Blizzard Watch 1, NWS Denver/Boulder, CO

998 
WWUS45 KBOU 011654
WSWBOU

URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE DENVER CO
1054 AM MDT TUE NOV 1 2011

...WINTER WEATHER RETURNING TO NORTH CENTRAL AND NORTHEAST
COLORADO TONIGHT AND WEDNESDAY MORNING WITH BLIZZARD CONDITIONS
EXPECTED OVER THE PALMER DIVIDE AND LINCOLN COUNTY LATE TONIGHT
AND WEDNESDAY MORNING...

.A FAST MOVING AND POTENT UPPER LEVEL STORM SYSTEM WILL MOVE
ACROSS COLORADO TONIGHT THROUGH WEDNESDAY MORNING. IN ADDITION A
SURFACE COLD FRONT WILL BRING COLDER TEMPERATURES TO THE REGION.
SNOW WILL DEVELOP IN THE MOUNTAINS LATER TODAY...WHILE A MIX OF
RAIN AND SNOW ARE EXPECTED EARLY THIS EVENING ON THE PLAINS. AS
EVENING TEMPERATURES FALL BEHIND THE COLD FRONT...PRECIPITATION ON
THE PLAINS WILL QUICKLY CHANGE TO ALL SNOW BECOMING HEAVY AT
TIMES.

STRONG NORTH WINDS ARE EXPECTED TO DEVELOP OVERNIGHT WHICH WILL PRODUCE
BLIZZARD CONDITIONS LATE TONIGHT THROUGH WEDNESDAY MORNING OVER
THE PALMER DIVIDE AND ACROSS LINCOLN COUNTY AS WIND WILL GUST TO 50
MPH AT TIMES. AS A RESULT...TRAVEL WILL LIKELY BECOME IMPOSSIBLE
ACROSS EASTERN DOUGLAS...ELBERT AND LINCOLN COUNTIES INCLUDING
INTERSTATE 70.

COZ041-046-047-020100-
/O.UPG.KBOU.BZ.A.0001.111102T0600Z-111102T1800Z/
/O.NEW.KBOU.BZ.W.0001.111102T0600Z-111102T1800Z/
ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES ABOVE 6000 FEET-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-
SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN COUNTY-
INCLUDING THE CITIES OF...CASTLE ROCK...ELBERT...FONDIS...KIOWA...
LARKSPUR...AGATE...HUGO...LIMON...MATHESON...FORDER...KARVAL...
KUTCH...PUNKIN CENTER
1054 AM MDT TUE NOV 1 2011

...BLIZZARD WARNING IN EFFECT FROM MIDNIGHT TONIGHT TO NOON MDT
WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A BLIZZARD
WARNING...WHICH IS IN EFFECT FROM MIDNIGHT TONIGHT TO NOON MDT
WEDNESDAY. THE BLIZZARD WATCH IS NO LONGER IN EFFECT. 

* TIMING...A MIX OF RAIN AND SNOW IS EXPECTED TO DEVELOP EARLY
  THIS EVENING AND THEN CHANGE TO SNOW BY MID EVENING. THE SNOW
  WILL BE HEAVY AT TIMES THROUGH EARLY WEDNESDAY MORNING WITH
  SNOWFALL RATES AROUND 1 INCH PER HOUR.

* ACCUMULATION/WIND...TOTAL ACCUMULATIONS OF 4 TO 8 INCHES WILL BE
  POSSIBLE. NORTH WINDS WILL INCREASE TO 25 TO 35 MPH WITH SOME
  GUSTS TO 50 MPH AFTER MIDNIGHT THROUGH WEDNESDAY MORNING WITH
  BLIZZARD CONDITIONS EXPECTED.

* MAIN IMPACT...ROADS WILL BECOME ICY AND SNOWPACKED TONIGHT WITH
  VERY HAZARDOUS TRAVEL CONDITIONS. VISIBILITIES WILL BE REDUCED
  TO NEAR ZERO AT TIMES AFTER MIDNIGHT WITH TRAVEL BECOMING NEARLY
  IMPOSSIBLE THROUGH WEDNESDAY MORNING.

