Alert archive / Wisconsin / Tornado Warnings in 2026
Tornado Warning 24, NWS Green Bay, WI
NWS Green Bay, WI issued this tornado warning at Jul 27, 2026, 11:59 AM CDT for 4 counties in Wisconsin. It was in force for 46 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 27, 2026, 11:59 AM CDT (16:59 UTC)
- Expired
- Jul 27, 2026, 12:45 PM CDT
- In force
- 46 min
- Issued by
- NWS Green Bay, WI
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 3.0 in
Counties Calumet County, WI, Manitowoc County, WI, Outagamie County, WI, Winnebago County, WI
The radar
The Green Bay radar (KGRB), 50 km from the middle of the area, began a volume at 16:59 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, 12:05 PM CDT | HAIL 1 | 1 Ne Darboy, WI | Report from former NWS meteorologist. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this tornado warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
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 27, 8:43 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 5.0 hours before the alert went out and 48 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
- 3288 J/kg
- Mixed-layer CIN
- -36 J/kg
- Mixed-layer LCL
- 750 m above ground
- 0-6 km bulk shear
- 52 kt
- 0-1 km storm-relative helicity
- 106 m²/s²
- 0-3 km storm-relative helicity
- 347 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 34.3
The text
As transmitted.
063
WFUS53 KGRB 271659
TORGRB
WIC015-071-087-139-271745-
/O.NEW.KGRB.TO.W.0024.260727T1659Z-260727T1745Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Green Bay WI
1159 AM CDT Mon Jul 27 2026
The National Weather Service in Green Bay has issued a
* Tornado Warning for...
Calumet County in east central Wisconsin...
Southwestern Manitowoc County in east central Wisconsin...
Northeastern Winnebago County in east central Wisconsin...
South Central Outagamie County in northeastern Wisconsin...
* Until 1245 PM CDT.
* At 1159 AM CDT, a severe thunderstorm capable of producing a
tornado was located over Appleton, moving southeast at 40 mph.
HAZARD...Tornado and three inch hail.
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 tornado will be near...
Appleton, Menasha, Kimberly and Little Chute around 1200 PM CDT.
Darboy and Kaukauna around 1205 PM CDT. Northern Lake Winnebago and
High Cliff State Park around 1210 PM CDT. Central Lake Winnebago
around 1215 PM CDT. Chilton around 1225 PM CDT. St Anna and Camp
Rokilio Scout Camp around 1240 PM CDT.
Other locations impacted by the tornado include Uw Fox Valley,
Combined Locks, Neenah, Sherwood, Harrison, Stockbridge, St John,
Kloten, Hilbert and Brant.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from 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 4428 8854 4434 8837 4392 8791 4389 8803
4389 8816 4394 8816 4394 8832
TIME...MOT...LOC 1659Z 324DEG 36KT 4425 8839
TORNADO...RADAR INDICATED
MAX HAIL SIZE...3.00 IN
$$
GK6 follow-up statements
881
WWUS53 KGRB 271701
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
1201 PM CDT Mon Jul 27 2026
WIC015-071-087-139-271745-
/O.CON.KGRB.TO.W.0024.000000T0000Z-260727T1745Z/
Calumet WI-Manitowoc WI-Outagamie WI-Winnebago WI-
1201 PM CDT Mon Jul 27 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR CALUMET,
SOUTHWESTERN MANITOWOC, NORTHEASTERN WINNEBAGO AND SOUTH CENTRAL
OUTAGAMIE COUNTIES...
At 1201 PM CDT, a confirmed and extremely dangerous tornado was
located over Appleton, moving southeast at 40 mph.
This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!
HAZARD...Damaging tornado and three inch hail.
SOURCE...Radar confirmed tornado.
IMPACT...You are in a life-threatening situation. Flying debris may
be deadly to those caught without shelter. Mobile homes will
be destroyed. Considerable damage to homes, businesses, and
vehicles is likely and complete destruction is possible.
This tornado will be near...
Appleton, Menasha, Darboy, Kimberly, Kaukauna and Little Chute
around 1205 PM CDT. Northern Lake Winnebago and High Cliff State
Park around 1210 PM CDT. Central Lake Winnebago around 1215 PM CDT.
