Alert archive / Michigan / Special Weather Statements in 2012

Special Weather Statement, NWS Grand Rapids, MI

April 16, 2012Isabella County, Michigan

NWS Grand Rapids, MI issued this special weather statement at Apr 16, 2012, 12:22 AM EDT for Isabella County, Michigan. It was in force for 53 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: Apr 16, 2012, 12:22 AM EDT (04:22 UTC)
Expired: Apr 16, 2012, 1:15 AM EDT
In force: 53 min
Issued by: NWS Grand Rapids, MI

County Isabella County, MI

The radar

The Grand Rapids radar (KGRR), 107 km from the middle of the area, began a volume at 04:25 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

Green Bay/Straub, WI (KGRB), launched 00:00Z, 4.4 hours before the alert went out and 285 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: 744 J/kg
Mixed-layer CIN: -92 J/kg
Mixed-layer LCL: 971 m above ground
0-6 km bulk shear: 66 kt
0-1 km storm-relative helicity: 329 m²/s²
0-3 km storm-relative helicity: 519 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 12.4

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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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 Apr 15, 10:55 PM EDT, 1 hour 27 minutes earlier.

Area forecast discussion, Apr 15, 10:55 PM EDT, 1 hour 27 minutes before

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Hazardous weather outlook, Apr 15, 4:35 PM EDT, 7 hours 47 minutes before

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In the hours before

Local storm report, Apr 15, 8:35 PM EDT, 3 hours 47 minutes before

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Special weather statement, Apr 15, 11:02 PM EDT, 1 hour 20 minutes before

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Special weather statement, Apr 16, 12:07 AM EDT, 15 minutes before

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Special weather statement, Apr 16, 12:22 AM 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
Apr 15, 11:02 PM EDT	Special Weather Statement	GRR	Kent, Ottawa	58 min
Apr 16, 12:07 AM EDT	Special Weather Statement	GRR	Clare, Isabella, Montcalm	53 min
Apr 16, 1:10 AM EDT	Wind Advisory	GRR	Allegan, Barry, Calhoun, Clare, Clinton, Eaton and 17 more	19 hr
Apr 16, 4:22 PM EDT	Frost Advisory	GRR	Allegan, Barry, Calhoun, Clinton, Eaton, Ingham and 6 more	17 hr
Apr 16, 4:22 PM EDT	Freeze Warning	GRR	Clare, Gratiot, Isabella, Lake, Mason, Mecosta and 5 more	17 hr

Nearby

Special Weather Statements in Michigan, 2012 Every special weather statement in 2012

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.