Alert archive / Texas / Flash Flood Warnings in 2010

Flash Flood Warning 14, NWS Shreveport, LA

July 26, 2010Angelina County, Texas

NWS Shreveport, LA issued this flash flood warning at Jul 26, 2010, 3:32 PM CDT for Angelina County, Texas. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jul 26, 2010, 3:32 PM CDT (20:32 UTC)
Expired: Jul 26, 2010, 6:30 PM CDT
In force: 3 hr
Issued by: NWS Shreveport, LA
Area: Storm-based polygon
Flood severity: None

County Angelina County, TX

The radar

The Shreveport radar (KSHV), 152 km from the middle of the area, began a volume at 20:33 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

Fort Worth, TX (KFWD), launched 12:00Z, 8.5 hours before the alert went out and 307 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: 1744 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1395 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 13 m²/s²
0-3 km storm-relative helicity: 4 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this flash flood 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 flash flood warning went out at Jul 26, 3:16 PM CDT, 16 minutes earlier.

Area forecast discussion, Jul 26, 3:16 PM CDT, 16 minutes before

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Hazardous weather outlook, Jul 26, 11:51 AM CDT, 3 hours 41 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE SHREVEPORT LA
1151 AM CDT MON JUL 26 2010

ARZ050-051-059>061-070>073-LAZ001>006-010>014-017>022-OKZ077-
TXZ096-097-108>112-124>126-136>138-149>153-165>167-271700-
SEVIER-HOWARD-LITTLE RIVER-HEMPSTEAD-NEVADA-MILLER-LAFAYETTE-
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-MCCURTAIN-BOWIE-
FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD-UPSHUR-MARION-SMITH-GREGG-
HARRISON-CHEROKEE-RUSK-PANOLA-NACOGDOCHES-SHELBY-ANGELINA-
SAN AUGUSTINE-SABINE TX-
1151 AM CDT MON JUL 26 2010

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

.DAY ONE...THIS AFTERNOON AND TONIGHT...
A WARM AND MOIST AIRMASS IS IN PLACE ACROSS THE REGION TODAY ON
THE EAST SIDE OF AN UPPER LEVEL LOW WHICH IS SPINNING OVER NORTH
CENTRAL TEXAS. AS A RESULT...SCATTERED TO NUMEROUS SHOWERS AND
THUNDERSTORMS WILL DEVELOP TODAY AND TONIGHT. THESE SHOWERS AND
THUNDERSTORMS WILL BE VERY EFFICIENT RAINMAKERS DUE TO THE HIGH
AMOUNT OF MOISTURE IN THE ATMOSPHERE AND THEIR SLOW MOVEMENT. HEAVY RAINS
CAN PRODUCE PONDING OF WATER IN STREETS...LOW LYING...AND POOR
DRAINAGE AREAS. GUSTY WINDS OF 30 TO 35 MPH AND LIGHTNING WILL
ACCOMPANY THE STRONGER STORMS. A FEW STORMS MAY BECOME SEVERE THIS
AFTERNOON AND EVENING...HOWEVER...THOSE WILL BE MORE ISOLATED IN
NATURE.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY...
SHOWERS AND THUNDERSTORMS WILL CONTINUE TO OCCUR IN A WARM...MOIST
AND UNSTABLE ATMOSPHERE THROUGH MID WEEK UNTIL HIGH PRESSURE OFF TO
THE EAST BUILDS BACK OVER THE FOUR STATE REGION.  DEADLY LIGHTNING
AND BRIEF BUT LOCALLY HEAVY RAINFALL WILL BE POSSIBLE WITH THE
STORMS...AS THEY MOVE ACROSS THE AREA. HEAVY RAINS CAN PRODUCE
PONDING OF WATER IN STREETS...LOW LYING...AND POOR DRAINAGE AREAS.
GUSTY WINDS OF 30 TO 35 MPH MAY ACCOMPANY THE STRONGER THUNDERSTORMS.
ISOLATED THUNDERSTORMS MAY BECOME SEVERE AND PRODUCE MAINLY HIGH WIND
GUSTS. AFTER MID WEEK UNDER THE INFLUENCE OF HIGH PRESSURE ALOFT...
RAIN CHANCES WILL BE DECREASING WITH TEMPERATURES CLIMBING BACK TO
THE MID 90S TO NEAR 100 DEGREES.

