Alert archive / Michigan / Heat Advisories in 2011

Heat Advisory 1, NWS Gaylord, MI

July 19, 201122 counties in Michigan

NWS Gaylord, MI issued this heat advisory at Jul 19, 2011, 4:21 AM EDT for 22 counties in Michigan. It took effect at Jul 20, 2011, 11:00 AM EDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued: Jul 19, 2011, 4:21 AM EDT (08:21 UTC)
In effect from: Jul 20, 2011, 11:00 AM EDT
Expired: Jul 21, 2011, 11:14 AM EDT
In force: 24 hr
Issued by: NWS Gaylord, MI

All 22 counties

Alcona County, MI, Alpena County, MI, Antrim County, MI, Arenac County, MI, Benzie County, MI, Cheboygan County, MI, Crawford County, MI, Emmet County, MI, Gladwin County, MI, Grand Traverse County, MI, Iosco County, MI, Kalkaska County, MI, Leelanau County, MI, Manistee County, MI, Missaukee County, MI, Montmorency County, MI, Ogemaw County, MI, Oscoda County, MI, Otsego County, MI, Presque Isle County, MI, Roscommon County, MI, Wexford County, MI

The radar

The NCL Michigan radar (KAPX), 21 km from the middle of the area, began a volume at 08:27 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, 8.4 hours before the alert went out and 244 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: 1993 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 1085 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 182 m²/s²
0-3 km storm-relative helicity: 267 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 12.7

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 Gaylord, MI wrote its last area forecast discussion before this heat advisory went out at Jul 19, 4:08 AM EDT, 13 minutes earlier.

Area forecast discussion, Jul 19, 4:08 AM EDT, 13 minutes before

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Hazardous weather outlook, Jul 18, 10:37 PM EDT, 5 hours 44 minutes before

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The office that day

Everything else NWS Gaylord, MI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jul 19, 4:21 AM EDT	Dense Fog Advisory	APX	Alcona, Alpena, Antrim, Arenac, Benzie, Cheboygan and 16 more	7 hr
Jul 19, 4:22 AM EDT	Marine Dense Fog Advisory	APX		7 hr

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.