* OTHER IMPACTS...TEMPERATURES WILL BE TURNING MUCH COLDER WITH
  WIND CHILL READINGS DROPPING TO NEAR 10 DEGREES

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A BLIZZARD WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
OCCURRING OR IMMINENT. SUSTAINED WIND AND/OR FREQUENT WIND GUSTS
OF 35 MPH OR HIGHER WILL COMBINE WITH CONSIDERABLE FALLING AND
BLOWING SNOW TO PRODUCE WIDESPREAD VISIBILITIES BELOW ONE QUARTER
OF A MILE.  TRAVEL WILL BE EXTREMELY DANGEROUS AND IS DISCOURAGED
IN THESE WHITEOUT CONDITIONS. IF YOU MUST TRAVEL...HAVE A WINTER
SURVIVAL KIT WITH YOU. IF YOU GET STRANDED...STAY WITH YOUR
VEHICLE AND WAIT FOR HELP TO ARRIVE.

&&

$$

COZ035-036-020100-
/O.UPG.KBOU.WW.Y.0038.111102T0000Z-111102T1800Z/
/O.NEW.KBOU.WS.W.0012.111102T0000Z-111102T1800Z/
LARIMER AND BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-
JEFFERSON AND WEST DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR
CREEK/NORTHEAST PARK COUNTIES BELOW 9000 FEET-
INCLUDING THE CITIES OF...ESTES PARK...GLENDEVEY...NEDERLAND...
RED FEATHER LAKES...BAILEY...CENTRAL CITY...EVERGREEN...
GEORGETOWN...IDAHO SPRINGS...WESTCREEK
1054 AM MDT TUE NOV 1 2011

...WINTER STORM WARNING IN EFFECT FROM 6 PM THIS EVENING TO NOON
MDT WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER STORM
WARNING FOR SNOW...WHICH IS IN EFFECT FROM 6 PM THIS EVENING TO
NOON MDT WEDNESDAY. THE WINTER WEATHER ADVISORY IS NO LONGER IN
EFFECT.

* TIMING...SNOW IS EXPECTED TO DEVELOP BY EARLY THIS EVENING. THE
  SNOW WILL BE HEAVY WITH PERIODS OF 1 TO 2 INCH PER HOUR SNOWFALL
  RATES OVERNIGHT.

* ACCUMULATION/WIND...TOTAL ACCUMULATIONS OF 7 TO 14 INCHES CAN BE
  EXPECTED BY NOON WEDNESDAY. WINDS WILL BE NORTHEAST AT 15 TO 25
  MPH WHICH WILL PRODUCE SOME BLOWING AND DRIFTING SNOW.

* MAIN IMPACT...ROADS WILL BE ICY AND SNOWPACKED WITH HAZARDOUS 
  TRAVEL CONDITIONS. VISIBILITIES MAY ALSO BE REDUCED TO LESS 
  THAN ONE QUARTER MILE IN AREAS OF HEAVIER SNOWFALL. 

* OTHER IMPACTS...TEMPERATURES WILL BE TURNING MUCH COLDER WITH
  WIND CHILL READINGS DROPPING INTO THE SINGLE DIGITS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A WINTER STORM WARNING MEANS HAZARDOUS WINTER WEATHER
CONDITIONS ARE IMMINENT OR HIGHLY LIKELY. SIGNIFICANT SNOW
ACCUMULATIONS ARE OCCURRING OR EXPECTED. STRONG WINDS ARE ALSO
POSSIBLE. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

&&

$$

COZ039-040-045-049-020100-
/O.UPG.KBOU.WW.Y.0038.111102T0300Z-111102T1800Z/
/O.NEW.KBOU.WS.W.0012.111102T0300Z-111102T1800Z/
BOULDER AND JEFFERSON COUNTIES BELOW 6000 FEET/WEST BROOMFIELD
COUNTY-
NORTH DOUGLAS COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND
ARAPAHOE COUNTIES/EAST BROOMFIELD COUNTY-
CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-WASHINGTON COUNTY-
INCLUDING THE CITIES OF...ARVADA...BOULDER...GOLDEN...LAKEWOOD...
LONGMONT...AURORA...BRIGHTON...CITY OF DENVER...
DENVER INTERNATIONAL AIRPORT...HIGHLANDS RANCH...LITTLETON...
PARKER...BENNETT...BYERS...DEER TRAIL...LEADER...AKRON...COPE...
LAST CHANCE...OTIS
1054 AM MDT TUE NOV 1 2011

