Alert archive / Michigan / Special Marine Warnings in 2021

Special Marine Warning 30, NWS Grand Rapids, MI

August 11, 2021

NWS Grand Rapids, MI issued this special marine warning at Aug 11, 2021, 6:26 PM EDT. It was in force for 2 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Aug 11, 2021, 6:26 PM EDT (22:26 UTC)
Expired: Aug 11, 2021, 8:30 PM EDT
In force: 2 hr
Issued by: NWS Grand Rapids, MI
Area: Storm-based polygon
Hail: 0.75 in
Wind: 34.0 mph

What forecasters said that day

The local office's own words before this special marine warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Grand Rapids, MI wrote its last area forecast discussion before this special marine warning went out at Aug 11, 3:45 PM EDT, 2 hours 41 minutes earlier.

Area forecast discussion, Aug 11, 3:45 PM EDT, 2 hours 41 minutes before

Area Forecast Discussion
National Weather Service Grand Rapids MI
345 PM EDT Wed Aug 11 2021

LATEST UPDATE...
Synopsis/Discussion/Marine

.SYNOPSIS...
Issued at 321 PM EDT Wed Aug 11 2021

- Risk for severe weather into Thursday night

- More seasonable over the weekend

&&

.DISCUSSION...(This evening through next Wednesday)
Issued at 321 PM EDT Wed Aug 11 2021

- Risk for severe weather into Thursday night

Based off of the SPC meso page...the combination of stronger deep
layer shear and instability building again this evening...should
support the return of strong to severe convection. The main window
for this to happen in from 8 pm to 2 am. Damaging winds are the
primary risk. Until then we will be in a decreased period for
thunderstorms.

Thursday the instability rebuilds and ML CAPE values are progged
to climb up over 1500 J/kg. This in combination with strengthening
deep layer shear will support a potential for organized convection
once again. The main window for this to happen is from 6 pm to 2
am. The surface front will be shifting southeastward through the
CWA then.

- More seasonable over the weekend

Behind the front a cool air advection will lower the temperatures.
Based on 925 mb temps the high temps will end up closer to normal.
PWAT's drop off considerably and that will allow for the overnight
temperatures too cool off as well.

&&

.AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon)
Issued at 142 PM EDT Wed Aug 11 2021

One area of storms will track through the TAF sites through 20z
leading to gusts over 35 knots along with local IFR impacts. Then
a break. However another line of storms is forecast to track
southeast through the TAF sites this evening. Gusts over 40 knots
and possible gusts in excess of 50 knots looks possible. IFR and
lower impacts will accompany the strongest cells.

&&

.MARINE...
Issued at 321 PM EDT Wed Aug 11 2021

Hazardous conditions will persist along the lakeshore into this
evening as a low level jet persists. We did expand the Beach
Hazards further south earlier this afternoon. May need to extend
the small craft into Thursday.

&&

.GRR WATCHES/WARNINGS/ADVISORIES...
MI...Beach Hazards Statement until 3 AM EDT Thursday for MIZ037-043-
     050-056-064.

LM...Small Craft Advisory until 3 AM EDT Thursday for LMZ844>849.

&&

SYNOPSIS...MJS
DISCUSSION...MJS
AVIATION...MJS
MARINE...MJS

Hazardous weather outlook, Aug 11, 12:03 PM EDT, 6 hours 23 minutes before

Hazardous Weather Outlook
National Weather Service Grand Rapids MI
1203 pM EDT Wed Aug 11 2021

MIZ037>040-043>046-050>052-056>059-064>067-071>074-120745-
Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon-
Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton-
Ingham-Van Buren-Kalamazoo-Calhoun-Jackson-
1203 p EDT Wed Aug 11 2021

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

.DAY ONE...This afternoon and Tonight

There is an Enhanced Risk of severe weather for this afternoon and
evening. The main threat will be damaging winds. Secondary threats
will be large hail, tornadoes and heavy rain.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

There is a marginal risk for severe weather on Thursday. The main
threat will be damaging winds.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this evening.

LMZ844>849-120745-
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-
1203 pM EDT Wed Aug 11 2021

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

.DAY ONE...This afternoon and Tonight

Winds and waves will create hazardous conditions for small craft
and swimmers. Thunderstorms this evening could bring wind gusts
over 40 knots.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday

Thunderstorms with strong gusty winds are possible on Thursday.

In the hours before

Local storm report, Aug 11, 2:09 PM EDT, 4 hours 17 minutes before

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Local storm report, Aug 11, 2:47 PM EDT, 3 hours 39 minutes before

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Local storm report, Aug 11, 3:15 PM EDT, 3 hours 11 minutes before

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Local storm report, Aug 11, 3:59 PM EDT, 2 hours 27 minutes before

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Local storm report, Aug 11, 4:27 PM EDT, 1 hour 59 minutes before

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Local storm report, Aug 11, 4:48 PM EDT, 1 hour 38 minutes before

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The office that day

Everything else NWS Grand Rapids, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 10, 8:46 PM EDT	Special Marine Warning	GRR		59 min
Aug 10, 9:22 PM EDT	Special Weather Statement	GRR	Allegan, Barry, Calhoun, Clare, Clinton, Eaton and 16 more	3 hr
Aug 10, 9:40 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Mason, Muskegon, Oceana, Ottawa, Van Buren	73 min
Aug 10, 10:02 PM EDT	Severe Thunderstorm Warning	GRR	Barry, Kalamazoo, Kent, Lake, Newaygo	58 min
Aug 10, 10:41 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun, Eaton, Ionia, Mecosta, Montcalm, Osceola	64 min
Aug 10, 11:09 PM EDT	Severe Thunderstorm Warning	GRR	Clare, Clinton, Gratiot, Ingham, Isabella, Jackson	66 min
Aug 11, 11:45 AM EDT	Special Marine Warning	GRR		90 min
Aug 11, 12:40 PM EDT	Special Weather Statement	GRR	Kent	65 min
Aug 11, 12:51 PM EDT	Severe Thunderstorm Warning	GRR	Allegan, Ottawa	28 min
Aug 11, 1:07 PM EDT	Special Weather Statement	GRR	Kent	83 min
Aug 11, 1:28 PM EDT	Special Weather Statement	GRR	Calhoun, Kalamazoo	62 min
Aug 11, 1:39 PM EDT	Special Weather Statement	GRR	Clinton, Eaton, Gratiot, Ingham, Ionia, Jackson and 1 more	2 hr
Aug 11, 1:56 PM EDT	Severe Thunderstorm Warning	GRR	Calhoun	38 min
Aug 11, 2:08 PM EDT	Severe Thunderstorm Warning	GRR	Jackson	58 min
Aug 11, 2:11 PM EDT	Severe Thunderstorm Warning	GRR	Clinton, Gratiot, Ionia, Montcalm	49 min
Aug 11, 2:38 PM EDT	Severe Thunderstorm Warning	GRR	Ingham	34 min
Aug 11, 7:32 PM EDT	Severe Thunderstorm Warning	GRR	Muskegon	43 min

Nearby

Special Marine Warnings in Michigan, 2021 Every special marine 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.