Alert archive / Texas / Flash Flood Watches in 2015
Flash Flood Watch 9, NWS Shreveport, LA
NWS Shreveport, LA issued this flash flood watch at May 17, 2015, 4:22 PM CDT for 21 counties in Texas; 17 parishes in Louisiana; 9 counties in Arkansas. It took effect at May 17, 2015, 10:00 PM CDT. It was in force for 18 hr.
The area
The counties it named.
The facts
- Issued
- May 17, 2015, 4:22 PM CDT (21:22 UTC)
- In effect from
- May 17, 2015, 10:00 PM CDT
- Expired
- May 18, 2015, 3:56 PM CDT
- In force
- 18 hr
- Issued by
- NWS Shreveport, LA
- Flood severity
- None
All 47 counties
Columbia County, AR, Hempstead County, AR, Howard County, AR, Lafayette County, AR, Little River County, AR, Miller County, AR, Nevada County, AR, Sevier County, AR, Union County, AR, Bienville Parish, LA, Bossier Parish, LA, Caddo Parish, LA, Caldwell Parish, LA, Claiborne Parish, LA, De Soto Parish, LA, Grant Parish, LA, Jackson Parish, LA, LaSalle Parish, LA, Lincoln Parish, LA, Natchitoches Parish, LA, Ouachita Parish, LA, Red River Parish, LA, Sabine Parish, LA, Union Parish, LA, Webster Parish, LA, Winn Parish, LA, Angelina County, TX, Bowie County, TX, Camp County, TX, Cass County, TX, Cherokee County, TX, Franklin County, TX, Gregg County, TX, Harrison County, TX, Marion County, TX, Morris County, TX, Nacogdoches County, TX, Panola County, TX, Red River County, TX, Rusk County, TX, Sabine County, TX, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX
The nearest sounding before it
Lake Charles Mun, LA (KLCH), launched 12:00Z, 9.4 hours before the alert went out and 282 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
- 2562 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 613 m above ground
- 0-6 km bulk shear
- 16 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 125 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this flash flood watch 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 flash flood watch went out at May 17, 1:01 PM CDT, 3 hours 21 minutes earlier.
Area forecast discussion, May 17, 1:01 PM CDT, 3 hours 21 minutes before
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</html>Hazardous weather outlook, May 17, 12:11 PM CDT, 4 hours 11 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1211 PM CDT SUN MAY 17 2015 ARZ050-051-059>061-070>073-LAZ001>004-OKZ077-TXZ096-097-108>112- 124>126-136>138-149>151-181100- SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE- COLUMBIA-UNION-CADDO-BOSSIER-WEBSTER-CLAIBORNE-MCCURTAIN- RED RIVER-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR- MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA- 1211 PM CDT SUN MAY 17 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTH CENTRAL ARKANSAS...SOUTHWEST ARKANSAS...NORTHWEST LOUISIANA...SOUTHEAST OKLAHOMA AND NORTHEAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL CONTINUE TO SPREAD EAST OUT OF EAST TEXAS...SOUTHEAST OKLAHOMA...AND SOUTHWEST ARKANSAS BY EARLY TO MID AFTERNOON. HOWEVER...BRIEF HEAVY RAINFALL AND LOCALLY GUSTY WINDS WILL BE POSSIBLE WITH THE STRONGER STORMS. ADDITIONAL SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO REDEVELOP LATE TONIGHT OVER NORTHEAST TEXAS...SOUTHEAST OKLAHOMA...SOUTHWEST ARKANSAS AND NORTHWEST LOUISIANA...AHEAD OF ANOTHER UPPER LEVEL DISTURBANCE THAT WILL MOVE NORTHEAST OVER THE REGION. LOCALLY HEAVY RAINFALL AND THE THREAT FOR FLASH FLOODING WILL AGAIN EXIST LATE TONIGHT...WITH ADDITIONAL RAINFALL AMOUNTS OF ONE TO THREE INCHES POSSIBLE OVER ALREADY SATURATED GROUNDS. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS WILL BE ONGOING MONDAY MORNING ACROSS THE REGION...GRADUALLY SHIFTING EAST BY AFTERNOON. THE HEAVY RAINFALL AND FLASH FLOOD THREAT WILL CONTINUE THROUGH THAT TIME BEFORE DIMINISHING DURING THE AFTERNOON. ADDITIONAL ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE TUESDAY THROUGH SATURDAY...AS A COUPLE OF WEAK SURFACE FRONTS BACKDOOR THEIR WAY INTO THE REGION AND BECOME STATIONARY. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND AMATEUR RADIO OPERATORS...MAY BE NEEDED TONIGHT FOR HEAVY RAINFALL AND FLASH FLOOD REPORTS. LAZ005-006-010>014-017>022-TXZ152-153-165>167-181100- LINCOLN-UNION-DE SOTO-RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE- NATCHITOCHES-WINN-GRANT-CALDWELL-LA SALLE-NACOGDOCHES-SHELBY- ANGELINA-SAN AUGUSTINE- 1211 PM CDT SUN MAY 17 2015 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL LOUISIANA...NORTHWEST LOUISIANA AND EAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON AND EVENING OVER DEEP EAST TEXAS AND NORTHCENTRAL LOUISIANA...AS A DECAYING COMPLEX OF THUNDERSTORMS OVER EAST TEXAS AND NORTHWEST LOUISIANA MOVE INTO A VERY MOIST AND UNSTABLE AIR MASS. ISOLATED STRONG STORMS CAPABLE OF PRODUCING DAMAGING WINDS AND BRIEF HEAVY RAINFALL WILL BE POSSIBLE BEFORE DIMINISHING LATE IN THE DAY. ADDITIONAL SCATTERED SHOWERS AND THUNDERSTORMS ARE EXPECTED TO REDEVELOP LATE TONIGHT OVER EAST TEXAS...SOUTHWEST ARKANSAS AND NORTHWEST LOUISIANA...AND MAY MOVE INTO THE AREA BY DAYBREAK MONDAY. .DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY... SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS SHOULD BE ONGOING ACROSS THE AREA MONDAY...AND SHOULD GRADUALLY SPREAD EAST SOUTHEAST OVER THE REGION...DIMINISHING BY LATE AFTERNOON. LOCALLY HEAVY RAINFALL AND ISOLATED STRONG STORMS CAPABLE OF PRODUCING DAMAGING WINDS WILL BE POSSIBLE MONDAY BEFORE THE STORMS EXIT THE REGION. ADDITIONAL ISOLATED TO SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE TUESDAY THROUGH SATURDAY...AS A COUPLE OF WEAK SURFACE FRONTS BACKDOOR THEIR WAY INTO THE REGION AND BECOME STATIONARY. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND AMATEUR RADIO OPERATORS...MAY BE NEEDED THIS AFTERNOON AND EVENING FOR ISOLATED SEVERE THUNDERSTORM REPORTS. 15
In the hours before
Special weather statement, May 17, 2:39 PM CDT, 1 hour 43 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 17, 5:32 AM CDT | Flash Flood Warning | SHV | Bowie, Franklin, Morris, Red River, Titus | 3 hr |
| May 17, 8:29 AM CDT | Areal Flood Advisory | SHV | Bowie, Camp, Franklin, Morris, Red River, Titus and 1 more | 3 hr |
| May 17, 11:31 AM CDT | River Flood Warning | SHV | Franklin, Morris, Red River, Titus | 20 days |
| May 17, 11:31 AM CDT | River Flood Warning | SHV | Wood | 5 days |
| May 17, 11:32 AM CDT | River Flood Warning | SHV | Franklin, Morris, Titus | 15 days |
| May 17, 2:46 PM CDT | River Flood Warning | SHV | Nacogdoches, Rusk, San Augustine, Shelby | 21 days |
| May 17, 2:39 PM CDT | Special Weather Statement | SHV | Jackson, Winn | 66 min |
| May 17, 3:06 PM CDT | Special Weather Statement | SHV | Caldwell | 54 min |
| May 17, 3:36 PM CDT | Special Weather Statement | SHV | Ouachita | 54 min |
| May 17, 5:08 AM CDT | Special Weather Statement | SHV | Sevier | 67 min |
Nearby
Flash Flood Watches in Texas, 2015Flash Flood Watches in Louisiana, 2015Flash Flood Watches in Arkansas, 2015Every flash flood watch in 2015
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.