Area Forecast Discussion
Issued by NWS Dallas/Fort Worth, TX

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000
FXUS64 KFWD 241813
AFDFWD

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FORT WORTH TX
113 PM CDT THU APR 24 2014

.AVIATION...

FOR THE 18Z TAFS...A FRONT ON TOP OF THE METROPLEX AT THE
BEGINNING OF THE FORECAST PERIOD IS THE PRIMARY FORECAST CONCERN
OVER THE NEXT 24 TO 36 HOURS.

A COLD FRONT WAS MORE OR LESS ON TOP OF KDAL AT THE TIME OF THIS
DISCUSSION. MOST OF THE METROPLEX AREA TAF SITES WERE BEHIND THE
FRONT ALREADY...WITH WEST-NORTHWEST WINDS OF 20 TO 25 MPH AND SOME
SLIGHTLY REDUCED VISIBILITIES IN BLOWING DUST. REDUCED
VISIBILITIES IN BLOWING DUST WERE HOVERING JUST ABOVE MVFR
LEVELS...SO IN GENERAL VFR CONDITIONS ARE EXPECTED DURING THE
VALID FORECAST PERIOD FOR THE DFW AREA TAFS.

BREEZY NORTHWESTERLY WINDS WILL BECOME LIGHT AFTER SUNSET...AND
REMAIN LIGHT AND NORTHERLY FOR MUCH OF THE OVERNIGHT HOURS. LIGHT
NORTHERLY WINDS ARE EXPECTED TO BECOME SOUTHERLY JUST BEFORE
SUNRISE AS HIGH PRESSURE SLIDES EAST OF NORTH TEXAS. SOUTH WINDS
AND CLEAR SKIES WILL PREVAIL DURING THE DAY ON FRIDAY.

CAVANAUGH

&&

.UPDATE...
WILL UPDATE TO RAISE POPS A BIT IN THE FAR EASTERN COUNTIES FOR
THE REMAINDER OF THE MORNING. BOUNDARY MOVING THROUGH THE AREA ON
RADAR IS A GRAVITY WAVE WHICH IS CONFIRMED BY SEVERAL HIGH
RESOLUTION BAROMETRIC PRESSURE SENSORS SHOWING A CLASSIC RAPID
RISE/FALL SIGNATURE WITH A PERIOD OF ABOUT 10 TO 15 MINUTES. WHILE
GRAVITY WAVES THEMSELVES PROPAGATE THROUGH A STABLE MEDIUM /SEE
STRONGLY CAPPED FWD SOUNDING/...THE CRESTS OF THE WAVE ARE ACTUALLY
AREAS OF UPWARD VERTICAL MOTION. IN AREAS OF WHERE MOISTURE IS
LOCATED...THESE CRESTS CAN LIFT THE MOISTURE TO ITS LFC AND
ELEVATED THUNDERSTORMS CAN DEVELOP. THIS APPEARS TO BE HAPPENING
ACROSS THE EASTERN PARTS OF THE CWA. WHILE WIDESPREAD INTENSE
CONVECTION IS NOT EXPECTED...STEEP LAPSE RATES TO EXIST AND THE
STRONGEST CELLS COULD PRODUCE SOME HAIL. WILL RAISE POPS TO 20-30
PERCENT ACROSS THE EAST FOR THE REMAINDER OF THE MORNING.

FARTHER NORTHWEST...A COLD FRONT IS ENTERING THE NORTHWEST
COUNTIES WITH STRONG NORTHWEST WINDS BEHIND IT. SATELLITE IMAGERY
DOES SHOW A FINE LINE OF CLOUDS DEVELOPING ALONG THE LEADING EDGE
OF FORCING. AT THIS TIME...DONT THINK ANY ADDITIONAL THUNDERSTORMS
WILL DEVELOP...BUT WILL CONTINUE TO MONITOR THROUGH THE MORNING.
NO OTHER CHANGES NEEDED AT THIS TIME.

