Area Forecast Discussion
Issued by NWS Pueblo, CO

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FXUS65 KPUB 010254
AFDPUB

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PUEBLO CO
754 PM MST SAT FEB 28 2015

.UPDATE...
ISSUED AT 749 PM MST SAT FEB 28 2015

...BLIZZARD WARNING FOR THE SAN JUANS...

HAVE UPGRADED THE SAN JUANS TO A BLIZZARD WARNING. CPW HAS SHOWN
THREE HOURS OF 50 PLUS MPH WINDS...ALONG WITH PERIODS OF HEAVY
SNOW. HIGH WINDS WILL CONTINUE OVERNIGHT. THERE WILL BE LOWER WIND
SPEEDS EARLY SUNDAY...BUT THEN THE JET DESCENDS AND EVEN STRONGER
WINDS ARE EXPECTED SUNDAY NIGHT...ALONG WITH SNOW RATES OF 2-3
INCHES PER HOUR. THIS IS AN EXCEPTIONAL EVENT EVEN BY SAN JUANS
STANDARDS...AND WILL BE LIFE THREATENING. ROAD CLOSURES WILL BE
LIKELY AND ANY ACTIVITY IN THE AREA WILL BE HAZARDOUS FOR PERIODS
OF THE WORST SNOW AND WIND. THIS IS A LONG DURATION EVENT AND EVEN
AFTER SNOW LETS UP LATE MONDAY...WINDS WILL ACTUALLY INCREASE AND
SIGNIFICANT DRIFTING AND SNOW LOAD WILL CONTINUE...LEADING TO
EXTREME AVALANCHE DANGER. ROSE

UPDATE ISSUED AT 613 PM MST SAT FEB 28 2015

BASED ON RADAR TRENDS AND HIGH RES GUIDANCE...HAVE REDUCED POPS
SLIGHTLY OVER I-25 AND THE PLAINS. MOST GUIDANCE NOT SHOWING ANY
QPF TONIGHT FOR THE ERN ZONES. WILL LEAVE LOW POPS IN...AS THERE
IS SOME UPPER FORCING AND POSSIBILITY OF MINOR JET INDUCED BANDS
THROUGH TONIGHT. BEST CHANCE CONTINUES TO BE OVER EL PASO. REST OF
FORECAST ON TRACK. ROSE

&&

.SHORT TERM...(THIS EVENING THROUGH SUNDAY)
ISSUED AT 252 PM MST SAT FEB 28 2015

CURRENTLY...AN UPPER TROUGH STRETCHED TO THE SW FROM THE GREAT BASIN
TO THE WEST COAST...WITH THE UPPER LOW LOCATED OVER CENTRAL CA. THIS
WAS STREAMING ABUNDANT MOISTURE ACROSS THE 4 CORNERS AND INTO
COLORADO. A BREAK IN THE CLOUD COVER THIS MORNING PROVIDED FOR A
PLEASANT FIRST HALF OF THE DAY...THOUGH TEMPS REMAINED COOL AND HAVE
ONLY WARMED INTO THE TEENS TO MID 20S ACROSS THE FORECAST AREA.
CLOUDS HAVE BEEN ON THE INCREASE FROM THE SW...AND INTERMITTENT SNOW
IS BEGINNING TO CREEP ACROSS THE AREA.

TONIGHT AND TOMORROW...THE UPPER LOW MOVES VERY LITTLE OVER THE NEXT
24 HRS...AND THE PLENTIFUL STREAM OF MOISTURE REMAINS CONSTANT. ONE
THING TO NOTE IS THAT ALL THE MODELS INDICATE THAT SNOWFALL IS A
NEAR CERTAINTY FOR THE HIGHER TERRAIN...AND ESPECIALLY ALONG THE
CONTDVD...SO ALL HIGHLIGHTS IN PLACE LOOK GOOD AT THIS TIME. THE SW
FLOW ALOFT WILL BRING IMPRESSIVE SNOW AMOUNTS TO SW FACING
SLOPES...AND AREAS SUCH AS WOLF CREEK ARE EXPECTED TO SEE SNOWFALL
AMOUNTS MEASURED IN FEET. AS FOR THE SLV AND EASTERN PLAINS...SHORT
RANGE AND HI RES MODELS ALL POINT TO ACTIVITY RAMPING UP FOR 6-9
HOURS THROUGH THE EVENING...THEN REALLY TAPERING OFF THROUGH THE
MORNING...AND THEN SLOWLY GETTING ACTIVE AGAIN BETWEEN 21Z AND 24Z
SUNDAY AFTN. THE MOISTURE FEED REMAINS CONSTANT...BUT THE TRIGGER
SEEMS TO BE DYNAMICS AND CAN BE TRACKED VIA THE VORT FIELDS.
HOWEVER...HAVING SAID ALL THAT...THE ATMOSPHERE IS PRIMED TO BE A
VERY EFFICIENT SNOW/FLURRY MAKER...SO AM VERY HESITANT TO PULL POPS
COMPLETELY THROUGH THE MORNING FOR THE PLAINS. THEREFORE...WILL KEEP
10 POPS DURING WHAT IS SUSPECTED TO BE LULL PERIODS. WHILE SNOWFALL
AMOUNTS WILL BE IMPRESSIVE FOR THE HIGHER ELEVATIONS...THE SLV AND E
PLAINS SHOULD SEE ONLY AN INCH OR TWO OF NEW ACCUMULATION OVER THE
NEXT 24 HRS. AS FOR TEMPS...NO CHANGE THERE AS COLD READINGS
WILL PERSIST. MOORE

