Special Weather Statement, NWS Pueblo, CO

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PUEBLO CO
1117 AM MDT FRI APR 15 2016

.UPDATE...
ISSUED AT 1029 AM MDT FRI APR 15 2016

UPDATE TO CONVERT BALANCE OF WINTER STORM WATCH. FOR THE
SAN LUIS VALLEY...HAVE GONE WITH A WARNING FOR THE NORTHERN
PORTION OF THE VALLEY. AREAS CLOSER TO PONCHA PASS...INCLUDING
VILLA GROVE...SHOULD SEE WARNING CRITERIA SNOWS OF UP TO A
FOOT. SOUTHERN PORTIONS OF THE VALLEY WILL BE HIGHLY DEPENDENT
ON THE TEMP PROFILE AND CHANGEOVER TO SNOW SAT MORNING.
KALS SNOW AMOUNTS COULD BE HIGHLY VARIABLE DEPENDING ON THE
CHANGEOVER TIMING...BUT SEVERAL INCHES SEEM REASONABLE.
ZONES EAST OF THE MOUNTAINS WILL ALSO HAVE HIGHLY VARIABLE
SNOW POTENTIAL BASED MAINLY ON ELEVATION. WITH SNOW LEVELS
IN THE 5000-6000 FOOT RANGE...VERY SLIGHT LOCAL TEMP VARIATIONS
WILL RESULT IN BIG SHIFTS OF SNOW ACCUMS. SO...WESTERN PORTIONS
OF FREMONT...HUERFANO...AND LAS ANIMAS COUNTIES WILL SEE THE
BEST POTENTIAL FOR SIGNIFICANT SNOW ACCUMS. FOR EXAMPLE... ERN
FREMONT COULD SEE SIGNIFICANTLY HIGHER ACCUMS FARTHER UP THE
ARKANSAS...WHERE ELEVATIONS ARE NR 6000 FEET...AS OPPOSED TO AREAS
NR FLORENCE AND PENROSE...WHICH ARE CLOSER TO 5000 FEET. ROSE

&&

.SHORT TERM...(TODAY AND TONIGHT)
ISSUED AT 510 AM MDT FRI APR 15 2016

...SEVERE STORMS...HEAVY SNOW...AND HEAVY RAIN...

A MAJOR STORM WILL IMPACT THE AREA BEGINNING TODAY.  SEVERE
THUNDERSTORM DEVELOPMENT IS LIKELY OVER THE EASTERN PLAINS THIS
AFTERNOON.  THE MOST LIKELY AREA FOR OCCURRENCE WILL BE OVER THE
PLAINS EAST OF THE I-25 CORRIDOR.  THE STORM PREDICTION CENTER HAS
THE AREA OF MARGINAL CONCERN EXTENDING BACK TO ABOUT A COLORADO
SPRINGS TO PUEBLO TO TRINIDAD LINE...WITH THE NEXT HIGHER LEVEL OF
CONCERN...THE SLIGHT RISK...JUST TO THE EAST OF EL PASO AND PUEBLO
COUNTIES...AND DROPPING SOUTH ACROSS LAS ANIMAS COUNTY. PLENTY OF
SHEAR...MOISTURE AND LIFT WILL BE PRESENT OVER THE PLAINS DURING THE
AFTERNOON.  WHEN COMBINED WITH A DRY LINE THAT IS FORMING OUT
THERE...SHOULD BE AN ACTIVE DAY FOR CONVECTION SOME OF WHICH WILL
LIKELY BE SEVERE. TORNADOES...LARGE HAIL...STRONG WINDS...HEAVY RAIN
AND LIGHTNING WILL ALL BE CONCERNS...PRIMARILY BETWEEN 1 PM AND
MIDNIGHT...WITH THE GREATEST LEVEL OF THREAT LIKELY BETWEEN 4 PM TO
10 PM. HOWEVER...CONVECTION WILL CONTINUE OVER THE PLAINS THROUGH
THE NIGHT...AND WILL HAVE TO BE MONITORED CLOSELY FOR SEVERE AND
FLASH FLOOD POTENTIAL.