DUNN

&&

.PREV DISCUSSION... /ISSUED 339 AM CDT THU APR 24 2014/
MOST OF THE EVENING CONVECTION HAS EXITED THE CWA INTO OKLAHOMA.
MID-LEVEL MOISTURE IS NOT AS HIGH AS ANTICIPATED AND THUS THE
ELEVATED CONVECTION THAT WAS PREVIOUSLY EXPECTED FOR THE OVERNIGHT
HOURS IS LESS LIKELY. WE HAVE SEEN A COUPLE OF WEAK SHOWERS TRY TO
DEVELOP BUT THEY QUICKLY DISSIPATED DUE TO THE MOISTURE PROBLEMS.
HOWEVER...STEEP MID-LEVEL LAPSE RATES COULD LEAD TO A STRONG
STORM IF SOMETHING DOES FIRE. MODEL SOUNDINGS SHOW FURTHER DRYING
OF THE MID-LEVELS AFTER 12Z AND TODAY SHOULD BE MOSTLY DRY ACROSS
MUCH OF THE CWA.

A STRONG SURFACE LOW EXTENDS FROM NW OKLAHOMA INTO NE KANSAS. THIS
LOW SHOULD QUICKLY MOVE EAST...AND AS IT DOES A COLD FRONT WILL BE
ABLE TO SURGE SOUTHWARD ON THE BACKSIDE OF THE LOW. THE FRONT IS
EXPECTED TO REACH OUR NORTHWESTERN ZONES AROUND MID-MORNING AND
THEN SHOULD REACH THE SOUTHERN CWA BORDER AROUND LATE-AFTERNOON.
THIS FRONT WILL HAVE A LITTLE EFFECT ON TEMPERATURES...WITH HIGHS
TODAY ABOUT 5 DEGREES COOLER THAN YESTERDAY. HIGH-RES MODEL
GUIDANCE IS SHOWING ISOLATED SHOWER AND STORM ACTIVITY ALONG THE
FRONT LATE THIS AFTERNOON. THIS HAS BEEN CONSISTENTLY FORECASTED
BY THE GUIDANCE...BUT THE FRONT IS EXPECTED TO PUSH FARTHER SOUTH
THAN THOUGHT. THIS SHOULD ALLOW FOR MOST ACTIVITY TO BE SOUTH OF
THE CWA. NEVERTHELESS WILL HOLD ONTO 20 POPS ACROSS THE SOUTHERN
ZONES FOR ANY SHOWERS AND STORMS THAT DEVELOP ALONG THE FRONT THIS
AFTERNOON. CAPE VALUES WILL BE QUITE HIGH TODAY....SO THERE IS THE
POTENTIAL FOR ANY STORMS THAT DO DEVELOP TO BECOME SEVERE. THIS
POTENTIAL MATCHES WELL WITH THE 5 PERCENT SEVERE HAIL/WIND
PROBABILITIES ON THE DAY 1 OUTLOOK.

SOUTHERLY WINDS RETURN ON FRIDAY IN RESPONSE TO THE NEXT
APPROACHING SYSTEM AND HIGH TEMPERATURES WILL BE BACK IN THE
MIDDLE TO UPPER 80S ACROSS NORTH TEXAS. THIS UPPER LOW IS EXPECTED
TO BE MUCH STRONGER THAN THE CURRENT ONE. THE CURRENT FORECASTED
TRACK IS TO OUR NORTH...BUT THERE WILL STILL BE PLENTY OF LIFT
ACROSS THE CWA SATURDAY NIGHT THROUGH SUNDAY NIGHT. SATURDAY
SHOULD BE MOSTLY QUIET DUE TO A STRONG CAPPING INVERSION THAT IS
EXPECTED TO BE IN PLACE. THE DRYLINE SATURDAY AFTERNOON IS
FORECASTED TO BE ABOUT 2 COUNTIES WEST OF OUR WESTERN BOUNDARY.
SEVERE STORMS ARE EXPECTED TO DEVELOP ALONG THE DRYLINE DURING THE
LATE AFTERNOON HOURS AND STORM MOTIONS WOULD THEN TAKE THEM INTO
OUR WESTERN COUNTIES AFTER 00Z. HAIL AND DAMAGING WINDS WOULD BE
THE MAIN THREATS...BUT AS STORMS ENTER OUR CWA...DEWPOINTS IN THE
MID-60S AND SHEAR PROFILES WOULD SUPPORT AN ISOLATED TORNADO
THREAT. SURFACE BASED CONVECTION SHOULD WEAKEN AFTER 3Z AS THE
BOUNDARY LAYER DECOUPLES...BUT CONTINUED LIFT AND ELEVATED
INSTABILITY WILL CONTINUE THE RAIN CHANCES AS ELEVATED SHOWERS AND
THUNDERSTORMS REMAIN POSSIBLE.

