Severe Thunderstorm Warning 122, NWS Fort Worth, TX

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
1221 AM CDT WED APR 20 2016

.AVIATION...
/06Z TAFS/

EARLIER 00Z TAF TRENDS WITH WEAKENING CONVECTIVE COMPLEX TIMING
STILL LOOKS GOOD. ESE WINDS WILL PREVAIL AT DFW UNTIL BETWEEN 08Z
AND 12Z...WHEN N/NW OUTFLOW WINDS UP TO 10 KTS WILL OCCUR WITH
TSRA MOVING THROUGH AND CIGS DROPPING INTO MVFR LEVELS. AS
SHORTWAVE AND ASSOCIATED COMPLEX MOVE INTO CENTRAL TEXAS BY
SUNRISE...A FEW SHRA WILL LINGER THROUGH MID MORNING BEFORE
SLOWING VFR CONDITIONS RETURN WITH LIGHT N/NE FLOW AROUND 5 KTS
BECOME SOUTHERLY BY 00Z WED AND AFTER.

AT WACO...SIMILAR TRENDS...JUST DELAYED 1-2 HOURS. CONFIDENCE ON
MVFR CIGS AND DURATION ARE NOT HIGH WITH ALL THE MIXING GOING ON
FROM LIFT AND CONVECTION. HOWEVER...WE ARE FAIRLY CONFIDENT ON
TIMING OF TSRA.

05/

&&

.UPDATE...
HAVE UPDATED FORECAST TO INCLUDE SEVERE TSTORM WATCH 98 THROUGH 3
A.M FOR AREAS JUST WEST-NORTH OF DFW. CLUSTERS OF STRONG-SEVERE
STORMS ARE NOW MOVING INTO OUR FAR NW COUNTIES. THIS ACTIVITY WILL
LIKELY MORPH INTO A SQUALL LINE OVERNIGHT AND INTO THE EARLY
MORNING HRS. INSTABILITY DOES TEND TO BE LESS SOUTHEAST OF THE
WATCH AREA...BUT ISOLATED SEVERE WINDS AND HAIL CANNOT BE RULED
OUT THROUGH ABOUT SUNRISE ACROSS THE NORTHWEST HALF OF THE
AREA. THE LINEAR COMPLEX IS SHOWN TO WEAKEN AS IT MOVES INTO
CENTRAL TEXAS JUST BEFORE SUNRISE DUE TO VEERING AND WEAKENING OF
THE NOCTURNAL LOW LEVEL JET. WATCH AND UPDATED FORECAST ALREADY
ISSUED.

05/

&&

.PREV DISCUSSION... /ISSUED 352 PM CDT TUE APR 19 2016/
AFTERNOON WATER VAPOR IMAGERY SHOWS A LARGE UPPER LOW SPINNING
OVER THE WESTERN U.S. THE NEXT EMBEDDED SHORTWAVE ROTATING AROUND
THE LOW IS SWINGING THROUGH NEW MEXICO AND INTO WEST TEXAS AT THIS
HOUR. THIS IS SPREADING A BROAD AREA OF ASCENT ACROSS THE TEXAS
PANHANDLE AND INTO WESTERN OKLAHOMA. AT THE SURFACE...A WEAK
FRONTAL BOUNDARY IS LOCATED ACROSS THE PANHANDLE WHERE SCATTERED
THUNDERSTORMS HAVE DEVELOPED AIDED BY THE FORCING ALOFT.

ACROSS NORTH TEXAS...THINGS REMAIN QUIET FOR THE TIME BEING.
SURFACE WINDS HAVE BEEN LIGHT WITH ONLY WEAK LOW LEVEL CONVERGENCE
NOTED IN THE WIND FIELDS. SOME BREAKS IN THE CLOUDS HAVE OCCURRED
MAINLY EAST OF INTERSTATE 35 BUT A GENERAL LACK OF FOCUS FOR ANY
CONVECTION HAS LEFT THE AREA PRECIPITATION FREE THIS AFTERNOON.

