266
FXUS64 KAMA 172048
AFDAMA
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
248 PM CST SUN NOV 17 2024
..NEW SHORT TERM, LONG TERM
KEY MESSAGES
ISSUED AT 342 AM CST SUN NOV 17 2024
HEAVY RAINFALL THAT COULD LEAD TO FLOODING WILL START THIS
EVENING AND CONTINUE WELL INTO MONDAY.
COLDER TEMPERATURES WILL OCCUR BEHIND A COLD FRONT TUESDAY INTO
WEDNESDAY AND A WIDESPREAD FREEZE WILL OCCUR WEDNESDAY MORNING.
SHORT TERM
(THIS EVENING THROUGH MONDAY NIGHT)
ISSUED AT 245 PM CST SUN NOV 17 2024
IMPRESSIVE MID-UPR LEVEL STORM SYSTEM HAS BOTTOMED OUT IN NRN
MEXICO AND IS POISED TO MAKE ITS TURN NE BEFORE MAKING A BEELINE
TO THE PANHANDLES. MODEL Q-VECTOR CONVERGENCE SHOWS BETTER LIFT
ARRIVING AROUND 00 UTC MONDAY ACROSS THE WEST, BUT THE GREATEST
LIFT ASSOCIATED WITH THE STORM WILL OCCUR BETWEEN 6 UTC AND 18
UTC AND THIS IS WHEN MOST OF THE PRECIPITATION WILL OCCUR WITH
THIS EVENT. MODELS HAVE COME INTO AGREEMENT WRT TRACK AND STRENGTH
OF THE UPPER LOW (WHICH MEANS THE GFS HAD TO TREND BACK N/W TO
THE MEAN SOLUTION).
WITH MODEL SETTLING ON A FAVORABLE TRACK ACROSS THE AREA THAT
MAXIMIZES LIFT AND MOISTURE TRANSPORT, QPF HAS INCREASED
SLIGHTLY. THE NBM HAS SIGNIFICANTLY INCREASED PROBABILITY OF 3 OR
MORE INCHES AND NOW SHOWS A 10 TO 50 PERCENT CHANCE OF OCCURRENCE
EAST OF A LINE FROM FRIONA TO CANYON TO SPEARMAN TO BEAVER WITH
HIGHEST PROBABILITIES ALONG AN AXIS FROM PAMPA TO CANADIAN AND
HIGGINS. THAT SAID, THERE ARE STILL SOME SIGNIFICANT MODEL
DIFFERENCES WRT WHERE THE HIGHEST RAINFALL WILL OCCUR. THIS SEEMS
TO BE RELATED TO THE POSITION OF THE AREA OF H85 CONVERGENCE
ASSOCIATED WITH STRONG FRONTOGENESIS THAT DEVELOPS AS THE LOW
APPROACHES AS THIS FEATURE SEEMS ALIGNED WITH HIGHER QPF IN ALL
MODELS. SO, THE MODELS MOST AGRESSIVE WITH PRODUCING HIGHER QPF
FURTHER WEST, DO SO BECAUSE THEY REALLY PULL THIS FEATURE WELL
WEST OF WHERE THE CURRENT FRONTAL BOUNDARY IS LOCATED ACROSS THE
FAR SE TEXAS PANHANDLE AS THE LOW APPROACHES. THE STRONGEST LIFT
ASSOCIATED WITH THE LOW BASED ON THE TRACK ACTUALLY IS ACROSS THE
WEST WHICH BETTER ALIGNS THOSE FEATURES. MODELS IN THE FURTHER
EAST CAMP WRT HIGHEST QPF ONLY SLIGHTLY PULL THIS FEATURE BACK TO
THE NW AS THE LOW APPROACHES. THE ICON PROVIDES A 3RD SOLUTION
WHICH CREATES 2 SEPARATE ZONES OF HIGHER QPF, ONE IN THE SE
(FRONTOGENESIS AREA?) AND ONE ACROSS THE WEST (STRONGER LIFT?).
THE CURRENT QPF FORECAST IS A COMPROMISE THAT IS IN GOOD AGREEMENT
WITH THE AXIS OF HIGHEST 3" PROBABILITY.
AS WE HAVE SEEN WITH THE PAST FEW SYSTEMS, THE RAIN RATES WILL
NOT REACH LEVELS OF SPRING/SUMMER STORMS AND HREF PROBABILITIES
OF SEEING RATES OF 1 INCH PER HOUR OR GREAT ARE ONLY 10-30
PERCENT. THIS WILL HELP MITIGATE THE FLASH FLOOD THREAT SOME. THAT
SAID, THE SHEAR VOLUME OF WATER HERE CAN BECOME A PROBLEM AND WE
EXPECT STREAMS AND RIVERS TO SEE RISES AND THERE CERTAINLY COULD
BE SOME FLOODING OF LOW LYING AREAS, COUNTY AND FARM ROADS, ETC.
STREAMS, CREEKS AND RIVERS WILL ALSO SEE RISES AS ALL THIS WATER
DRAINS OFF AND SEVERAL RIVER FORECASTS POINTS SHOULD AT LEAST
REACH ACTION STAGE. BASED ON THE QPF TRENDS, WE HAVE ADDED RANDALL
(MAINLY FOR THE FAR EASTERN/SOUTHERN AREAS), HUTCHINSON,
OCHILTREE AND BEAVER COUNTIES TO THE FLOOD WATCH.
