Alert archive / Tennessee / Heat Advisories in 2017

Heat Advisory 5, NWS Memphis, TN

July 24, 201712 counties in Tennessee; 8 counties in Mississippi; 12 counties in Arkansas

NWS Memphis, TN issued this heat advisory at Jul 24, 2017, 3:22 PM CDT for 12 counties in Tennessee; 8 counties in Mississippi; 12 counties in Arkansas. It took effect at Jul 25, 2017, 1:00 PM CDT. It was in force for 53 hr.

The area

The counties it named.

The facts

Issued: Jul 24, 2017, 3:22 PM CDT (20:22 UTC)
In effect from: Jul 25, 2017, 1:00 PM CDT
Expired: Jul 27, 2017, 5:37 PM CDT
In force: 53 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, Marshall County, MS, Panola County, MS, Quitman County, MS, Tallahatchie County, MS, Tate County, MS, Tunica County, MS, Crockett County, TN, Dyer County, TN, Fayette County, TN, Gibson County, TN, Haywood County, TN, Lake County, TN, Lauderdale County, TN, Madison County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 13 km from the middle of the area, began a volume at 20:22 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

Jackson, MS (KJAN), launched 12:00Z, 8.4 hours before the alert went out and 340 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: 279 J/kg
Mixed-layer CIN: -47 J/kg
Mixed-layer LCL: 794 m above ground
0-6 km bulk shear: 6 kt
0-1 km storm-relative helicity: -8 m²/s²
0-3 km storm-relative helicity: 35 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 24, 12:35 PM CDT, 2 hours 47 minutes earlier.

Area forecast discussion, Jul 24, 12:35 PM CDT, 2 hours 47 minutes before

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Hazardous weather outlook, Jul 24, 3:53 AM CDT, 11 hours 29 minutes before

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In the hours before

Local storm report, Jul 24, 2:58 PM CDT, 24 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 23, 7:01 PM CDT	Special Weather Statement	MEG	Haywood	44 min
Jul 23, 7:11 PM CDT	Areal Flood Advisory	MEG	Chester, Hardeman, Haywood, Madison	2 hr
Jul 23, 10:24 PM CDT	Areal Flood Advisory	MEG	Shelby	51 min
Jul 23, 7:15 PM CDT	Special Weather Statement	MEG	DeSoto	15 min
Jul 23, 9:32 PM CDT	Special Weather Statement	MEG	Tate	28 min
Jul 23, 9:37 PM CDT	Areal Flood Advisory	MEG	Tunica	53 min
Jul 23, 7:54 PM CDT	Special Weather Statement	MEG	Lee	36 min
Jul 23, 8:40 PM CDT	Special Weather Statement	MEG	Lee	50 min

Nearby

Heat Advisories in Tennessee, 2017 Heat Advisories in Arkansas, 2017 Heat Advisories in Mississippi, 2017 Every heat advisory in 2017

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.