AS WE HEAD INTO THIS EVENING...THE EASTWARD MOVING TROUGH WILL
SPREAD ASCENT INTO NORTH TEXAS. LATEST OBJECTIVE SURFACE ANALYSIS
ACROSS NORTH TEXAS INDICATES TEMPERATURES IN THE MID 70S WITH
DEWPOINTS IN THE MID 60S ACROSS OUR SOUTHEAST COUNTIES. THIS
YIELDS SURFACE BASED INSTABILITY OF 1000-1500 J/KG. THIS
INSTABILITY HAS SLOWLY BEEN CREEPING NORTHWARD THROUGH THE DAY
MOSTLY IN RESPONSE TO HEATING BUT ALSO AS BETTER LOW LEVEL
MOISTURE GETS PULLED NORTHWARD. WEAK SURFACE PRESSURE FALLS NOTED
OVER THE LAST FEW HOURS IN RESPONSE TO THE APPROACHING TROUGH
SHOULD ALLOW SLIGHTLY STRONGER EAST-SOUTHEAST FLOW TO BECOME
ESTABLISHED ACROSS NORTH TEXAS THIS EVENING. THIS SHOULD RESULT IN
DEWPOINTS AND SURFACE BASED INSTABILITY INCREASING THROUGH LATE
TONIGHT. LATEST HIGH-RESOLUTION CONVECTION-ALLOWING MODELS CONGEAL
THE CLUSTER OF SHOWERS AND THUNDERSTORMS ACROSS WEST TEXAS INTO A
SMALL COMPLEX LATE TONIGHT AND MOVE IT SOUTHEAST INTO NORTH TEXAS
PRIOR TO MIDNIGHT. GIVEN THE RUN TO RUN CONSISTENCY BETWEEN THE
HIGH-RES GUIDANCE AND THE FACT THAT THE ATMOSPHERE SHOULD REMAIN
UNDISTURBED THROUGH THE EVENING HOURS...HAVE RAISED POPS
SUBSTANTIALLY THROUGH THE OVERNIGHT HOURS.

CONCERNING SEVERE POTENTIAL TONIGHT...
THINK WIDESPREAD SEVERE POTENTIAL IS LOW...HOWEVER THERE ARE SOME
CONCERNS. RIGHT NOW THE LOW LEVEL WIND SHEAR PROFILE IS
WEAK...HOWEVER AS WE GET INTO THE LATE EVENING HOURS THE 850MB
FLOW IS EXPECTED TO STRENGTHEN TO 25 TO 30 KT AND NEAR SURFACE
WINDS WILL BACK AND INCREASE AHEAD OF THE LINE OF CONVECTION. RAP
SOUNDINGS INDICATE THAT LOW LEVEL HODOGRAPHS WILL CURVE AND
ENLARGE THROUGH THE LOWEST 2KM RIGHT AROUND MIDNIGHT. NORMALLY
THIS TIME OF NIGHT WOULD NOT BE A BIG CONCERN FOR SEVERE WEATHER
AS SURFACE BASED INSTABILITY WOULD BE LIMITED OR UNAVAILABLE DUE
TO INCREASING INHIBITION. HOWEVER TONIGHT...MOST OF NORTH TEXAS
SHOULD REMAIN UNCAPPED AS THE LINE APPROACHES. THIS SHOULD ALLOW
THE LINE OF STORMS TO CONTINUE INTO THE AXIS OF INSTABILITY...
BEING ASSISTED BY FORCING FROM THE UPPER TROUGH. IT ALSO SHOULD
SUPPORT SURFACE BASED PARCELS BEING LIFTED ALONG THE LEADING EDGE
OF THE LINE. IF THAT IS THE CASE AND THE CONVECTION IS SURFACE
BASED...THERE WOULD BE A LOCALIZED WIND DAMAGE AND ISOLATED
TORNADO THREAT WITH ANY BOWING LINE SEGMENTS. THE OVERALL HAIL
THREAT APPEARS LOW...ALTHOUGH ANY ISOLATED CONVECTION THAT
DEVELOPS AHEAD OF THE LINE...ESPECIALLY WEST OF I-35 COULD PRODUCE
HAIL.

