Alert archive / Arkansas / Heat Advisories in 2012

Heat Advisory 9, NWS Memphis, TN

August 3, 2012Coahoma County, Mississippi; 10 counties in Arkansas

NWS Memphis, TN issued this heat advisory at Aug 3, 2012, 3:56 AM CDT for Coahoma County, Mississippi; 10 counties in Arkansas. It took effect at Aug 3, 2012, 12:00 PM CDT. It was in force for 7 hr.

The area

The counties it named.

The facts

Issued: Aug 3, 2012, 3:56 AM CDT (08:56 UTC)
In effect from: Aug 3, 2012, 12:00 PM CDT
Expired: Aug 3, 2012, 7:00 PM CDT
In force: 7 hr
Issued by: NWS Memphis, TN

Counties Clay County, AR, Craighead County, AR, Cross County, AR, Greene County, AR, Lawrence County, AR, Lee County, AR, Phillips County, AR, Poinsett County, AR, Randolph County, AR, St. Francis County, AR, Coahoma County, MS

The radar

The Memphis radar (KNQA), 80 km from the middle of the area, began a volume at 08:57 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

Little Rock, AR (KBYH), launched 00:00Z, 8.9 hours before the alert went out and 100 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: 565 J/kg
Mixed-layer CIN: -249 J/kg
Mixed-layer LCL: 2587 m above ground
0-6 km bulk shear: 23 kt
0-1 km storm-relative helicity: 69 m²/s²
0-3 km storm-relative helicity: 254 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 2, 11:48 PM CDT, 4 hours 8 minutes earlier.

Area forecast discussion, Aug 2, 11:48 PM CDT, 4 hours 8 minutes before

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Hazardous weather outlook, Aug 2, 3:39 PM CDT, 12 hours 17 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 3, 3:18 PM CDT	Special Weather Statement	MEG	Monroe	27 min
Aug 3, 7:06 AM CDT	Severe Thunderstorm Warning	MEG	Crockett, Dyer, Gibson	39 min
Aug 3, 8:15 AM CDT	Special Weather Statement	MEG	Hardeman	30 min
Aug 3, 4:13 PM CDT	Special Weather Statement	MEG	Clay	32 min

Nearby

Heat Advisories in Arkansas, 2012 Heat Advisories in Mississippi, 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.