Area Forecast Discussion
Issued by NWS Pueblo, CO

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FXUS65 KPUB 210312
AFDPUB

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PUEBLO CO
912 PM MDT SAT SEP 20 2014

.UPDATE...
ISSUED AT 852 PM MDT SAT SEP 20 2014

UPDATED TO MAKE A FEW ADJUSTMENTS FOR SHOWERS AND THUNDERSTORMS
ACROSS THE PLAINS THROUGH MIDNIGHT. CURRENT RADAR ANALYSIS SHOWS
SHOWER AND THUNDERSTORM ACTIVITY FROM THE CONTINENTAL
DIVIDE...NORTHEAST ACROSS TELLER AND EL PASO COUNTIES. THESE
STORMS HAVE BEEN VERY SLOW MOVING...AND THE STRONGER CELLS ARE
PUTTING DOWN BETWEEN ONE HALF AND ONE INCH OF RAINFALL. IF
STRONGER CELLS MOVE OVER BURN SCARS...THEY COULD PRODUCE FLASH
FLOODING AND THIS WILL NEED TO BE MONITORED. AS FAR AS THE
PLAINS...THE HIGH RES MODELS STILL DEVELOPING AN AREA OF SHOWERS
AND THUNDERSTORMS AROUND MIDNIGHT ALONG THE EASTERN MOUNTAINS AND
SPREADING EAST THROUGH SUNDAY MORNING.  MOZLEY

&&

.SHORT TERM...(THIS EVENING THROUGH SUNDAY)
ISSUED AT 245 PM MDT SAT SEP 20 2014

CURRENTLY...THE UPPER RIDGE OF HIGH PRESSURE REMAINED ACROSS THE
REGION...WHILE A CLOSED UPPER LOW WAS LOCATED OVER THE CENTRAL CA
COAST. THIS PATTERN WAS DRAWING MOISTURE UP INTO THE DESERT
SW...WITH A GOOD AMOUNT OF CONVECTION FIRING OVER NV AND SOUTHERN UT
AS OF 3 PM. ACROSS THE CWA...SFC OBS THROUGHOUT THE MORNING HAVE
SHOWN A FRONTAL BOUNDARY PUSHING THROUGH THE PLAINS PRODUCING GUSTY
NE-SE WINDS AT TIMES...BUT WITH LITTLE OTHER EFFECT. TEMPS THIS AFTN
HAVE BEEN ABOUT THE SAME AS HAVE BEEN RECORDED THE PAST TWO DAYS.

TONIGHT AND TOMORROW...OVER THE NEXT 24 HRS...MODELS INDICATE THAT
THE RIDGE PRESENTLY OVER THE REGION WILL START TO WEAKEN...WHILE THE
UPPER LOW OVER CA MOVES INLAND AND TRACKS TO THE NE INTO CENTRAL NV.
MOISTURE ADVECTION INTO WESTERN CO IS EXPECTED TO STRENGTHEN AS THE
LOW APPROACHES...BUT THE REAL STORY FOR THE SHORT TERM IS THE
CONTINUED PERSISTENT EASTERLY SFC FLOW THAT IS FORECAST FOR THE E
PLAINS AND MTS TONIGHT THROUGH TOMORROW. THOUGH THERE HAS BEEN A
VERY SLOW START TO ANY SORT OF PCPN OVER THE MTS...ALL THE MODELS
ARE STILL HANGING ONTO THE PROMISE OF SHOWERS AND ISOLATED STORMS
OVER THE MTS MOVING OFF ACROSS EL PASO COUNTY BY 02Z...THEN ACROSS
PUEBLO COUNTY AND AREAS EAST BETWEEN 06Z AND 09Z. THIS LLVL FLOW
WILL CONTINUE...SO KEPT ISOLATED POPS ALL AREAS EAST WHILE THE MTS
AND WESTERN AREAS GET INCREASED POPS TO REFLECT THE INCREASING
INCOMING MOISTURE. MODELS DO INDICATE THAT TOMORROW WILL BE THE
FIRST BREAK IN THE ABOVE NORMAL TEMPS...AS READINGS ARE FORECAST TO
WARM INTO THE 70S IN THE AFTN. MOORE

.LONG TERM...(SUNDAY NIGHT THROUGH SATURDAY)
ISSUED AT 245 PM MDT SAT SEP 20 2014

A FEW STRONG THUNDERSTORMS WILL BE POSSIBLE AT THE BEGINNING OF
THIS PERIOD...MONDAY...AS A TROUGH ALOFT MOVES ACROSS THE REGION
COMBINES WITH SOME INSTABILITY AND FAVORABLE SHEAR. AT THIS TIME
THE MOST FAVORABLE PARAMETERS APPEAR TO FAVORING THE GREATER I-25
CORRIDOR REGION. SPC HAS AREA MENTIONED FOR ENHANCED CONVECTION
FOR THIS DAY.

