Cold & Hot Air Clash
Posted by JAC on 3/28/2010, 7:17 am
EXTENDED FORECAST DISCUSSION
NWS HYDROMETEOROLOGICAL PREDICTION CENTER CAMP SPRINGS MD
213 PM EDT SAT MAR 27 2010

VALID 12Z TUE MAR 30 2010 - 12Z SAT APR 03 2010

A SIGNIFICANT COOLING IN STORE FOR WRN CONUS WITH THE DEEP WRN
TROF AND CLOSED LOW DROPPING SOUTHEAST AND SWINGING THRU THE
SOUTHWEST ALONG WITH WET CONDITIONS OVER THE PAC NORTHWEST
SHIFTING SOUTHWARD THRU CA AND EWD THRU THE ROCKIES AND INTO THE
NRN PLAINS MID-LATE WEEK. WIDESPREAD ROCKY MTN SNOW EVENT. SECOND
SIG MOISTURE SURGE ALONG AND BEHIND A COLD FRONT INTO THE PAC
NORTHWEST DAY DAY 6-7. SLOW MOVING N-S FRONTAL BOUNDARY THRU THE
CENTRAL PLAINS NWD INTO THE UPPER MS VALLEY LIKELY TO BE THE FOCUS
OF SOME HVY RAINFALL AND STRONG CONVECTION FRI INTO SUNDAY WITH A
STRONG BAROCLINIC CLASH OF A COLD TROF AND SIGNIFICANT WARM
ADVECTION AHEAD OF IT THRU THE SRN PLAINS ALONG WITH GOOD INFLOW
OF GULF MOISTURE SPREADING WELL NWD OVER A PERIOD OF DAYS.

CONSIDERABLE WARMING FOLLOWING AS MID LEVEL HTS RISE AND STRONG WARM
ADVECTION OCCURS FROM THE MS VALLEY EWD TO THE EAST COAST BY THE
WEEKEND. FIRST TRUE WIDESPREAD WARMING EVENT OF THE SPRING TO
OCCUR LATE WEEK INTO EASTER WEEKEND. GREATEST TEMPERATURE
ANOMALIES TO OCCUR FROM NEW ENG TO THE GREAT LAKES REGION WHERE
H850 TEMP ANOMALIES ARE IN THE RANGE OF THREE STANDARD DEVIATIONS
ABOVE NORMAL YIELDING A LARGE AREA OF TEMPS IN THE 60-70S OVER
THIS AREA WITH UPPER 70S-LOW 80S COMMON SOUTHWARD FROM THE
NORTHEAST TO OH VALLEY AND SOUTH TO THE GULF COAST.    
RAUSCH/ROSENSTEIN


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May see a big system move across Conus around first weekend in April - JAC, 3/26/2010, 7:27 am
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