Alert archive / Mississippi / Heat Advisories in 2021

Heat Advisory 13, NWS Jackson, MS

September 1, 202124 counties in Mississippi; Ashley County, Chicot County, Arkansas; 9 parishes in Louisiana

NWS Jackson, MS issued this heat advisory at Sep 1, 2021, 4:08 AM CDT for 24 counties in Mississippi; Ashley County, Chicot County, Arkansas; 9 parishes in Louisiana. It took effect at Sep 1, 2021, 10:00 AM CDT. It was in force for 9 hr.

The area

The counties it named.

The facts

Issued
Sep 1, 2021, 4:08 AM CDT (09:08 UTC)
In effect from
Sep 1, 2021, 10:00 AM CDT
Expired
Sep 1, 2021, 7:00 PM CDT
In force
9 hr
Issued by
NWS Jackson, MS
All 35 counties

Ashley County, AR, Chicot County, AR, Catahoula Parish, LA, Concordia Parish, LA, East Carroll Parish, LA, Franklin Parish, LA, Madison Parish, LA, Morehouse Parish, LA, Richland Parish, LA, Tensas Parish, LA, West Carroll Parish, LA, Adams County, MS, Bolivar County, MS, Carroll County, MS, Claiborne County, MS, Copiah County, MS, Franklin County, MS, Hinds County, MS, Holmes County, MS, Humphreys County, MS, Issaquena County, MS, Jefferson County, MS, Jefferson Davis County, MS, Lawrence County, MS, Leflore County, MS, Lincoln County, MS, Madison County, MS, Marion County, MS, Rankin County, MS, Sharkey County, MS, Simpson County, MS, Sunflower County, MS, Warren County, MS, Washington County, MS, Yazoo County, MS

The radar

The Jackson/Brandon,MS radar (KDGX), 80 km from the middle of the area, began a volume at 09:12 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 00:00Z, 9.1 hours before the alert went out and 70 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, Jackson, MS at 00:00Z on 2021-09-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 506 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Jackson, MS at 00:00Z on 2021-09-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 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
506 J/kg
Mixed-layer CIN
-4 J/kg
Mixed-layer LCL
1264 m above ground
0-6 km bulk shear
20 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
60 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

752 
WWUS74 KJAN 010908
NPWJAN

URGENT - WEATHER MESSAGE
National Weather Service Jackson MS
408 AM CDT Wed Sep 1 2021

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025-027-034>036-
040>043-047>049-053>055-059>064-072-011715-
/O.NEW.KJAN.HT.Y.0013.210901T1500Z-210902T0000Z/
Ashley-Chicot-Morehouse-West Carroll-East Carroll-Richland-
Madison LA-Franklin LA-Catahoula-Tensas-Concordia-Bolivar-
Sunflower-Leflore-Carroll-Washington-Humphreys-Holmes-Issaquena-
Sharkey-Yazoo-Madison MS-Warren-Hinds-Rankin-Claiborne-Copiah-
Simpson-Jefferson-Adams-Franklin MS-Lincoln-Lawrence-
Jefferson Davis-Marion-
Including the cities of Crossett, North Crossett, Hamburg, 
West Crossett, Dermott, Lake Village, Eudora, Bastrop, Oak Grove,
Epps, Lake Providence, Rayville, Delhi, Tallulah, Winnsboro, 
Jonesville, Harrisonburg, Newellton, St. Joseph, Waterproof, 
Vidalia, Ferriday, West Ferriday, Cleveland, Indianola, 
Ruleville, Greenwood, Vaiden, North Carrollton, Carrollton, 
Greenville, Belzoni, Isola, Durant, Tchula, Lexington, Pickens, 
Goodman, Mayersville, Rolling Fork, Anguilla, Yazoo City, 
Ridgeland, Madison, Canton, Vicksburg, Jackson, Pearl, Brandon, 
Richland, Port Gibson, Crystal Springs, Hazlehurst, Wesson, 
Magee, Mendenhall, Fayette, Natchez, Bude, Roxie, Meadville, 
Brookhaven, Monticello, New Hebron, Prentiss, Bassfield, 
and Columbia
408 AM CDT Wed Sep 1 2021

...HEAT ADVISORY IN EFFECT FROM 10 AM THIS MORNING TO 7 PM CDT
THIS EVENING...

* WHAT...Heat index values of 105 to 110 degrees expected.

* WHERE...Portions of northeast Louisiana, southeast Arkansas and
  central Mississippi generally along and west of the Interstate
  55 corridor. 