Chilton around 1225 PM CDT. St Anna and Camp Rokilio Scout Camp
around 1240 PM CDT.
Other locations impacted by the tornado include Uw Fox Valley,
Combined Locks, Neenah, Sherwood, Harrison, Stockbridge, St John,
Kloten, Hilbert and Brant.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A large and extremely dangerous tornado has been confirmed. Move to
an interior room on the lowest floor of a well-built building. If in
a mobile home, vehicle, or outdoors, move to the closest structure
and protect yourself from flying debris.
Move to an interior room on the lowest floor of a well-built building
away from 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 4428 8854 4434 8837 4392 8791 4389 8803
4389 8816 4394 8816 4394 8832
TIME...MOT...LOC 1659Z 324DEG 36KT 4425 8839
TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
MAX HAIL SIZE...3.00 IN
$$
GK192
WWUS53 KGRB 271704
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
1204 PM CDT Mon Jul 27 2026
WIC015-071-087-139-271745-
/O.CON.KGRB.TO.W.0024.000000T0000Z-260727T1745Z/
Calumet WI-Manitowoc WI-Outagamie WI-Winnebago WI-
1204 PM CDT Mon Jul 27 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR CALUMET,
SOUTHWESTERN MANITOWOC, NORTHEASTERN WINNEBAGO AND SOUTH CENTRAL
OUTAGAMIE COUNTIES...
At 1204 PM CDT, a confirmed and extremely dangerous tornado was
located over Menasha, or near Appleton, moving southeast at 40 mph.
This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!
HAZARD...Damaging tornado and three inch hail.
SOURCE...Radar confirmed tornado.
IMPACT...You are in a life-threatening situation. Flying debris may
be deadly to those caught without shelter. Mobile homes will
be destroyed. Considerable damage to homes, businesses, and
vehicles is likely and complete destruction is possible.
This tornado will be near...
Menasha, Appleton, Kimberly, Darboy, Little Chute and Kaukauna
around 1205 PM CDT. Northern Lake Winnebago around 1210 PM CDT.
Central Lake Winnebago and High Cliff State Park around 1215 PM
CDT. Chilton around 1230 PM CDT. St Anna around 1240 PM CDT.
Other locations impacted by the tornado include Uw Fox Valley,
Neenah, Combined Locks, Sherwood, Harrison, St John, Stockbridge,
Hilbert, Kloten and Quinney.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A large and extremely dangerous tornado has been confirmed. Move to
an interior room on the lowest floor of a well-built building. If in
a mobile home, vehicle, or outdoors, move to the closest structure
and protect yourself from flying debris.
Move to an interior room on the lowest floor of a well-built building
away from 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 4428 8854 4434 8837 4392 8791 4389 8803
4389 8816 4394 8816 4394 8832
TIME...MOT...LOC 1701Z 329DEG 34KT 4423 8842
TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
MAX HAIL SIZE...3.00 IN
$$
GK593
WWUS53 KGRB 271712
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
1212 PM CDT Mon Jul 27 2026
WIC071-087-271722-
/O.CAN.KGRB.TO.W.0024.000000T0000Z-260727T1745Z/
Manitowoc WI-Outagamie WI-
1212 PM CDT Mon Jul 27 2026
...TORNADO WARNING IS CANCELLED FOR SOUTHWESTERN MANITOWOC AND SOUTH
CENTRAL OUTAGAMIE COUNTIES...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
portions of east central and northeast Wisconsin.
&&
LAT...LON 4422 8850 4423 8835 4399 8805 4389 8804
4389 8816 4394 8816 4394 8832
TIME...MOT...LOC 1704Z 329DEG 34KT 4421 8840
$$
WIC015-139-271745-
/O.CON.KGRB.TO.W.0024.000000T0000Z-260727T1745Z/
Calumet WI-Winnebago WI-
1212 PM CDT Mon Jul 27 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR CENTRAL
CALUMET AND NORTHEASTERN WINNEBAGO COUNTIES...
At 1212 PM CDT, a confirmed and extremely dangerous tornado was
located over Northern Lake Winnebago, or 8 miles south of Appleton,
moving southeast at 35 mph.
