Alert archive / Michigan / Excessive Heat Warnings in 2012

Excessive Heat Warning 1, NWS Grand Rapids, MI

July 3, 201215 counties in Michigan

NWS Grand Rapids, MI issued this excessive heat warning at Jul 3, 2012, 10:46 AM EDT for 15 counties in Michigan. It took effect at Jul 3, 2012, 2:00 PM EDT. It was in force for 4 days. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 3, 2012, 10:46 AM EDT (14:46 UTC)
In effect from: Jul 3, 2012, 2:00 PM EDT
Expired: Jul 7, 2012, 8:00 PM EDT
In force: 4 days
Issued by: NWS Grand Rapids, MI

Counties Allegan County, MI, Barry County, MI, Calhoun County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Montcalm County, MI, Muskegon County, MI, Ottawa County, MI, Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 28 km from the middle of the area, began a volume at 14:46 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, 2.8 hours before the alert went out and 150 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: 745 J/kg
Mixed-layer CIN: -107 J/kg
Mixed-layer LCL: 1309 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 119 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat 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 excessive heat warning went out at Jul 3, 7:38 AM EDT, 3 hours 8 minutes earlier.

Area forecast discussion, Jul 3, 7:38 AM EDT, 3 hours 8 minutes before

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Hazardous weather outlook, Jul 3, 5:15 AM EDT, 5 hours 31 minutes before

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In the hours before

Local storm report, Jul 3, 4:50 AM EDT, 5 hours 56 minutes before

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Local storm report, Jul 3, 5:05 AM EDT, 5 hours 41 minutes before

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Special weather statement, Jul 3, 5:32 AM EDT, 5 hours 14 minutes before

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Local storm report, Jul 3, 6:20 AM EDT, 4 hours 26 minutes before

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Special weather statement, Jul 3, 6:35 AM EDT, 4 hours 11 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 3, 2:10 AM EDT	Special Weather Statement	GRR	Clare, Isabella, Mecosta, Osceola	65 min
Jul 3, 3:45 AM EDT	Special Weather Statement	GRR	Clare, Gratiot, Isabella, Montcalm	60 min
Jul 3, 4:40 AM EDT	Special Weather Statement	GRR	Gratiot	50 min
Jul 3, 5:32 AM EDT	Special Weather Statement	GRR	Lake, Osceola	58 min
Jul 3, 6:35 AM EDT	Special Weather Statement	GRR	Clare	55 min
Jul 3, 10:46 AM EDT	Excessive Heat Watch	GRR	Clare, Clinton, Gratiot, Ionia, Isabella, Kent and 9 more	17 hr
Jul 3, 4:54 PM EDT	Special Weather Statement	GRR	Ingham	66 min
Jul 3, 5:06 PM EDT	Severe Thunderstorm Warning	GRR	Ingham, Jackson	24 min

Nearby

Excessive Heat Warnings in Michigan, 2012 Every excessive heat warning 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.