Alert archive / Louisiana / Heat Advisories in 2016

Heat Advisory 9, NWS Shreveport, LA

August 12, 2016Angelina County, Sabine County, San Augustine County, Texas; 5 parishes in Louisiana; 5 counties in Arkansas

NWS Shreveport, LA issued this heat advisory at Aug 12, 2016, 3:22 AM CDT for Angelina County, Sabine County, San Augustine County, Texas; 5 parishes in Louisiana; 5 counties in Arkansas. It was in force for 16 hr.

The area

The counties it named.

The facts

Issued
Aug 12, 2016, 3:22 AM CDT (08:22 UTC)
Expired
Aug 12, 2016, 7:00 PM CDT
In force
16 hr
Issued by
NWS Shreveport, LA

Counties Columbia County, AR, Hempstead County, AR, Lafayette County, AR, Nevada County, AR, Union County, AR, Bienville Parish, LA, Claiborne Parish, LA, Red River Parish, LA, Sabine Parish, LA, Webster Parish, LA, Angelina County, TX, Sabine County, TX, San Augustine County, TX

The radar

The Shreveport radar (KSHV), 34 km from the middle of the area, began a volume at 08:26 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

Lake Charles Mun, LA (KLCH), launched 00:00Z, 8.4 hours before the alert went out and 267 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, Lake Charles Mun, LA at 00:00Z on 2016-08-12Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3805 joules per kilogram.LCLEL10008507005003002001001 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, Lake Charles Mun, LA at 00:00Z on 2016-08-12The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 71 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
3805 J/kg
Mixed-layer CIN
0 J/kg
Mixed-layer LCL
742 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
71 m²/s²
0-3 km storm-relative helicity
78 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 Shreveport, LA wrote its last area forecast discussion before this heat advisory went out at Aug 12, 2:57 AM CDT, 25 minutes earlier.

Area forecast discussion, Aug 12, 2:57 AM CDT, 25 minutes before
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Hazardous weather outlook, Aug 11, 11:44 AM CDT, 15 hours 38 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1144 AM CDT THU AUG 11 2016

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-121645-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-DE SOTO-
RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE-NATCHITOCHES-WINN-
GRANT-CALDWELL-LA SALLE-MCCURTAIN-BOWIE-FRANKLIN-TITUS-CAMP-
MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-
PANOLA-NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-
1144 AM CDT THU AUG 11 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL
ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA...
NORTHWEST LOUISIANA...SOUTHEAST OKLAHOMA...EAST TEXAS AND
NORTHEAST TEXAS.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

THE COMBINATION OF HOT TEMPERATURES AND ELEVATED RELATIVE HUMIDITY
VALUES WILL RESULT IN HEAT INDEX VALUES FROM 105-110 DEGREES FOR
MUCH OF EAST AND NORTHEAST TEXAS...SOUTHEAST OKLAHOMA...SOUTH
ARKANSAS...AND PARTS OF NORTHWEST LOUISIANA. SHOWERS AND
THUNDERSTORMS CAN BE EXPECTED THROUGH THE AFTERNOON...AND ANY
STRONG STORMS WILL HAVE THE CAPABILITY OF PRODUCING STRONG WIND
GUSTS...FREQUENT CLOUD TO GROUND LIGHTNING AND BRIEF HEAVY
DOWNPOURS.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

COOLER TEMPERATURES EXPECTED ON FRIDAY FOR MUCH OF THE REGION
WITH SHOWERS AND THUNDERSTORMS BECOMING MORE NUMEROUS AND
WIDESPREAD INTO THE WEEKEND AND LINGERING THROUGH MUCH OF NEXT
WEEK. THIS DUE TO THE COMBINATION OF A COLD FRONT APPROACHING FROM
THE NORTH AND BECOMING NEARLY STATIONARY WITH ABUNDANT GULF
MOISTURE FEEDING INTO THE AREA. RAINFALL WILL BE HEAVY AT TIMES
AND THE AREA WILL SEE AMOUNTS OF ONE TO THREE INCHES WITH HIGHER
AMOUNTS OF FOUR TO OVER SEVEN INCHES POSSIBLE ACROSS NORTH
LOUISIANA AND SOUTH ARKANSAS.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS...AND STORM SPOTTERS WILL NOT BE NEEDED TODAY OR
TONIGHT.

05

The office that day

Everything else NWS Shreveport, LA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 12, 1:36 PM CDTFlash Flood WatchSHVAngelina, Nacogdoches, Sabine, San Augustine49 hr
Aug 12, 5:06 PM CDTSpecial Weather StatementSHVWood39 min
Aug 12, 4:35 PM CDTSpecial Weather StatementSHVBienville40 min
Aug 12, 4:42 PM CDTSevere Thunderstorm WarningSHVBienville, Bossier, Webster48 min
Aug 12, 5:11 PM CDTSpecial Weather StatementSHVUnion34 min

Nearby

Heat Advisories in Louisiana, 2016Heat Advisories in Arkansas, 2016Heat Advisories in Texas, 2016Every heat advisory in 2016

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.