Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 253, NWS Shreveport, LA

July 16, 20095 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Jul 16, 2009, 9:04 PM CDT for 5 parishes in Louisiana. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Jul 16, 2009, 9:04 PM CDT (02:04 UTC)
Expired
Jul 16, 2009, 10:00 PM CDT
In force
56 min
Issued by
NWS Shreveport, LA
Area
Storm-based polygon

Counties Caldwell Parish, LA, Jackson Parish, LA, Lincoln Parish, LA, Ouachita Parish, LA, Union Parish, LA

The radar

The Shreveport radar (KSHV), 138 km from the middle of the area, began a volume at 02:06 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Jul 16, 7:53 PM CDTSevere Thunderstorm WatchSPC4 hr

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 2.1 hours before the alert went out and 129 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, Shreveport, LA at 00:00Z on 2009-07-17Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1155 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, Shreveport, LA at 00:00Z on 2009-07-17The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -21 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
1155 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
2275 m above ground
0-6 km bulk shear
11 kt
0-1 km storm-relative helicity
-21 m²/s²
0-3 km storm-relative helicity
11 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 severe thunderstorm warning 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 severe thunderstorm warning went out at Jul 16, 8:05 PM CDT, 59 minutes earlier.

Area forecast discussion, Jul 16, 8:05 PM CDT, 59 minutes before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
805 PM CDT THU JUL 16 2009

.DISCUSSION...
UPDATE TO INCLUDE SVR WATCH # 591 UNTIL MIDNIGHT FOR ROUGHLY THE
I-20 CORRIDOR OF NORTHERN LOUISIANA AS WELL AS EXTREME EAST
CENTRAL TEXAS. CONVECTION CONTINUES TO INCREASE IN THE WAKE OF
WELL DEFINED OUTFLOW BOUNDARY WHICH EXTENDS FROM NEAR MARSHALL
TEXAS TO NEAR BENTON...RUSTON AND FARMERVILLE LOUISIANA. HAVE
INCREASED POPS TO LIKELY CATEGORY TO COINCIDE WITH THE ADDITIONAL
WATCH. REMOVED HEAT ADVISORY HEADLINES FOR THE REMAINDER OF THE
NIGHT.

NO OTHER CHANGES ATTM...13.

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  75  93  69  91  62 /  70  30  20  20  10
MLU  74  91  69  89  60 /  70  50  30  20  10
DEQ  73  88  62  88  58 /  70  20  20  10  10
TXK  74  90  66  89  59 /  70  20  20  20  10
ELD  74  90  63  89  59 /  70  30  20  20  10
TYR  75  95  70  91  63 /  50  20  20  20  20
GGG  74  94  68  91  62 /  50  20  20  20  20
LFK  74  98  71  94  67 /  30  30  20  30  20

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...NONE.
LA...NONE.
OK...NONE.
TX...NONE.
&&

13
Hazardous weather outlook, Jul 16, 8:45 PM CDT, 19 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
845 PM CDT THU JUL 16 2009

ARZ050-051-059>061-070>073-OKZ077-TXZ096-097-108-109-111-112-171100-
BOWIE-CASS-COLUMBIA-FRANKLIN-HEMPSTEAD-HOWARD-LAFAYETTE-LITTLE RIVER-
MCCURTAIN-MILLER-MORRIS-NEVADA-RED RIVER TX-SEVIER-TITUS-UNION AR-
845 PM CDT THU JUL 16 2009

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

.DAY ONE...TONIGHT...
WIDESPREAD SHOWERS AND THUNDERSTORMS WILL LIKELY PRODUCE STRONG AND
DAMAGING WIND GUSTS THROUGH THE EVENING HOURS ACROSS NORTHEAST
TEXAS...SOUTHEAST OKLAHOMA...SOUTHWEST ARKANSAS AS WELL AS NORTHWEST
AND NORTH CENTRAL LOUISIANA. EXPECT FREQUENT CLOUD TO GROUND
LIGHTNING AS WELL AS BRIEF...LOCALLY HEAVY RAINFALL WITH THE STORMS
THIS EVENING AS WELL. LATER TONIGHT...STORM SEVERITY SHOULD DIMINISH
AS THE ATMOSPHERE BEGINS TO STABILIZE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...
A FEW THUNDERSTORMS MAY LINGER INTO THE FIRST PART OF THE WEEKEND.
HOWEVER...A COLD FRONT WILL BRING SLIGHTLY COOLER AND DRIER
CONDITIONS ACROSS THE REGION.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED OVERNIGHT DUE TO THE EXPECTED
OUTBREAK OF SEVERE WEATHER ACROSS THE FOUR STATE REGION.

LAZ001>006-010>014-017>022-TXZ110-124>126-136>138-149>153-165>167-
171100-
ANGELINA-BIENVILLE-BOSSIER-CADDO-CALDWELL-CAMP-CHEROKEE-CLAIBORNE-
DE SOTO-GRANT-GREGG-HARRISON-JACKSON-LA SALLE-LINCOLN-MARION-
NACOGDOCHES-NATCHITOCHES-OUACHITA-PANOLA-RED RIVER LA-RUSK-SABINE LA-
SABINE TX-SAN AUGUSTINE-SHELBY-SMITH-UNION LA-UPSHUR-WEBSTER-WINN-
WOOD-
845 PM CDT THU JUL 16 2009

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL
LOUISIANA...NORTHWEST LOUISIANA...EAST TEXAS AND NORTHEAST TEXAS.

