Flash Flood Warning 160, NWS Fort Worth, TX

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
902 AM CDT SUN JUN 21 2015

.UPDATE...
MODERATE TO HEAVY RAIN CONTINUES TO FALL ACROSS THE NORTHEASTERN
COUNTIES OF THE CWA WHERE HI RES GUIDANCE CONTINUES TO INDICATE
RAIN WILL PERSIST INTO THE EARLY AFTERNOON HOURS. ROCKWALL COUNTY
AND SOUTHERN COLLIN COUNTY HAVE ALREADY RECEIVED 2-4 INCHES OF
RAINFALL IN LESS THAN AN HOUR OR TWO AND THE HEAVY RAINFALL IS
NOW MOVING INTO HUNT AND FANNIN COUNTIES. HAVE ISSUED A FLASH
FLOOD WATCH FOR LOCATIONS ALONG AND EAST OF A LINE FROM GRAYSON TO
COLLIN COUNTY THROUGH 4 PM THIS AFTERNOON. ALSO INCREASED POPS IN
AND AROUND THE WATCH AREA.

TO THE SOUTHWEST AND WEST OF THE HEAVY RAIN AREA...ADDITIONAL
SCATTERED SHOWERS AND POSSIBLY THUNDERSTORMS ARE DEVELOPING BUT
ARE STRUGGLING TO PERSIST VERY LONG...LIKELY DUE TO SUBSIDENCE ON
THE BACK SIDE OF THE RAIN AREA AND THE UPPER LOW. HOWEVER...WE
WILL CONTINUE TO SEE SCATTERED RAIN ACTIVITY ACROSS THE REGION
THROUGHOUT THE DAY...OUTSIDE OF THE WATCH AREA. THE 12Z FWD
SOUNDING SHOWS A VERY MOIST ATMOSPHERE IN PLACE AND MODERATE TO
HEAVY RAINFALL WILL BE POSSIBLE WITH ANY SHOWER OR STORM BUT THE
HEAVY RAINFALL OUTSIDE OF OUR NORTHEAST COUNTIES SHOULD BE
REALATIVELY BRIEF IN TIMING GIVEN THE SHORTER LIVED NATURE OF THE
CONVECTION.

JLDUNN

&&

.AVIATION...
/ISSUED 645 AM CDT SUN JUN 21 2015/
THE PRIMARY AVIATION WEATHER CONCERN WILL BE MORNING THUNDERSTORMS
AS A WEAK UPPER LEVEL LOW MOVES NORTHEAST ACROSS THE AREA. THE
BEST FORCING SHOULD BE JUST EAST OF THE TAF SITES. BUT A VCTS IS
WARRANTED FOR ALL METROPLEX TAF SITES THROUGH MID AFTERNOON.

MVFR TO OCCASIONAL IFR CEILINGS WILL ALSO PREVAIL AT ALL NORTH
TEXAS TERMINALS THIS MORNING BUT CEILINGS SHOULD BECOME VFR BY
MIDDAY. SOME DRIER AIR WILL BEGIN TO WORK IN FROM THE WEST
BEGINNING THIS AFTERNOON AND THIS SHOULD KEEP VFR CONDITIONS
THROUGH TONIGHT.

A SOUTH WIND WILL PREVAIL THROUGH TONIGHT AT SPEEDS BETWEEN 9 AND
14 KNOTS ALONG WITH A FEW HIGHER GUSTS DURING THE DAYLIGHT HOURS.

79

&&

.PREV DISCUSSION... /ISSUED 325 AM CDT SUN JUN 21 2015/
A PERSISTENT WEAK UPPER TROUGH LINGERS OVER THE EASTERN HALF OF
THE STATE THIS MORNING AND CONTINUES TO SUPPORT SCATTERED SHOWERS
AT THIS HOUR. RADAR IMAGERY SHOWS LIGHT ECHOES FROM CENTRAL TEXAS
ALL THE WAY INTO THE ARKLATEX...ALTHOUGH ONLY A COUPLE OF SITES
ARE ACTUALLY REPORTING ANY PRECIPITATION. BASED ON RADAR/SATELLITE
IMAGERY...IT APPEARS THAT MOST OF THIS ACTIVITY IS BASED IN THE
MID LEVELS AND ANYTHING REACHING THE GROUND IS FAIRLY LIGHT AT
THIS TIME.

THESE WEAK UPPER TROUGHS OFTEN TIMES LEAD TO CHALLENGING FORECASTS
IN THE SUMMER. IN GENERAL...WHEN THESE FEATURES ARE OVERHEAD...AT
LEAST SOME SCATTERED CONVECTION IS EXPECTED. THIS IS MAINLY
BECAUSE THESE TROUGHS ARE USUALLY ASSOCIATED WITH A POCKET OF
COLDER AIR ALOFT. THIS IN TURN HELPS DESTABILIZE THE ATMOSPHERE.
CONVECTION STILL REQUIRES A FORCING MECHANISM AND IT IS THIS PART
OF THE EQUATION THAT IS DIFFICULT TO NARROW DOWN.

