Alert archive / Louisiana / Severe Thunderstorm Warnings in 2008

Severe Thunderstorm Warning 50, NWS Shreveport, LA

February 16, 20085 parishes in Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Feb 16, 2008, 10:32 PM CST for 5 parishes in Louisiana. It was in force for 58 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: Feb 16, 2008, 10:32 PM CST (04:32 UTC)
Expired: Feb 16, 2008, 11:30 PM CST
In force: 58 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

Counties Bienville Parish, LA, Grant Parish, LA, Natchitoches Parish, LA, Red River Parish, LA, Winn Parish, LA

The nearest sounding before it

Shreveport, LA (KSHV), launched 00:00Z, 4.5 hours before the alert went out and 97 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 237 J/kg
Mixed-layer CIN: -261 J/kg
Mixed-layer LCL: 667 m above ground
0-6 km bulk shear: 50 kt
0-1 km storm-relative helicity: 408 m²/s²
0-3 km storm-relative helicity: 591 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.2

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 Feb 16, 9:27 PM CST, 1 hour 5 minutes earlier.

Area forecast discussion, Feb 16, 9:27 PM CST, 1 hour 5 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
927 PM CST SAT FEB 16 2008

.DISCUSSION...

HAVE UPDATED THE TEXT ZONES TO TAKE OUT THE TOR WATCH. OTHER
CHANGES INCLUDE UPDATING WINDS...AS INITIAL SHIFT IS NOW
INTO NORTHWEST LOUISIANA. TEMPS AND DEWPOINTS HAVE BEEN ADJUSTED
IN GRIDS TO CURRENT CONDITIONS...WHICH REQUIRED ADJUSTING THE
OVERNIGHT LOWS. POPS WERE ALSO ADJUSTED...BUT STILL REMAIN
CONDITIONAL IN MOST ZONES FOR NOW. MAY NEED ANOTHER UPDATE AS THE
SYSTEM ACCELERATES TO THE NORTHEAST. MAIN SURFACE LOW CURRENTLY IN
SOUTHWEST AR. ON STLT LOOPS UPPER LOW CROSSING RED RIVER INTO
SOUTHWEST OKLAHOMA.

.AVIATION...

LINE OF STRONG TSTMS JUST ALONG PREFRONTAL WIND SHIFT.
ALTHOUGH STRONG ROTATION IN LOW LEVELS...STORMS HAVE NOT BEEN ABLE
THUS FAR TO ACHIEVE SFC BASED INSTABILITY...AS SEEN BY BOTH LACK OF
REPORTS...AND WEAK LAPSE RATES IN MOIST AIR BELOW 700 MB ON 0Z
SHV RAOB. S-SE WINDS AHEAD OF STORMS WILL MAINTAIN 15-25 MPH WITH
INCREASING LOW LVL JET. POSTFRONTAL ELEVATED INSTABILITY ON 0Z FWD
RAOB SUPPORTS SMALL HAIL IN CONVECTION. S-SE WINDS AHEAD OF STORMS
WILL MAINTAIN 15-25 MPH WITH INCREASING LOW LVL JET. LOW VFR/MVFR
CLOUDS IN WARM SECTOR...WHILE WARM FRONTAL BOUNDARY IN SW AR BRINGING
TEMPO IFR CIGS TO TXK/ELD SITES. WILL SEE SKC/SCT LATTER PORTIONS OF
TAF PERIOD AS KICKER PUSHES COLD FRONT THRU AREA BY MORNING./VII/

.PRELIMINARY POINT TEMPS/POPS...
SHV 45 62 37 56 / 90 10 10 0
MLU 49 65 37 56 / 100 10 10 0
DEQ 38 52 30 53 / 100 20 10 0
TXK 40 56 36 55 / 100 10 10 0
ELD 45 62 34 54 / 80 20 10 0
TYR 38 57 38 57 / 100 10 10 0
GGG 42 58 35 55 / 100 10 10 0
LFK 45 67 38 61 / 90 10 10 0

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...LAKE WIND ADVISORY UNTIL 4 AM SUNDAY FOR THE FOLLOWING ZONES:
COLUMBIA...HEMPSTEAD...HOWARD...LAFAYETTE...LITTLE
RIVER...MILLER...NEVADA...SEVIER...AND UNION AR.

LA...LAKE WIND ADVISORY UNTIL 4 AM SUNDAY FOR THE FOLLOWING ZONES:
BIENVILLE...BOSSIER...CADDO...CALDWELL...CLAIBORNE...DE
SOTO...GRANT...JACKSON...LA
SALLE...LINCOLN...NATCHITOCHES...OUACHITA...RED
RIVER...SABINE LA...UNION LA...WEBSTER...AND WINN.

OK...LAKE WIND ADVISORY UNTIL 4 AM SUNDAY FOR THE FOLLOWING ZONES:
AND MCCURTAIN.

TX...LAKE WIND ADVISORY UNTIL 4 AM SUNDAY FOR THE FOLLOWING ZONES:
ANGELINA...BOWIE...CAMP...CASS...CHEROKEE...FRANKLIN...GREGG...HARRISON...MARION...MORRIS...NACOGDOCHES...PANOLA...RED
RIVER...RUSK...SABINE TX...SAN
AUGUSTINE...SHELBY...SMITH...TITUS...UPSHUR...AND WOOD.