.DAY ONE...TONIGHT...
WIDESPREAD SHOWERS AND THUNDERSTORMS WILL LIKELY PRODUCE STRONG AND
DAMAGING WIND GUSTS THROUGH THE EVENING HOURS ACROSS NORTHEAST
TEXAS...SOUTHEAST OKLAHOMA...SOUTHWEST ARKANSAS AS WELL AS NORTHWEST
AND NORTH CENTRAL LOUISIANA. EXPECT FREQUENT CLOUD TO GROUND
LIGHTNING AS WELL AS BRIEF...LOCALLY HEAVY RAINFALL WITH THE STORMS
THIS EVENING AS WELL. LATER TONIGHT...STORM SEVERITY SHOULD DIMINISH
AS THE ATMOSPHERE BEGINS TO STABILIZE.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...
A FEW THUNDERSTORMS MAY LINGER INTO THE FIRST PART OF THE WEEKEND.
HOWEVER...A COLD FRONT WILL BRING SLIGHTLY COOLER AND DRIER
CONDITIONS ACROSS THE REGION.

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL BE NEEDED OVERNIGHT DUE TO THE EXPECTED
OUTBREAK OF SEVERE WEATHER ACROSS THE FOUR STATE REGION.

13

In the hours before

Local storm report, Jul 16, 7:55 PM CDT, 1 hour 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
755 PM CDT THU JUL 16 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0754 PM     TSTM WND DMG     HOMER                   32.79N 93.06W
07/16/2009                   CLAIBORNE          LA   LAW ENFORCEMENT

            SEVERAL TREES AND POWER LINES DOWN AROUND THE CITY OF
            HOMER.

&&

18
Local storm report, Jul 16, 8:13 PM CDT, 51 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
813 PM CDT THU JUL 16 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0810 PM     TSTM WND DMG     7 SW HOMER              32.72N 93.14W
07/16/2009                   CLAIBORNE          LA   LAW ENFORCEMENT

            A TREE IS REPORTED DOWN 7 MILES SW OF HOMER ON HIGHWAY
            79.

&&

18
Local storm report, Jul 16, 8:31 PM CDT, 33 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
831 PM CDT THU JUL 16 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0745 PM     TSTM WND DMG     N RODESSA               32.97N 93.99W
07/16/2009                   CADDO              LA   LAW ENFORCEMENT

            TREES DOWN.

&&

18
Local storm report, Jul 16, 8:35 PM CDT, 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
835 PM CDT THU JUL 16 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0815 PM     TSTM WND DMG     BENTON                  32.69N 93.74W
07/16/2009                   BOSSIER            LA   AMATEUR RADIO

            SEVERAL LOCATIONS AROUND THE CITY OF BENTON ARE WITHOUT
            POWER.

0830 PM     TSTM WND DMG     BLANCHARD               32.59N 93.89W
07/16/2009                   CADDO              LA   AMATEUR RADIO

            POWER IS OUT ACROSS PORTIONS OF THE CITY OF BLANCHARD.

&&

18
Local storm report, Jul 16, 8:49 PM CDT, 15 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
849 PM CDT THU JUL 16 2009

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0730 PM     TSTM WND DMG     PLAIN DEALING           32.91N 93.70W
07/16/2009                   BOSSIER            LA   LAW ENFORCEMENT

            SHERIFFS OFFICE REPORTS TREE DOWN ON SCOTT DRIVE IN PLAIN
            DEALING.

0805 PM     TSTM WND DMG     18 NE BOSSIER CITY      32.70N 93.44W
07/16/2009                   BOSSIER            LA   LAW ENFORCEMENT

            SHERIFFS OFFICE REPORTS POWER LINES DOWN ON HWY 157 NEAR
            BELLEVUE.

0820 PM     TSTM WND DMG     HAUGHTON                32.53N 93.51W
07/16/2009                   BOSSIER            LA   LAW ENFORCEMENT

            SHERIFFS OFFICE REPORTS A TREE DOWN ON DOGWOOD DRIVE.

&&

18
Local storm report, Jul 16, 8:58 PM CDT, 6 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 16, 7:41 PM CDTSevere Thunderstorm WarningSHVCass49 min
Jul 16, 8:14 PM CDTSevere Thunderstorm WarningSHVHarrison, Marion, Panola46 min
Jul 16, 8:50 PM CDTFlash Flood WarningSHVHarrison, Marion3 hr
Jul 16, 9:00 PM CDTSevere Thunderstorm WarningSHVHarrison, Marion, Panola60 min
Jul 17, 5:42 AM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Rusk, Smith, Upshur38 min
Jul 17, 6:00 AM CDTSevere Thunderstorm WarningSHVGregg, Harrison, Marion, Panola, Rusk45 min
Jul 17, 6:38 AM CDTAreal Flood AdvisorySHVGregg, Harrison, Rusk, Upshur3 hr
Jul 16, 7:19 PM CDTSevere Thunderstorm WarningSHVClaiborne, Union41 min
Jul 16, 7:56 PM CDTSevere Thunderstorm WarningSHVBienville, Claiborne, Jackson, Lincoln, Ouachita, Union and 1 more64 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2009Every severe thunderstorm warning in 2009

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.