HEAVY SNOW WILL SPREAD INTO THE CONTINENTAL DIVIDE THIS AFTERNOON
AND THEN EAST TO THE REST OF THE MOUNTAINS AND THE PALMER DIVIDE
OVERNIGHT TONIGHT. NEW SNOWFALL AMOUNTS BY SATURDAY MORNING WILL
GENERALLY RANGE FROM 4 TO 8 INCHES IN THE MOUNTAINS...WITH ANYWHERE
FROM 1 TO ABOUT 4 INCHES IN THE HIGH VALLEYS.  ACROSS THE LOWER
ELEVATIONS...THE SNOW LEVEL WILL START OUT KIND OF HIGH INITIALLY
THIS EVENING BUT THEN LOWER TO NEAR 6000 FEET OR SO BY SATURDAY
MORNING.  ACCUMULATIONS ABOVE 6000 FEET WILL BE HIGHLY
VARIABLE...RANGING FROM AS MUCH AS 4 INCHES ALONG THE PALMER DIVIDE
TO AN INCH OR LESS DOWN AT THE 6000 FOOT LEVEL.  BELOW 6000
FEET...PRIMARILY JUST RAIN THROUGH THE NIGHT...WITH SOME MODERATE TO
HEAVY SHOWERS POSSIBLE AT TIMES.  DUE TO ABUNDANT AMOUNTS OF
MOISTURE...LIFT AND INSTABILITY ASSOCIATED WITH THIS STORM
SYSTEM...EMBEDDED THUNDERSTORMS WILL ALSO BE PART OF THE MIX
STARTING THIS AFTERNOON.  JUST ABOUT ANYPLACE AROUND THE AREA COULD
SEE A THUNDERSTORM THIS AFTERNOON THROUGH TONIGHT.  THE PRIMARY
THREATS WITH ANY STORMS WILL BE LIGHTNING...GUSTY WINDS...HEAVY RAIN
AND HAIL.  AND...IN AREAS WHERE IT IS COLD ENOUGH...CONVECTIVE
SNOWFALL RATES OF 1 TO 2 INCHES PER HOUR WILL BE POSSIBLE WITH ANY
SUCH STORMS.

.LONG TERM...(SATURDAY THROUGH THURSDAY)
ISSUED AT 510 AM MDT FRI APR 15 2016

...A BLAST OF MOISTURE FOR THE REGION THIS WEEKEND...

SATURDAY THROUGH TUESDAY...A SLOW MOVING UPPER LOW PRESSURE SYSTEM
WILL TRACK ACROSS NORTHERN NEW MEXICO ON SATURDAY...WRAPPING
ABUNDANT MOISTURE UP INTO COLORADO WHILE AT THE SAME TIME DRAWING
COLDER AIR DOWN OUT OF MONTANA AND WYOMING. SIGNIFICANT SNOW AMOUNTS
ARE EXPECTED THROUGH SAT INTO EARLY SUN MORNING...AND NUMEROUS
HIGHLIGHTS ARE IN EFFECT FOR THE HIGHER ELEVATIONS. SNOW LEVELS ARE
FORECAST TO DROP TO JUST ABOVE 5000 FEET...WHICH KEEPS PUEBLO IN
RAIN BUT SPREADS SNOW ACROSS COLORADO SPRINGS. ALSO...MAX TEMP FOR
THE DAY ON SAT FOR THE I25 CORRIDOR WILL LIKELY OCCUR BETWEEN 8 AM
AND 10 AM...WITH FALLING TEMPS THEN THROUGH THE REMAINDER OF THE
MORNING AND AFTERNOON. MAX TEMPS ARE FORECAST TO ONLY CLIMB INTO THE
30S AND 40S...THOUGH THE FAR EASTERN PLAINS NEAR THE KANSAS BORDER
SHOULD WARM TO AROUND 60F. ALSO...CONTINUING ENHANCED DYNAMICS AND
SHEAR DICTATE THUNDERSTORM MENTION THROUGHOUT THE DAY.

THE UPPER LOW SLOWLY SLIDES TO THE NORTH TO THE CO/WY BORDER ON
SUN...LOWERING PCPN CHANCES AS MODELS INDICATE SOME DRIER AIR
GETTING WRAPPED UP IN THE LOW AND SLIPPING INTO SE CO. THE LOW
FLATTENS OUT OVER WY AND CO ON MON...THEN FINALLY EDGES TO THE EAST
OUT OF THE AREA ON TUE. SUNDAY WILL LIKELY BE THE COLDEST DAY OF THE
EXTENDED PERIOD...WITH BOTH SUN MORNING AND MON MORNING BEING THE
COLDEST MORNINGS. ANY NEW PLANTINGS SHOULD BE ATTENDED TO BOTH
MORNINGS JUST TO BE SAFE.