CONCERNING FLOODING POTENTIAL TONIGHT...
THE LINE OF STORMS SHOULD MOVE THROUGH RATHER QUICKLY...WITH ONLY
LIMITED POTENTIAL FOR FLOODING IN ANY GIVEN AREA. ANY ADDITIONAL
RAINFALL IN AREAS THAT HAVE EXPERIENCED FLOODING RECENTLY COULD
SEE SOME ADDITIONAL PROBLEMS BUT THINK THE OVERALL FLASH FLOOD
THREAT IS LOW SO WILL NOT ISSUE A WATCH AT THIS TIME.

THE LINE OF THUNDERSTORMS SHOULD CONTINUE TO THE SOUTHEAST THROUGH
THE MORNING HOURS ON WEDNESDAY. AFTER IT CLEARS OUR EAST/SOUTHEAST
COUNTIES...MOST OF NORTH TEXAS SHOULD REMAIN DRY THROUGH THE
AFTERNOON HOURS. ANOTHER SHORTWAVE DIVES SOUTH THROUGH THE PLAINS
TOMORROW NIGHT AND IT APPEARS THAT ONE FINAL COMPLEX OF
THUNDERSTORMS WILL MOVE THROUGH THE AREA LATE WEDNESDAY NIGHT INTO
THURSDAY. WE WILL CONTINUE TO ASSESS THE POTENTIAL FOR SEVERE
WEATHER DURING THIS TIME.

ONCE WE GET THROUGH THURSDAY...WE SHOULD HAVE A COUPLE OF DAYS OF
NICE WEATHER BEFORE THINGS RAMP UP AGAIN DURING THE LATTER HALF OF
THE WEEKEND AND THROUGH NEXT WEEK. THE UPPER PATTERN REMAINS
PROGRESSIVE AND THERE ARE INDICATIONS THAT WE WILL BE DEALING WITH
MULTIPLE DAYS OF DRYLINE CONVECTION THROUGH NEXT WEEK.

DUNN

&&

.PRELIMINARY POINT TEMPS/POPS...
DALLAS-FT. WORTH    63  77  57  79  57 /  50  60   5   0   0
WACO                62  77  57  78  55 /  40  50  10   0   0
PARIS               59  74  54  77  54 /  40  50   5   0   0
DENTON              59  74  54  77  55 /  60  60   5   0   0
MCKINNEY            59  75  54  77  54 /  50  60   5   0   0
DALLAS              64  77  58  79  58 /  50  60   5   0   0
TERRELL             63  76  56  78  55 /  40  60  10   0   0
CORSICANA           65  78  58  78  56 /  40  50  10   0   0
TEMPLE              64  78  58  78  56 /  40  50  20   0   0
MINERAL WELLS       59  76  53  77  53 /  60  60   5   0   0

&&

.FWD WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

05/05

HAZARDOUS WEATHER OUTLOOK...UPDATED
NATIONAL WEATHER SERVICE FORT WORTH TX
1016 PM CDT TUE APR 19 2016

TXZ091>095-100>107-115>123-129>135-141>148-156>162-174-175-201200-
MONTAGUE-COOKE-GRAYSON-FANNIN-LAMAR-YOUNG-JACK-WISE-DENTON-COLLIN-
HUNT-DELTA-HOPKINS-STEPHENS-PALO PINTO-PARKER-TARRANT-DALLAS-
ROCKWALL-KAUFMAN-VAN ZANDT-RAINS-EASTLAND-ERATH-HOOD-SOMERVELL-
JOHNSON-ELLIS-HENDERSON-COMANCHE-MILLS-HAMILTON-BOSQUE-HILL-NAVARRO-
FREESTONE-ANDERSON-LAMPASAS-CORYELL-BELL-MCLENNAN-FALLS-LIMESTONE-
LEON-MILAM-ROBERTSON-
1016 PM CDT TUE APR 19 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH AND CENTRAL TEXAS.