...WINTER STORM WARNING IN EFFECT FROM 9 PM THIS EVENING TO NOON
MDT WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER STORM
WARNING FOR SNOW AND BLOWING SNOW...WHICH IS IN EFFECT FROM 9 PM
THIS EVENING TO NOON MDT WEDNESDAY. THE WINTER WEATHER ADVISORY IS
NO LONGER IN EFFECT.

* TIMING...A MIX OF RAIN AND SNOW IS EXPECTED TO DEVELOP EARLY
  THIS EVENING...QUICKLY CHANGING OVER TO SNOW BY MID EVENING. THE
  SNOW WILL BE HEAVY AT TIMES OVERNIGHT WITH SNOWFALL RATES AROUND 1
  INCH PER HOUR.

* ACCUMULATION/WIND...TOTAL ACCUMULATIONS 5 TO 10 INCHES CAN BE
  EXPECTED...WITH THE HIGHEST AMOUNTS NEAR THE FOOTHILLS AND ALONG
  THE SOUTHERN SUBURBS OF DENVER. NORTH WINDS OF 15 TO 25 MPH WILL
  OCCUR...WITH STRONGER GUSTS EAST OF INTERSTATE 25 MPH.

* MAIN IMPACT...ROADS WILL BECOME ICY AND SNOWPACKED TONIGHT WITH
  HAZARDOUS TRAVEL CONDITIONS. VISIBILITIES MAY ALSO BE REDUCED TO
  LESS THAN ONE QUARTER MILE IN AREAS OF HEAVIER SNOWFALL AND
  BLOWING SNOW. HEAVY SNOW MAY ACCUMULATE ON TREES RESULTING IN
  ADDITIONAL TREE DAMAGE AND SCATTERED POWER OUTAGES.

* OTHER IMPACTS...TEMPERATURES WILL BE TURNING MUCH COLDER WITH
  WIND CHILL READINGS DROPPING TO NEAR 10 DEGREES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A WINTER STORM WARNING MEANS HAZARDOUS WINTER WEATHER
CONDITIONS ARE IMMINENT OR HIGHLY LIKELY. SIGNIFICANT SNOW
ACCUMULATIONS ARE OCCURRING OR EXPECTED. STRONG WINDS ARE ALSO
POSSIBLE. THIS WILL MAKE TRAVEL VERY HAZARDOUS OR IMPOSSIBLE.

&&

$$

COZ030>032-020100-
/O.EXA.KBOU.WW.Y.0038.111102T0000Z-111102T1800Z/
JACKSON COUNTY BELOW 9000 FEET-
WEST JACKSON AND WEST GRAND COUNTIES ABOVE 9000 FEET-
GRAND AND SUMMIT COUNTIES BELOW 9000 FEET-
INCLUDING THE CITIES OF...GOULD...NORTH PARK...RAND...SPICER...
WALDEN...EAST SLOPES PARK AND NORTHERN GORE RANGES...GORE PASS...
RABBIT EARS PASS...DILLON...FRASER...GRANBY...GRAND LAKE...
HOT SULPHUR SPRINGS...KREMMLING
1054 AM MDT TUE NOV 1 2011

...WINTER WEATHER ADVISORY IN EFFECT FROM 6 PM THIS EVENING TO
NOON MDT WEDNESDAY...

THE NATIONAL WEATHER SERVICE IN DENVER HAS ISSUED A WINTER
WEATHER ADVISORY FOR SNOW...WHICH IS IN EFFECT FROM 6 PM THIS EVENING
TO NOON MDT WEDNESDAY.

* TIMING...SNOW IS EXPECTED TO DEVELOP BY THIS EVENING. THE SNOW
  WILL BE HEAVY WITH A PERIOD OF 1 TO 2 INCH PER HOUR SNOWFALL
  RATES OVERNIGHT.

