FXUS61 KPBZ 160126
AFDPBZ
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PITTSBURGH PA
826 PM EST TUE DEC 15 2009
.SYNOPSIS...
LOW PRESSURE WILL MOVE NORTHEAST TO EASTERN CANADA BY WEDNESDAY.
COLDER AIR...ALONG WITH SCATTERED LAKE ENHANCED AND UPLAND SNOW
SHOWERS WILL PREVAIL THROUGH MIDWEEK. DRY AND COLD CONDITIONS WILL
PREVAIL FOR THURSDAY AND FRIDAY.
&&
.NEAR TERM /THROUGH WEDNESDAY/...
COLDER AIR WILL CONTINUE TO WORK ACROSS THE REGION IN THE WAKE
OF A COLD FRONT. UPPER LEVEL LOW PRESSURE WILL CROSS THE GREAT
LAKES TONIGHT...EXITING INTO THE CANADIAN MARITIMES WEDNESDAY.
LAKE ENHANCED/UPSLOPE SNOW SHOWERS WILL CAN BE EXPECTED ACROSS THE
DISTRICT WITH THE GREATEST THREAT OF ANY ACCUMULATION IN THE
NORTHWEST AND THE RIDGES WHERE A GENERAL ACCUMULATION OF AROUND AN
INCH CAN BE EXPECTED. FOR PIT SOUTH...ANY SNOW SHOWERS WILL BE
ISOLATED IN COVERAGE WITH LITTLE OR NO ACCUMULATION EXPECTED. SNOW
SHOWERS WILL DIMINISH FROM SOUTH TO NORTH WEDNESDAY AS HIGH
PRESSURE BUILDS IN. TEMPERATURES 5-10 DEGREES BELOW NORMAL WILL
PREVAIL. EXPECT WEST WINDS 10-15 MPH WITH GUSTS TO 25 MPH THROUGH
EARLY THIS EVENING...DIMINISHING SOME OVERNIGHT AND WEDNESDAY.
&&
.SHORT TERM /WEDNESDAY NIGHT THROUGH FRIDAY/...
HIGH PRESSURE WILL PREVAIL...WITH ANY RESIDUAL SNOW SHOWERS
ALONG THE I-80 CORRIDOR ENDING WEDNESDAY NIGHT. BELOW NORMAL
TEMPERATURES WILL CONTINUE...WITH ONLY A SLIGHT MODERATION FROM
WEDNESDAYS COLD READINGS.
&&
.LONG TERM /FRIDAY NIGHT THROUGH TUESDAY/...
BLEND OF GEFS AND ECMWF MODEL OUTPUT CONTINUE TO SHOW A COLD UPPER
LOW OVER EASTERN CANADA ROTATING A SHORT WAVE TROUGH SLOWLY THROUGH
THE GREAT LAKES THIS PERIOD. THIS SCENARIO WILL RESULT PERSISTENT
CLOUDS ACROSS THE UPPER OHIO VALLEY AND PERIODS OF INSTABILITY SNOW
SHOWERS ENHANCED BY LAKE AND MOUNTAIN EFFECTS WITH TEMPERATURES
GENERALLY 5-10 DEGF COLDER THAN NORMAL.
&&
.AVIATION /02Z WEDNESDAY THROUGH SUNDAY/...
COLD ADVECTION ACROSS LAKE ERIE WILL PRODUCE SCATTERED SNOW
SHOWERS FOR FKL/DUJ...AND ISOLATED SNOW SHOWERS FURTHER SOUTH
TONIGHT INTO WEDNESDAY. PREVAILING MVFR CONDITIONS ARE EXPECTED
TONIGHT...LIFTING TO VFR WEDNESDAY. A FEW PERIODS OF IFR WILL BE
POSSIBLE THIS EVENING NORTH IN HEAVIER SNOW SHOWERS.
A WEAK TROUGH DROPPING DOWN FROM THE NORTHEAST WILL PROVIDE FOR THE
POSSIBILITY OF MVFR CONDITIONS AGAIN WEDNESDAY NIGHT INTO
THURSDAY.
OTHERWISE...PREVAILING VFR CONDITIONS ARE EXPECTED THURSDAY NIGHT
THROUGH SUNDAY WITH SURFACE HIGH PRESSURE. HOWEVER...UPPER
TROUGHING DURING THIS PERIOD COULD LEAD TO A FEW PERIODS WITH
RESTRICTED CONDITIONS IN SNOW SHOWERS AS WAVES PASS THROUGH.
&&
.PBZ WATCHES/WARNINGS/ADVISORIES...
MD...NONE.
OH...NONE.
PA...NONE.
WV...NONE.
&&
$$