.DAY ONE...TONIGHT.
A LINE OF THUNDERSTORMS WILL MOVE PROGRESSIVELY SOUTHEAST ACROSS
NORTH-CENTRAL TEXAS OVERNIGHT. A FEW THUNDERSTORMS WILL BE SEVERE
WITH DAMAGING WINDS AND LARGE HAIL...ESPECIALLY WEST OF A LINE
FROM COMANCHE...TO GLEN ROSE...TO DECATUR...TO GAINESVILLE THROUGH
3 AM CDT. THOUGH A BRIEF TORNADO EMBEDDED WITHIN THE LINE CANNOT
BE RULED OUT...THE THREAT WILL BE LOW.

THE LINE OF STORMS WILL MOVE INTO CENTRAL TEXAS TOWARD SUNRISE
AND SHOULD GRADUALLY WEAKEN. HOWEVER...STRONG STORMS WITH SMALL
HAIL AND GUSTY WINDS WILL REMAIN POSSIBLE. DURATION OF RAINFALL
AT ANY ONE LOCATION SHOULD BE LIMITED AND PRECLUDE WIDESPREAD
FLOODING. HOWEVER...ANY ADDITIONAL RAINFALL MAY AGGRAVATE ONGOING
TRIBUTARY FLOODING CONCERNS ALONG THE BRAZOS AND TRINITY RIVER
BASINS.

.DAYS TWO THROUGH SEVEN...WEDNESDAY THROUGH MONDAY.
THE STORMS ONGOING AT DAYBREAK WEDNESDAY MORNING WILL AFFECT AREAS
MAINLY EAST OF THE I-35 CORRIDOR...ENDING BEFORE MIDDAY. DAMAGING
WINDS AND LOCALIZED FLOODING ISSUES WILL BE THE PRIMARY HAZARDS
WITH THE STORMS DURING THE MORNING HOURS.

SOME REDEVELOPMENT OF THUNDERSTORMS WILL BE POSSIBLE WEDNESDAY
AFTERNOON IN AREAS GENERALLY SOUTH OF THE I-20 CORRIDOR. THESE
STORMS COULD BECOME SEVERE...WITH DAMAGING WINDS AND LARGE HAIL.

ANOTHER ROUND OF STORMS IS EXPECTED TO DEVELOP NORTHWEST OF THE
REGION LATE WEDNESDAY AND MOVE SOUTHEAST ACROSS THE AREA WEDNESDAY
NIGHT INTO THURSDAY MORNING. A FEW SEVERE STORMS WILL BE POSSIBLE
WITH THIS ACTIVITY AS WELL...ALONG WITH ADDITIONAL HEAVY RAIN.

AFTER A FEW QUIET DAYS FRIDAY AND SATURDAY...THUNDERSTORM CHANCES
WILL RETURN TO THE AREA ON SUNDAY AND MONDAY.

.SPOTTER INFORMATION STATEMENT...
SPOTTER ACTIVATION MAY BE REQUESTED DURING THE OVERNIGHT
HOURS...ESPECIALLY WEST OF A LINE FROM COMANCHE...TO GLEN
ROSE...TO DECATUR...TO GAINESVILLE THROUGH 3 AM CDT.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
114 AM CDT WED APR 20 2016

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

1210 AM     TSTM WND GST     VALLEY VIEW             33.48N  97.17W
04/20/2016  M60 MPH          COOKE              TX   TRAINED SPOTTER

            60 MPH WINDS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
117 AM CDT WED APR 20 2016

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

1210 AM     HAIL             VALLEY VIEW             33.48N  97.17W
04/20/2016  E1.00 INCH       COOKE              TX   TRAINED SPOTTER

            JUST EAST OF I-35 IN VALLEY VIEW

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE FORT WORTH TX
137 AM CDT WED APR 20 2016

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

1205 AM     TSTM WND DMG     VALLEY VIEW             33.48N  97.17W
04/20/2016                   COOKE              TX   EMERGENCY MNGR

            NUMEROUS TREES AND POWER LINES DOWN NEAR I-35 AND FM922.
            SOME TREES ON  HOMES, SOME BLOCKING ROADS. WINDS EST
            60 MPH.