* ACCUMULATION/WIND...TOTAL ACCUMULATIONS OF 4 TO 8 INCHES CAN BE
  EXPECTED. WINDS WILL BE NORTHEAST AT 10 TO 20 MPH.

* MAIN IMPACT...ROADS WILL BE ICY AND SNOWPACKED WITH HAZARDOUS 
  TRAVEL CONDITIONS. VISIBILITIES MAY ALSO BE REDUCED TO LESS 
  THAN ONE QUARTER MILE IN AREAS OF HEAVIER SNOWFALL. 

* OTHER IMPACTS...TEMPERATURES WILL BE TURNING MUCH COLDER WITH 
  WIND CHILL READINGS DROPPING INTO THE SINGLE DIGITS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT SNOW...BLOWING SNOW...OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$

COZ033-034-020100-
/O.CON.KBOU.WW.Y.0038.111102T0000Z-111102T1800Z/
SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/
NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-
SOUTH AND SOUTHEAST GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/
GILPIN/CLEAR CREEK/SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE
9000 FEET-
INCLUDING THE CITIES OF...CAMERON PASS...
LARAMIE AND MEDICINE BOW MOUNTAINS...RABBIT EARS RANGE...
ROCKY MOUNTAIN NATIONAL PARK...WILLOW CREEK PASS...
BERTHOUD PASS...BRECKENRIDGE...EAST SLOPES MOSQUITO RANGE...
EAST SLOPES SOUTHERN GORE RANGE...EISENHOWER TUNNEL...
INDIAN PEAKS...KENOSHA MOUNTAINS...MOUNT EVANS...
WILLIAMS FORK MOUNTAINS...WINTER PARK
1054 AM MDT TUE NOV 1 2011

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO NOON MDT WEDNESDAY...

A WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 6 PM THIS
EVENING TO NOON MDT WEDNESDAY. 

* TIMING...SNOW IS EXPECTED TO DEVELOP BY THIS EVENING. THE SNOW
  WILL BE HEAVY WITH A PERIOD OF 1 TO 2 INCH PER HOUR SNOWFALL
  RATES OVERNIGHT.

* ACCUMULATION/WIND...TOTAL ACCUMULATIONS OF 5 TO 10 INCHES CAN BE
  EXPECTED. WINDS WILL BE NORTHEAST AT 10 TO 20 MPH.

* MAIN IMPACT...ROADS WILL BE ICY AND SNOWPACKED WITH HAZARDOUS 
  TRAVEL CONDITIONS. VISIBILITIES MAY ALSO BE REDUCED TO LESS 
  THAN ONE QUARTER MILE IN AREAS OF HEAVIER SNOWFALL. 

* OTHER IMPACTS...TEMPERATURES WILL BE TURNING MUCH COLDER WITH 
  WIND CHILL READINGS DROPPING INTO THE SINGLE DIGITS. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT SNOW...BLOWING SNOW...OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$

COZ038-042>044-048-050-051-020100-
/O.CON.KBOU.WW.Y.0038.111102T0300Z-111102T1800Z/
LARIMER COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-
NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD COUNTY-MORGAN COUNTY-
LOGAN COUNTY-SEDGWICK COUNTY-PHILLIPS COUNTY-
INCLUDING THE CITIES OF...FORT COLLINS...HEREFORD...LOVELAND...
NUNN...BRIGGSDALE...GROVER...PAWNEE BUTTES...RAYMER...STONEHAM...
EATON...FORT LUPTON...GREELEY...ROGGEN...BRUSH...FORT MORGAN...
GOODRICH...WIGGINS...CROOK...MERINO...STERLING...PEETZ...
JULESBURG...OVID...SEDGWICK...AMHERST...HAXTUN...HOLYOKE
1054 AM MDT TUE NOV 1 2011

...WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 PM THIS
EVENING TO NOON MDT WEDNESDAY...

A WINTER WEATHER ADVISORY REMAINS IN EFFECT FROM 9 PM THIS
EVENING TO NOON MDT WEDNESDAY. 

