AREA FORECAST DISCUSSION
NWS SEATTLE WA
AFDSEW 730 PM PST SAT MAR 8 2003
.SYNOPSIS...A WARM FRONT WILL MOVE THROUGH THE REGION OVERNIGHT.
CANADIAN AIR OVER MAINLY WHATCOM COUNTY WILL KEEP LIGHT SNOW FALLING
THERE UNTIL JUST AFTER MIDNIGHT...AND THEN A RAPID WARM UP AND CHANGE
TO RAIN WILL OCCUR. THE MAIN FRONT WILL CROSS THE AREA SUNDAY
MORNING...WITH A MUCH MILDER AIR MASS. AFTER SHOWERS FOR THE FIRST
PART OF THE WEEK...A SERIES OF RATHER STRONG SYSTEMS WILL BRING
PERIODS OF WIND AND RAIN STARTING LATE TUESDAY.
.DISCUSSION...THE CD FRASER AIR IS ACTUALLY QUITE DEEP AS SEEN ON
ACARS SOUNDINGS OUT OF VANCOUVER. KBLI-WILLIAMS LAKE GRADIENT IS
-13.7MB AT 7PM THIS EVENING...SO OUTFLOW WILL CONTINUE TIL A LITTLE
AFTER MIDNIGHT WHEN THE MODELS SHOW THE SLIES TAKING OVER. THE LOW
TRACKS TO THE NRN PTN OF VRILS...AND THE SLIES ARE CLEARLY SHOWN IN
THE MM5 OVER THEN NRN INLAND WATERS NWD THRU THE STRAIT OF GEORGIA
JUST AFTER MIDNIGHT. I WILL UPDATE THE FCSTS NOW TO ISSUE A SNOW
ADVISORY FOR WHATCOM COUNTY AND THE SAN JUANS. AN INCH OR TWO SEEMS
LIKE AN OKAY BET...THO AS FAR AS THE ISLANDS PRETTY MUCH ON THE HILLS
AWAY FROM THE WATER. THERE IS NOT A LOT OF PCPN ON RADAR...BUT WHAT
HAPPENS TO BE THERE AS I TYPE THIS SEEMS TO BE STUCK ON THE OUTFLOW
BOUNDARY...SO AM COUNTING ON THE WMFNT STALLING A BIT THERE TIL
MIDNITE. ELSEWHERE...THERE WAS SOME WET SNOW AROUND PORT ANGELES THIS
EVENING...AND EVEN WHIDBEY ISLAND...THE CURRENT WORDING FOR LESS THAN
AN INCH IS JUST FINE. McFarland
UIL ++76 SEA ++76 OLM ++76
.KSEW...SNOW ADVISORY FOR WESTERN WHATCOM COUNTY AND THE SAN JUANS.
.GALE WARNING COAST AND W ENTRANCE STRAIT OF JUAN DE FUCA.
.SMALL CRAFT ADVISORY NORTH INLAND WATERS.
.SNOW ADVISORY TONIGHT AND EARLY SUN OLYMPICS AND WEST
SLOPES CENTRAL AND NORTH CASCADES AND PASSES.
.EXTREME AVALANCHE HAZARD CASCADES AND OLYMPICS TONIGHT AND
SUN MORNING.
.KATX...VCP21/CSR21...OPERATIONAL.
$$