Alert archive / Michigan / Special Weather Statements in 2021

Special Weather Statement, NWS Grand Rapids, MI

August 28, 2021Clinton County, Michigan

NWS Grand Rapids, MI issued this special weather statement at Aug 28, 2021, 11:14 PM EDT for Clinton County, Michigan. It was in force for 61 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 28, 2021, 11:14 PM EDT (03:14 UTC)
Expired: Aug 29, 2021, 12:15 AM EDT
In force: 61 min
Issued by: NWS Grand Rapids, MI
Hail: 0.25 in
Wind: 40

County Clinton County, MI

The radar

The Grand Rapids radar (KGRR), 66 km from the middle of the area, began a volume at 03:15 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.

The nearest sounding before it

Detroit, MI (KDTX), launched 00:00Z, 3.2 hours before the alert went out and 117 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1935 J/kg
Mixed-layer CIN: -7 J/kg
Mixed-layer LCL: 1213 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 57 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 weather statement went out at Aug 28, 9:25 PM EDT, 1 hour 49 minutes earlier.

Area forecast discussion, Aug 28, 9:25 PM EDT, 1 hour 49 minutes before

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Hazardous weather outlook, Aug 28, 11:30 AM EDT, 11 hours 44 minutes before

Hazardous Weather Outlook
National Weather Service Grand Rapids MI
1130 AM EDT Sat Aug 28 2021

MIZ037>040-043>046-050>052-056>059-064>067-071>074-290930-
Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon-
Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton-
Ingham-Van Buren-Kalamazoo-Calhoun-Jackson-
1130 AM EDT Sat Aug 28 2021

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

.DAY ONE...This Afternoon and Tonight

A Heat Advisory remains in effect for this afternoon as heat index
values of around 100 degrees are predicted.

A few thunderstorms are possible this afternoon and evening.  A
marginal risk for severe weather exists...mainly to the north of a
Muskegon to Alma line.  Damaging winds are the primary risk.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

A line of thunderstorms, a few of which could be strong to severe,
is looking likely Sunday afternoon and evening. Strong wind gusts
and hail are the main threats.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Sunday afternoon and evening.

LMZ844>849-290930-
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-
1130 AM EDT Sat Aug 28 2021

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

.DAY ONE...This afternoon and Tonight

A moderate risk for hazardous swim conditions exists this afternoon.

A few thunderstorms are possible this afternoon and evening. Locally
gusty winds and frequent lightning are possible.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Stronger thunderstorms are possible along a cold front Sunday
afternoon and evening. Gusty winds and hail are the primary
threats.

Dangerous swim conditions are predicted for Sunday.  Conditions will
be hazardous for small craft as well.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed Sunday afternoon and evening.

In the hours before

Local storm report, Aug 28, 9:30 PM EDT, 1 hour 44 minutes before

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Local storm report, Aug 28, 9:31 PM EDT, 1 hour 43 minutes before

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Local storm report, Aug 28, 9:34 PM EDT, 1 hour 40 minutes before

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Local storm report, Aug 28, 9:49 PM EDT, 1 hour 25 minutes before

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Local storm report, Aug 28, 10:02 PM EDT, 1 hour 12 minutes before

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Special weather statement, Aug 28, 11:14 PM EDT, 0 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 28, 9:02 PM EDT	Special Weather Statement	GRR	Clinton	58 min
Aug 29, 2:21 AM EDT	Areal Flood Advisory	GRR	Mason	5 hr
Aug 29, 1:54 PM EDT	Special Marine Warning	GRR		2 hr
Aug 29, 2:33 PM EDT	Flash Flood Warning Considerable damage threat	GRR	Lake	8 hr
Aug 29, 2:49 PM EDT	Special Marine Warning	GRR		113 min
Aug 29, 3:11 PM EDT	Areal Flood Warning	GRR	Mason	17 hr
Aug 29, 3:18 PM EDT	Severe Thunderstorm Warning	GRR	Muskegon	28 min
Aug 29, 3:26 PM EDT	Severe Thunderstorm Warning	GRR	Barry, Ionia, Kent	28 min
Aug 29, 4:04 PM EDT	Severe Thunderstorm Warning	GRR	Clinton, Ionia	56 min
Aug 29, 5:21 PM EDT	Severe Thunderstorm Warning	GRR	Ingham	24 min

Nearby

Special Weather Statements in Michigan, 2021 Every special weather statement 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.