Public Information Statement
Issued by NWS Seattle/Tacoma, WA

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NOUS46 KSEW 200137
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PUBLIC INFORMATION STATEMENT
NATIONAL WEATHER SERVICE SEATTLE WA
540 PM PST WED NOV 19 2014

...WIND AND SNOW ADVISORY AND WARNING CRITERIA...

LAST WEEK...IT WAS WINDY IN SOME PARTS OF WESTERN WASHINGTON. THE
NATIONAL WEATHER SERVICE IN SEATTLE HAD WIND ADVISORIES AND HIGH
WIND WARNINGS FORECAST FOR THESE WINDY LOCATIONS. BUT WHAT IS THE
DIFFERENCE BETWEEN A WIND ADVISORY AND A HIGH WIND WARNING?

A WIND ADVISORY IS FOR WIND SPEEDS OF 30 TO 39 MPH SUSTAINED AND/OR
GUSTS OF 45 TO 57 MPH...JUST UNDER THE HIGH WIND WARNING MINIMUM
CRITERIA. THE HIGH WIND WARNING CRITERIA STARTS AT 40 MPH SUSTAINED
AND/OR GUSTS OF 58 MPH OR GREATER. WIND SPEEDS MEASURED IN THOSE
ADVISORY AND WARNING LOCATIONS LAST WEEK ENDED UP CLOSE TO WHAT WAS
FORECAST.

STRONG EASTERLY WINDS ARE NOT UNUSUAL IN WESTERN WASHINGTON BUT ALSO
DO NOT OCCUR VERY OFTEN. IN ADDITION AS A RESULT OF STRONG OFFSHORE
FLOW FROM EASTERN WASHINGTON TO THE PACIFIC...THEY BLEW FOR AN
EXTENDED TIME PERIOD - FROM TUESDAY INTO THURSDAY. THE WINDS KNOCKED
DOWN WEAKER TREES AND LIMBS RESULTING IN SOME POWER OUTAGES AND
DEBRIS OVER ROADWAYS.

NOW YOU KNOW WHAT THE WIND SPEED CRITERIA IS FOR A WIND ADVISORY AND
A HIGH WIND WARNING. HOW ABOUT CRITERIA FOR SNOW AMOUNTS?

FIRST LETS ADDRESS WESTERN WASHINGTON LOWLAND SNOW AMOUNTS. A WINTER
WEATHER ADVISORY FOR SNOW IS ONE TO THREE INCHES WITHIN 12 HOURS.
FOR A WINTER STORM WARNING...THE FORECAST INVOLVES FOUR INCHES OR
MORE WITHIN 12 HOURS...AND CAN ALSO INCLUDE ICE AND STRONG WINDS.

IN THE MOUNTAINS WHERE SNOW IS FAR MORE COMMON...THE CRITERIA
INVOLVES HIGHER AMOUNTS. A WINTER WEATHER ADVISORY MEANS 6 TO 11
INCHES WITHIN 12 HOURS AND A WINTER STORM WARNING MEANS A FOOT OR
MORE WITHIN 12 HOURS.

NOW YOU KNOW THESE WIND AND SNOW CRITERIA AND CAN CHALLENGE YOUR
FRIENDS AND FAMILY WITH YOUR NEW KNOWLEDGE. COMBINED WITH WEATHER
OUTLOOKS AND WATCHES IN THE DAYS LEADING TO A WIND OR SNOW EVENT...
THESE HAZARDOUS WEATHER FORECAST STATEMENTS PROVIDE YOU NOTICE AND
LEAD TIME TO PREPARE IN ADVANCE. HAVE A SAFE WINTER SEASON!

$$

BUEHNER






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