* WHEN...From 10 AM to 7 PM CDT.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

28
1 follow-up statement
132 
WWUS74 KJAN 011935
NPWJAN

URGENT - WEATHER MESSAGE
National Weather Service Jackson MS
235 PM CDT Wed Sep 1 2021

ARZ074-075-LAZ007>009-015-016-023>026-MSZ018-019-025-027-034>036-
040>043-047>049-053>055-059>064-072-020000-
/O.CON.KJAN.HT.Y.0013.000000T0000Z-210902T0000Z/
Ashley-Chicot-Morehouse-West Carroll-East Carroll-Richland-
Madison LA-Franklin LA-Catahoula-Tensas-Concordia-Bolivar-
Sunflower-Leflore-Carroll-Washington-Humphreys-Holmes-Issaquena-
Sharkey-Yazoo-Madison MS-Warren-Hinds-Rankin-Claiborne-Copiah-
Simpson-Jefferson-Adams-Franklin MS-Lincoln-Lawrence-
Jefferson Davis-Marion-
Including the cities of Crossett, North Crossett, Hamburg, 
West Crossett, Dermott, Lake Village, Eudora, Bastrop, Oak Grove,
Epps, Lake Providence, Rayville, Delhi, Tallulah, Winnsboro, 
Jonesville, Harrisonburg, Newellton, St. Joseph, Waterproof, 
Vidalia, Ferriday, West Ferriday, Cleveland, Indianola, 
Ruleville, Greenwood, Vaiden, North Carrollton, Carrollton, 
Greenville, Belzoni, Isola, Durant, Tchula, Lexington, Pickens, 
Goodman, Mayersville, Rolling Fork, Anguilla, Yazoo City, 
Ridgeland, Madison, Canton, Vicksburg, Jackson, Pearl, Brandon, 
Richland, Port Gibson, Crystal Springs, Hazlehurst, Wesson, 
Magee, Mendenhall, Fayette, Natchez, Bude, Roxie, Meadville, 
Brookhaven, Monticello, New Hebron, Prentiss, Bassfield, 
and Columbia
235 PM CDT Wed Sep 1 2021

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING...

* WHAT...Heat index values of 105 to 110 degrees expected.

* WHERE...Portions of northeast Louisiana, southeast Arkansas 
  and central Mississippi generally along and west of the 
  Interstate 55 corridor.

* WHEN...From 10 AM to 7 PM CDT.

* IMPACTS...Hot temperatures and high humidity may cause heat
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

Take extra precautions if you work or spend time outside. When
possible reschedule strenuous activities to early morning or
evening. Know the signs and symptoms of heat exhaustion and heat
stroke. Wear lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

DL

The office that day

Everything else NWS Jackson, MS issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 1, 1:03 PM CDTSpecial Weather StatementJANLowndes42 min
Sep 1, 1:10 PM CDTSevere Thunderstorm WarningJANLowndes38 min
Sep 1, 2:37 PM CDTSpecial Weather StatementJANNoxubee23 min
Sep 1, 2:46 PM CDTSpecial Weather StatementJANClay29 min
Sep 1, 3:13 PM CDTSpecial Weather StatementJANChoctaw32 min
Sep 1, 3:25 PM CDTSevere Thunderstorm WarningJANClay, Lowndes, Noxubee, Oktibbeha50 min
Sep 1, 3:30 PM CDTSevere Thunderstorm WarningJANAttala, Choctaw, Winston45 min
Sep 1, 3:34 PM CDTSpecial Weather StatementJANCarroll41 min
Sep 1, 4:02 PM CDTSpecial Weather StatementJANCarroll, Holmes43 min
Sep 1, 4:20 PM CDTSevere Thunderstorm WarningJANKemper, Noxubee40 min
Sep 1, 4:35 PM CDTSevere Thunderstorm WarningJANAttala, Carroll, Holmes, Leake, Madison, Yazoo40 min
Sep 1, 4:42 PM CDTSevere Thunderstorm WarningJANAttala, Kemper, Lauderdale, Leake, Neshoba, Newton and 1 more48 min
Sep 1, 5:00 PM CDTSevere Thunderstorm WarningJANKemper45 min
Sep 1, 5:04 PM CDTSevere Thunderstorm WarningJANHolmes, Humphreys, Yazoo41 min
Sep 1, 5:07 PM CDTSevere Thunderstorm WarningJANLeake, Madison, Rankin, Scott, Yazoo68 min
Sep 1, 5:19 PM CDTSevere Thunderstorm WarningJANClarke, Jasper, Lauderdale, Newton56 min
Sep 1, 5:34 PM CDTSevere Thunderstorm WarningJANKemper, Lauderdale, Leake, Neshoba, Newton34 min
Sep 1, 5:45 PM CDTSevere Thunderstorm WarningJANMadison, Yazoo60 min
Sep 1, 6:05 PM CDTSpecial Weather StatementJANClarke, Jasper, Rankin, Scott, Simpson, Smith55 min
Sep 1, 6:14 PM CDTSevere Thunderstorm WarningJANHinds, Madison, Rankin, Simpson76 min
Sep 1, 6:15 PM CDTSevere Thunderstorm WarningJANClarke, Jasper, Lauderdale, Newton60 min
Sep 1, 6:37 PM CDTSevere Thunderstorm WarningJANClarke, Jasper, Simpson, Smith53 min
Sep 1, 5:01 PM CDTSpecial Weather StatementJANAshley44 min

Nearby

Heat Advisories in Mississippi, 2021Heat Advisories in Louisiana, 2021Heat Advisories in Arkansas, 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.