WWA Summary for All Issued by GRR

Air Quality Alert

MIZ078-177-277-180400-
Cass MI-Northern Berrien-Southern Berrien-
Including the cities of Dowagiac, Cassopolis, Edwardsburg,
Marcellus, Benton Harbor, St. Joseph, Paw Paw Lake, Niles,
New Buffalo, Stevensville, and Berrien Springs
1233 PM EDT Mon Jun 16 2025

...AIR QUALITY ADVISORY FOR TUESDAY JUNE 17, 2025...

The Michigan Department of Environment, Great Lakes, and Energy
(EGLE) has declared an Air Quality Advisory for June 17, for
elevated levels of ozone in several western lake shore counties.
Pollutants within those areas are expected to be in the Unhealthy for
Sensitive Groups (USG, Orange AQI) range.

The Air Quality Advisory is in effect for the following counties in
southwest Michigan...

Berrien and Cass

Although smoke advisories are no longer an issue for the meantime,
we are getting into the peak season for ozone development. This will
be the case for Tuesday, as all signs point towards the likely
development of elevated ozone along several lake shore counties.
Elements such as wind direction, temperature, dewpoint and upper air
conditions all point towards the likelihood that could see ozone
concentration in the USG range. Cloud cover is uncertain during the
peak heating hours, but enough sun will likely trigger the
photochemical reactions necessary to generate ozone.

It is recommended that, when possible, you avoid strenuous outdoor
activities, especially those with respiratory diseases such as
asthma.

People and businesses are urged to avoid activities which lead to
ozone formation. These activities include:
 * refueling vehicles or topping off when refueling;
 * using gasoline powered lawn equipment;
 * using charcoal lighter fluid.

Positive activities include:
 * driving less;
 * telecommuting;
 * walking or bike riding;
 * delaying or combining errands;
 * using water-based paints.

For up-to-date air quality data for Michigan visit the MiAir site:
https://air-egle.hub.arcgis.com/

For up-to-date air quality data nationally visit EPA`s Air Now site:
https://www.airnow.gov/

$$

MIZ050-056-057-064-071-180400-
Muskegon-Ottawa-Kent-Allegan-Van Buren-
Including the cities of Muskegon, Grand Haven, Jenison,
Grand Rapids, Holland, and South Haven
1224 PM EDT Mon Jun 16 2025

Air Quality Advisory for June 17, 2025

The Michigan Department of Environment, Great Lakes, and
Energy (EGLE) has declared an Air Quality Advisory for
June 17 for elevated levels of ozone in several western lake
shore counties.

Pollutants within those areas are expected to be in the Unhealthy
for Sensitive Groups (USG, Orange AQI) range.

The Air Quality Advisory is in effect for the following Michigan
counties: Allegan, Kent, Muskegon, Ottawa, and Van Buren

All signs point towards the likely development of elevated ozone
along the several lake shore counties. Elements such as wind
direction, temperature, dew points, upper air conditions all point
towards the likelihood that could see ozone concentration in the
Unhealthy for Sensitive Groups (USG) range along those counties.
Cloud cover is uncertain during the peak heating hours of the day,
but enough sun will likely be present to trigger the photochemical
reactions necessary to generate ozone.

It is recommended that, when possible, you avoid strenuous outdoor
activities, especially those with respiratory diseases such as
asthma.

People and businesses are urged to avoid activities which can lead to
ozone formation.

These activities include: refueling vehicles or
topping off when refueling, using gasoline powered lawn equipment,
using charcoal lighter fluid.

Positive activities include: Driving less, telecommuting, walking or
bike riding, delaying or combining errands, using water-based
paints.

