Alert archive / Texas / Flash Flood Watches in 2015

Flash Flood Watch 7, NWS Shreveport, LA

May 13, 201520 counties in Texas

NWS Shreveport, LA issued this flash flood watch at May 13, 2015, 3:37 PM CDT for 20 counties in Texas. It took effect at May 13, 2015, 4:00 PM CDT. It was in force for 6 hr.

The area

The counties it named.

The facts

Issued
May 13, 2015, 3:37 PM CDT (20:37 UTC)
In effect from
May 13, 2015, 4:00 PM CDT
Expired
May 13, 2015, 9:30 PM CDT
In force
6 hr
Issued by
NWS Shreveport, LA
Flood severity
None

Counties 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, San Augustine County, TX, Shelby County, TX, Smith County, TX, Titus County, TX, Upshur County, TX, Wood County, TX

The radar

The Shreveport radar (KSHV), 84 km from the middle of the area, began a volume at 20:37 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 nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 8.6 hours before the alert went out and 92 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 12:00Z on 2015-05-13Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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 12:00Z on 2015-05-13The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 148 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
817 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
148 m²/s²
0-3 km storm-relative helicity
249 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

Open this sounding in Storm Lab

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 13, 12:34 PM CDT, 3 hours 3 minutes earlier.

Area forecast discussion, May 13, 12:34 PM CDT, 3 hours 3 minutes before
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Hazardous weather outlook, May 13, 12:00 PM CDT, 3 hours 37 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1200 PM CDT WED MAY 13 2015

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-141700-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
COLUMBIA-UNION-CADDO-BOSSIER-WEBSTER-CLAIBORNE-LINCOLN-DE SOTO-
RED RIVER-BIENVILLE-JACKSON-OUACHITA-SABINE-NATCHITOCHES-WINN-
GRANT-CALDWELL-LA SALLE-
1200 PM CDT WED MAY 13 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR MUCH OF SOUTH ARKANSAS AND
FOR ALL OF NORTH LOUISIANA.

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

SCATTERED RAIN SHOWERS AND ISOLATED THUNDERSTORMS WILL BE
POSSIBLE...AS AN UPPER LEVEL DISTURBANCE APPROACHES THE REGION
TODAY. HOWEVER...HAZARDOUS WEATHER IS NOT ANTICIPATED AT THIS
TIME.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

SCATTERED THUNDERSTORMS WILL REMAIN IN THE FORECAST THROUGH MUCH
OF THE WEEK AS A WARM FRONT BEGINS LIFTING BACK NORTHWARD ACROSS
THE AREA. MUCH OF THIS WILL BE HIT OR MISS DAYTIME ACTIVITY. AND
WHILE THE SEVERE WEATHER THREAT LOOKS TO BE VERY MINIMAL OVER THE
NEXT SEVERAL DAYS...ANY ADDITIONAL RAIN COMBINED WITH CURRENT
CREST EXPECTATIONS COULD LEAD TO ADDITIONAL FLOODING OF SOME AREA
LAKES AND RIVERS.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS AND STORM SPOTTERS WILL NOT BE NEEDED THROUGH TONIGHT.

OKZ077-TXZ096-097-108>112-124>126-136>138-149>153-165>167-141700-
MCCURTAIN-RED RIVER-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-
UPSHUR-MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA-
NACOGDOCHES-SHELBY-ANGELINA-SAN AUGUSTINE-SABINE-
1200 PM CDT WED MAY 13 2015

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF SOUTHEAST
OKLAHOMA...EAST TEXAS AND NORTHEAST TEXAS.

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

SHOWERS AND ISOLATED THUNDERSTORMS WILL BE POSSIBLE...AS AN UPPER
LEVEL DISTURBANCE APPROACHES THE REGION TODAY. WHILE WIDESPREAD
FLOODING ISSUES ARE NOT ANTICIPATED AT THIS TIME...A FEW ISOLATED
TROUBLE SPOTS CANNOT BE RULED OUT...ESPECIALLY UNDER HEAVIER
DOWNPOURS OR WHERE PREVIOUS HEAVY RAINFALL HAS OCCURRED.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY...

SCATTERED THUNDERSTORMS WILL REMAIN IN THE FORECAST THROUGH MUCH
OF THE NEXT WEEK AS A WARM FRONT BEGINS LIFTING BACK NORTHWARD
ACROSS THE AREA. THE POSSIBILITY FOR HEAVY RAINFALL WILL CREEP IN
LATE SATURDAY INTO SUNDAY...AS A COLD FRONT APPROACHES THE REGION
AND BECOMES STALLED ACROSS PARTS OF SOUTHEAST OKLAHOMA...NORTHEAST
TEXAS...AND SOUTHWEST ARKANSAS. WHILE THE SEVERE WEATHER THREAT
LOOKS TO BE VERY MINIMAL OVER THE NEXT SEVERAL DAYS...ANY
ADDITIONAL RAIN COMBINED WITH CURRENT CREST EXPECTATIONS COULD
LEAD TO ADDITIONAL FLOODING OF SOME AREA LAKES AND RIVERS.

.SPOTTER INFORMATION STATEMENT...

ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...AMATEUR RADIO
OPERATORS AND STORM SPOTTERS WILL NOT BE NEEDED THROUGH TONIGHT.

24

The office that day

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

IssuedProductOfficeCountiesLasted
May 13, 12:53 PM CDTRiver Flood WarningSHVPanola, Shelby9 days
May 13, 6:06 PM CDTAreal Flood AdvisorySHVGregg114 min
May 13, 6:07 PM CDTFlash Flood WarningSHVCherokee, Nacogdoches, Rusk3 hr

Nearby

Flash Flood Watches in Texas, 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; radar from the NEXRAD Level II archive.