This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!
HAZARD...Damaging tornado and three inch hail.
SOURCE...Radar confirmed tornado.
IMPACT...You are in a life-threatening situation. Flying debris may
be deadly to those caught without shelter. Mobile homes will
be destroyed. Considerable damage to homes, businesses, and
vehicles is likely and complete destruction is possible.
This tornado will be near...
Northern Lake Winnebago, Menasha, High Cliff State Park and
Appleton around 1215 PM CDT. Central Lake Winnebago around 1220 PM
CDT. Chilton around 1235 PM CDT. St Anna around 1240 PM CDT.
Other locations impacted by the tornado include Neenah, Sherwood,
Harrison, Stockbridge, Quinney, Kloten, Brant, Brothertown, Jericho
and Charlesburg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A large and extremely dangerous tornado has been confirmed. Move to
an interior room on the lowest floor of a well-built building. If in
a mobile home, vehicle, or outdoors, move to the closest structure
and protect yourself from flying debris.
Move to an interior room on the lowest floor of a well-built building
away from 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 4422 8850 4423 8835 4399 8805 4389 8804
4389 8816 4394 8816 4394 8832
TIME...MOT...LOC 1704Z 335DEG 31KT 4422 8845
TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
MAX HAIL SIZE...3.00 IN
$$
GK276
WWUS53 KGRB 271721
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
1221 PM CDT Mon Jul 27 2026
WIC015-139-271745-
/O.CON.KGRB.TO.W.0024.000000T0000Z-260727T1745Z/
Calumet WI-Winnebago WI-
1221 PM CDT Mon Jul 27 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR
SOUTHWESTERN CALUMET AND EAST CENTRAL WINNEBAGO COUNTIES...
At 1221 PM CDT, a confirmed and extremely dangerous tornado was
located near Northern Lake Winnebago, or 9 miles northeast of
Oshkosh, moving south at 30 mph.
This is a PARTICULARLY DANGEROUS SITUATION. TAKE COVER NOW!
HAZARD...Damaging tornado and two inch hail.
SOURCE...Radar confirmed tornado.
IMPACT...You are in a life-threatening situation. Flying debris may
be deadly to those caught without shelter. Mobile homes will
be destroyed. Considerable damage to homes, businesses, and
vehicles is likely and complete destruction is possible.
This tornado will be near...
Central Lake Winnebago and Northern Lake Winnebago around 1225 PM
CDT.
Other locations impacted by the tornado include Neenah, Stockbridge,
Kloten, Brothertown, Quinney and Jericho.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A large and extremely dangerous tornado has been confirmed. Move to
an interior room on the lowest floor of a well-built building. If in
a mobile home, vehicle, or outdoors, move to the closest structure
and protect yourself from flying debris.
Move to an interior room on the lowest floor of a well-built building
away from windows. If you are outdoors, in a mobile home, or in a
vehicle, move to the closest substantial shelter and protect yourself
from flying debris.
&&
LAT...LON 4418 8847 4418 8837 4398 8820 4394 8816
4394 8832
TIME...MOT...LOC 1712Z 340DEG 27KT 4418 8846
TORNADO...OBSERVED
TORNADO DAMAGE THREAT...CONSIDERABLE
MAX HAIL SIZE...2.00 IN
$$
GK771
WWUS53 KGRB 271729 RRA
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
1229 PM CDT Mon Jul 27 2026
WIC015-271745-
/O.CON.KGRB.TO.W.0024.000000T0000Z-260727T1745Z/
Calumet WI-
1229 PM CDT Mon Jul 27 2026
...TORNADO WARNING REMAINS IN EFFECT UNTIL 1245 PM CDT FOR
SOUTHWESTERN CALUMET COUNTY...
At 1229 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Central Lake Winnebago, or 6 miles east of Oshkosh,
moving south at 35 mph.
HAZARD...Tornado and quarter size hail.
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 tornado will be near...
