Alert archive / Michigan / Special Weather Statements in 2021

Special Weather Statement, NWS Grand Rapids, MI

July 13, 2021Jackson County, Michigan

NWS Grand Rapids, MI issued this special weather statement at Jul 13, 2021, 3:45 PM EDT for Jackson County, Michigan. It was in force for 60 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: Jul 13, 2021, 3:45 PM EDT (19:45 UTC)
Expired: Jul 13, 2021, 4:45 PM EDT
In force: 60 min
Issued by: NWS Grand Rapids, MI

County Jackson County, MI

The radar

The Detroit radar (KDTX), 89 km from the middle of the area, began a volume at 19:45 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 12:00Z, 7.8 hours before the alert went out and 93 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: 749 J/kg
Mixed-layer CIN: -22 J/kg
Mixed-layer LCL: 630 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 98 m²/s²
0-3 km storm-relative helicity: 116 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.8

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 Jul 13, 3:19 PM EDT, 26 minutes earlier.

Area forecast discussion, Jul 13, 3:19 PM EDT, 26 minutes before

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Hazardous weather outlook, Jul 13, 11:00 AM EDT, 4 hours 45 minutes before

Hazardous Weather Outlook
National Weather Service Grand Rapids MI
1100 AM EDT Tue Jul 13 2021

MIZ037>040-043>046-050>052-056>059-064>067-071>074-140815-
Mason-Lake-Osceola-Clare-Oceana-Newaygo-Mecosta-Isabella-Muskegon-
Montcalm-Gratiot-Ottawa-Kent-Ionia-Clinton-Allegan-Barry-Eaton-
Ingham-Van Buren-Kalamazoo-Calhoun-Jackson-
1100 AM EDT Tue Jul 13 2021

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

.DAY ONE...This afternoon and Tonight

A marginal risk for severe thunderstorms exists this afternoon
mainly east of a Lansing to Battle Creek line.  Damaging winds are
the primary threat.  Further west a few strong storms are possible
with gusty winds and occasional cloud to ground lightning strikes
the main concern.   Locally excessive rain is possible throughout
Southwest Lower MI this afternoon.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorms will become possible again later Wednesday night and
Thursday. Some of these storms could become locally strong to
severe on Thursday afternoon.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will be possible on Thursday afternoon.

LMZ844>849-140815-
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-
1100 AM EDT Tue Jul 13 2021

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

.DAY ONE...This afternoon and Tonight

Thunderstorms will be possible through this afternoon across the
area. Severe weather is not expected. Lightning will be the main
threat, with small hail and wind gusts of 40 mph possible.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Thunderstorms will become possible again later Wednesday night and
Thursday. Some of these storms could become locally strong to
severe.

Winds and waves will become hazardous to Small Craft late Wednesday
night and on Thursday.  Hazardous swim conditions are also possible
for the same period.

In the hours before

Local storm report, Jul 13, 12:16 PM EDT, 3 hours 29 minutes before

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Local storm report, Jul 13, 12:17 PM EDT, 3 hours 28 minutes before

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Special weather statement, Jul 13, 1:18 PM EDT, 2 hours 27 minutes before

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Local storm report, Jul 13, 2:09 PM EDT, 1 hour 36 minutes before

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Special weather statement, Jul 13, 2:26 PM EDT, 1 hour 19 minutes before

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Special weather statement, Jul 13, 3:45 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
Jul 13, 11:40 AM EDT	Special Weather Statement	GRR	Barry, Ionia, Kalamazoo	2 hr
Jul 13, 1:18 PM EDT	Special Weather Statement	GRR	Calhoun, Eaton	57 min
Jul 13, 2:26 PM EDT	Special Weather Statement	GRR	Calhoun, Ingham	64 min
Jul 13, 5:37 PM EDT	Marine Dense Fog Advisory	GRR		11 hr

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.