14/07

Hazardous weather outlook, Feb 16, 10:34 AM CST, 11 hours 58 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1034 AM CST SAT FEB 16 2008

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-171200-
ANGELINA-BIENVILLE-BOSSIER-BOWIE-CADDO-CALDWELL-CAMP-CASS-CHEROKEE-
CLAIBORNE-COLUMBIA-DE SOTO-FRANKLIN-GRANT-GREGG-HARRISON-HEMPSTEAD-
HOWARD-JACKSON-LA SALLE-LAFAYETTE-LINCOLN-LITTLE RIVER-MARION-
MCCURTAIN-MILLER-MORRIS-NACOGDOCHES-NATCHITOCHES-NEVADA-OUACHITA-
PANOLA-RED RIVER LA-RED RIVER TX-RUSK-SABINE LA-SABINE TX-
SAN AUGUSTINE-SEVIER-SHELBY-SMITH-TITUS-UNION AR-UNION LA-UPSHUR-
WEBSTER-WINN-WOOD-
1034 AM CST SAT FEB 16 2008

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

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

THERE IS A MODERATE RISK OF SEVERE THUNDERSTORMS THIS AFTERNOON AND
EVENING WEST OF A LINE FROM BROKEN BOW OKLAHOMA...TO MINDEN AND
NATCHITOCHES LOUISIANA.  A SLIGHT RISK OF SEVERE THUNDERSTORMS COVERS
THE REMAINDER OF THE FOUR STATE REGION.

THE MAIN SEVERE WEATHER RISKS WILL BE HAIL LARGER THAN PENNIES AND
DAMAGING WINDS GREATER THAN 60 MILES AN HOUR.  ISOLATED TORNADOES
WILL ALSO BE POSSIBLE...ESPECIALLY THIS AFTERNOON AND EVENING.  THIS
RISK IS GREATEST ACROSS TEXAS...WEST OF A MINEOLA...TO LONGVIEW...
TO LUFKIN LINE.

IN ADDITION...LOCALLY HEAVY RAINFALL OF 2 TO 4 INCHES WILL BE
POSSIBLE ACROSS THE ENTIRE FOUR STATE REGION BEFORE ENDING.  THESE
RAINFALL AMOUNTS MAY RESULT IN THE PONDING OF WATER ALONG AREA
ROADWAYS AND OTHER LOW LYING AREAS.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.SPOTTER INFORMATION STATEMENT...

SKYWARN SPOTTER...HAM RADIO OPERATOR...AND EMERGENCY MANAGEMENT
PERSONNEL ACTIVATION WILL LIKELY BE NEEDED BY THIS AFTERNOON ACROSS
PARTS OF EAST TEXAS.  ACTIVATION WILL LIKELY BE NEEDED ACROSS THE
REMAINDER OF THE AREA TONIGHT.

BUTTS

In the hours before

Local storm report, Feb 16, 9:57 PM CST, 35 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SHREVEPORT LA
957 PM CST SAT FEB 16 2008

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

0810 PM     TSTM WND DMG     2 NW CENTER             31.81N 94.20W
02/16/2008                   SHELBY             TX   LAW ENFORCEMENT

            SHERIFFS OFFICE REPORTS TREE DOWN, DAMAGING POWERLINES
            ALONG HWY 87N.

0820 PM     TSTM WND DMG     5 SE CENTER             31.74N 94.12W
02/16/2008                   SHELBY             TX   LAW ENFORCEMENT

            SHERIFFS OFFICE REPORTS TREE DOWN ALONG CR 417, NEAR HWY
            87S IN SHELBYVILLE.

&&

18

Local storm report, Feb 16, 10:31 PM CST, 1 minute before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Feb 16, 7:58 PM CST	Severe Thunderstorm Warning	SHV	Panola, Shelby	47 min
Feb 17, 8:14 AM CST	River Flood Warning	SHV	Smith, Wood	24 hr
Feb 17, 9:12 AM CST	River Flood Warning	SHV	Angelina, Cherokee, Nacogdoches	3 days
Feb 17, 9:22 AM CST	River Flood Warning	SHV	Nacogdoches, Panola, Rusk, San Augustine, Shelby	5 days
Feb 17, 9:55 AM CST	River Flood Warning	SHV	Franklin, Morris, Red River, Titus	3 days
Feb 17, 9:55 AM CST	River Flood Warning	SHV	Bowie, Cass, Morris	8 days
Feb 17, 9:55 AM CST	River Flood Warning	SHV	Franklin, Morris, Titus	68 hr
Feb 17, 1:00 PM CST	River Flood Warning	SHV	Sabine, San Augustine	20 hr
Feb 16, 8:17 PM CST	Severe Thunderstorm Warning	SHV	Caddo, De Soto	58 min
Feb 16, 9:02 PM CST	Severe Thunderstorm Warning	SHV	De Soto, Red River	43 min
Feb 16, 9:13 PM CST	Severe Thunderstorm Warning	SHV	Bossier, Claiborne, Webster	62 min
Feb 16, 9:28 PM CST	Severe Thunderstorm Warning	SHV	Bienville, Bossier, Red River, Webster	62 min
Feb 16, 10:13 PM CST	Severe Thunderstorm Warning	SHV	De Soto, Natchitoches, Red River, Sabine	62 min
Feb 16, 10:52 PM CST	Severe Thunderstorm Warning	SHV	Bienville, Lincoln	53 min
Feb 16, 11:19 PM CST	Severe Thunderstorm Warning	SHV	Grant, Jackson, Natchitoches, Winn	56 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2008 Every severe thunderstorm warning in 2008

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.