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
143 AM CDT WED APR 20 2016

TXZ117-118-200730-
PARKER TX-TARRANT TX-
143 AM CDT WED APR 20 2016

...SIGNIFICANT WEATHER ADVISORY FOR EASTERN PARKER AND TARRANT
COUNTIES UNTIL 230 AM CDT...

AT 142 AM CDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG
A LINE EXTENDING FROM RENO TO NEAR LAKESIDE TO 8 MILES NORTH OF
GODLEY. MOVEMENT WAS EAST AT 40 MPH.

WIND GUSTS OF 50 TO 55 MPH AND PEA SIZED HAIL WILL BE POSSIBLE WITH
THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
FORT WORTH...ARLINGTON...GRAND PRAIRIE...MANSFIELD...EULESS...BEDFORD...
GRAPEVINE...HALTOM CITY...KELLER...COPPELL...HURST...BURLESON...SOUTHLAKE...
WEATHERFORD...WATAUGA...COLLEYVILLE...BENBROOK...SAGINAW...WHITE
SETTLEMENT AND CROWLEY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY LEAD TO
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS. THE HEAVY RAIN IS ALSO REDUCING VISIBILITIES FOR DRIVERS.

THESE STORMS MAY INTENSIFY...SO CLOSELY MONITOR FOR ADDITIONAL
INFORMATION OR POSSIBLE WARNINGS FROM THE NATIONAL WEATHER SERVICE.

&&

LAT...LON 3298 9703 3255 9704 3256 9772 3300 9773
TIME...MOT...LOC 0642Z 265DEG 36KT 3297 9759 3277 9754 3257 9756

JLDUNN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
215 AM CDT WED APR 20 2016

TXZ141-200745-
COMANCHE TX-
215 AM CDT WED APR 20 2016

...SIGNIFICANT WEATHER ADVISORY FOR WESTERN COMANCHE COUNTY UNTIL 245
AM CDT...

AT 214 AM CDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM OVER
MAY...OR 17 MILES NORTH OF EARLY...MOVING EAST AT 35 MPH.

NICKEL SIZE HAIL AND WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
COMANCHE...DE LEON AND GORMAN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL IS ALSO OCCURRING WITH THIS STORM...AND MAY LEAD TO
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3208 9892 3223 9862 3188 9837 3177 9872
TIME...MOT...LOC 0714Z 275DEG 28KT 3199 9890

JLDUNN

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE FORT WORTH TX
230 AM CDT WED APR 20 2016

TXZ133-145-200830-
JOHNSON TX-HILL TX-
230 AM CDT WED APR 20 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN JOHNSON AND HILL
COUNTIES UNTIL 330 AM CDT...

AT 230 AM CDT...DOPPLER RADAR WAS TRACKING STRONG THUNDERSTORMS ALONG
A LINE EXTENDING FROM NEAR VENUS TO NEAR WHITNEY. MOVEMENT WAS EAST
AT 25 MPH.

WIND GUSTS UP TO 50 MPH WILL BE POSSIBLE WITH THESE STORMS.

LOCATIONS IMPACTED INCLUDE...
HILLSBORO...WHITNEY...ITASCA...GRANDVIEW...COVINGTON...BYNUM...CARL'S
CORNER...ABBOTT...MALONE...PENELOPE AND MERTENS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

HEAVY RAINFALL IS ALSO OCCURRING WITH THESE STORMS...AND MAY LEAD TO
LOCALIZED FLOODING. DO NOT DRIVE YOUR VEHICLE THROUGH FLOODED
ROADWAYS.

&&

LAT...LON 3173 9695 3186 9704 3183 9711 3200 9741
      3243 9718 3228 9709 3226 9708 3205 9694
      3207 9689 3205 9688 3172 9693
TIME...MOT...LOC 0730Z 266DEG 23KT 3238 9714 3200 9737

JLDUNN