TODAY THE TROUGH AXIS WILL ACTUALLY BE MOVING TO OUR
NORTHEAST...BUT THE POCKET OF COLDER AIR ALOFT WILL BE POSITIONED
RIGHT OVER NORTH TEXAS. ALL OF THE MODEL GUIDANCE SUGGESTS AT
LEAST SOME SCATTERED CONVECTION ACROSS THE REGION THROUGH
AFTERNOON AND THIS MAKES SENSE GIVEN THAT THERE WILL BE MODEST
INSTABILITY AND LITTLE CAPPING. EXACTLY WHERE THESE SCATTERED
SHOWERS/STORMS DEVELOPS IS TOUGH TO SAY. AT LEAST THROUGH THE
MORNING HOURS...IT APPEARS THAT AREAS ALONG AND EAST OF I-35 WILL
HAVE THE BEST CHANCE...AS THIS IS WHERE ONGOING ACTIVITY IS
LOCATED INDICATING THE LOCATION OF CURRENT FORCING FOR ASCENT. BY
LATER TODAY...THINK THE MOST FAVORED AREA WILL BE ALONG A LINE
FROM KILLEEN TO WACO TO PARIS. FARTHER TO THE NORTHWEST OF THAT
LINE...SOME DRIER AIR BEGINS TO WORK IN ACROSS THE NORTHWEST
COUNTIES. ALL THAT BEING SAID...WILL HAVE SOME 20/30 POPS ACROSS
THE REGION THROUGH THIS AFTERNOON.

THE TROUGH SHIFTS EAST AND SOUTH LATER TONIGHT THEN BACK TO THE
WEST ON MONDAY. THIS SHOULD BRING RAIN CHANCES BACK DOWN BY
TOMORROW AFTERNOON. MOST OF NEXT WEEK SHOULD BE DRY AND WARMER
THAN TODAY AS RIDGING BUILDS BACK TO THE WEST. THE RIDGE NEVER
REALLY BUILDS IN OVER TEXAS KEEPING TEMPERATURES NEAR NORMAL FOR
THIS TIME OF YEAR. THERE ARE STILL INDICATIONS THAT NEXT WEEKEND
WE COULD SEE AN ACTUAL COLD FRONT SLIDE INTO THE REGION. WHILE IT
WOULDN'T MEAN MUCH COOLER TEMPERATURES...RAIN CHANCES WOULD
LIKELY INCREASE ALONG THE FRONT.

DUNN

&&

.PRELIMINARY POINT TEMPS/POPS...
DALLAS-FT. WORTH, TX  88  75  93  75  93 /  50  10   5   5   5
WACO, TX              89  75  92  74  91 /  30  10   5   5   5
PARIS, TX             88  72  92  73  92 / 100  10   5   5   5
DENTON, TX            88  74  92  73  93 /  50  10   5   5   5
MCKINNEY, TX          87  74  92  73  92 /  90  10   5   5   5
DALLAS, TX            89  76  94  76  94 /  50  10   5   5   5
TERRELL, TX           87  75  92  75  92 /  50  10   5   5   5
CORSICANA, TX         88  74  92  73  91 /  30  10   5   5   5
TEMPLE, TX            89  72  91  71  90 /  30  10   5   5   5
MINERAL WELLS, TX     89  71  92  71  92 /  20  10   5   5   5

&&

.FWD WATCHES/WARNINGS/ADVISORIES...
FLASH FLOOD WATCH UNTIL 4 PM CDT THIS AFTERNOON FOR TXZ093>095-
104>107.

&&

14/82

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
928 AM CDT SUN JUN 21 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0915 AM     FLASH FLOOD      ROYSE CITY              32.98N  96.33W
06/21/2015                   ROCKWALL           TX   LAW ENFORCEMENT

            SERVICE ROADS ALONG I-30 IN ROYSE CITY ARE CLOSED.
            FLOODING IS ALSO OCCURRING ON FMS 552 & 1141. CAMP CREEK
            ROAD IS FLOODED

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
933 AM CDT SUN JUN 21 2015

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0929 AM     FLASH FLOOD      LAVON                   33.03N  96.43W
06/21/2015                   COLLIN             TX   LAW ENFORCEMENT

            BUSINESS 78 NEAR HIGHWAY 78 IS CLOSED DUE TO FLOODING.
            SEVERAL COUNTY ROADS ARE ALSO FLOODED