Alert archive / Michigan / Heat Advisories in 2011

Heat Advisory 4, NWS Grand Rapids, MI

September 2, 201119 counties in Michigan

NWS Grand Rapids, MI issued this heat advisory at Sep 2, 2011, 4:20 AM EDT for 19 counties in Michigan. It took effect at Sep 2, 2011, 11:00 AM EDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued: Sep 2, 2011, 4:20 AM EDT (08:20 UTC)
In effect from: Sep 2, 2011, 11:00 AM EDT
Expired: Sep 2, 2011, 5:08 PM EDT
In force: 6 hr
Issued by: NWS Grand Rapids, MI

Counties Allegan County, MI, Barry County, MI, Calhoun County, MI, Clare County, MI, Clinton County, MI, Eaton County, MI, Gratiot County, MI, Ingham County, MI, Ionia County, MI, Isabella County, MI, Jackson County, MI, Kalamazoo County, MI, Kent County, MI, Lake County, MI, Mecosta County, MI, Montcalm County, MI, Newaygo County, MI, Osceola County, MI, Van Buren County, MI

The radar

The Grand Rapids radar (KGRR), 33 km from the middle of the area, began a volume at 08:23 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, 8.3 hours before the alert went out and 148 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: 128 J/kg
Mixed-layer CIN: -308 J/kg
Mixed-layer LCL: 1769 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 35 m²/s²
0-3 km storm-relative helicity: 82 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this heat advisory 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 heat advisory went out at Sep 1, 11:58 PM EDT, 4 hours 22 minutes earlier.

Area forecast discussion, Sep 1, 11:58 PM EDT, 4 hours 22 minutes before

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Hazardous weather outlook, Sep 2, 1:37 AM EDT, 2 hours 43 minutes before

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In the hours before

Special weather statement, Sep 2, 1:53 AM EDT, 2 hours 27 minutes before

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Special weather statement, Sep 2, 3:04 AM EDT, 1 hour 16 minutes before

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Special weather statement, Sep 2, 3:44 AM EDT, 36 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
Sep 2, 1:53 AM EDT	Special Weather Statement	GRR	Clare, Gratiot, Isabella, Lake, Mecosta, Montcalm and 4 more	52 min
Sep 2, 3:04 AM EDT	Special Weather Statement	GRR	Gratiot, Isabella, Mecosta, Montcalm	56 min
Sep 2, 3:44 AM EDT	Special Weather Statement	GRR	Gratiot, Montcalm	61 min
Sep 2, 11:44 AM EDT	Special Marine Warning	GRR		91 min
Sep 2, 11:48 AM EDT	Special Weather Statement	GRR	Lake, Mason, Oceana	87 min
Sep 2, 12:39 PM EDT	Special Weather Statement	GRR	Mecosta, Newaygo, Osceola	81 min

Nearby

Heat Advisories in Michigan, 2011 Every heat advisory in 2011

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.