AS THE UPPER LOW NEARS NORTH TEXAS SUNDAY...THE DRYLINE WILL BE
ABLE TO SURGE EASTWARD. THERE REMAINS SOME DISCREPANCIES BETWEEN
THE MODEL GUIDANCE ON HOW FAR EAST THE DRYLINE WILL GO...BUT THE
GENERAL CONSENSUS IS NEAR THE I-35 CORRIDOR. STORMS WILL BE
POSSIBLE TO THE EAST OF THE DRYLINE...AND SURFACE BASED CONVECTION
IS EXPECTED ONCE THE CAP ERODES IN THE AFTERNOON. SEVERE WEATHER
WILL ONCE AGAIN BE POSSIBLE...AS CAPE AND SHEAR VALUES SUPPORT
ROTATING STORMS. HOWEVER...POOR LOW-LEVEL LAPSE RATES ARE LIMITING
HIGHER CAPE VALUES AND VEERING WINDS AHEAD OF THE DRYLINE SHOULD
LIMIT THE DIRECTIONAL SHEAR. THEREFORE...HAIL AND DAMAGING WINDS
WILL ONCE AGAIN BE THE MAIN THREAT. CANT RULE OUT ISOLATED
TORNADOES...BUT THE BEST TIMING WOULD BE BEFORE 3 PM...BEFORE LOW-
LEVEL WINDS BEGIN TO VEER AND ONLY UNI-DIRECTIONAL SHEAR IS IN PLACE.

THE ASSOCIATED COLD FRONT IS NOT EXPECTED UNTIL TUESDAY MORNING AS
THE UPPER LOW STALLS TO OUR NORTH AS IT GETS CAUGHT IN A BLOCKING
PATTERN. MOST MEDIUM RANGE GUIDANCE KEEPS THE LOW TO OUR NORTHEAST
THROUGH FRIDAY. THE PERSISTENT NORTHERLY FLOW AND ADDITIONAL SURGE
OF COOLER AIR WILL KEEP TEMPERATURES BELOW NORMAL NEXT WEEK.

HAMPSHIRE



&&


.PRELIMINARY POINT TEMPS/POPS...
DALLAS-FT. WORTH, TX  81  59  84  62  84 /  10   0   0   5   0
WACO, TX              83  54  83  64  83 /  10   5   0   0   0
PARIS, TX             79  54  82  58  82 /  10   5   0   0   0
DENTON, TX            82  49  84  61  84 /  10   0   0   5   5
MCKINNEY, TX          81  51  83  59  81 /  10   0   0   5   0
DALLAS, TX            82  59  85  62  84 /  10   0   0   5   0
TERRELL, TX           80  54  82  59  84 /  20   0   0   5   0
CORSICANA, TX         81  57  83  61  85 /  20   5   0   0   0
TEMPLE, TX            85  57  84  64  82 /  10   5   0   0   0
MINERAL WELLS, TX     81  53  85  63  86 /  10   0   5   5  10

&&

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

&&

$$





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