* TIMING...A MIX OF RAIN AND SNOW IS EXPECTED TO DEVELOP EARLY
  THIS EVENING...QUICKLY CHANGING TO SNOW BY MID EVENING. THE
  SNOW MAY BE HEAVY AT TIMES OVERNIGHT WITH SNOWFALL RATES AROUND
  1 INCH PER HOUR.

* ACCUMULATION/WIND...TOTAL ACCUMULATIONS OF 3 TO 6 INCHES CAN BE
  EXPECTED. NORTH WINDS OF 15 TO 25 MPH WILL OCCUR...WITH SOME
  GUSTS UP TO 40 MPH.

* MAIN IMPACT...ROADS WILL BECOME ICY AND SNOWPACKED TONIGHT WITH
  HAZARDOUS TRAVEL CONDITIONS. VISIBILITIES WILL BE REDUCED AT
  TIMES TO LESS THAN ONE QUARTER MILE IN AREAS OF HEAVIER SNOWFALL
  AND BLOWING SNOW. HEAVY SNOW MAY ACCUMULATE ON TREES  RESULTING
  IN ADDITIONAL TREE DAMAGE AND SCATTERED POWER OUTAGES.

* OTHER IMPACTS...TEMPERATURES WILL BE TURNING MUCH COLDER WITH 
  WIND CHILL READINGS DROPPING TO NEAR 10 DEGREES. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A WINTER WEATHER ADVISORY MEANS THAT SNOW...BLOWING SNOW...OR
FREEZING DRIZZLE WILL CAUSE TRAVEL DIFFICULTIES. BE PREPARED FOR
SLIPPERY ROADS AND LIMITED VISIBILITIES...AND USE CAUTION WHILE
DRIVING.

&&

$$
LESZCYNSKI/COOPER

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE DENVER CO
425 AM MDT TUE NOV 1 2011

.SHORT TERM...TODAY WILL BE THE TRANSITION DAY FROM YESTERDAYS
INDIAN SUMMER BACK TO A TASTE OF WINTER.  A WEAK...INITIAL COLD
FRONT HAS MOVED THROUGH KGXY IN THE PAST HOUR AND SHOULD ARRIVE IN
DENVER BY 12Z.  STRATUS CLOUDS...NORTHERLY WINDS AND COOLER
TEMPERATURES THROUGH THE AFTERNOON SHOULD BE THE MAIN EFFECTS FROM
THE INITIAL COLD FRONT.  THE STRONGER FRONT WITH MUCH COLDER
TEMPERATURES AND STRONGER WINDS IS NOT EXPECTED UNTIL AFTER 01Z THIS
EVENING.  AHEAD OF THIS COLD FRONT...THE POSITIVE TILT UPPER LEVEL
SHORT WAVE SHOULD BEGIN PRODUCING SNOW IN THE MOUNTAINS BY EARLY
AFTERNOON.  DURING THE LATE AFTERNOON...AREAS OF RAIN OR MIXED RAIN
AND SNOW SHOULD BEGIN SPREADING ONTO THE PLAINS.  Q-G DIAGNOSTIC
ANALYSIS PACKAGE CONTINUES TO SHOW A PERIOD OF STRONG RISING MOTIONS
OVER NORTH CENTRAL AND NORTHEAST COLORADO THROUGH THIS AFTERNOON AND
TONIGHT.  THE UPPER LEVEL JET WILL ALSO BE LOCATED OVER THE
STATE...SIMILAR TO THE SITUATION WE HAD A WEEK AGO.  FRONTOGENETIC
FORCING ASSOCIATED WITH THE UPPER JET COULD LEAD TO BANDED
PRECIPITATION STRUCTURES THROUGH THE EVENING AND OVERNIGHT.  WITH
THE STRONG FORCING OVER THE STATE...MODERATE TO HEAVY SNOWFALL RATES
CAN BE EXPECTED.  ONE TO TWO INCH PER HOUR SNOWFALLS WILL BE
POSSIBLE IN THE MOUNTAINS AND RATES AROUND ONE INCH PER HOUR CAN BE
EXPECTED ON THE PLAINS.  THE LIMITING FACTOR IN THIS STORM IS GOING
TO BE THE SPEED THAT THE UPPER TROUGH PASSES OVER THE REGION.  MOST
PRECIPITATION FROM THIS EVENT IS GOING TO FALL IN A 12 TO 15 HOUR
PERIOD WITH RAPID IMPROVEMENT EXPECTED BY MIDDAY WEDNESDAY.  THE
OTHER PROBLEM THAT THIS STORM WILL PRESENT IS INCREASING WINDS ON
THE PLAINS THROUGH THE NIGHT.  THE PRESSURE GRADIENT BETWEEN CENTRAL
WYOMING AND NORTHERN TEXAS LOOKS LIKE IT WILL EXCEED 25 MB BY 06Z
TONIGHT.  AS WINDS INCREASE TO 30 TO 40 MPH ACROSS THE
PLAINS...BLOWING AND DRIFTING SNOW MAY BECOME THE MAIN PROBLEM.
EVEN STRONGER WINDS ARE EXPECTED OVER THE PALMER DIVIDE AS THE WINDS
ACCELERATE OVER THE HIGHER TERRAIN OF ELBERT AND LINCOLN COUNTIES.
BLIZZARD LIKE CONDITIONS WILL BE QUITE POSSIBLE IN THESE AREAS.