For further information, please see EPAs Air Now site for up-to-
date air quality data:

https://www.airnow.gov/

$$

Thomas

Hazardous Weather Outlook

Hazardous Weather Outlook
National Weather Service Milwaukee/Sullivan WI
229 PM CDT Mon Jun 16 2025

LMZ080-261-362-364-366-563-565-567-669-671-673-675-777-779-868-
870-872-874-876-878-171930-
Lake Michigan Michigan City IN to St. Joseph MI 5 NM offshore to
mid-line of lake.-
Lake Michigan from Seul Choix Point to Rock Island Passage 5NM
offshore to Mid Lake-
Lake Michigan South of a line from Seul Choix Point to the
Mackinac Bridge and North of a line from Charlevoix MI to South
Fox Island 5NM offshore-
Lake Michigan from Charlevoix to Point Betsie MI 5NM Offshore to
mid lake-
Lake Michigan from Point Betsie to Manistee MI 5NM offshore to
Mid Lake-
Lake Michigan from Rock Island Passage to Sturgeon Bay WI 5NM
offshore to mid lake-
Lake Michigan from Sturgeon Bay to Two Rivers WI 5NM offshore to
Mid Lake-
Lake Michigan from Two Rivers to Sheboygan WI 5NM offshore to Mid
Lake-
Lake Michigan from Sheboygan to Port Washington WI 5NM offshore
to Mid Lake-
Lake Michigan from Port Washington to North Point Light WI 5NM
offshore to Mid Lake-
Lake Michigan from North Point Light to Wind Point WI 5NM
offshore to Mid Lake-
Lake Michigan from Wind Point WI to Winthrop Harbor IL 5NM
offshore to Mid Lake-
Lake Michigan from Winthrop Harbor to Wilmette Harbor IL 5NM
offshore to Mid Lake-
Lake Michigan from Wilmette Harbor to Michigan City in 5NM
offshore to Mid Lake-
Lake Michigan from Pentwater to Manistee MI 5NM offshore to Mid
Lake-
Lake Michigan from Whitehall to Pentwater MI 5NM offshore to Mid
Lake-
Lake Michigan from Grand Haven to Whitehall MI 5NM offshore to
Mid Lake-
Lake Michigan from Holland to Grand Haven MI 5NM offshore to Mid
Lake-
Lake Michigan from South Haven to Holland MI 5NM offshore to Mid
lake-
Lake Michigan from St Joseph to South Haven MI 5NM offshore to
Mid Lake-
229 PM CDT Mon Jun 16 2025

This Hazardous Weather Outlook is for the open waters of Lake
Michigan.

.DAY ONE...Tonight

There are chances for thunderstorms mainly later tonight.

.DAYS TWO THROUGH SEVEN...Tuesday through Monday

There are chances for thunderstorms Tuesday into Tuesday night, as
a cold front moves southeast into the region. There are chances
for thunderstorms Wednesday into Wednesday night, as low pressure
moves through the region. Some strong to perhaps severe storms are
possible, with the better chances Wednesday into Wednesday night.
There is uncertainty with if and how much thunderstorm activity
may occur during these periods.

There are chances for thunderstorms at times Thursday afternoon
into Saturday morning.

$$
Wood
www.weather.gov/mkx

Hazardous Weather Outlook...UPDATED
National Weather Service Northern Indiana
224 PM EDT Mon Jun 16 2025

INZ005>009-012>015-017-018-020-022>027-032>034-103-104-116-203-204-
216-LMZ043-046-MIZ078>081-177-277-OHZ001-002-004-005-015-016-024-025-
171830-
Elkhart-Lagrange-Steuben-Noble-De Kalb-Starke-Pulaski-Marshall-
Fulton IN-Whitley-Allen IN-White-Cass IN-Miami-Wabash-Huntington-
Wells-Adams-Grant-Blackford-Jay-Northern La Porte-
Eastern St. Joseph IN-Northern Kosciusko-Southern La Porte-
Western St. Joseph IN-Southern Kosciusko-
New Buffalo MI to St Joseph MI-Michigan City IN to New Buffalo MI-
Cass MI-St. Joseph MI-Branch-Hillsdale-Northern Berrien-
Southern Berrien-Williams-Fulton OH-Defiance-Henry-Paulding-Putnam-
Van Wert-Allen OH-
224 PM EDT Mon Jun 16 2025 /124 PM CDT Mon Jun 16 2025/

This Hazardous Weather Outlook is for northern Indiana, southwest
Michigan, northwest Ohio and the nearshore waters of southeastern
Lake Michigan.

.DAY ONE...This afternoon and tonight.

There is a chance for isolated thunderstorms this afternoon into
this evening along and south of US 24. Severe weather is not
expected.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday.

Multiple rounds of thunderstorms possible Tuesday night through
Wednesday night. Severe storms and heavy rainfall are possible
Wednesday afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected at this time.

$$