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A Blizzard Warning is an advisory issued by the National Weather Service of the United States which means winds of 35 mph (56 km/h) or greater, mixed with heavy snow is forecasted for a period of 3 hours or more. A blizzard tends to reduce visibilities to 1/4 of a mile (400 m) or less. In most cases temperatures below 20°F is an additional criteria for blizzard classification. A Severe Blizzard Warning is a variety issued is some cases of winds above 45 mph/72 km/h and temperatures below 10°F/-12°C. Many local weather offices will activate the Emergency Broadcast System and broadcast the alarm tone on relevant NOAA Weather Radio stations for both varieties of warning.
[edit] Example of a blizzard warning
URGENT - WINTER WEATHER MESSAGE
NATIONAL WEATHER SERVICE FAIRBANKS AK
221 PM AST SUN DEC 9 2007
.A STORM SYSTEM MOVING NORTH OVER THE CENTRAL BERING SEA WILL MOVE
TO SOUTHWEST OF SAINT LAWRENCE ISLAND MONDAY AFTERNOON. THE STORM
WILL BRING SNOW AND EAST WINDS OF 30 TO 45 MPH TONIGHT OVER MUCH
OF WESTERN ALASKA FROM THE YUKON DELTA TO THE SEWARD PENINSULA
TONIGHT. WINDS WILL DIMINISH EARLY MONDAY BUT SNOW IS EXPECTED TO
CONTINUE THROUGH MONDAY AFTERNOON.
AKZ214-100600-
/X.CON.PAFG.BZ.W.0019.071210T0000Z-071210T1400Z/
YUKON DELTA-
INCLUDING...EMMONAK...MOUNTAIN VILLAGE...ALAKANUK...KOTLIK...
PILOT STATION...ST MARYS...SCAMMON BAY...NUNAM IQUA...
PITKAS POINT
221 PM AST SUN DEC 9 2007
...BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 AM AST MONDAY...
A BLIZZARD WARNING REMAINS IN EFFECT UNTIL 5 AM AST MONDAY.
SNOW AND BLOWING SNOW WILL DEVELOP THIS AFTERNOON...AND ALONG
WITH EAST WINDS OF 25 TO 40 MPH....VISIBILITIES WILL BE REDUCED
TO NEAR ZERO AT TIMES UNTIL WINDS DIMINISH LATE TONIGHT.
A BLIZZARD WARNING MEANS SEVERE WINTER WEATHER CONDITIONS ARE
EXPECTED OR OCCURRING. BLOWING SNOW WITH STRONG WINDS AND
EXTREMELY POOR VISIBILITIES WILL CAUSE WHITEOUT CONDITIONS AND
MAKE ANY TRAVEL OR OUTDOOR ACTIVITY HAZARDOUS.
$$
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