Severe Thunderstorm Warning 33, NWS Grand Rapids, MI

Area Forecast Discussion
National Weather Service Grand Rapids MI
253 PM EDT Mon Jun 9 2025

.KEY MESSAGES...

- Round of Thunderstorms this Afternoon and Evening

- Additional Thunderstorm Chances Late Week

&&

.DISCUSSION...
Issued at 253 PM EDT Mon Jun 9 2025

- Round of Thunderstorms this Afternoon and Evening

As daytime instability has increase to around 500-1000 J/kg this
afternoon we are already seeing showers and storms develop ahead
of the main line currently moving across Lake Michigan. We will
also see a core of slightly stronger 850mb winds 30-35 knots move
in with the line. Sounding profiles have an inverted V look to
them signifying higher cloud bases and drier air at the surface.
With the synoptic lift moving in with the upper level low, modest
shear, instability, and dry air at the surface some strong to
severe storms are possible with winds being the primary threat and
hail as the secondary.

Once the line of storms over Lake Michigan moves through, dry
conditions are largely expected overnight. Some showers may linger
toward US-10 overnight.

- Additional Thunderstorm Chances Late Week

We remain in the northwest flow with a couple weak shortwave
troughs moving through Tuesday/Tuesday night and then again
Wednesday night into Thursday. The low level jet noses in Tuesday
night, but moisture is lacking. Better moisture is present
Wednesday night into Thursday with showers and storms expected to
continue off an on through the remainder of the week as a boundary
stalls over the area. This matches up with the NBM PoPs of 30 to
50 percent.

Temperatures during this time will be in the 70s to low 80s with
lows in the 50s. Friday looks to be the coolest day of the week
with areas north of I-96 potentially remaining in the 60s.

&&

.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 1245 PM EDT Mon Jun 9 2025

The main focus of this set of forecasts will be on the convection
expected to develop this afternoon and move through by mid
evening. Mid clouds have moved over most of the terminals early
this afternoon, all VFR in nature so far. We are expecting showers
and storms to begin developing toward 19z along the lakeshore, and
then becoming more widespread and moving east through about 01-02z
this evening. Conditions under the convection are likely to drop
to IFR. Further inland will have a better chance of more wind gust
potential as the storms organize away from Lake Michigan.

Once the storms move east of the area, we should see some clearing
take place, but scattered clouds will remain through the night.
These should be VFR. Fog potential is not zero with the rainfall
expected, but a persistent wind staying up through the night
should mitigate the potential enough to keep out of the forecast
for now.

We will see more extensive cloud cover develop by 14-15z Tuesday
as widespread cumulus/stratocumulus develops. A sprinkle or light
shower is not out of the question.

&&

.MARINE...
Issued at 253 PM EDT Mon Jun 9 2025

Scattered thunderstorms this afternoon could bring gusty winds and
hail. Once storms pass dry conditions are expected until
Wednesday night. Winds may approach small craft advisory right
along the shoreline this afternoon, but the colder water
temperatures should keep most of these gusts at bay.

Winds look to remain below Small Craft Advisory levels and in turn
wave heights are expected to be around 3 feet or less through the
remainder of the week.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...None.
MARINE...None.

&&

DISCUSSION...RAH
AVIATION...NJJ
MARINE...RAH

Hazardous Weather Outlook
National Weather Service Grand Rapids MI
259 PM EDT Mon Jun 9 2025

MIZ037>040-043>046-050>052-056>059-064>067-071>074-101900-
Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon-
Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton-
Ingham-Van Buren-Kalamazoo-Calhoun-Jackson-
259 PM EDT Mon Jun 9 2025

This hazardous weather outlook is for portions of southwest Lower
Michigan.

.DAY ONE...This Afternoon and Tonight

Scattered thunderstorms continue this afternoon and evening. Some
strong to severe storms are possible with damaging winds and hail.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Thunderstorms will be possible at times Wednesday night through
the end of the week.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

LMZ844>849-101900-
St Joseph to South Haven MI-South Haven to Holland MI-
Holland to Grand Haven MI-Grand Haven to Whitehall MI-
Whitehall to Pentwater MI-Pentwater to Manistee MI-
259 PM EDT Mon Jun 9 2025

This hazardous weather outlook is for the nearshore waters from
St Joseph to Manistee.

