Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 66, NWS Shreveport, LA

April 2, 2009Ouachita Parish, Louisiana

NWS Shreveport, LA issued this severe thunderstorm warning at Apr 2, 2009, 9:50 AM CDT for Ouachita Parish, Louisiana. It was in force for 30 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: Apr 2, 2009, 9:50 AM CDT (14:50 UTC)
Expired: Apr 2, 2009, 10:20 AM CDT
In force: 30 min
Issued by: NWS Shreveport, LA
Area: Storm-based polygon

County Ouachita Parish, LA

The radar

The Shreveport radar (KSHV), 158 km from the middle of the area, began a volume at 14:54 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.

Issued	Product	Office	Lasted
Apr 2, 4:43 AM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Jackson, MS (KJAN), launched 12:00Z, 2.8 hours before the alert went out and 196 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: 1573 J/kg
Mixed-layer CIN: -104 J/kg
Mixed-layer LCL: 460 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 164 m²/s²
0-3 km storm-relative helicity: 211 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.7

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 Apr 2, 8:12 AM CDT, 1 hour 38 minutes earlier.

Area forecast discussion, Apr 2, 8:12 AM CDT, 1 hour 38 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SHREVEPORT LA
812 AM CDT THU APR 2 2009

.DISCUSSION...

HAVE UPDATED THE ZONES TO REMOVE SEVERE THUNDERSTORM WATCH NUMBER
102 FOR PARTS OF EAST TEXAS.

&&

.PRELIMINARY POINT TEMPS/POPS...
SHV  71  42  71  51  75 / 100   0   0   0  10
MLU  73  43  69  48  77 / 100  20   0   0  10
DEQ  66  35  69  46  76 /  70  20   0   0  10
TXK  68  39  70  49  76 / 100  20   0   0  10
ELD  71  41  71  46  77 / 100  20   0   0  10
TYR  70  42  73  53  77 / 100   0   0   0  10
GGG  71  41  72  51  75 / 100   0   0   0  10
LFK  74  42  75  51  79 / 100   0   0   0  10

&&

.SHV WATCHES/WARNINGS/ADVISORIES...
AR...LAKE WIND ADVISORY UNTIL 11 PM CDT THIS EVENING FOR THE
     FOLLOWING ZONES: ARZ050-051-059>061-070>073.

LA...LAKE WIND ADVISORY UNTIL 11 PM CDT THIS EVENING FOR THE
     FOLLOWING ZONES: LAZ001>006-010>014-017>022.

OK...LAKE WIND ADVISORY UNTIL 11 PM CDT THIS EVENING FOR THE
     FOLLOWING ZONES: OKZ077.

TX...LAKE WIND ADVISORY UNTIL 11 PM CDT THIS EVENING FOR THE
     FOLLOWING ZONES:
     TXZ096-097-108>112-124>126-136>138-149>153-165>167.

&&

06

Hazardous weather outlook, Apr 2, 7:01 AM CDT, 2 hours 49 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
701 AM CDT THU APR 2 2009

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-TXZ096-
097-108>112-124>126-136>138-149>153-165>167-021700-
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-
701 AM CDT THU APR 2 2009

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

.DAY ONE...TODAY AND TONIGHT...

SHOWERS AND THUNDERSTORMS WILL BE SPREADING EAST OVER THE LOWER
HALF OF NORTHEAST TEXAS...NORTHWEST AND NORTH CENTRAL
LOUISIANA AND SOUTHWEST ARKANSAS THIS MORNING FOLLOWED BY
RAIN AND EMBEDDED SHOWERS. SOME OF THE THUNDERSTORMS MAY BECOME
SEVERE AND PRODUCE ISOLATED LARGE HAIL AND STRONG AND GUSTY WINDS.
LOCALLY HEAVY RAIN MAY ALSO OCCUR. BY MID DAY THE RAIN WILL BE
TAPERING OFF FROM WEST TO EAST AS DRIER AIR ON THE SURFACE AND
ALOFT SPREAD EAST INTO THE FOUR STATE REGION. THE THREAT FOR
SEVERE WEATHER SHIFTS TO THE FAR EAST AHEAD OF THE SURFACE
COLD FRONT OVER PARTS OF SOUTH CENTRAL ARKANSAS AND NORTH CENTRAL
LOUISIANA. A LAKE WIND ADVISORY WILL BE IN EFFECT FROM 10 AM
CDT THIS MORNING UNTIL 11 PM CDT TONIGHT WITH WINDS OF 15 TO 25 MPH
WITH HIGHER GUSTS TO 30 TO 35 MPH...WITH SOME WINDS
INCREASING TO 20 TO 23 MPH WITH GUSTS TO NEAR 35 TO 40
MPH.

