Winter Storm in Vermont, April 5, 2003

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
347 AM EST SAT APR 5 2003

QUICK UPDATE TO READJUST ADVISORY/WARNING BREAK-UPS. WILL OPT TO
DOWNGRADE WARNING FOR BURLINGTON AREA AND INCLUDE W/NORTHERN CVLY
ZONES. ELSEWHERE NO ADJUSTMENTS. PREVIOUS DISCUSSION BELOW.

.BTV...WINTER STORM WRNG TODAY VTZ003-004-006>012-NYZ029>031-034-035.
       WINTER WEATHER ADVSY TODAY VTZ001-002-005-NYZ026>028.

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CURRENTLY...LARGE SWATH OF LIGHT TO MODERATE SNOW OVERSPREADING MUCH
OF CWA FROM THE SW...AND MOST AREAS SHOULD FINALLY GET IN ON THE
ACCUMULATING SNOW ACTION THAT SC VT HAS SEEN OVER THE PAST 36 HRS.
ONLY EXCEPTION IS ALONG THE IMMEDIATE CANADIAN BORDER...ESP SLV
WHERE DEEP E TO NE FLOW CONTINUES TO PUMP IN MUCH DRIER AIR AT THE
LOW LEVELS. TEMPS AREA WIDE IN THE 20S WITH A FEW UPPER TEENS NOTED
ACROSS THE DACKS.

TODAY/TONIGHT...GUIDANCE HAS FINALLY COME IN LINE SHOWING BOTH
PRIMARY SFC LOW AND UPPER LEVEL SUPPORT LIFTING NE ACROSS AREA
TODAY...WITH TRACK ALONG SLV. WITH THIS SCENARIO...WARMER 850-750
HPA AIR SHOULD NOT HAVE A PROBLEM ADVECTING ACROSS REGION LATER THIS
MORNING AND INTO THE AFTERNOON HOURS. THUS ANY SNOW WILL CHANGE TO
FZRA/PL LATER THIS MORNING...AND WITH DECENT S TO SE BNDRY LYR
FLOW...PRECIP MAY EVEN CHANGE TO RAIN FOR AWHILE ACROSS CVLY AND SC
VT. QPF SHOULD SLACKEN OFF CONSIDERABLY THIS AFTERNOON DUE TO
UNSATURATED SNOW GROWTH LYR LEADING TO MORE DZ/FZDZ CONDS...AND
IMPRESSIVE DRY SLOT EVOLVING ACROSS OHIO VLY ADVECTING OVER REGION.
WILL KEEP CURRENT WARNINGS IN PLACE...BUT WILL DOWNGRADE SLV AND
FAR NORTHERN CVLY ZONES TO ADVISORY AS MAIN SLUG OF ACCUMULATING
SNOWS THIS MORNING WILL MISS THE AREA...AND MUCH OF QPF TODAY WILL
BE OF MIXED P-TYPE AS DISCUSSED ABOVE. LOW PASSES TO THE NORTH
TONIGHT WITH WINDS BACKING TO NW AS FROPA EXPECTED SOMETIME DURING
THE MID TO LATE EVENING HOURS.

SUNDAY/SUNDAY NT...SENSIBLE WX QUIETING DOWN WITH MORNING FL/MTN
SHSN ENDING AND ALL AREAS SEEING SOME AFTERNOON SUN. DRIER AIR
ALONG WITH RELATIVELY STEEP BNDRY LYR LAPSE RATES TO 850 HPA SHOULD
PROMOTE AMPLE MIXING. CENTER OF IMPRESSIVE EARLY SPRING 1040 ARCTIC
HIGH CONTINUES TO NOSE INTO REGION. WITH CLEARING SKIES AND FRESH
SNOW COVER HAVE UNDERCUT GUIDANCE MINS SOMEWHAT HERE. HOWEVER HIGH
CLOUDS WILL BE ON THE INCREASE LATE SO HAVE NOT CUT VALUES BY MORE
THAN 2 TO 5 DEGREES HERE.

