Alert archive / Mississippi / Heat Advisories in 2017

Heat Advisory 7, NWS Memphis, TN

July 26, 201712 counties in Tennessee; 14 counties in Mississippi; Crittenden County, Cross County, Arkansas

NWS Memphis, TN issued this heat advisory at Jul 26, 2017, 11:55 AM CDT for 12 counties in Tennessee; 14 counties in Mississippi; Crittenden County, Cross County, Arkansas. It took effect at Jul 26, 2017, 5:32 PM CDT. It was in force for 24 hr.

The area

The counties it named.

The facts

Issued
Jul 26, 2017, 11:55 AM CDT (16:55 UTC)
In effect from
Jul 26, 2017, 5:32 PM CDT
Expired
Jul 27, 2017, 5:37 PM CDT
In force
24 hr
Issued by
NWS Memphis, TN
All 28 counties

Crittenden County, AR, Cross County, AR, Alcorn County, MS, Benton County, MS, Calhoun County, MS, Chickasaw County, MS, Itawamba County, MS, Lafayette County, MS, Lee County, MS, Monroe County, MS, Pontotoc County, MS, Prentiss County, MS, Tippah County, MS, Tishomingo County, MS, Union County, MS, Yalobusha County, MS, Benton County, TN, Carroll County, TN, Chester County, TN, Decatur County, TN, Hardeman County, TN, Hardin County, TN, Henderson County, TN, Henry County, TN, Lauderdale County, TN, McNairy County, TN, Shelby County, TN, Tipton County, TN

The radar

The Memphis radar (KNQA), 95 km from the middle of the area, began a volume at 16:58 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

Birmingham, AL (KBMX), launched 12:00Z, 4.9 hours before the alert went out and 281 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-pSkew-T log-p diagram, Birmingham, AL at 12:00Z on 2017-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1729 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Birmingham, AL at 12:00Z on 2017-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 39 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
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
1729 J/kg
Mixed-layer CIN
-51 J/kg
Mixed-layer LCL
961 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
39 m²/s²
0-3 km storm-relative helicity
23 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 25, 6:29 PM CDT, 17 hours 26 minutes earlier.

Area forecast discussion, Jul 25, 6:29 PM CDT, 17 hours 26 minutes before
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Hazardous weather outlook, Jul 25, 3:45 PM CDT, 20 hours 10 minutes before
Hazardous Weather Outlook
National Weather Service Memphis TN
345 PM CDT Tue Jul 25 2017

ARZ008-009-017-018-026>028-035-036-048-049-058-MOZ113-115-
MSZ001>017-020>024-TNZ001>004-019>022-048>055-088>092-261100-
Alcorn-Benton MS-Benton TN-Calhoun-Carroll-Chester-Chickasaw-Clay-
Coahoma-Craighead-Crittenden-Crockett-Cross-DeSoto-Decatur-
Dunklin-Dyer-Fayette-Gibson-Greene-Hardeman-Hardin-Haywood-
Henderson-Henry-Itawamba-Lafayette-Lake-Lauderdale-Lawrence-
Lee AR-Lee MS-Madison-Marshall-McNairy-Mississippi-Monroe-Obion-
Panola-Pemiscot-Phillips-Poinsett-Pontotoc-Prentiss-Quitman-
Randolph-Shelby-St. Francis-Tallahatchie-Tate-Tippah-Tipton-
Tishomingo-Tunica-Union-Weakley-Yalobusha-
345 PM CDT Tue Jul 25 2017

This hazardous weather outlook is for portions of East Arkansas...
the Missouri Bootheel...North Mississippi...and West Tennessee.

.DAY ONE...This Afternoon and Tonight

Dangerous heat will continue across the Mid-South through early
evening. A Heat Advisory is in effect for most of the area along
and west of the Mississippi River, where heat indices of 105 to
109 degrees are expected. A portion of northeast Arkansas and the
Missouri Bootheel are in an Excessive Heat Warning through 8 PM
where heat indices will be near or just over 110 degrees.

A few strong to severe storms are possible through early evening.
The primary hazards will be strong winds and locally heavy
rainfall.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Heat indices of 105 to 109 degrees are expected across portions of
the Mid-South on Wednesday. A Heat Advisory is in effect for
locations roughly along and west of a line from Martin, to
Jackson, to Somerville, to Clarksdale. This advisory will likely
need to be expanded into Thursday.

A cold front is forecast to move across the Mid-South Thursday
night into Friday, bringing a chance for a few strong to severe
thunderstorms and heavy rainfall.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be possible Thursday night and into Friday.

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 26, 2:31 AM CDTExcessive Heat WarningMEGLauderdale, Shelby, Tipton15 hr
Jul 26, 3:15 PM CDTSpecial Weather StatementMEGHardin30 min
Jul 26, 5:54 PM CDTSpecial Weather StatementMEGHardin36 min
Jul 26, 3:39 PM CDTSpecial Weather StatementMEGAlcorn21 min
Jul 26, 4:01 PM CDTSpecial Weather StatementMEGAlcorn29 min

Nearby

Heat Advisories in Mississippi, 2017Heat Advisories in Tennessee, 2017Heat Advisories in Arkansas, 2017Every 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.