Alert archive / Louisiana / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 189, NWS Shreveport, LA
NWS Shreveport, LA issued this severe thunderstorm warning at May 16, 2009, 3:15 PM CDT for Grant Parish, LaSalle Parish, Louisiana. It was in force for 25 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
- May 16, 2009, 3:15 PM CDT (20:15 UTC)
- Expired
- May 16, 2009, 3:40 PM CDT
- In force
- 25 min
- Issued by
- NWS Shreveport, LA
- Area
- Storm-based polygon
Counties Grant Parish, LA, LaSalle Parish, LA
The nearest sounding before it
Jackson, MS (KJAN), launched 12:00Z, 8.3 hours before the alert went out and 228 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.
- Mixed-layer CAPE
- 2152 J/kg
- Mixed-layer CIN
- -8 J/kg
- Mixed-layer LCL
- 518 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- -40 m²/s²
- 0-3 km storm-relative helicity
- -39 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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 May 16, 11:13 AM CDT, 4 hours 2 minutes earlier.
Area forecast discussion, May 16, 11:13 AM CDT, 4 hours 2 minutes before
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HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1217 PM CDT SAT MAY 16 2009 ARZ050-051-059>061-070-071-OKZ077-TXZ096-097-108>112-171730- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- MCCURTAIN-RED RIVER-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS- 1217 PM CDT SAT MAY 16 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHWEST ARKANSAS...SOUTHEAST OKLAHOMA AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... SHOWERS AND THUNDERSTORMS ARE EXPECTED TODAY AHEAD OF AN APPROACHING COLD FRONT...WHICH IS EXPECTED TO MOVE ACROSS THE INTERSTATE 30 CORRIDOR THIS EVENING. WHILE A FEW THUNDERSTORMS MAY BECOME STRONG DURING THE LATE AFTERNOON AND EVENING...THE GREATEST THREAT WILL BE FROM FLASH FLOODING. THE GROUND IN MOST LOCATION IS COMPLETELY SATURATED...AND MOST RIVERS AND STREAMS ARE NEAR OR ABOVE FLOOD STAGE. AS A RESULT...LOCALLY HEAVY RAIN MAY CAUSE ADDITIONAL FLASH FLOODING THIS EVENING. AS THE COLD FRONT MAKES ITS WAY SOUTHWARD THIS EVENING...RAINFALL WILL BEGIN TO TAPER OFF. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... NO HAZARDOUS WEATHER IS EXPECTED. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS AFTERNOON AND EVENING. ARZ072-073-LAZ001>006-010>014-017>022-TXZ124>126-136>138-149>153- 165>167-171730- COLUMBIA-UNION AR-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN- UNION LA-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE LA- NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-WOOD-UPSHUR-MARION- SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY- ANGELINA-SAN AUGUSTINE-SABINE TX- 1217 PM CDT SAT MAY 16 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...SOUTHWEST ARKANSAS...NORTH CENTRAL LOUISIANA... NORTHWEST LOUISIANA...EAST TEXAS AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... ORGANIZED THUNDERSTORMS ARE EXPECTED DURING THE EARLY EVENING NORTH OF THE INTERSTATE 30 CORRIDOR...SOME OF WHICH MAY BECOME SEVERE...AS A COLD FRONT MAKES ITS WAY THROUGH THE FOUR STATE REGION. A FEW OF THESE STORMS MAY PRODUCE DAMAGING WINDS CAPABLE OF DOWNING TREES AND POWERLINES. IN ADDITION...THE COLD FRONT MAY MOVE SLOWLY ENOUGH THAT THUNDERSTORMS BEGIN TO TRAIN ALONG THE BOUNDARY. AS A RESULT...A FEW LOCATIONS MAY EXPERIENCE LOCALIZED FLASH FLOODING. THE COLD FRONT WILL FILTER INTO THE I-20 CORRIDOR THIS EVENING AND THE THREAT FOR THUNDERSTORMS WILL BEGIN TO SUBSIDE DURING THE OVERNIGHT HOURS FOR THE AREAS NORTH OF I-20. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... SHOWERS AND THUNDERSTORMS WILL BE ONGOING OVERNIGHT ALONG AND SOUTH OF I-20. STRONG THUNDERSTORMS OR POSSIBLE ORGANIZED BOWING SEGMENTS MAY PRODUCE DAMAGING WINDS AS HIGH AS 60 MPH. EXPECT THE THUNDERSTORM ACTIVITY TO BEGIN TO PUSH OUT OF THE FOUR STATE AREA DURING THE AFTERNOON HOURS ON SUNDAY. THE REST OF THE NEW WEEK IS EXPECTED TO BE FAIR AND COOL. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION MAY BE NEEDED THIS EVENING AND DURING THE EARLY MORNING HOURS OF SUNDAY AS THUNDERSTORMS DEVELOP AHEAD OF AN APPROACHING COLD FRONT. 18
In the hours before
Local storm report, May 16, 2:30 PM CDT, 45 minutes before
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</html>The office that day
Everything else NWS Shreveport, LA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 16, 6:18 AM CDT | Flash Flood Warning | SHV | Hempstead, Howard, Little River, Nevada, Sevier | 3 hr |
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.