.LONG TERM...(SUNDAY NIGHT THROUGH SATURDAY)
ISSUED AT 252 PM MST SAT FEB 28 2015

...UNSETTLED WEATHER THROUGH WEDNESDAY THEN WARMER TEMPERATURES
RETURN...

IT IS GOING TO REMAIN UNSETTLED THROUGH AT LEAST WEDNESDAY AS THE
TROUGH OVER THE WESTERN CONUS MOVES SLOWLY EAST. ONCE THIS TROUGH
PASSES THE REGION ON WEDNESDAY...IT WILL GRADUALLY START TO WARM UP.
HIGHS IN THE 50S ARE LIKELY TO RETURN BY FRIDAY. IN THE
MEANTIME...IT IS GOING TO BE COLD WITH ON AND OFF PERIODS OF SNOW
OVER THE PLAINS...WITH SNOW...VERY HEAVY AT TIMES...OVER THE
MOUNTAINS...ESPECIALLY OVER THE SW SLOPES OF THE SAN JUANS.

SUNDAY NIGHT INTO MONDAY...

A BAND OF DEEP MOISTURE AND A MODERATE JET WILL BE OVER THE REGION
00Z MONDAY (6 PM SUNDAY). THIS IS GOING TO ALLOW FOR HEAVY SNOW OVER
THE SAN JUANS SUNDAY EVENING WITH PERIODS OF SNOW OVER THE REMAINDER
OF THE REGION. THIS AREA OF SNOW WILL GRADUALLY LIFT NORTH THROUGH
THE NIGHT AND ESPECIALLY DURING THE DAY MONDAY...SO OVERALL POPS
WILL GRADUALLY DECREASE OVER THIS TIME PERIOD. WITH THAT SAID...SNOW
OVER THE CONTDVD WILL LIKELY CONTINUE BUT THE INTENSITY WILL SUBSIDE
SOMEWHAT MONDAY.

IT IS LIKELY TO BECOME QUITE BREEZY TO WINDY OVER REGIONS OF THE
FORECAST AREA MONDAY AS A LEAD TROUGH MOVES OVER THE REGION AND THE
GRADIENT TIGHTENS UP SIGNIFICANTLY. WINDS OVER THE
MOUNTAINS...ESPECIALLY THE SAN JUANS....SANGRE DE CRISTOS AND THE
WETS WILL BE QUITE STRONG...WITH GUSTS TO 40 TO 50 MPH LIKELY. PIKES
PEAK WILL ALSO GET GUSTY. WINDS WILL ALSO BECOME QUITE BRISK OVER
THE SAN LUIS VALLEY AND PARTS OF THE PLAINS. ON THE PLAINS...THE
BEST CHANCE FOR STRONGER WINDS WILL BE SOUTH OF A LINE FROM ROUGHLY
TRINIDAD TO LAMAR...AND POSSIBLY THE PALMER DIVIDE. THIS WIND WILL
ALLOW THINGS TO MIX OUT QUITE A BIT AND TEMPS MONDAY ARE LIKELY TO
WARM TO AROUND 40 MOST OF THE PLAINS AND VALLEYS...WITH MID 40S OVER
THE FAR SE PLAINS. AREAS WHICH REMAIN COOL WILL LIKELY BE THE PUEBLO
AREA. GIVEN THE STRONG FLOW...MAX TEMPS ON MONDAY ARE LIKELY GOING TO
BE REVISED IN LATER FCSTS...WITH THE WINDIER AREAS LIKELY WARMER
THAN WHAT THE CURRENT GRIDS SHOW...WHILE AREAS THAT DO NOT SEE
MUCH WIND MAY BE COOLER THAN CURRENT GRIDS SHOW.

DURING THE DAY MONDAY...LITTLE IF ANY PRECIP IS EXPECTED ON THE
PLAINS WITH MOST OF THE SNOW ALONG THE CONTDVD. SOME SNOW WILL ALSO
BE AT THE HIGHER ELEVATIONS OF THE REMAINDER OF THE MTNS OVER THE
FCST AREA.

MONDAY NIGHT INTO TUESDAY...