Central Lake Winnebago and Northern Lake Winnebago around 1230 PM
CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Move to an interior room on the lowest floor of a well-built building
away from 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 4413 8838 4394 8831 4394 8832 4407 8840
4413 8840
TIME...MOT...LOC 1721Z 357DEG 29KT 4410 8844
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
GK852
WWUS53 KGRB 271740
SVSGRB
Severe Weather Statement
National Weather Service Green Bay WI
1240 PM CDT Mon Jul 27 2026
WIC015-271750-
/O.EXP.KGRB.TO.W.0024.000000T0000Z-260727T1745Z/
Calumet WI-
1240 PM CDT Mon Jul 27 2026
...TORNADO WARNING WILL EXPIRE AT 1245 PM CDT FOR SOUTHWESTERN
CALUMET COUNTY...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire. However, gusty
winds are still possible with this thunderstorm.
&&
LAT...LON 4413 8838 4394 8831 4394 8832 4407 8840
4413 8840
TIME...MOT...LOC 1729Z 357DEG 29KT 4404 8844
$$
WIC139-271750-
/O.EXP.KGRB.TO.W.0024.000000T0000Z-260727T1745Z/
Winnebago WI-
1240 PM CDT Mon Jul 27 2026
...TORNADO WARNING WILL EXPIRE AT 1245 PM CDT FOR SOUTHWESTERN
CALUMET COUNTY...
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire. However, gusty
winds are still possible with this thunderstorm.
&&
LAT...LON 4413 8838 4394 8831 4394 8832 4407 8840
4413 8840
TIME...MOT...LOC 1721Z 357DEG 29KT 4410 8844
$$
GKWhat forecasters said that day
The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Green Bay, WI wrote its last area forecast discussion before this tornado warning went out at Jul 27, 5:58 AM CDT, 6 hours 1 minute earlier. Its key messages:
- Severe thunderstorms capable of producing damaging winds and isolated large hail are possible this morning, and again across northeast Wisconsin this afternoon. A Severe Thunderstorm Watch is in effect until 9 AM.
- Heat indices are forecast into the middle to upper 90s across central Wisconsin this afternoon.
- Gusty northerly winds will build waves from 3 to 5 feet on Lake Michigan south of Two Rivers this evening into Tuesday afternoon.
- A cold front passing through the region will bring a shift to northerly winds and relief from the high humidity for Tuesday through mid-week, with lower thunderstorm chances until late in the work week.
Area forecast discussion, Jul 27, 5:58 AM CDT, 6 hours 1 minute before
Area Forecast Discussion National Weather Service Green Bay WI 558 AM CDT Mon Jul 27 2026 Updated aviation portion for 12Z TAF issuance .KEY MESSAGES... - Severe thunderstorms capable of producing damaging winds and isolated large hail are possible this morning, and again across northeast Wisconsin this afternoon. A Severe Thunderstorm Watch is in effect until 9 AM. - Heat indices are forecast into the middle to upper 90s across central Wisconsin this afternoon. - Gusty northerly winds will build waves from 3 to 5 feet on Lake Michigan south of Two Rivers this evening into Tuesday afternoon. - A cold front passing through the region will bring a shift to northerly winds and relief from the high humidity for Tuesday through mid-week, with lower thunderstorm chances until late in the work week. && .DISCUSSION... Issued at 245 AM CDT Mon Jul 27 2026 The latest RAP analysis and satellite/radar imagery show a surface low pressure centered over northwest Minnesota. A cold front extends southwest across eastern South Dakota, while a warm front extends southeast and across far northern Wisconsin. Elevated convection continues across parts of northern Minnesota and northern Wisconsin early this morning, situated on the cool side of the warm front. The environment remains conditionally favorable for severe weather across the region, with MUCAPE in 2000-3000 J/kg range and strong deep-layer shear of 40 to 50 knots. While storms have struggled to intensify over northern Wisconsin so far, a Severe Thunderstorm Watch has been issued until 9 AM. Low-level warm advection ahead of the southeast sliding surface low is expected to generate additional storm development early this morning. Most guidance continues to depict an increase in storm coverage and eventual clustering or organization into one or more squall lines, capable of producing damaging winds and isolated large hail. While a very low probability, a weak spin up along a more organized line segment is possible given favorable 0-3km wind shear. Confidence remains low with the evolution, as