Scattered showers and thunderstorms developed in a very unstable and moist airmass on the afternoon of July 10th. This activity produced storms that dumped excessive heavy rainfall in a short amount of time.
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Deaths and injuries are direct and indirect together, as the offices filed them. Damage is property and crops in the dollars of the year, not adjusted for inflation, and only where an office estimated it.
The episode as NWS SHV wrote it up.
Scattered showers and thunderstorms developed in a very unstable and moist airmass on the afternoon of July 10th. This activity produced storms that dumped excessive heavy rainfall in a short amount of time. These storms fell across already wet soils and as a result...produced high water in usual flood prone areas in Harrison County Texas.
The local office's own words before the first event, 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 the first event at Jul 10, 2:58 PM CST, 26 minutes earlier.
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SHREVEPORT LA 358 PM CDT SAT JUL 10 2010 .DISCUSSION... ORIGINAL CONVECTION TO THE N ACROSS EXTREME NE TX/SW AR HAS DIMINISHED THIS AFTERNOON...BUT ADDITIONAL SCT CONVECTION HAS DEVELOPED ALONG THE BROAD DIFFERENTIAL HEATING/INSTABILITY AXIS TO THE S TOWARDS THE I-20 CORRIDOR OF NE TX/N LA...WHERE THE WEAK UPPER LEVEL SHEAR AXIS REMAINS PER WATER VAPOR LOOP. A SFC REPORT EARLIER THIS AFTERNOON JUST NE OF MLU (NEAR SWARTZ) HAVE INDICATED 1.72" FALLING IN 35 MINUTES...WHICH RESULTS IN HOURLY RAINFALL RATES IN EXCESS OF 3.25"/HR. THUS...THE 88-D LOOKS TO BE UNDERESTIMATING HOURLY RAINFALL RATES FROM THE CONVECTION...WITH LOCALIZED FLOODING POSSIBLE WHERE THESE STORMS MOVE ACROSS. HOWEVER...AM EXPECTING THIS CONVECTION TO DIMINISH LATER THIS EVENING WITH THE LOSS OF HEATING/INSTABILITY...POSSIBLY LINGERING THROUGH A GOOD PORTION OF THE EVENING ACROSS NCNTRL LA...WHERE SFC BASED CAPES PER THE 20Z LAPS ANALYSIS ARE NOW UP TO 3000 J/KG. WILL CONTINUE WITH CHANCE POPS THIS EVENING FOR MUCH OF THE AREA THIS EVENING...BEFORE DECREASING POPS TO SLIGHT CHANCE LATE. GIVEN PAST TEMP/DEWPOINT TRENDS IN THIS TROPICAL AIR MASS...HAVE ALSO TRENDED MIN TEMPS 2-3 DEGREES ABOVE MOS...WHICH HAS SHOWN A TENDENCY OF RUNNING TOO COOL AS OF LATE. THIS VERY TROPICAL AIR MASS IS EXPECTED TO REMAIN IN PLACE THROUGH SUNDAY AS WELL...WITH THE 12 AND 18Z NAM INDICATING 850MB THETA-E RIDGING ONCE AGAIN AS THE SHEAR AXIS PERSISTS OVERHEAD. PW/S ARE EXPECTED TO REMAIN NEAR 2.25"...WITH CONVECTION DEVELOPING ATOP THE NRN MX/SW TX FLAT UPPER RIDGE EXTENDING TO THE GULF COAST STATES. LOCALLY HEAVY RAINFALL WILL AGAIN BE POSSIBLE IN THE STRONGER STORMS...BUT THE DISAGREEMENT WITH THE GFS LEADS TO A SOMEWHAT LOWER THAN CONFIDENCE FORECAST...AS DRIER AIR BEGINS TO BECOME ENTRAINED FROM THE NW. HOWEVER...DID INCLUDE MENTION IN THE HWO...WITH LATER SHIFTS MONITORING THIS POTENTIAL IN THE SUBSEQUENT FORECAST. THE FLAT RIDGE WILL BEGIN TO ERODE FROM THE NW AS THE NEXT SHORTWAVE OVER MT/ID BEGINS TO DRIFT SE ACROSS THE ROCKIES SUNDAY AND INTO THE PLAINS MONDAY. A 30+KT SWRLY LLJ IS EXPECTED TO DEVELOP ACROSS CNTRL TX/OK SUNDAY NIGHT...SOME OF WHICH WILL MIX DOWN TO THE SFC...RESULTING IN A STRATUS DECK QUICKLY ADVECTING INTO THE AREA LATE. THIS WILL HELP TO HOLD TEMPS UP SUNDAY NIGHT...BUT ALSO ENHANCE CAPPING OVER THE LOWER MS VALLEY...WITH