IT IS LIKELY GOING TO BE QUITE BREEZY/WINDY OVER THE REGION MONDAY
NIGHT AS THE GRADIENT ALOFT REALLY TIGHTENS UP. THIS WILL LIKELY
KEEP IT RELATIVELY MILD ON THE PLAINS...ESPECIALLY NORTH OF HIGHWAY
50 AND EAST OF THE MTNS. VERY WINDY CONDITIONS ARE LIKELY OVER ALL
OF THE MTNS...WITH THE STRONGEST WINDS GENERALLY SOUTH OF US-50. IT
IS NOT OUT OF THE QUESTION THAT THE WINTER STORM WARNINGS FOR THE
SAN JUANS MAY NEED TO BE UPGRADED TO A BLIZZARD WARNING FROM LATE
MONDAY INTO EARLY TUESDAY.

IT WILL BE DRY OVER THE PLAINS MONDAY NIGHT WITH SNOW OVER THE
MTNS. HEAVY SNOW IS POSSIBLE ALONG THE CONTDVD.

DURING THE DAY TUESDAY A STRONG COLD FRONT WILL MOVE DOWN THE
PLAINS. THIS WILL DECREASE THE SFC WINDS...AND MOISTURE WILL
GRADUALLY ONCE AGAIN INCREASE OVER THE PLAINS. HOWEVER...I EXPECT
IT TO REMAIN DRY OVER NEARLY ALL OF THE PLAINS UNTIL LATE IN THE
DAY TUESDAY. MAX TEMPS WILL OCCUR VERY EARLY DURING THE DAYLIGHT
HOURS ON TUESDAY FOR THE PUEBLO AND COLO SPRINGS AREA...WITH TEMPS
CRASHING BELOW FREEZING DURING THE LATE MORNING OR EARLY AFTERNOON
TIME PERIOD. THE OVERALL WARMEST TEMPS THIS DAY WILL OCCUR IN
EXTREME SE BACA COUNTY.

AS FLOW TRANSITIONS FOR SW TO NW ALOFT DURING TUESDAY...THE HEAVIEST
SNOW ALONG THE CONTDVD WILL DEVELOP OVER THE CENTRAL MOUNTAINS.

TUESDAY NIGHT INTO WEDNESDAY...

IT GETS QUITE COLD AND SNOWY ONCE AGAIN OVER THE PLAINS. TEMPS WILL
FALL INTO THE SINGLE DIGITS BY EARLY WED MORNING AND WIDESPREAD
LIGHT SNOW WILL LIKELY BE FALLING OVER MOST IF NOT ALL OF THE
PLAINS. LOW AT 700 WILL BE WESTERLY SO THE UPSLOPE WILL NOT BE DEEP
AND SNOW SHOULD BE LIGHT. SNOW WILL CONTINUE OVER THE C MTNS WITH
SNOW FINALLY DECREASING OVER THE SW MTNS. SNOW SHOULD END OVER THE
PLAINS LATE IN THE DAY ON WED. IF THE EC MODEL IS CORRECT...THE SNOW
MAY END EARLIER.

THURSDAY INTO THE WEEKEND...

DRY CONDITIONS RETURN. WE SHOULD SEE TEMPS AOA 40F FOR MAXES OVER
THE PLAINS THU...AND 50S FRI AND SAT. THIS DRY AND MILD PATTERN WILL
LIKELY CONTINUE THROUGH MID WEEK NEXT WEEK. /HODANISH

&&

.AVIATION...(FOR THE 00Z TAFS THROUGH 00Z SUNDAY EVENING)
ISSUED AT 252 PM MST SAT FEB 28 2015

FOR THE THREE MAIN TAF SITES OF KCOS...KPUB AND KALS...CLOUDS ARE ON
THE INCREASE FROM THE SW AND LIGHT SNOW IS EXPECTED TO RETURN AND
CONTINUE THIS EVE. MODERATE TO HEAVY SNOW IS FORECAST FOR THE HIGHER
TERRAIN THROUGH THE PERIOD...ESPECIALLY THE SOUTHERN MTS AND THE
CONTDVD. LOOK FOR MVFR TO IFR CONDITIONS DUE TO OCNL SN...FOG AND
LOWERING CLOUDS TO DEVELOP AT KCOS AND KPUB BETWEEN 23Z AND 02Z
THIS AFTN...AND TO PERSIST AT ALL THREE SITES THROUGH 12Z TOMORROW
MORN. ACTIVITY WILL TAPER OFF...THEN PICK UP AGAIN BY 21Z SUNDAY
AFTN.


&&

.PUB WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WARNING UNTIL 5 PM MST MONDAY FOR COZ058-060-061-
066-067-073-075.

WINTER WEATHER ADVISORY UNTIL 5 PM MST MONDAY FOR COZ059-064-065-
074.

BLIZZARD WARNING UNTIL 11 PM MST MONDAY FOR COZ068.

&&

$$

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


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