.DAY ONE...This Afternoon and Tonight

Thunderstorms are expected this afternoon with the potential for
damaging winds.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Additional rounds of thunderstorms are possible Wednesday night
through the end of the week.

.SPOTTER INFORMATION STATEMENT...

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Special Weather Statement
National Weather Service Grand Rapids MI
358 PM EDT Mon Jun 9 2025

MIZ050-092045-
Muskegon MI-
358 PM EDT Mon Jun 9 2025

...A strong thunderstorm will impact portions of Muskegon County
through 445 PM EDT
...

At 358 PM EDT, Doppler radar was tracking a strong thunderstorm near
Roosevelt Park, or 6 miles southwest of Muskegon, moving northeast at
40 mph.

HAZARD...Winds in excess of 40 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Muskegon...            Muskegon Heights...    Roosevelt Park...
North Muskegon...      Ravenna...             Fruitport...
Norton Shores...       Dalton...              Holton...
Sullivan...            Casnovia...            Muskegon SP...
Moorland...            Wolf Lake...           Twin Lake...
Slocum...              Cloverville...         Bailey...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
southwestern and west central Michigan.

&&

LAT...LON 4342 8606 4341 8604 4330 8604 4329 8582
      4328 8580 4320 8579 4321 8591 4312 8591
      4312 8627 4322 8634 4323 8634 4324 8635
      4324 8634 4331 8639
TIME...MOT...LOC 1958Z 241DEG 36KT 4315 8633

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...40 MPH

THOMAS

Special Weather Statement
National Weather Service Grand Rapids MI
415 PM EDT Mon Jun 9 2025

MIZ071-072-092100-
Kalamazoo MI-Van Buren MI-
415 PM EDT Mon Jun 9 2025

...Strong thunderstorms will impact portions of Van Buren and western
Kalamazoo Counties through 500 PM EDT
...

At 414 PM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from 6 miles east of Hartford to 8 miles west of
Decatur to near Dowagiac. Movement was northeast at 45 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Kalamazoo...           Portage...             Paw Paw...
Hartford...            Mattawan...            Lawton...
Decatur...             Schoolcraft...         Westwood...
Alamo...               Keeler...              Lawrence...
Oshtemo...             Glendale...            Kendall...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
southwestern Michigan.

&&

LAT...LON 4207 8622 4209 8623 4225 8618 4242 8564
      4207 8562
TIME...MOT...LOC 2014Z 240DEG 38KT 4219 8605 4207 8613 4198 8618

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

THOMAS

Special Weather Statement
National Weather Service Grand Rapids MI
417 PM EDT Mon Jun 9 2025

MIZ056-057-092100-
Ottawa MI-Kent MI-
417 PM EDT Mon Jun 9 2025

...A strong thunderstorm will impact portions of southwestern Kent
and Ottawa Counties through 500 PM EDT
...

At 417 PM EDT, Doppler radar was tracking a strong thunderstorm 8
miles north of Holland SP, or 10 miles south of Grand Haven, moving
northeast at 50 mph.

HAZARD...Wind gusts of 50 to 55 mph and pea size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Grand Rapids...        Holland...             Wyoming...
Kentwood...            Walker...              Grandville...
East Grand Rapids...   Hudsonville...         Zeeland...
Coopersville...        Sparta...              Jenison...
Allendale...           Beechwood...           Conklin...
Wright...              Port Sheldon...        Borculo...
Lamont...              Olive Center...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

A Severe Thunderstorm Watch remains in effect until 1000 PM EDT for
southwestern and west central Michigan.

&&

LAT...LON 4301 8623 4312 8595 4312 8591 4314 8591
      4321 8573 4291 8555 4279 8612 4280 8612
      4280 8613 4278 8616 4279 8618 4278 8620
TIME...MOT...LOC 2017Z 244DEG 45KT 4290 8624

MAX HAIL SIZE...0.25 IN
MAX WIND GUST...55 MPH

THOMAS

Preliminary Local Storm Report
National Weather Service Grand Rapids MI
436 PM EDT Mon Jun 9 2025

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0435 PM     Hail             4 ENE Climax            42.25N 85.26W
06/09/2025  E0.25 Inch       Calhoun            MI   Trained Spotter

&&

NJJ