From NWS STRONG NEGATIVE DIFFERENTIAL VORTICITY ADVECTION LATER IN THE NIGHT SO TRANSITIONED TO FLURRIES WELL AFTER MIDNIGHT. MAIN FORCUS FOR THIS PERIOD IS TEMPERATURES AND WIND CHILLS. CORE OF COLDEST AIR SWEEPS THROUGH LATE SUNDAY NIGHT THROUGH MONDAY NIGHT AS TEMPERATURES AT 85H FALL TO -26 TO -28C. VERY SLIGHT MODIFICATION BY 12Z/TUE. LINGERING PRESSURE GRADIENT SHOULD PREVENT WINDS FROM FALLING BELOW 4 KNOTS MOST AREAS THROUGH TUESDAY MORNING. HOWEVER SOME UNCERTAINTY REGARDING HOW FAR TEMPERATURES WILL FALL MONDAY MORNING AND HOW LOW THEY REMAIN THROUGH THE DAYLIGHT HOURS. WIND CHILL ADVISORIES/WARNINGS WILL BE NEEDED FOR THE PERIOD FOR LATER SUNDAY NIGHT INTO TUESDAY...BUT UNCERTAIN AT THIS POINT WHEN TO CARRY CHANGEOVER FROM WIND CHILL ADVY TO WARNING. STILL LOOKS LIKE THE COLDEST PERIOD WILL BE MONDAY NIGHT INTO TUESDAY MORNING. PER COORDINATION WITH OTHER WI NWS OFFICES...WL CONTINUE WIND CHILL WATCH AND EXPC TRANSITION TO ADVY/WARNING TNGT OR EARLY SUN. WIND CHILLS LIKELY TO REMAIN AT WIND CHILL ADVY CRITERIA TUE INTO TUE NGT. CIPS ANALOG VALID 12 HOURS EITHER SIDE OF 12Z/27 SHOWS A 30 TO40 PERCENT CHANCE FOR WIND CHILLS LESS THAN -30. BY 12Z/28...THE PERCENTAGE INCREASES TO 40 TO 50 PERCENT.
Posted on: Sun, 26 Jan 2014 01:54:16 +0000
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