TEMPS WILL START WARMING BACK UP MON AND EVEN MORE SO TUE...BUT THIS
IS EXPECTED TO BE ABOUT A 4 DAY PERIOD OF UNSETTLED AND COOL WEATHER
WITH A HEALTHY AMOUNT OF MOISTURE BEING INJECTED INTO THE LOCAL
SYSTEM.

WEDNESDAY AND THURSDAY...TEMPORARY RIDGING RETURNS TO THE
REGION...WITH JUST ISOLATED CONVECTION FORECAST FOR THE HIGHER
TERRAIN EACH AFTN. TEMPS ARE FORECAST TO CLIMB INTO THE 60S ON
WED...THEN 60S TO MID 70S FOR THU. MOORE

&&

.AVIATION...(FOR THE 18Z TAFS THROUGH 18Z SATURDAY AFTERNOON)
ISSUED AT 1109 AM MDT FRI APR 15 2016

A MAJOR SPRING STORM IS ON TRACK TO AFFECT OUR AREA THROUGH THE
WEEKEND. SIGNIFICANT IMPACT ARE EXPECTED TO THE TAF
TERMINALS...PARTICULARLY KCOS AND KALS. HAZARDOUS FLIGHT
CONDITIONS ARE EXPECTED...ESPECIALLY FROM 06Z TONIGHT THROUGH
MUCH OF SATURDAY. VERTICAL AND HORIZONTAL WIND SHEAR WILL BE
HIGH THROUGH SAT EVE. AT KALS...EXPECT CONDITIONS TO DETERIORATE
AFTER 06-09Z TONIGHT AS PRECIP CHANGES OVER TO SN. IFR IS LIKELY
SAT MORNING. AT KCOS...MAIN CONCERN WILL BE STRONG N-NE WINDS
TONIGHT THROUGH SAT. WITH PRECIP LIKELY CHANGING TO SN SAT
MORNING...COULD SEE IFR-VLIFR CONDITIONS DEVELOP AS WINDS GUST
IN THE 40 KT RANGE. AT KPUB...PRECIP WILL LIKELY REMAIN AS RA
THROUGH SATURDAY...BUT MVFR-IFR CONDITIONS ARE LIKELY DURING THIS
TIME. THIS SYSTEM IS VERY DYNAMIC...SO E4XPECT FREQUENT UPDATES TO
EXPECTED CONDITIONS. ROSE

&&

.PUB WATCHES/WARNINGS/ADVISORIES...
WINTER STORM WARNING UNTIL 6 AM MDT SUNDAY FOR COZ058>060-066-
068.

WINTER STORM WARNING FROM 6 PM THIS EVENING TO 6 AM MDT SUNDAY
FOR COZ061>063-065-067-072>080.

WINTER WEATHER ADVISORY FROM 6 AM SATURDAY TO 6 AM MDT SUNDAY
FOR COZ070-071-083-088.

RED FLAG WARNING UNTIL 7 PM MDT THIS EVENING FOR COZ229-230-233.

WINTER STORM WARNING FROM 6 AM SATURDAY TO 6 AM MDT SUNDAY FOR
COZ069-087.

WINTER STORM WARNING FROM 3 PM THIS AFTERNOON TO 6 AM MDT SUNDAY
FOR COZ081-082.

WINTER STORM WARNING FROM MIDNIGHT TONIGHT TO 6 AM MDT SUNDAY
FOR COZ084.

&&

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

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SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PUEBLO CO
1237 PM MDT FRI APR 15 2016

COZ095-097-151915-
WESTERN KIOWA COUNTY CO-LAS ANIMAS VICINITY/BENT COUNTY CO-
1237 PM MDT FRI APR 15 2016

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN KIOWA AND CENTRAL
BENT COUNTIES UNTIL 115 PM MDT...

AT 1236 PM MDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM 15
MILES SOUTH OF LAS ANIMAS...OR 23 MILES EAST OF NORTH LA JUNTA...MOVING
NORTH AT 30 MPH.

HALF INCH HAIL AND WINDS IN EXCESS OF 40 MPH WILL BE POSSIBLE WITH
THIS STORM.

LOCATIONS IMPACTED INCLUDE...
JOHN MARTIN RESERVOIR...HASTY...FORT LYON AND CADDOA.

LAT...LON 3775 10305 3780 10327 3827 10317 3820 10284
TIME...MOT...LOC 1836Z 194DEG 24KT 3785 10314

KT