THIS BRINGS US TO THE HIGHLIGHTS.  WILL ISSUE A WINTER WEATHER
ADVISORY FOR THE MOUNTAINS AND FOOTHILLS FOR SNOW AMOUNTS UP TO 12
INCHES.  WILL ALSO ISSUE A WINTER WEATHER ADVISORY FOR SNOW AND
BLOWING SNOW ACROSS MOST OF THE NORTHEAST COLORADO PLAINS.  THE
STRONGER WINDS OVER THE PALMER DIVIDE WILL NECESSITATE A BLIZZARD
WATCH FOR ZONES 41...46 AND 47.

.LONG TERM...SYSTEM WILL MOVE RAPIDLY SE OF AREA ON WED.  QG FIELDS
SHOW DECENT MID LVL QG ASCENT THRU MID MORNING WITH STG QG DESCENT
DEVELOPING BY 18Z OVER THE ENTIRE AREA WITH DECREASING MOISTURE.
SNOW SHOULD QUICKLY END BY SUNRISE ALONG THE CO-WY BORDER AND THEN
GRADUALLY END FM NORTH TO SOUTH BY MIDDAY.  GUSTY NORTH WINDS WILL
PRODUCE QUITE A BIT OF BLOWING SNOW AND POOR VISIBILITIES THRU THE
MORNING HOURS ALONG AND EAST OF I-25 AND OVER THE PLAINS WITH THE
WORST CONDITIONS PROBABLY OVER THE PALMER DIVIDE TOWARDS LIMON WHERE
BLIZZARD CONDITIONS MAY OCCUR.  CONDITIONS SHOULD GRADUALLY
IMPROVE BY MIDDAY AS WINDS BEGIN TO DECREASE AND SNOW ENDS.  IN THE
MTNS SNOW WILL CONTINUE IN THE MORNING BUT SHOULD BEGIN TO DECREASE
BY MIDDAY AS WELL.

FOR THU AN UPPER LEVEL RIDGE WILL BUILD OVER THE AREA WITH DRY
CONDITIONS.  HIGH TEMPS OVER NERN CO WILL LIKELY BE AFFECTED BY SNOW
COVER SO WILL KEEP HIGHS AROUND 10 DEGREES BLO GUIDANCE IN MOST
AREAS.  BY FRI THE FLOW ALOFT WILL BECOME SWLY AS ANOTHER SYSTEM
DIGS INTO THE WRN US.  SHOULD SEE WARMER TEMPS ON FRI AS A SFC LEE
TROUGH DEVELOPS WITH LOW LEVEL WINDS BECOME SWLY WITH HIGHS IN THE
LOWER TO MID 50S ACROSS NERN CO.  WILL SEE SOME INCREASE IN MID AND
HIGH LEVEL CLOUDS BUT SHOULD SEE ANOTHER DRY DAY ACROSS NRN CO.

