080
FXCN01 CWHF 202015
KEY FORECAST POINTS:
- STRONG EAST TO NORTHEAST WINDS AND HEAVY SNOW TONIGHT.
- SNOW MIXED WITH ICE PELLETS SATURDAY MORNING TAPERING OFF TO
FLURRIES IN THE AFTERNOON.
SHORT-RANGE DISCUSSION FOR OPS AREA ALPHA AND THE ECHOES, CFB HALIFAX
PROPERTIES AND 12 WING SHEARWATER
PERIOD OF COVERAGE: 0600Z 20 DEC TO 0400Z 22 DEC.
MODEL DISCUSSION: USED RDPS/HRDPS.
CONFIDENCE: MODERATE TO HIGH.
COMMENTS/IMPACTS: A LOW-PRESSURE SYSTEM MOVING OFF THE EAST COAST OF
THE UNITED STATES WILL TRACK NORTHWARD TOWARD EASTERN NOVA SCOTIA
TONIGHT AND SATURDAY. THIS SYSTEM IS FORECAST TO BRING HEAVY SNOW
AND STRONG GUSTY NORTHEAST WINDS TO THE HALIFAX AREA TONIGHT.
SNOW IS FORECAST TO BEGIN THIS EVENING AND ALTHOUGH IT MAY BE
MIXED WITH RAIN AT TIMES AT ONSET, THAT WILL LIKELY BE SHORT LIVED.
BY MIDNIGHT THE SNOW IS EXPECTED TO BE HEAVY AT TIMES WITH THE
HIGHEST SNOWFALL RATES OVERNIGHT. BY ABOUT 0400 LOCAL SATURDAY, 15
TO 20 CM ARE FORECAST. AT THAT TIME SNOW IS EXPECTED TO BEGIN
MIXING WITH ICE PELLETS AND THE SNOW AND ICE PELLET MIX CONTINUES
SATURDAY MORNING BEFORE BEGINNING TO EASE EARLY SATURDAY AFTERNOON.
A FURTHER 5 CM OF SNOW AND ICE PELLETS ARE FORECAST ON SATURDAY.
SNOWFALL AMOUNTS MAY BE REDUCED SOMEWHAT IF THE CHANGE TO ICE
PELLETS BECOMES MORE SIGNIFICANT EARLY SATURDAY.
STRONG EASTERLY WINDS ARE FORECAST TO DEVELOP THIS EVENING AHEAD
OF THE LOW. AS THE LOW CONTINUES APPROACHING FROM THE SOUTH DURING
THE NIGHT, WINDS BACK TO MORE NORTHEAST AND FURTHER INCREASE TO
GUSTING GALE FORCE OVERNIGHT. AS THE LOW PASSES BY TO THE EAST OF
HALIFAX ON SATURDAY, WINDS BACK TO THE NORTH THEN NORTHWEST WITH
GUSTS EASING SLIGHTLY. GUSTY WINDS CONTINUE UNTIL SATURDAY EVENING
WHEN THE LOW LEAVES THE REGION. THE ABOVE STRONG WINDS MAY PRODUCE
REDUCED VISIBILITIES AT TIMES IN BLOWING SNOW.
LONG-RANGE DISCUSSION FOR OPS AREA ALPHA AND THE ECHOES, CFB HALIFAX
PROPERTIES AND 12 WING SHEARWATER
PERIOD OF COVERAGE: 0400Z 22 DEC TO 0400Z 25 DEC.
MODEL DISCUSSION: USED GDPS.
CONFIDENCE: MODERATE TO HIGH.
COMMENTS/IMPACTS: IN THE WAKE OF THE EARLY-WEEKEND STORM SYSTEM, A
LIGHT TO MODERATE NORTHWEST FLOW IS FORECAST FOR SUNDAY.
TEMPERATURES WILL FALL DURING THE DAY AS COLD AIR MOVES IN BEHIND
THE SYSTEM AND AN UNSTABLE AIR MASS LEADS TO CLOUD AND A FEW
FLURRIES.
MONDAY BRINGS A RIDGE OF HIGH PRESSURE APPROACHING FROM THE WEST,
ALLOWING THE LIGHT TO MODERATE NORTHERLY FLOW AHEAD OF IT TO EASE
LATER IN THE DAY.
COLD AIR TEMPERATURES CONTINUE.
A WEAK TROUGH IS FORECAST TO APPROACH FROM THE WEST ON TUESDAY.
WINDS BECOME A LIGHT TO MODERATE SOUTHWEST AND TEMPERATURES
RECOVER BACK UP TO NEAR ZERO. FLURRIES OR LIGHT SNOW SHOULD
ACCOMPANY THE TROUGH.
END/METOC-HFX
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