GITTINGER
LONG TERM
(TUESDAY THROUGH NEXT SATURDAY)
ISSUED AT 245 PM CST SUN NOV 17 2024
FEWER AND FEWER MODELS AND ENSEMBLE MEMBERS SHOWN A STRONG ENOUGH
SECONDARY DISTURBANCE TUE/WED TO PRODUCE ANY SIGNIFICANT
PRECIPITATION EARLY IN THE PERIOD (TUE/WED) AND NBM PROBABILITIES
HAVE DROPPED TO AROUND 5%. IF ANYTHING, OPERATIONAL MODELS HAVE
BACKED OFF SLIGHTLY ON THE COLD AIR BEHIND THE TUESDAY FRONT. H85
TEMPS ARE NOW FORECAST BY ALL THE 12Z OPERATIONAL MODELS TO BE
1-3 DEG C RATHER THAN BELOW FREEZING. THAT SAID, WITH LIGHT WINDS
WED MORNING GIVEN SFC HIGH PRESSURE NEAR THE REGION SHOULD STILL
ALLOW FOR ENOUGH RADIATIONAL COOLING FOR A WIDESPREAD FREEZE FOR
MOST IF NOT THE ENTIRE REGION WITH A HARD FREEZE FOR A SIGNIFICANT
PORTION OF THE AREA, ALTHOUGH IT HAS BEEN NOTED THE NBM
PROBABILITIES FOR BELOW 28 DEG LOWS WED MORNING HAVE DECREASED
SLIGHTLY. THESE PROBABILITIES ARE NOW DOWN AROUND 20-40 PERCENT
SURROUNDING AMARILLO AND THE HIGHEST PROBABILITIES GREATER THAN 70%
ARE NOW CONFINED TO THE NW 3RD OF THE PANHANDLES.
NOT MUCH TO WRITE HOME ABOUT WRT WEATHER THE REMAINDER OF THE
PERIOD AS THE NEXT SYSTEMS WILL BE MUCH MORE PROGRESSIVE AND
FURTHER NORTH. WINDS WILL BE ALL OVER THE MAP GIVEN REINFORCING
FRONT INDICATED BY MODELS THURSDAY AND THE NEXT WAVE CROSSING THE
PLAINS MAY BRING THE NEXT FRONT BY SUNDAY. AFTER WEDNESDAY,
TEMPERATURES ARE FORECAST TO WARM SLIGHTLY AND BE VERY CLOSE TO
AVERAGE (LOWS 30S / HIGHS LOW 60S) WITH A TREND TOWARD SLIGHTLY
ABOVE AVERAGE TOWARD THE END OF THE PERIOD.
GITTINGER
AVIATION
(18Z TAFS)
ISSUED AT 1152 AM CST SUN NOV 17 2024
ROBUST STORM SYSTEM WILL BRING WIDESPREAD PRECIPITATION EVENT TO
THE AREA THIS EVENING, THROUGH THE OVERNIGHT HOURS AND MUCH OF
MONDAY. EMBEDDED THUNDERSTORMS ARE ALSO EXPECTED AND ARE POSSIBLE
FOR ANY OF THE SITES, BUT THE HIGHEST PROBABILITY FOR LIGHTING
WILL BE ACROSS THE SOUTHEAST TX PANHANDLE. PROBABILITIES OF STORMS
WRT TAF SITES IS HIGHEST IN AMARILLO AND HAVE INCLUDED MENTION
THERE DURING THE EARLY MORNING HOURS MONDAY WHEN PROBS ARE
HIGHEST. OUTSIDE OF THIS, WILL ADJUST WITH AMENDMENTS AS NEEDED.
IFR CONDITIONS WILL DEVELOP FROM SE TO NW AS WIDESPREAD RAIN
SPREADS ACROSS THE AREA DURING THE LATE EVENING AND WILL CONTINUE
THROUGH THE REMAINDER OF THE TAF PERIOD FOR AMA AND GUY, WHILE DHT
WILL IMPROVE TO MVFR LEVELS SLIGHTLY EARLIER.
PRELIMINARY POINT TEMPS/POPS
AMARILLO TX 44 57 36 56 / 100 70 0 0
BEAVER OK 43 53 32 52 / 100 90 0 0
BOISE CITY OK 36 51 27 47 / 90 80 0 0
BORGER TX 45 57 35 57 / 100 80 0 0
BOYS RANCH TX 43 60 33 57 / 100 90 0 0
CANYON TX 44 60 35 57 / 100 70 0 0
CLARENDON TX 48 60 39 59 / 100 40 0 0
DALHART TX 38 57 29 52 / 100 90 0 0
GUYMON OK 39 51 29 51 / 100 90 0 0
HEREFORD TX 44 61 36 59 / 100 80 0 0
LIPSCOMB TX 48 59 35 54 / 100 80 0 0
PAMPA TX 45 56 35 55 / 100 70 0 0
SHAMROCK TX 50 62 39 59 / 100 50 0 0
WELLINGTON TX 51 64 40 61 / 100 40 0 0
AMA WATCHES/WARNINGS/ADVISORIES
TX...FLOOD WATCH FROM 6 PM CST THIS EVENING THROUGH MONDAY MORNING
FOR TXZ004-005-008>010-013>015-017>020-317.
OK...FLOOD WATCH FROM 6 PM CST THIS EVENING THROUGH MONDAY MORNING
FOR OKZ003.
SHORT TERM...88
LONG TERM....88
AVIATION...88
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