WFO Denver/Boulder

PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE BOULDER CO
600 AM TUE OCT 25 2011

...WHAT DOES THAT WARNING MEAN...

THE NATIONAL WEATHER SERVICE WILL INFORM YOU ABOUT DEVELOPING HAZARDOUS 
WEATHER WITH OUTLOOKS...WATCHES...WARNINGS AND ADVISORIES.  Now is the time to 
get ready for winter weather...DURING THIS COLORADO WINTER WEATHER PREPAREDNESS WEEK.

THIS LIST HAS THE WATCH...WARNING AND ADVISORY CRITERIA FOR COLORADO
EAST OF THE CONTINENTAL DIVIDE.  SAVE THIS LIST FOR USE THROUGHOUT THE
WINTER. CRITERIA WEST OF THE CONTINENTAL DIVIDE WILL BE PROVIDED TODAY
BY THE GRAND JUNCTION OFFICE.  

HEAVY SNOW CRITERIA FOR EASTERN AND CENTRAL COLORADO ARE
REPRESENTATIVE VALUES APPLIED OVER A LARGE GEOGRAPHIC AREA...

     MOUNTAINS...8 INCHES OF SNOW IN 12 HOURS
                 12 OR MORE INCHES IN 24 HOURS.  
   
     LOWER ELEVATIONS...6 INCHES OF SNOW IN 12 HOURS
                 8 OR MORE INCHES IN 24 HOURS. 


WINTER WATCHES AND WARNINGS...           

A WINTER STORM WATCH IS ISSUED WHEN WINTER STORM CONDITIONS ARE
POSSIBLE WITHIN THE NEXT 3 DAYS...BUT THE TIMING...INTENSITY...
OR OCCURRENCE MAY STILL BE UNCERTAIN.   

A WINTER STORM WARNING IS ISSUED WHEN HEAVY SNOW IS OCCURRING OR
WILL DEVELOP IN THE NEXT 36 HOURS.   THE HEAVY SNOW MAY BE 
ACCOMPANIED BY WIND GREATER THAN 15 MPH AND BLOWING SNOW.  

A BLIZZARD WATCH IS ISSUED WHEN BLIZZARD CONDITIONS ARE POSSIBLE IN THE NEXT 
12 TO 36 HOURS.  

A BLIZZARD WARNING IS ISSUED IN LOWER ELEVATIONS WHEN THE FOLLOWING CONDITIONS 
ARE    
       EXPECTED FOR AT LEAST 3 HOURS...
       SUSTAINED WINDS OF 35 MPH OR GREATER.
       CONSIDERABLE FALLING AND OR DRIFTING SNOW LOWERING           
       VISIBILITIES TO LESS THAN 1/4 MILE.

A BLIZZARD WARNING IS ISSUED IN THE MOUNTAINS AND FOOTHILLS FOR THE CONDITIONS 
ABOVE...BUT WITH WINDS IN EXCESS OF 50 MPH AT THE HIGHER ELEVATIONS.  

A WIND CHILL WATCH IS ISSUED WHEN WIND CHILL WARNING CRITERIA ARE POSSIBLE IN 
THE NEXT 12 TO 36 HOURS.   

A WIND CHILL WARNING IS ISSUED FOR WIND CHILLS OF AT LEAST MINUS 25 DEGREES ON 
THE PLAINS...AND MINUS 35 DEGREES IN THE MOUNTAINS AND FOOTHILLS. 

A FREEZE WATCH IS ISSUED WHEN FREEZE CONDITIONS ARE POSSIBLE IN THE NEXT 
12 TO 36 HOURS.  

A FREEZE WARNING IS ISSUED DURING THE GROWING SEASON WHEN WIDESPREAD 
TEMPERATURES ARE EXPECTED TO DROP TO BELOW 32 DEGREES.  

A HIGH WIND WATCH IS ISSUED WHEN HIGH WIND CONDITIONS ARE EXPECTED TO 
DEVELOP IN THE NEXT 12 TO 36 HOURS.  SOMETIMES IT WILL BE ISSUED LATE IN THE 
FIRST FORECAST PERIOD...6 TO 12 HOURS...IF THE POTENTIAL FOR HIGH WIND 
EXISTS...BUT THERE IS SOME UNCERTAINTY.  

A HIGH WIND WARNING IS ISSUED FOR THE FOLLOWING CONDITIONS... 
       SUSTAINED WINDS OF 50 MPH FOR AT LEAST 1 HOUR OR GUSTS TO 75 MPH 
       FOR ANY DURATION IN THE MOUNTAINS AND FOOTHILLS.              

       SUSTAINED WINDS OF 40 MPH FOR AT LEAST 1 HOUR...OR GUSTS TO 58 MPH 
       FOR ANY DURATION AT LOWER ELEVATIONS AWAY FROM THE FOOTHILLS. 
         
				
ADVISORIES...

A WINTER WEATHER ADVISORY IS ISSUED...

       WHEN GENERAL SNOW ACCUMULATIONS ARE EXPECTED
 BETWEEN 4 AND 8 INCHES IN 12 HOURS IN THE MOUNTAINS AND FOOTHILLS
 ...AND BETWEEN 3 AND 6 INCHES IN 12 HOURS AT LOWER ELEVATIONS.  

       WHEN FALLING SNOW IS ACCOMPANIED BY BLOWING SNOW TO CAUSE 
       TRAVEL PROBLEMS DUE TO LOWER VISIBILITIES.                                

       WHEN WIND BLOWN SNOW WILL OCCASIONALLY 
       REDUCE VISIBILITIES AND CREATE A HAZARD FOR TRAVELERS.  

       FOR FREEZING DRIZZLE OR A MIX OF PRECIPITATION TYPES...SUCH AS 
       SNOW AND SLEET...THAT WILL IMPACT TRAVEL CONDITIONS.

A DENSE FOG ADVISORY IS ISSUED WHEN FOG WILL REDUCE VISIBILITIES TO 1/4 MILE 
OR LESS. 

A WIND CHILL ADVISORY IS ISSUED ON THE PLAINS WHEN WIND AND TEMPERATURE
COMBINE TO PRODUCE WIND CHILL VALUES OF MINUS 18 DEGREES TO MINUS 25 DEGREES.  

A WIND CHILL ADVISORY IS ISSUED FOR THE MOUNTAINS AND FOOTHILLS WHEN WIND AND 
TEMPERATURE COMBINE TO PRODUCE WIND CHILL VALUES OF MINUS 25 DEGREES.  

A FROST ADVISORY IS ISSUED DURING THE GROWING SEASON WHEN TEMPERATURES
ARE EXPECTED TO DROP TO BETWEEN 32 AND 35 DEGREES ON CLEAR CALM NIGHTS. 


A BLOWING DUST ADVISORY IS ISSUED WHEN BLOWING DUST REDUCES VISIBILITIES 
TO BETWEEN A QUARTER OF A MILE AND A MILE.   

THIS WEEK IS WINTER WEATHER PREPAREDNESS WEEK IN COLORADO.  PUBLIC INFORMATION 
STATEMENTS WILL BE ISSUED THROUGHOUT THE WEEK TO GIVE SAFETY INFORMATION...AND 
HELP YOU KNOW HOW TO RESPOND WHEN WINTER WEATHER THREATENS.

$$
GLANCY   


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