Alert archive / Arkansas / Heat Advisories in 2012

Heat Advisory 10, NWS Memphis, TN

August 4, 201210 counties in Mississippi; 10 counties in Tennessee; 12 counties in Arkansas

NWS Memphis, TN issued this heat advisory at Aug 4, 2012, 3:36 AM CDT for 10 counties in Mississippi; 10 counties in Tennessee; 12 counties in Arkansas. It took effect at Aug 4, 2012, 12:00 PM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Aug 4, 2012, 3:36 AM CDT (08:36 UTC)
In effect from: Aug 4, 2012, 12:00 PM CDT
Expired: Aug 4, 2012, 7:00 PM CDT
In force: 7 hr
Issued by: NWS Memphis, TN

All 32 counties

Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Lawrence County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett County, AR, Randolph County, AR, St. Francis County, AR, Coahoma County, MS, DeSoto County, MS, Lafayette County, MS, Marshall County, MS, Panola County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Yalobusha County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 19 km from the middle of the area, began a volume at 08:35 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

Nashville Metro, TN (KBNA), launched 00:00Z, 8.6 hours before the alert went out and 327 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: 2425 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1056 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 26 m²/s²
0-3 km storm-relative helicity: 66 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 Memphis, TN wrote its last area forecast discussion before this heat advisory went out at Aug 4, 12:12 AM CDT, 3 hours 24 minutes earlier.

Area forecast discussion, Aug 4, 12:12 AM CDT, 3 hours 24 minutes before

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Hazardous weather outlook, Aug 3, 7:03 PM CDT, 8 hours 33 minutes before

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The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 4, 3:25 PM CDT	Special Weather Statement	MEG	Monroe	35 min
Aug 4, 4:30 PM CDT	Special Weather Statement	MEG	Itawamba	30 min

Nearby

Heat Advisories in Arkansas, 2012 Heat Advisories in Mississippi, 2012 Heat Advisories in Tennessee, 2012 Every heat advisory 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.