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 Post subject: Weather Advisory/Warning/Watch what do they mean.
Post Posted: Oct 22, 2010 8:27 pm 
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Location: 8900' ASL
Warning
A warning is issued when a hazardous weather or hydrologic event is occurring, imminent or likely. A warning means weather conditions pose a threat to life or property. People in the path of the storm need to take protective action.
Watch
A watch is used when the risk of a hazardous weather or hydrologic event has increased significantly, but its occurrence, location or timing is still uncertain. It is intended to provide enough lead time so those who need to set their plans in motion can do so. A watch means that hazardous weather is possible. People should have a plan of action in case a storm threatens and they should listen for later information and possible warnings especially when planning travel or outdoor activities.
Advisory
An advisory is issued when a hazardous weather or hydrologic event is occurring, imminent or likely. Advisories are for less serious conditions than warnings, that cause significant inconvenience and if caution is not exercised, could lead to situations that may threaten life or property.

Source: NOAA


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Post Posted: Sep 23, 2012 9:49 am 
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Location: Conifer Mountain
As our winter is approaching, here are specific definitions for eastern Colorado (east of the Divide) for various winter watches and warning:

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.

_________________
"Climatology is what you expect, Weather is what you get" - R. Heinlein.

"Sunshine is delicious, rain is refreshing, wind braces us up, snow is exhilarating; there is really no such thing as bad weather, only different kinds of good weather" - John Ruskin


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