MONDAY/TUE...LATEST GUIDANCE CONTINUES TO SHOW LARGE ANTICYCLONE
SLUGGISHLY MOVING EASTWARD TO A POSITION JUST NORTH OF REGION. ETA
HAS BACKED OFF SIGNIFICANTLY ON SNOW CHANCES/QPF FOR
AREA...SUGGESTING DRIER POLAR AIR IN THE LOWER LAYERS WILL INHIBIT
PRECIPITATION REACHING SFC. ALSO ETA SOLN SLOWER...AND SPAWNS
COASTAL CYCLOGENESIS OFF CAPE HATTERAS FURTHER SOUTH THAN GFS
SOLN...WHICH HANGS ON TO PRIMARY OHIO VLY SFC LOW LONGER...AND HAS
COASTAL EVOLUTION NEAR THE VA CAPE. CLIMATOLOGY HAS SHOWN THAT THE
OLD PRIMARY LOW OFTEN HANGS ON LONGER THAN GUIDANCE OFTEN
SUGGESTS...AND WILL GO WITH MORE OF A BLEND HERE. THUS WILL TRIM
POPS BACK SLIGHTLY ACROSS NORTHERN ZONES...BUT CONTINUE IDEA OF -SN
OVERSPREADING AREA LATER IN THE DAY. ANY LEFTOVER SNOW/SHSN TAPERS
OFF MONDAY NT/EARLY TUE AS RATHER BROAD UPPER TROUGH PASSES AREA.
TEMPS CONTINUED WELL BELOW NORMAL.

AFTERWARDS...NO OTHER CHANGES PLANNED HERE. WELCOMED CHANGES ARE
FINALLY ON THE HORIZON HOWEVER...WITH COLDER CANADIAN AIR RETREATING
NORTHWARD...AND TEMPS REBOUNDING LATER IN THE WEEK TO SEASONAL TO
ABOVE NORMAL READINGS WITH HIGH PRESSURE IN CONTROL.

.BTV...WINTER STORM WRNG TODAY VTZ003>012-NYZ029>031-034-035.
       WINTER WEATHER ADVSY TODAY VTZ001-002-NYZ026>028.

JMG

NYZ026>031-034-035-VTZ001>012-051315-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BURLINGTON VT
627 AM EST SAT APR 5 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHERN VERMONT
AS WELL AS NORTHERN NEW YORK.

.DAY ONE...TODAY

A LOW PRESSURE AREA OVER THE EASTERN GREAT LAKES EARLY TODAY WILL
REDEVELOP OVER SOUTHERN NEW ENGLAND LATE TODAY...AND THEN MOVE
NORTHEAST INTO THE CANADIAN MARITIMES LATE TONIGHT. SNOW WILL CHANGE
TO SLEET AND FREEZING RAIN AROUND THE REGION BY MIDDAY...AND MAY
BRIEFLY CHANGE TO RAIN THIS AFTERNOON. AN ADDITIONAL SNOW
ACCUMULATION OF 1 TO 2 INCHES IS POSSIBLE THIS MORNING BEFORE A
CHANGEOVER. SOME LIGHT ICING IS POSSIBLE. FREEZING RAIN OR DRIZZLE
IS EXPECTED TO CONTINUE INTO EARLY THIS EVENING...AND THEN CHANGE TO
SNOW SHOWERS OVERNIGHT...WITH LITTLE ADDITIONAL SNOW ACCUMULATION
EXPECTED.

.DAYS TWO THROUGH SEVEN...

A LOW PRESSURE AREA MOVING NORTHEAST UP THE OHIO VALLEY ON MONDAY
WILL REDEVELOP ALONG THE MID ATLANTIC COAST MONDAY AFTERNOON...
AND THEN MOVE NORTHEAST AND BE LOCATED SOUTHEAST OF CAPE COD BY EARLY
TUESDAY MORNING. THIS LOW PRESSURE AREA WILL BRING A CHANCE OF SNOW
TO THE REGION LATE MONDAY AFTERNOON...AND CONTINUING INTO MONDAY
NIGHT...AND THEN ENDING ON TUESDAY.

.SPOTTER CALL TO ACTION STATEMENT...

SPOTTERS ARE REQUESTED TO REPORT SNOWFALL AMOUNTS AND ANY REPORTS OF
ICE ACCUMULATION TO THE NATIONAL WEATHER SERVICE IN BURLINGTON.