SCT CONVECTION DEVELOPING FROM THE TX PANHANDLE INTO CNTRL OK/NRN AR MONDAY. THE TAIL END OF THE TROUGH AXIS IS EXPECTED TO RIDE THE TOP OF THE RIDGE ACROSS SE OK/SW AR MONDAY NIGHT...BUT MAY BEGIN TO WEAKEN OVERNIGHT WITH THE LOSS OF HEATING/INSTABILITY. SW AR WILL REMAIN THE FAVORABLE AREA FOR CONVECTION TUESDAY AS THE RESIDUAL SHEAR AXIS LINGERS OVER THE AREA...ALTHOUGH THIS BNDRY MAY SEEP SE ACROSS N LA/E TX AS THE SW U.S RIDGE BEGINS TO AMPLIFY OVER THE ROCKIES. MAINLY DIURNAL ISOLATED CONVECTION IS EXPECTED AS RESIDUAL SHEAR AXIS SHOULD LINGER ALONG THE E SIDE OF THE RIDGE AS IT PERSISTS THROUGH THE REMAINDER OF THE WEEK/WEEKEND...PER THE ECMWF. HAVE MAINTAINED SLIGHT CHANCE POPS EACH DAY...WITH TEMPS NEAR/SLIGHTLY ABOVE MOS...WHICH WILL BE DETERMINED BY THE EXTENT OF SOIL MOISTURE IN WAKE OF A WET WEEK. THUS...WARMER IN THE E WHERE THE SVR/EXTREME DROUGHT PERSISTS...AND SLIGHTLY COOLER IN THE W...WHICH REMAIN MORE MOIST. PRELIMS TO FOLLOW BELOW... 15 && .AVIATION... SCATTERED TO NUMEROUS SHOWERS AND THUNDERSTORMS NOW COVERING MUCH OF THE REGION THIS AFTERNOON. NEW STORMS WILL LIKELY DEVELOP ALONG RESIDUAL OUTFLOW BOUNDARIES PRODUCED BY EARLIER CONVECTION. TERMINALS WILL LIKELY DEAL WITH THIS HIT OR MISS ACTIVITY THROUGH AT LEAST 02Z OR SO THIS EVENING. AFTER SUNSET...ONCE THE BOUNDARY LAYER BEGINS TO STABILIZE...PRECIPITATION COVERAGE AND INTENSITY SHOULD BEGIN TO WANE. SHOULD REMAIN VFR THROUGH THE TAF PERIOD EXCEPT WHERE THESE BRIEF DOWNPOURS RESULT IN TEMPORARY MVFR/IFR CEILINGS AND VSBYS. CANNOT RULE OUT SCATTERED SHOWERS REMAINING INTO THE OVERNIGHT HOURS BUT THIS WOULD LIKELY AFFECT THE TXK/ELD TERMINALS ONLY. COULD BE SOME PATCHY MVFR VSBY PROBLEMS IN A FEW LOCATIONS EARLY SUNDAY MORNING DUE TO THE WET CONDITIONS BUT WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WILL ONCE AGAIN BE A POSSIBILITY WITH THE HEATING OF THE DAY ON SUNDAY. /13/ && .PRELIMINARY POINT TEMPS/POPS... SHV 75 93 77 95 76 / 30 40 20 20 10 MLU 75 93 76 96 76 / 30 50 20 20 10 DEQ 72 88 74 93 74 / 30 50 20 20 20 TXK 74 88 75 93 75 / 30 50 20 20 20 ELD 74 90 75 95 75 / 30 50 20 20 20 TYR 75 93 77 93 76 / 30 30 10 20 20 GGG 75 93 76 94 76 / 30 30 10 20 20 LFK 76 95 76 95 76 / 20 20 10 20 10 && .SHV WATCHES/WARNINGS/ADVISORIES... AR...NONE. LA...NONE. OK...NONE. TX...NONE. && 15/13
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE SHREVEPORT LA 1203 PM CDT SAT JUL 10 2010 ARZ050-051-059>061-070>073-LAZ001>006-010>014-019-021-OKZ077- TXZ096-097-108>112-124>126-136>138-149>153-121100- 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-WINN- CALDWELL-MCCURTAIN-BOWIE-FRANKLIN-TITUS-CAMP-MORRIS-CASS-WOOD- UPSHUR-MARION-SMITH-GREGG-HARRISON-CHEROKEE-RUSK-PANOLA- NACOGDOCHES-SHELBY- 1203 PM CDT SAT JUL 10 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... PERIODS OF SHOWERS AND EMBEDDED THUNDERSTORMS WILL CONTINUE TO DEVELOP AND SPREAD EAST SOUTHEAST ACROSS EXTREME NORTHEAST TEXAS...SOUTHWEST ARKANSAS...AND NORTHERN LOUISIANA THIS AFTERNOON...ALONG A WEAK UPPER LEVEL DISTURBANCE THAT WILL DRIFT SLOWLY EAST SOUTHEAST AS WELL. SOME OF THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL...FREQUENT LIGHTNING...AND GUSTY WINDS TO 40 MPH. RAINFALL RATES OF ONE TO TWO INCHES PER HOUR WILL BE POSSIBLE...AND WILL FALL OVER AREAS THAT HAVE SEEN ONE TO TWO INCHES OF RAIN IN THE LAST WEEK...WITH ISOLATED HIGHER AMOUNTS OF THREE TO FIVE INCHES OVER NORTHEAST TEXAS. THUS...THE HEAVIER DOWNPOURS WILL RESULT IN RAPID RUNOFF...AND COULD PRODUCE LOCALIZED FLOODING OF LOW LYING...POOR DRAINAGE AREAS. THE SHOWERS AND THUNDERSTORMS SHOULD BEGIN TO DIMINISH LATER THIS EVENING WITH THE LOSS OF DAYTIME HEATING AND UPPER LEVEL SUPPORT. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE ACROSS EXTREME NORTHEAST TEXAS...SOUTHEAST OKLAHOMA...SOUTHWEST ARKANSAS...AND EXTREME NORTHERN LOUISIANA SUNDAY...AS DAYTIME HEATING INCREASES ALONG A WEAK UPPER LEVEL DISTURBANCE THAT WILL REMAIN OVER THE AREA. GIVEN THE TROPICAL AIR MASS THAT WILL REMAIN IN PLACE AGAIN SUNDAY...SOME OF THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING LOCALLY HEAVY RAINFALL ONCE AGAIN...ALTHOUGH THESE ARE EXPECTED TO DIMINISH BY SUNDAY EVENING. ISOLATED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE MONDAY THROUGH FRIDAY...GIVEN THE LOW LEVEL MOISTURE IN PLACE AND STRONG HEATING THAT WILL RESULT AS AFTERNOON TEMPERATURES CLIMB INTO THE LOWER AND MID 90S EACH DAY. .SPOTTER INFORMATION STATEMENT... ACTIVATION OF EMERGENCY MANAGERS...SKYWARN NETWORKS...AND HAM RADIO OPERATORS...MAY BE NEEDED THIS AFTERNOON FOR ANY LOCALIZED INSTANCES OF FLOODING. LAZ017-018-020-022-TXZ165>167-121100- SABINE LA-NATCHITOCHES-GRANT-LA SALLE-ANGELINA-SAN AUGUSTINE- SABINE TX- 1203 PM CDT SAT JUL 10 2010 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTH CENTRAL LOUISIANA...NORTHWEST LOUISIANA AND EAST TEXAS. .DAY ONE...THIS AFTERNOON AND TONIGHT... WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE THIS AFTERNOON OVER DEEP EAST TEXAS AND THE SOUTHERN SECTIONS OF NORTHCENTRAL LOUISIANA...AS ABUNDANT LOW LEVEL MOISTURE INTERACTS WITH DAYTIME HEATING AND AN UPPER LEVEL DISTURBANCE OVER EXTREME NORTHEAST TEXAS AND SOUTHWEST ARKANSAS...THAT WILL DRIFT EAST SOUTHEAST LATER TODAY. SOME OF THE STRONGER STORMS WILL BE CAPABLE OF PRODUCING BRIEF HEAVY RAINFALL...FREQUENT LIGHTNING...AND WIND GUSTS TO 40 MPH. SHOWERS AND THUNDERSTORMS THAT DO DEVELOP WILL DIMINISH LATER THIS EVENING WITH THE LOSS OF DAYTIME HEATING. .DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY... ALTHOUGH WIDELY SCATTERED SHOWERS AND THUNDERSTORMS WILL BE POSSIBLE SUNDAY...MAINLY ACROSS THE SOUTHERN SECTIONS OF NORTHCENTRAL LOUISIANA...SHOWERS AND THUNDERSTORMS ARE EXPECTED TO BECOME MORE ISOLATED AREAWIDE MONDAY THROUGH FRIDAY...GIVEN THE LOW LEVEL MOISTURE IN PLACE AND STRONG HEATING THAT WILL RESULT AS AFTERNOON TEMPERATURES CLIMB INTO THE LOWER AND MID 90S EACH DAY. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION WILL NOT BE NEEDED THIS AFTERNOON AND TONIGHT. 15
The national radar mosaic for the moment the first event began.
1 heavy rain. Local standard time, as filed.
Rainfall over two inches in a short period of time resulted in high water across portions of town. The water closed a few city streets in usual flood prone areas. One of these included West Houston Street.
After NWS Directive 10-1605, the rules offices file Storm Data by.
Every storm in Texas in 2010Every state in 2010This day in weather historyWarnings in Texas, July 2010
NOAA National Centers for Environmental Information, Storm Events Database, compiled from the National Weather Service’s monthly Storm Data. Complete through 2026-06; NCEI adds each month about 75 days after it ends and revises past years a few times a year. Rebuilt 2026-09-24. Each event’s entry at NCEI: 231446.