Alert archive / Arkansas / Heat Advisories in 2021
Heat Advisory 15, NWS Memphis, TN
NWS Memphis, TN issued this heat advisory at Aug 24, 2021, 3:07 PM CDT for 8 counties in Mississippi; 6 counties in Tennessee; 10 counties in Arkansas. It took effect at Aug 25, 2021, 11:00 AM CDT. It was in force for 9 hr.
The area
The counties it named.
The facts
- Issued
- Aug 24, 2021, 3:07 PM CDT (20:07 UTC)
- In effect from
- Aug 25, 2021, 11:00 AM CDT
- Expired
- Aug 25, 2021, 7:45 PM CDT
- In force
- 9 hr
- Issued by
- NWS Memphis, TN
All 24 counties
Clay County, AR, Craighead County, AR, Crittenden County, AR, Cross County, AR, Greene County, AR, Lee County, AR, Mississippi County, AR, Phillips County, AR, Poinsett 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, Yalobusha County, MS, Dyer County, TN, Lake County, TN, Lauderdale County, TN, Obion County, TN, Shelby County, TN, Tipton County, TN
The radar
The Memphis radar (KNQA), 32 km from the middle of the area, began a volume at 20:05 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, 8.1 hours before the alert went out and 319 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.
- Mixed-layer CAPE
- 751 J/kg
- Mixed-layer CIN
- -70 J/kg
- Mixed-layer LCL
- 1224 m above ground
- 0-6 km bulk shear
- 8 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 24, 12:20 PM CDT, 2 hours 47 minutes earlier.
Area forecast discussion, Aug 24, 12:20 PM CDT, 2 hours 47 minutes before
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</html>Hazardous weather outlook, Aug 24, 4:09 AM CDT, 10 hours 58 minutes before
Hazardous Weather Outlook National Weather Service Memphis TN 409 AM CDT Tue Aug 24 2021 ARZ009-018-026>028-035-036-048-049-058-MOZ113-115-MSZ001>017- 020>024-TNZ001>004-019>022-048>055-088>092-251115- 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-Lee AR-Lee MS- Madison-Marshall-McNairy-Mississippi-Monroe-Obion-Panola-Pemiscot- Phillips-Poinsett-Pontotoc-Prentiss-Quitman-Shelby-St. Francis- Tallahatchie-Tate-Tippah-Tipton-Tishomingo-Tunica-Union-Weakley- Yalobusha- 409 AM CDT Tue Aug 24 2021 This hazardous weather outlook is for portions of East Arkansas... the Missouri Bootheel...North Mississippi...and West Tennessee. .DAY ONE...Today and Tonight Hot and humid conditions will prevail today, with heat indices reaching ranging from 105 along the Mississippi River to 113 over the delta in northwest Mississippi and east central Arkansas. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Hot and humid conditions will prevail through Wednesday, before gradually moderating during the latter half of the week. .SPOTTER INFORMATION STATEMENT... Spotter activation is not anticipated at this time.
Nearby
Heat Advisories in Arkansas, 2021Heat Advisories in Mississippi, 2021Heat Advisories in Tennessee, 2021Every heat advisory in 2021
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.