the CAMS have a relatively poor track record over the past 24-36 hours. These storms will likely exit northeast Wisconsin by mid to late morning. A lull in thunderstorm potential is expected late this morning through early afternoon following the departure of the morning convective cluster. Rapid destabilization is then forecast during the afternoon under strong heating. Upwards of 2000 to 3000 J/kg of CAPE could build near peak heating, primarily over east-central Wisconsin. Deep-layer shear of 50 knots will support rapid storm intensification if storms redevelop. The most probable window for severe storms is from 2 PM to 6 PM. Very warm and humid conditions will again push heat index values into the middle to upper 90s across Wood, Portage, Waupaca, and Waushara counties this afternoon. Heat indices in these areas may briefly flirt with 100 degrees but duration will be short (1-2 hours). Therefore no Heat Advisory will be issued. Behind the departing surface low, north winds will intensify tonight with gusts of 20 to 25 mph. Skies will clear from north to south, leading to a mostly sunny Tuesday. While temperatures will remain near to slightly above normal on Tuesday, a much drier airmass will bring welcome relief as humidity levels fall into the lower 40s in the afternoon. Long Term...Wednesday Through Sunday High pressure will stick around into Wednesday, keeping conditions dry and quiet across north-central and northeast Wisconsin. Numerical models have trended slightly quicker with warm advection returning late Wednesday, resulting in more ambitious shower development for the second half of Wednesday through Thursday. The next chance for widespread rain and thunderstorm activity will arrive on Thursday night and linger at times into Saturday. Upper- level winds are forecast to remain relatively light, which should keep the severe weather risk low. Temperatures will remain at or slightly above normal next weekend with high pressure building back into the western Great Lakes. && .AVIATION...for 12Z TAF Issuance Issued at 558 AM CDT Mon Jul 27 2026 A warm front and surface low over northern Minnesota will bring potential for thunderstorms today. Clusters of showers and thunderstorms extending from the Arrowhead of Minnesota into northeast Wisconsin continue to move southeast along the warm front. The primary threat through 17Z will be across far northeast Wisconsin, particularly along the Upper Peninsula border. If storms continue to organize, potential will increase for hail and strong wind gusts north of a RHI to SUE line. Other storms over northeast WI should exit by shortly after TAF issuance. MVFR ceilings expanding along the front over northwest Wisconsin could drift into KRHI and AUW for a few hours this morning. Otherwise, predominant VFR conditions are expected across central and northeast Wisconsin terminals. A general lull of the thunderstorm activity is expected from late morning through early afternoon before additional isolated to scattered storms redevelop between 19Z and 23Z along and ahead of the surface low. The highest probability for afternoon convection will focus over east- central Wisconsin, potentially impacting KGRB, KATW, and KMTW. Confidence on timing and spatial coverage of showers and storms remains low, so PROB30 groups were added. Behind the low, winds shift north to northeast with gusts to 20 kts. A period of MVFR ceilings is possible at all terminals this evening before clearing to VFR after 08Z. Outlook: High pressure brings widespread VFR conditions and lighter winds Tuesday into Wednesday. .KOSH... Scattered to broken clouds with ceilings 3.5 to 4.5 kft could impact OSH this morning, which eventually evolve into a cumulus field with daytime heating. Low confidence that any storms will impact OSH this morning. As the surface low moves across northern WI this afternoon, concern increases for thunderstorms development. Forecast soundings show ample dry air that should keep coverage isolated. Added a prob30 group for the most favored time frame for showers, but held off adding thunder. Confidence is low due to the dry air. Behind the low, winds will shift to the north or northeast and become gusty for a time. Gusts to 15-20 kts seem reasonable. The north winds could also bring a brief period of MVFR ceilings before skies clear overnight. && .MARINE... Issued at 245 AM CDT Mon Jul 27 2026 A cold front sagging south across the region will bring a risk of severe thunderstorms to Green Bay and Lake Michigan this morning and again this afternoon, posing a hazard to mariners. Behind the front, a tightening pressure gradient will cause northerly winds to increase to 15 to 25 knots tonight into Tuesday. Waves will build to 3 to 5 feet on the Lake Michigan nearshore waters south of Two Rivers, and a Small Craft Advisory will be issued. Winds and waves will gradually subside Tuesday afternoon as high pressure builds in from the north. && .GRB WATCHES/WARNINGS/ADVISORIES... None. && DISCUSSION.....MPC AVIATION.......MPC MARINE.........MPC
