Alert archive / Arkansas / Excessive Heat Warnings in 2018

Excessive Heat Warning 3, NWS Memphis, TN

July 20, 2018Lauderdale County, Shelby County, Tipton County, Tennessee; 7 counties in Mississippi; 12 counties in Arkansas

NWS Memphis, TN issued this excessive heat warning at Jul 20, 2018, 3:34 AM CDT for Lauderdale County, Shelby County, Tipton County, Tennessee; 7 counties in Mississippi; 12 counties in Arkansas. It took effect at Jul 20, 2018, 11:00 AM CDT. It was in force for 9 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 20, 2018, 3:34 AM CDT (08:34 UTC)
In effect from: Jul 20, 2018, 11:00 AM CDT
Expired: Jul 20, 2018, 8:00 PM CDT
In force: 9 hr
Issued by: NWS Memphis, TN

All 22 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, Panola County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Lauderdale County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 50 km from the middle of the area, began a volume at 08:36 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, 8.6 hours before the alert went out and 57 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: 3860 J/kg
Mixed-layer CIN: -16 J/kg
Mixed-layer LCL: 1358 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 237 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 21.5

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this excessive heat warning 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 excessive heat warning went out at Jul 20, 3:29 AM CDT, 5 minutes earlier.

Area forecast discussion, Jul 20, 3:29 AM CDT, 5 minutes before

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Hazardous weather outlook, Jul 19, 11:07 PM CDT, 4 hours 27 minutes before

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In the hours before

Special weather statement, Jul 19, 10:19 PM CDT, 5 hours 15 minutes before

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Special weather statement, Jul 19, 10:56 PM CDT, 4 hours 38 minutes before

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Special weather statement, Jul 19, 11:20 PM CDT, 4 hours 14 minutes before

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Special weather statement, Jul 19, 11:39 PM CDT, 3 hours 55 minutes before

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Special weather statement, Jul 19, 11:40 PM CDT, 3 hours 54 minutes before

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Local storm report, Jul 20, 1:16 AM CDT, 2 hours 18 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 19, 7:02 PM CDT	Special Weather Statement	MEG	Weakley	43 min
Jul 19, 7:21 PM CDT	Special Weather Statement	MEG	Obion	24 min
Jul 19, 7:29 PM CDT	Special Weather Statement	MEG	Henry	46 min
Jul 19, 7:37 PM CDT	Special Weather Statement	MEG	Gibson	38 min
Jul 19, 7:54 PM CDT	Areal Flood Advisory	MEG	Fayette, Shelby	82 min
Jul 19, 7:55 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Shelby	50 min
Jul 19, 8:09 PM CDT	Special Weather Statement	MEG	Gibson	51 min
Jul 19, 8:21 PM CDT	Special Weather Statement	MEG	Henry	39 min
Jul 19, 8:26 PM CDT	Special Weather Statement	MEG	Fayette	49 min
Jul 19, 8:35 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Shelby	29 min
Jul 19, 8:51 PM CDT	Special Weather Statement	MEG	Hardeman	39 min
Jul 19, 9:51 PM CDT	Special Weather Statement	MEG	Haywood	24 min
Jul 19, 10:13 PM CDT	Severe Thunderstorm Warning	MEG	Fayette, Hardeman, Haywood, Madison	18 min
Jul 19, 7:01 PM CDT	Special Weather Statement	MEG	Marshall	44 min
Jul 19, 7:36 PM CDT	Special Weather Statement	MEG	Marshall	39 min
Jul 19, 8:00 PM CDT	Special Weather Statement	MEG	Coahoma	45 min
Jul 19, 8:11 PM CDT	Special Weather Statement	MEG	Benton	49 min
Jul 19, 8:13 PM CDT	Special Weather Statement	MEG	Quitman	47 min
Jul 19, 8:48 PM CDT	Severe Thunderstorm Warning	MEG	Coahoma, Quitman	42 min
Jul 19, 8:50 PM CDT	Special Weather Statement	MEG	Tippah	40 min
Jul 19, 8:59 PM CDT	Special Weather Statement	MEG	Tate	46 min
Jul 19, 9:01 PM CDT	Special Weather Statement	MEG	Panola, Quitman	44 min
Jul 19, 9:29 PM CDT	Severe Thunderstorm Warning	MEG	Coahoma	29 min
Jul 19, 9:30 PM CDT	Severe Thunderstorm Warning	MEG	Panola, Tate	45 min
Jul 19, 9:32 PM CDT	Special Weather Statement	MEG	Lafayette	43 min
Jul 19, 9:46 PM CDT	Severe Thunderstorm Warning	MEG	Calhoun, Lafayette, Panola, Yalobusha	33 min
Jul 19, 10:19 PM CDT	Special Weather Statement	MEG	Lafayette, Panola	41 min
Jul 19, 10:56 PM CDT	Special Weather Statement	MEG	Yalobusha	49 min
Jul 19, 11:20 PM CDT	Special Weather Statement	MEG	Pontotoc	40 min
Jul 19, 11:39 PM CDT	Special Weather Statement	MEG	Yalobusha	51 min
Jul 19, 11:40 PM CDT	Special Weather Statement	MEG	Pontotoc, Union	50 min
Jul 20, 11:50 AM CDT	Special Weather Statement	MEG	Coahoma	40 min

Nearby

Excessive Heat Warnings in Arkansas, 2018 Excessive Heat Warnings in Mississippi, 2018 Excessive Heat Warnings in Tennessee, 2018 Every excessive heat warning in 2018

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.