.SPOTTER INFORMATION STATEMENT...
THE ACTIVATION OF EMERGENCY MANAGEMENT PERSONNEL...STORM SPOTTERS...
AND HAM RADIO OPERATORS IS NOT EXPECTED THROUGH TONIGHT.

04

In the hours before

Special weather statement, Jul 26, 1:28 PM CDT, 2 hours 4 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SHREVEPORT LA
128 PM CDT MON JUL 26 2010

LAZ001-010-TXZ151-261930-
CADDO-DE SOTO-PANOLA-
128 PM CDT MON JUL 26 2010

...SIGNIFICANT WEATHER ADVISORY...

THE NATIONAL WEATHER SERVICE IN SHREVEPORT HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY...EFFECTIVE UNTIL 230 PM CDT...FOR THE FOLLOWING
PARISHES AND COUNTIES...

IN NORTHWEST LOUISIANA...
     CADDO AND DE SOTO...
IN NORTHEAST TEXAS...
     PANOLA...

INCLUDING THE FOLLOWING LOCATIONS...
     LOGANSPORT AND DEBERRY...

AT 127 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS WERE
DETECTING A STRONG THUNDERSTORM 8 MILES NORTH OF JOAQUIN...OR 17
MILES EAST OF CARTHAGE...MOVING NORTHWEST AT 5 MPH. THIS STORM IS
LIKELY PRODUCING STRONG WIND GUSTS TO NEAR 40 MPH...ALONG WITH VERY
HEAVY RAINFALL RATES OF NEAR TWO INCHES PER HOUR. DIME SIZE HAIL IS
POSSIBLE WITH THIS THUNDERSTORM AS WELL.

13

Special weather statement, Jul 26, 2:12 PM CDT, 1 hour 20 minutes before

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Local storm report, Jul 26, 2:38 PM CDT, 54 minutes before

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Local storm report, Jul 26, 2:46 PM CDT, 46 minutes before

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Local storm report, Jul 26, 3:29 PM CDT, 3 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
Jul 25, 11:11 PM CDT	Severe Thunderstorm Warning	SHV	Camp, Cass, Marion, Morris, Titus	33 min
Jul 26, 1:43 PM CDT	Severe Thunderstorm Warning	SHV	Panola, Shelby	41 min
Jul 26, 3:20 PM CDT	Severe Thunderstorm Warning	SHV	Angelina, Nacogdoches	40 min
Jul 26, 2:02 PM CDT	Severe Thunderstorm Warning	SHV	Bossier, Webster	43 min
Jul 26, 2:50 PM CDT	Severe Thunderstorm Warning	SHV	Bienville, Webster	40 min
Jul 26, 3:31 PM CDT	Severe Thunderstorm Warning	SHV	Claiborne, Lincoln, Union	44 min
Jul 26, 5:07 PM CDT	Severe Thunderstorm Warning	SHV	Jackson, Ouachita, Winn	38 min
Jul 26, 6:09 PM CDT	Areal Flood Advisory	SHV	Jackson, Lincoln, Ouachita, Union	51 min
Jul 25, 7:03 PM CDT	Areal Flood Advisory	SHV	Sevier	57 min
Jul 26, 3:09 PM CDT	Severe Thunderstorm Warning	SHV	Hempstead	36 min
Jul 26, 4:04 PM CDT	Severe Thunderstorm Warning	SHV	Howard	41 min

Nearby

Flash Flood Warnings in Texas, 2010 Every flash flood warning in 2010

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.