Alert archive / Mississippi / Heat Advisories in 2012

Heat Advisory 3, NWS Memphis, TN

July 18, 201222 counties in Mississippi; 20 counties in Tennessee; 12 counties in Arkansas

NWS Memphis, TN issued this heat advisory at Jul 18, 2012, 3:27 AM CDT for 22 counties in Mississippi; 20 counties in Tennessee; 12 counties in Arkansas. It took effect at Jul 18, 2012, 10:30 AM CDT. It was in force for 3 days.

The area

The counties it named.

The facts

Issued: Jul 18, 2012, 3:27 AM CDT (08:27 UTC)
In effect from: Jul 18, 2012, 10:30 AM CDT
Expired: Jul 21, 2012, 3:04 PM CDT
In force: 3 days
Issued by: NWS Memphis, TN

All 54 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, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Coahoma County, MS, DeSoto County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Marshall County, MS, Monroe County, MS, Panola County, MS, Pontotoc County, MS, Prentiss County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tippah County, MS, Tishomingo County, MS, Tunica County, MS, Union County, MS, Yalobusha County, MS, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 41 km from the middle of the area, began a volume at 08:33 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, 8.5 hours before the alert went out and 283 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: 2483 J/kg
Mixed-layer CIN: -6 J/kg
Mixed-layer LCL: 1532 m above ground
0-6 km bulk shear: 12 kt
0-1 km storm-relative helicity: -18 m²/s²
0-3 km storm-relative helicity: -11 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 Jul 18, 2:48 AM CDT, 39 minutes earlier.

Area forecast discussion, Jul 18, 2:48 AM CDT, 39 minutes before

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Hazardous weather outlook, Jul 17, 6:20 PM CDT, 9 hours 7 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
Jul 18, 4:51 PM CDT	Special Weather Statement	MEG	Prentiss	24 min
Jul 18, 4:56 PM CDT	Severe Thunderstorm Warning	MEG	Itawamba, Prentiss, Tishomingo	30 min
Jul 18, 5:07 PM CDT	Special Weather Statement	MEG	Benton	53 min
Jul 18, 5:53 PM CDT	Special Weather Statement	MEG	Union	52 min
Jul 18, 6:36 PM CDT	Special Weather Statement	MEG	Lafayette	39 min
Jul 18, 4:37 PM CDT	Special Weather Statement	MEG	Hardin	23 min
Jul 18, 4:43 PM CDT	Severe Thunderstorm Warning	MEG	Hardin	29 min
Jul 18, 5:03 PM CDT	Flash Flood Warning	MEG	Hardin	3 hr
Jul 18, 6:02 PM CDT	Flash Flood Warning	MEG	Decatur, Hardin, Henderson	3 hr
Jul 18, 6:09 PM CDT	Flash Flood Warning	MEG	Henry	3 hr
Jul 18, 6:48 PM CDT	Severe Thunderstorm Warning	MEG	Carroll, Decatur, Henderson	42 min
Jul 18, 6:51 PM CDT	Severe Thunderstorm Warning	MEG	Henry	22 min

Nearby

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