FOR SAT THERE IS SOME DISAGREEMENT AMONG THE LONGER RANGE MODELS
WITH HANDLING OF NEXT UPPER LEVEL TROUGH.  THE GFS AND CANADIAN HAVE
AN UPPER LEVEL LOW TRACKING ACROSS SRN WY ON SAT WHILE THE ECMWF HAS
IT FURTHER SOUTH OVER SRN COLORADO.  NATURALLY IF IT ENDS UP OVER
SRN WY THE BEST CHC OF SNOW WILL BE IN THE MTNS WITH A POTENTIAL
HIGH WIND EVENT IN THE FOOTHILLS AND ACROSS NERN CO WITH MAINLY DRY
CONDITIONS.  MEANWHILE IF IT WERE TO END UP OVER SRN COLORADO LIKE
ECMWF SHOWS THEN SNOW CHANCES WOULD INCREASE CONSIDERABLY OVER
PORTIONS OF NERN CO.  AT THIS WILL NOT ALTER PREVIOUS FCST MUCH
SINCE THERE IS STILL A LOT OF UNCERTAINTY WITH THIS SYSTEM.  BY SUN
THE SYSTEM WILL MOVE RAPIDLY EAST OF THE AREA AS THE FLOW ALOFT
BECOME MORE WLY AND DRIER AIR MOVES IN.  HIGHS ON SUN OVER NERN CO
WILL MAINLY BE IN THE 40S BASED ON LATEST 850-700 MB TEMPS.

BY EARLY NEXT WEEK ANOTHER UPPER LEVEL TROUGH MAY AFFECT THE AREA FM
LATE MON INTO TUE HOWEVER THE ECMWF AND GFS HAVE VASTLY DIFFERENT
SOLUTIONS.  THE ECMWF KEEPS THIS NEXT SYSTEM FURTHER SOUTH OVER THE
SRN ROCKIES WHILE THE GFS HAS IT OVER COLORADO.  FOR NOW WILL JUST
GO WITH THE DRIER CONSENSUS NUMBERS UNTIL IT BECOMES MORE CLEAR HOW
THIS SYSTEM WILL EVOLVE.

&&

.AVIATION...WEAK COLD FRONT WILL MOVE THROUGH THE DENVER AREA THIS
MORNING WITH A WIND SHIFT TO NORTHERLY AND SOME STRATUS CLOUDS
BETWEEN 2500 AND 5000 FT AGL.  INCREASING MID LEVEL CLOUDS ARE
EXPECTED THROUGH THE AFTERNOON WITH AREAS OF RAIN DEVELOPING TOWARDS
EVENING.  STRONGER COLD FRONT WITH TEMPERATURES FALLING TO FREEZING
IS EXPECTED TO MOVE THROUGH DENVER BETWEEN 7 PM AND 10 PM.
PRECIPITATION WILL CHANGE TO SNOW AND BECOME MODERATE AT TIMES WITH
IFR CEILINGS.  NORTHERLY WINDS WILL INCREASE THROUGH THE NIGHT WHICH
MAY PRODUCE SOME BLOWING AND DRIFTING SNOW AFTER MIDNIGHT.  SNOWFALL
RATES UP TO 1 INCH PER HOUR WILL BE POSSIBLE BETWEEN 10 PM AND 8
AM.  SNOW WILL BEGIN DIMINISHING AFTER 8 AM WEDNESDAY MORNING AND
STORM SHOULD BE OVER BY EARLY AFTERNOON.  TOTAL SNOW ACCUMULATIONS
OF 4 TO 8 INCHES CAN BE EXPECTED.

&&

.BOU WATCHES/WARNINGS/ADVISORIES...
BLIZZARD WATCH LATE TONIGHT AND WEDNESDAY MORNING FOR THE PALMER
    DIVIDE COZ041-046-047.
WINTER WEATHER ADVISORY FROM TUESDAY EVENING THROUGH WEDNESDAY
    MORNING FOR COZ038>040-042>045-048>051.
WINTER WEATHER ADVISORY FROM TUESDAY EVENING THROUGH WEDNESDAY
    MORNING FOR COZ033>036.

