177
FOCN45 CWWG 072000
SIGNIFICANT WEATHER DISCUSSION ISSUED BY THE PRAIRIE AND ARCTIC STORM
PREDICTION CENTRE OF ENVIRONMENT CANADA AT 2:00 PM CST SATURDAY
NOVEMBER 7 2009.
WATCHES/WARNINGS..GALE WARNING FOR WEST CLYDE NORTHERN HALF. STRONG
WIND WARNING FOR THE SOUTHERN MANITOBA LAKES. BLIZZARD WARNING IN
KUGLUKTUK.
DISCUSSION - ZONAL FLOW RETURNING ACROSS PRAIRIES AS WEAKENING RIDGE
SLIDES INTO ONTARIO. MODERATE N-S GRADIENT BEHIND LOW MOVING INTO
HUDSON BAY. NORTHERN MB CLEARING SLOWLY. CHURCHILL 10CM EXPECTED
NEXT 24 HR. STILL SLIGHT RISK OF FZ PCP ACROSS NORTHEAST MB.
STILL UNSEASONABLE BUT NOT RECORD-BREAKING HIGH TEMPERATURES OVER
SOUTHERN SK AND MB.
ERN ARCTIC - COLD UPPER LOW CONTINUES TO SWIRL OVER FOXE BASIN
GIVING NEAR BLIZZARD EXPECTED TO EASE OVERNIGHT ALTHOUGH MODEL
UNRELIABLE THERE. PANGNIRTUNG AGAIN HAS 24 HR SNOWFALL ACCUMULATIONS
NEAR WARNING CRITERIA. KIVALLIK COAST NEAR BLIZZARD WILL PERSIST
OVERNIGHT IN NORTHERN REGIONS BETWEEN RIDGE BUILDING IN ACROSS GJOA
AND LOW MOVING INTO HUDSON BAY. SIGNIFICANT SNOWS EXPECTED OVER THE
SOUTHERN COAST.
WRN ARCTIC - SURFACE LOW SITTING OVER THE NORTH SLAVE REGION AT 18Z
WITH A SLOW NORTH-NORTHWEST PROGRESSION. HEAVY SNOW WRAPPED AROUND
THE STACKED UPPER LOW GIVING ACCUMULATIONS OF 5 TO 10 NEAR GREAT
BEAR LAKE. THAT SAME BAND OF SNOW MOVED INTO KUGLUKTUK EARLY THIS
MORNING GIVING BLIZZARD CONDITIONS. DURATION IS HIGHLY DEPENDENT ON
SNOWFALL. NEAR 10 CM FORECAST FOR TODAY SHOULD KEEP THEM GENERALLY
BELOW 1 KM HOWEVER TONIGHT SNOW WILL BEGIN TO TAPER OFF. END TIMING
IS UNCERTAIN AND EVEN 6 HOUR DURATION MAY BE TRICKY DUE TO WIND
CRITERIA FOR THE TRUE BLIZZARD. SNOW CONTINUES TO FALL IN PAULATUK.
WARNING WILL BE ENDED THIS AFTERNOON AS SIGNIFICANT AMOUNTS ARE
UNLIKELY.
ALBERTA - STRONG ZONAL FLOW ACROSS ALBERTA WILL GIVE STRONG WESTERLY
WINDS TO SOUTHERN SECTIONS ONCE AGAIN. WINDS ALOFT ~15 KNOTS WEAKER
IN COMPARISON TO YESTERDAY. ALSO LACKING THE COLD AIR ADVECTION THAT
WAS PRESENT WITH THE WARM FRONT HOWEVER A FEW AREAS WILL BE
MONITORED. WXN COULD BE CLOSE EARLY THIS AFTERNOON AS WELL AS
SOUTHERN SECTIONS OF THE BROOKS REGION WHERE A SLIGHT ANTICYCLONIC
CURVATURE SIGNATURE IS PRESENT COMING OUT OF THE LEE TROUGH. LATE
TOMORROW A STRONG TROUGH SETS UP AGAIN WITH STRONG WINDS ON THE
SOUTHERN FOOTHILLS. 60G80 KM/H SEEMS LIKELY GIVEN THE CURRENT
GUIDANCE.
END/BURFORD/WIELKI
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