Hazardous weather outlook, Jul 27, 2:49 AM CDT, 9 hours 10 minutes before
Hazardous Weather Outlook National Weather Service Green Bay WI 249 AM CDT Mon Jul 27 2026 WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-280800- Vilas-Oneida-Forest-Florence-Northern Marinette County-Lincoln- Langlade-Menominee-Northern Oconto County-Door-Marathon-Shawano- Wood-Portage-Waupaca-Outagamie-Brown-Kewaunee-Waushara-Winnebago- Calumet-Manitowoc-Southern Marinette County- Southern Oconto County- 249 AM CDT Mon Jul 27 2026 This Hazardous Weather Outlook is for north-central and northeast Wisconsin. .DAY ONE...Today and Tonight Strong to severe thunderstorms and locally heavy rainfall are possible at times through this afternoon. Damaging winds, large hail, and urban and small stream flooding will be the primary hazards. Heat index values may reach the middle to upper 90s over parts of central Wisconsin this afternoon. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday The chance of thunderstorms will return late in the work week. .SPOTTER INFORMATION STATEMENT... Spotters are requested to report any wind damage or hail to the National Weather Service in Green Bay. LMZ521-522-541>543-280800- The Bay of Green Bay south of a line from Cedar River MI to Rock Island Passage-Lake Michigan from Washington Island to Sheboygan- 249 AM CDT Mon Jul 27 2026 This Hazardous Weather Outlook is for portions of northwest Lake Michigan and the waters of Green Bay. .DAY ONE...Today and Tonight Strong to severe thunderstorms are possible at times through this afternoon. Any storms could pose a hazard to mariners. .DAYS TWO THROUGH SEVEN...Tuesday through Sunday Conditions hazardous to small craft are expected south of Two Rivers tonight through Tuesday afternoon. The chance of thunderstorms will return late in the work week. MPC
In the hours before
Local storm report, Jul 27, 10:50 AM CDT, 1 hour 9 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
1050 AM CDT Mon Jul 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0850 AM Tstm Wnd Dmg 1 NNW Conover 46.06N 89.26W
07/27/2026 Vilas WI Public
Trees and power lines down.
0845 AM Tstm Wnd Dmg 1 NW Star Lake 46.04N 89.47W
07/27/2026 Vilas WI Public
Trees and power lines down.
&&Local storm report, Jul 27, 10:51 AM CDT, 1 hour 8 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
1051 AM CDT Mon Jul 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1025 AM Hail 1 ESE Lyndhurst 44.82N 88.78W
07/27/2026 M2.75 Inch Shawano WI Public
Report forwarded via Amateur Radio.
&&Local storm report, Jul 27, 10:58 AM CDT, 1 hour 1 minute before
Preliminary Local Storm Report
National Weather Service Green Bay WI
1058 AM CDT Mon Jul 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0915 AM Hail 3 SSE Three Lakes 45.75N 89.14W
07/27/2026 M1.50 Inch Oneida WI Public
Report and photo forwarded via broadcast
media.
&&Local storm report, Jul 27, 11:12 AM CDT, 47 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
1112 AM CDT Mon Jul 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1111 AM Hail Algoma 44.61N 87.44W
07/27/2026 M3.00 Inch Kewaunee WI Public
&&Local storm report, Jul 27, 11:13 AM CDT, 46 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
1113 AM CDT Mon Jul 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1002 AM Hail 1 NW Algoma 44.62N 87.45W
07/27/2026 M2.00 Inch Kewaunee WI Public
Report via Kewaunee County EM.
&&Local storm report, Jul 27, 11:27 AM CDT, 32 minutes before
Preliminary Local Storm Report
National Weather Service Green Bay WI
1127 AM CDT Mon Jul 27 2026
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
1050 AM Hail 2 NNE Belle Plaine 44.74N 88.65W
07/27/2026 M3.00 Inch Shawano WI Public
Photo received on social media.