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

ANOTHER COLD FRONT WILL MOVE INTO THE AREA DURING THE
WEEKEND RETURNING RAIN CHANCES...WITH ANOTHER ROUND OF RAIN
RETURNING NEAR MID WEEK. NO HAZARDOUS WEATHER IS EXPECTED AT THIS
TIME.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF STORM SPOTTER GROUPS...HAM RADIO OPERATORS...AND
EMERGENCY MANAGEMENT PERSONNEL...WILL BE NEEDED ACROSS PARTS OF
EAST TEXAS...SOUTHWEST ARKANSAS...AND NORTHWEST AND NORTH CENTRAL
LOUISIANA THROUGH THE AFTERNOON.

06

In the hours before

Special weather statement, Apr 2, 8:25 AM CDT, 1 hour 25 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
825 AM CDT THU APR 2 2009

LAZ011-017-018-021430-
NATCHITOCHES-RED RIVER-SABINE-
825 AM CDT THU APR 2 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 930 AM CDT...FOR THE FOLLOWING
PARISHES...

IN NORTHWEST LOUISIANA...
     RED RIVER...NATCHITOCHES AND SABINE...

INCLUDING THE FOLLOWING LOCATIONS...
     CAMPTI...COUSHATTA AND NATCHITOCHES...

AT 820 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
LINE OF STRONG THUNDERSTORMS 9 MILES FROM SOUTHERN RED RIVER PARISH
TO NEAR FLORIEN IN SABINE PARISH...MOVING NORTHEAST AT 70 MPH.

SMALL HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.

03

Special weather statement, Apr 2, 8:29 AM CDT, 1 hour 21 minutes before

SPECIAL WEATHER STATEMENT...CORRECTED
NATIONAL WEATHER SERVICE SHREVEPORT LA
829 AM CDT THU APR 2 2009

LAZ011-017-018-021430-
NATCHITOCHES-RED RIVER-SABINE-
829 AM CDT THU APR 2 2009

...SIGNIFICANT WEATHER ALERT...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ALERT...EFFECTIVE UNTIL 930 AM CDT...FOR THE FOLLOWING
PARISHES...

IN NORTHWEST LOUISIANA...
     RED RIVER...NATCHITOCHES AND SABINE...

INCLUDING THE FOLLOWING LOCATIONS...
     CAMPTI...COUSHATTA AND NATCHITOCHES...

AT 820 AM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
LINE OF STRONG THUNDERSTORMS 9 MILES FROM SOUTHERN RED RIVER PARISH
TO NEAR FLORIEN IN SABINE PARISH...MOVING NORTHEAST AT 40 MPH.

SMALL HAIL...AND WINDS 30 TO 40 MPH ARE EXPECTED WITH THIS STORM.

03

Local storm report, Apr 2, 8:48 AM CDT, 1 hour 2 minutes before

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Special weather statement, Apr 2, 9:18 AM CDT, 32 minutes before

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Special weather statement, Apr 2, 9:21 AM CDT, 29 minutes before

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Local storm report, Apr 2, 9:40 AM CDT, 10 minutes 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
Apr 2, 5:19 AM CDT	Severe Thunderstorm Warning	SHV	Bowie, Camp, Cass, Franklin, Morris, Red River and 2 more	26 min
Apr 2, 8:36 AM CDT	Severe Thunderstorm Warning	SHV	Natchitoches	39 min
Apr 2, 9:27 AM CDT	Severe Thunderstorm Warning	SHV	Caldwell, Grant, LaSalle, Winn	51 min

Nearby

Severe Thunderstorm Warnings in Louisiana, 2009 Every 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.