunderstorm Warning	GRB	Marinette, Menominee, Oconto, Shawano	57 min
Jul 26, 11:39 PM CDT	Special Weather Statement	GRB	Marinette	36 min
Jul 26, 11:58 PM CDT	Severe Thunderstorm Warning	GRB	Marathon, Outagamie, Portage, Waupaca	62 min
Jul 27, 12:16 AM CDT	Special Marine Warning	GRB		89 min
Jul 27, 12:24 AM CDT	Severe Thunderstorm Warning	GRB	Brown, Marinette, Oconto, Shawano	66 min
Jul 27, 12:37 AM CDT	Special Marine Warning	GRB		83 min
Jul 27, 12:52 AM CDT	Special Weather Statement	GRB	Calumet, Winnebago	38 min
Jul 27, 12:55 AM CDT	Special Weather Statement	GRB	Manitowoc	35 min
Jul 27, 1:18 AM CDT	Special Weather Statement	GRB	Oneida	42 min
Jul 27, 1:28 AM CDT	Severe Thunderstorm Warning	GRB	Oneida	32 min
Jul 27, 1:42 AM CDT	Special Weather Statement	GRB	Manitowoc	48 min
Jul 27, 1:53 AM CDT	Special Weather Statement	GRB	Lincoln	52 min
Jul 27, 2:30 AM CDT	Special Weather Statement	GRB	Langlade	45 min
Jul 27, 2:41 AM CDT	Special Weather Statement	GRB	Langlade, Lincoln, Marathon, Menominee, Shawano	49 min
Jul 27, 3:20 AM CDT	Special Weather Statement	GRB	Brown, Marathon, Menominee, Outagamie, Portage, Shawano and 2 more	40 min
Jul 27, 3:51 AM CDT	Special Weather Statement	GRB	Brown, Calumet, Kewaunee, Manitowoc, Marathon, Outagamie and 6 more	69 min
Jul 27, 6:16 AM CDT	Special Weather Statement	GRB	Portage, Wood	44 min
Jul 27, 6:58 AM CDT	Special Weather Statement	GRB	Portage, Wood	47 min
Jul 27, 7:27 AM CDT	Special Weather Statement	GRB	Waushara	63 min
Jul 27, 8:33 AM CDT	Special Weather Statement	GRB	Calumet, Manitowoc, Portage, Waushara, Winnebago, Wood	57 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.