&&

KDRBY/RPK

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE DENVER CO
1043 AM MDT MON OCT 31 2011

COZ030>051-011200-
JACKSON COUNTY BELOW 9000 FEET-WEST JACKSON AND WEST GRAND
COUNTIES ABOVE 9000 FEET-GRAND AND SUMMIT COUNTIES BELOW 9000
FEET-SOUTH AND EAST JACKSON/LARIMER/NORTH AND NORTHEAST GRAND/
NORTHWEST BOULDER COUNTIES ABOVE 9000 FEET-SOUTH AND SOUTHEAST
GRAND/WEST CENTRAL AND SOUTHWEST BOULDER/GILPIN/CLEAR CREEK/
SUMMIT/NORTH AND WEST PARK COUNTIES ABOVE 9000 FEET-LARIMER AND
BOULDER COUNTIES BETWEEN 6000 AND 9000 FEET-JEFFERSON AND WEST
DOUGLAS COUNTIES ABOVE 6000 FEET/GILPIN/CLEAR CREEK/NORTHEAST PARK
COUNTIES BELOW 9000 FEET-CENTRAL AND SOUTHEAST PARK COUNTY-LARIMER
COUNTY BELOW 6000 FEET/NORTHWEST WELD COUNTY-BOULDER AND JEFFERSON
COUNTIES BELOW 6000 FEET/WEST BROOMFIELD COUNTY-NORTH DOUGLAS
COUNTY BELOW 6000 FEET/DENVER/WEST ADAMS AND ARAPAHOE COUNTIES/
EAST BROOMFIELD COUNTY-ELBERT/CENTRAL AND EAST DOUGLAS COUNTIES
ABOVE 6000 FEET-NORTHEAST WELD COUNTY-CENTRAL AND SOUTH WELD
COUNTY-MORGAN COUNTY-CENTRAL AND EAST ADAMS AND ARAPAHOE COUNTIES-
NORTH AND NORTHEAST ELBERT COUNTY BELOW 6000 FEET/NORTH LINCOLN
COUNTY-SOUTHEAST ELBERT COUNTY BELOW 6000 FEET/SOUTH LINCOLN
COUNTY-LOGAN COUNTY-WASHINGTON COUNTY-SEDGWICK COUNTY-PHILLIPS
COUNTY-
1043 AM MDT MON OCT 31 2011

...WINTER STORM WATCH IN THE MOUNTAINS AND PARTS OF THE NORTHEAST
PLAINS FOR TUESDAY NIGHT AND WEDNESDAY MORNING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHEAST AND NORTH CENTRAL
COLORADO.

.DAY ONE...TODAY AND TONIGHT

NO HAZARDOUS WEATHER IS EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...TUESDAY THROUGH SUNDAY

A STRONG STORM SYSTEM WILL MOVE OVER THE STATE TUESDAY NIGHT...
BRINGING POSSIBLY HEAVY SNOW TO THE MOUNTAINS AND FOOTHILLS AND SNOW
AND GUSTY WINDS TO THE NORTHEAST COLORADO PLAINS.  MOUNTAIN AREAS
MAY RECEIVE A FOOT OF NEW SNOW BEFORE THE STORM MOVES OUT OF THE
STATE WEDNESDAY AFTERNOON.  ON THE PLAINS...GUSTY NORTH WINDS WILL
DEVELOP BEHIND A COLD FRONT THAT CROSSES THE AREA TUESDAY
AFTERNOON.  AREAS OF BLOWING AND DRIFTING SNOW ACROSS THE PLAINS MAY
CREATE DANGEROUS DRIVING CONDITIONS TUESDAY NIGHT AND WEDNESDAY
MORNING.

DRY WEATHER AND WARMER TEMPERATURES WILL RETURN ON THURSDAY AND
FRIDAY AS HIGH PRESSURE BUILDS OVER THE REGION.  ANOTHER STORM IS
EXPECTED TO MOVE OVER THE REGION ON SATURDAY WITH ADDITIONAL SNOW
POSSIBLE IN THE MOUNTAINS AND ON THE PLAINS.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED TODAY OR TONIGHT.

GIMMESTAD/COOPER