&&
HEKThe office that day
Everything else NWS Green Bay, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 26, 11:15 PM CDT | Special Weather Statement | GRB | Marathon | 30 min |
| Jul 26, 11:39 PM CDT | Special Weather Statement | GRB | Shawano, Waupaca | 36 min |
| Jul 27, 12:08 AM CDT | Special Weather Statement | GRB | Waupaca | 37 min |
| Jul 27, 12:47 AM CDT | Special Weather Statement | GRB | Winnebago | 58 min |
| Jul 27, 2:53 AM CDT | Small Craft Advisory | GRB | 36 hr | |
| Jul 27, 3:48 AM CDT | Special Weather Statement | GRB | Brown | 27 min |
| Jul 27, 4:27 AM CDT | Special Weather Statement | GRB | Brown | 33 min |
| Jul 27, 8:20 AM CDT | Severe Thunderstorm Warning | GRB | Forest, Oneida, Vilas | 55 min |
| Jul 27, 9:05 AM CDT | Heat Advisory | GRB | Portage, Waupaca, Waushara, Winnebago, Wood | 10 hr |
| Jul 27, 9:06 AM CDT | Severe Thunderstorm Warning | GRB | Florence, Forest, Marinette, Oneida | 54 min |
| Jul 27, 9:13 AM CDT | Special Weather Statement | GRB | Oneida, Vilas | 47 min |
| Jul 27, 9:14 AM CDT | Special Marine Warning | GRB | 31 min | |
| Jul 27, 9:15 AM CDT | Special Weather Statement | GRB | Kewaunee | 45 min |
| Jul 27, 9:21 AM CDT | Severe Thunderstorm Warning | GRB | Door | 39 min |
| Jul 27, 9:31 AM CDT | Severe Thunderstorm Warning | GRB | Langlade, Oconto | 44 min |
| Jul 27, 9:34 AM CDT | Special Marine Warning | GRB | 56 min | |
| Jul 27, 9:39 AM CDT | Severe Thunderstorm Warning | GRB | Door, Kewaunee | 38 min |
| Jul 27, 9:44 AM CDT | Tornado Warning | GRB | Forest, Langlade, Oconto | 31 min |
| Jul 27, 9:51 AM CDT | Special Marine Warning | GRB | 54 min | |
| Jul 27, 9:57 AM CDT | Severe Thunderstorm Warning | GRB | Forest, Langlade, Marinette, Menominee, Oconto, Shawano | 63 min |
| Jul 27, 10:23 AM CDT | Severe Thunderstorm Warning | GRB | Marinette | 37 min |
| Jul 27, 10:31 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Menominee, Outagamie, Shawano, Waupaca | 44 min |
| Jul 27, 10:42 AM CDT | Special Marine Warning | GRB | 63 min | |
| Jul 27, 10:45 AM CDT | Special Marine Warning | GRB | 83 min | |
| Jul 27, 10:45 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Outagamie, Shawano, Waupaca | 45 min |
| Jul 27, 10:58 AM CDT | Severe Thunderstorm Warning | GRB | Marinette, Oconto | 17 min |
| Jul 27, 11:13 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Calumet, Outagamie, Winnebago | 47 min |
| Jul 27, 11:21 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Door, Kewaunee | 39 min |
| Jul 27, 11:29 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Outagamie | 31 min |
| Jul 27, 11:38 AM CDT | Areal Flood Advisory | GRB | Brown, Calumet, Outagamie | 2 hr |
| Jul 27, 11:39 AM CDT | Special Marine Warning | GRB | 96 min | |
| Jul 27, 11:58 AM CDT | Severe Thunderstorm Warning | GRB | Brown, Calumet, Manitowoc, Outagamie, Winnebago | 62 min |
| Jul 27, 12:17 PM CDT | Tornado Warning | GRB | Calumet, Winnebago | 24 min |
| Jul 27, 12:43 PM CDT | Severe Thunderstorm Warning | GRB | Winnebago | 32 min |
| Jul 27, 1:08 PM CDT | Areal Flood Advisory | GRB | Calumet, Winnebago | 76 min |
Nearby
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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.