TUESDAY WILL LIKELY BE DRY ACROSS THE FCST AREA. NORTHWEST FLOW
WILL ADVECT DRIER AIR ALOFT INTO THE REGION...ALTHOUGH SOME
RESIDUAL LVL MOISTURE WILL STILL BE AROUND...ESPECIALLY OVER THE
FAR E PLAINS.

WEDNESDAY...A WEAK BOUNDARY IS FCST TO MOVE DOWN THE PLAINS THIS
DAY. THIS BOUNDARY WILL STALL DOWN ALONG THE RATON MESA...AND THIS
AREA...ALONG WITH THE S MTNS...IS WHERE THE BEST CHANCE OF PRECIP
WILL BE ON THIS DAY. PRECIP WILL LIKELY BE LOW END SCTD AT
BEST...MAINLY IN THE VICINITY OF THE S SANGRES.

THURSDAY...MODELS DIVERGE SIGNIFICANTLY ON THIS DAY. GFS DROPS A
CUTOFF 500 MB LOW ACROSS C NEBRASKA WHILE EC HAS WEAK SW FLOW OVER
THE REGION. OBVIOUSLY...IF THE GFS IS CORRECT IT WILL BE COOLER
OVER THE REGION THEN THE EC. FOR NOW LEANED HEAVILY TOWARDS THE EC
GUIDANCE...KEEPING TEMPS UP INTO THE 70S AND 80S ACROSS THE
REGION.

FRIDAY...NOT MUCH CHANGE IN THE EXPECTED....A DEEP TROUGH MOVING
ONSHORE ACROSS CALIF WILL BE GRADUALLY MOVING TOWARDS THE REGION.
HOWEVER...TROUGH IS STILL FAR ENOUGH TO THE WEST...AND MID LVL
FLOW WILL REMAIN WEAKLY FROM THE SW. THIS WILL KEEP TEMPS MILD
WITH ONLY ISOLD POPS AT BEST.

OVERALL...TEMPS DURING THIS PERIOD WILL REMAIN ABOVE NORMAL WITH
MAX TEMPS IN THE L/M80S ACROSS THE PLAINS. THESE TEMPS ARE ABOUT 4
TO 7F ABOVE NORMAL FOR THIS TIME OF THE YEAR. EXCEPT FOR
TUESDAY...PRECIP CHANCES WILL BE LOW. WE ARE SIGNIFICANTLY BELOW
NORMAL FOR PRECIP OVER THE REGION FOR THE MONTH OF
SEPTEMBER....AND HAVE BEEN THIS WAY SINCE ABOUT MID AUGUST ACROSS
THE REGION (SEE TEMP/PRECIP MONTHLY CLIMO CHARTS ON THE BOTTOM OF
NWS PUEBLO WEBPAGE FOR SPECIFIC NUMBERS). /HODANISH

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SUNDAY AFTERNOON)
ISSUED AT 245 PM MDT SAT SEP 20 2014

VFR CONDITIONS ARE EXPECTED ACROSS MUCH OF THE AREA THROUGH THIS
EVENING...AS ISOLATED CONVECTION OVER THE HIGHER TERRAIN STRUGGLES
AT FIRST TO MAKE ANY MOVE FOR SEPARATION. HIGH RES MODELS SUGGEST
KALS WILL SEE VFR CONDITIONS OVER THE NEXT 24 HRS. KCOS SHOULD HAVE
VCTS AFTER 00Z...THEN SHOWERS INCREASING AFTER 02Z WITH IFR CIGS
POSSIBLE BY 10Z. KPUB IS EXPECTED TO HAVE VCSH AFTER 06Z...THEN PCPN
MOVES IN AND MVFR CIGS BY 09Z. THE PRIMARY THREATS WITH ANY STORMS
WILL BE CG LTG AND LOCAL WIND GUSTS AROUND 40 MPH.


&&

.PUB WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

$$

UPDATE...MOZLEY
SHORT TERM...MOORE
LONG TERM...HODANISH
AVIATION...MOORE



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