Alert archive / Wisconsin / Heat Advisories in 2026

Heat Advisory 2, NWS Green Bay, WI

July 1, 202613 counties in Wisconsin

NWS Green Bay, WI issued this heat advisory at Jul 1, 2026, 12:35 AM CDT for 13 counties in Wisconsin. It took effect at Jul 1, 2026, 11:00 AM CDT. It was in force for 8 hr.

The area

The counties it named.

The facts

Issued
Jul 1, 2026, 12:35 AM CDT (05:35 UTC)
In effect from
Jul 1, 2026, 11:00 AM CDT
Expired
Jul 1, 2026, 7:16 PM CDT
In force
8 hr
Issued by
NWS Green Bay, WI

Counties Brown County, WI, Calumet County, WI, Door County, WI, Kewaunee County, WI, Manitowoc County, WI, Marinette County, WI, Menominee County, WI, Oconto County, WI, Outagamie County, WI, Shawano County, WI, Waupaca County, WI, Waushara County, WI, Winnebago County, WI

The radar

The Green Bay radar (KGRB), 16 km from the middle of the area, began a volume at 05:37 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 forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Jun 30, 10:52 PM CDT, 1 hour 43 minutes earlier.

Area forecast discussion, Jun 30, 10:52 PM CDT, 1 hour 43 minutes before
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Hazardous weather outlook, Jun 30, 2:44 PM CDT, 9 hours 51 minutes before
Hazardous Weather Outlook
National Weather Service Green Bay WI
244 PM CDT Tue Jun 30 2026

WIZ005-010>013-018>022-030-031-035>040-045-048>050-073-074-011945-
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-
244 PM CDT Tue Jun 30 2026

This Hazardous Weather Outlook is for north-central and northeast
Wisconsin.

.DAY ONE...Tonight

Extreme heat warnings and heat advisories will expire at 7 PM this
evening.

Isolated strong to severe thunderstorms are expected into this
evening. The main hazards are large hail, damaging winds, and
heavy rainfall.

There is an increased risk of rip currents at Lake Michigan
beaches.

.DAYS TWO THROUGH SEVEN...Wednesday through Tuesday

Daytime heat index values will be near 100 degrees on Wednesday,
especially over east-central WI. A Heat Advisory may be needed.

Thunderstorms are expected Wednesday morning, then again Wednesday
afternoon into Wednesday evening. The storms on Wednesday morning
could produce strong wind gusts. The storms Wednesday afternoon
into Wednesday evening may result in a higher-end severe risk,
with the potential for damaging winds over 70 mph, hail up to
golf-ball sized hail, and an isolated tornado. Heavy rain is
expected Wednesday and Wednesday night, which could produce at
least isolated instances of flash flooding.

Periodic chances for thunderstorms will continue through late this
week. A few storms on Thursday could be strong to severe. Heavy
rain could also occur.

.SPOTTER INFORMATION STATEMENT...

Spotters are requested to report peak wind gusts, hail, and any
flooding to the National Weather Service in Green Bay. Spotter
activation may be needed on Wednesday.

LMZ521-522-541>543-011945-
The Bay of Green Bay south of a line from Cedar River MI to Rock
Island Passage-Lake Michigan from Washington Island to Sheboygan-
244 PM CDT Tue Jun 30 2026

This Hazardous Weather Outlook is for portions of northwest Lake
Michigan and the waters of Green Bay.

.DAY ONE...Tonight

Conditions hazardous to small craft are expected on Lake Michigan
due to persistent southerly winds and building waves.

There is a chance for thunderstorms this evening into tonight.
Any thunderstorm would pose a hazard to mariners.

.DAYS TWO THROUGH SEVEN...Wednesday through Tuesday

Periodic chances for thunderstorms will last through the upcoming
weekend. The greatest risk for severe storms will be Wednesday
afternoon into Wednesday evening. Storms occurring Thursday could
be strong to severe. Any thunderstorm would pose a hazard to
mariners.

JLA

In the hours before

Special weather statement, Jun 30, 7:03 PM CDT, 5 hours 32 minutes before
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Local storm report, Jun 30, 7:06 PM CDT, 5 hours 29 minutes before
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Local storm report, Jun 30, 7:31 PM CDT, 5 hours 4 minutes before
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Local storm report, Jun 30, 7:39 PM CDT, 4 hours 56 minutes before
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Local storm report, Jun 30, 7:43 PM CDT, 4 hours 52 minutes before
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Local storm report, Jun 30, 8:11 PM CDT, 4 hours 24 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 30, 7:03 PM CDTSpecial Weather StatementGRBKewaunee27 min
Jun 30, 7:05 PM CDTAreal Flood AdvisoryGRBBrown, Kewaunee107 min
Jun 30, 7:28 PM CDTSpecial Marine WarningGRB62 min
Jul 1, 6:05 AM CDTSevere Thunderstorm WarningGRBWaushara55 min
Jul 1, 6:43 AM CDTSevere Thunderstorm WarningGRBWaupaca, Waushara, Winnebago47 min
Jul 1, 7:15 AM CDTSevere Thunderstorm WarningGRBCalumet, Outagamie, Winnebago45 min
Jul 1, 7:25 AM CDTSevere Thunderstorm WarningGRBCalumet, Winnebago50 min
Jul 1, 7:56 AM CDTSevere Thunderstorm WarningGRBBrown, Calumet, Kewaunee, Manitowoc, Outagamie64 min
Jul 1, 8:04 AM CDTSpecial Marine WarningGRB56 min
Jul 1, 8:27 AM CDTSpecial Marine WarningGRB93 min
Jul 1, 8:33 AM CDTSevere Thunderstorm WarningGRBDoor, Kewaunee57 min
Jul 1, 8:36 AM CDTSpecial Marine WarningGRB84 min
Jul 1, 8:56 AM CDTSpecial Marine WarningGRB64 min
Jul 1, 9:03 AM CDTSpecial Weather StatementGRBManitowoc57 min
Jul 1, 9:06 AM CDTSpecial Marine WarningGRB84 min
Jul 1, 9:11 AM CDTSpecial Marine WarningGRB64 min
Jul 1, 9:21 AM CDTSevere Thunderstorm WarningGRBDoor29 min
Jul 1, 10:09 AM CDTSpecial Marine WarningGRB36 min
Jul 1, 11:23 AM CDTFlood WatchGRBBrown, Calumet, Kewaunee, Manitowoc, Marathon, Menominee and 8 more19 hr
Jul 1, 12:33 PM CDTSpecial Weather StatementGRBMarinette42 min

Nearby

Heat Advisories in Wisconsin, 2026Every heat advisory in 2026

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; radar from the NEXRAD Level II archive.