Severe Thunderstorm Warning 42, NWS Burlington, VT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BURLINGTON VT
424 PM EDT WED JUN 27 2007

...SEVERE THUNDERSTORMS POSSIBLE THROUGH EARLY TONIGHT...

.SYNOPSIS...
A MOIST AND UNSTABLE AIR MASS COMBINED WITH AN APPROACHING COLD
FRONT WILL BRING SCATTERED SHOWERS AND THUNDERSTORMS TO THE NORTH
COUNTRY TONIGHT. SOME OF THESE STORMS COULD BE STRONG TO SEVERE. A
COOLER AND DRIER AIR MASS WILL BUILD INTO THE NORTH COUNTRY
FOLLOWING THE COLD FRONT...WITH TEMPERATURES BELOW SEASONAL LEVELS
ON FRIDAY...AND THROUGH THE WEEKEND.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
SEVERE THUNDERSTORM WATCH #457 CONTINUES IN EFFECT THROUGH 02Z FOR
ENTIRE CWA. HOT SFC TEMPERATURES ONCE AGAIN THIS AFTERNOON
AREAWIDE WITH 90 TO 95F READINGS IN VALLEY LOCATIONS AT 19Z. SFC
DEWPOINTS ARE GENERALLY IN THE MID 60S TO AROUND 70...CONTRIBUTING
TO MUCAPE VALUES AROUND 2000 J/KG. AIR MASS CONTINUES HAZY AND
HUMID THROUGH THIS EVENING WITH SUFFICIENT INSTABILITY FOR SVR
TSTMS. WEAK LARGE-SCALE FORCING AND MARGINAL H8-H5 LAPSE RATES
AROUND 6C/KM HAVE - THUS FAR - LIMITED COVERAGE OF CONVECTIVE
STORMS ACROSS THE CWA...BUT AS FLOW ALOFT BECOMES SLIGHTLY MORE
CYCLONIC THROUGH THIS EVENING...BELIEVE WE/LL SEE AN INCREASE IN
CONVECTIVE COVERAGE WITH STRONGER CORES PRODUCING LOCALIZED
DAMAGING WINDS AND MARGINALLY SVR HAIL. SFC-6KM SHEAR RANGES FROM
20-25KTS...WHICH SHOULD ALLOW FOR A FEW LONG-LIVED STORMS.

LATE TONIGHT...A COLD FRONT...NOW ACROSS SERN ONTARIO...WILL
TRAVERSE THE FORECAST AREA...ENTERING THE ST. LAWRENCE VALLEY
AROUND MIDNIGHT...AND REACHING VERMONT AROUND DAYBREAK. ALTHOUGH
THE HIGHEST PROBABILITY OF PRECIPITATION IS EXPECTED ALONG AND
JUST AHEAD OF THE FRONT ITSELF...LOSS OF DAYTIME HEATING SHOULD
DECREASE SEVERE THREAT...WITH REMAINING CONVECTIVE STORMS PRODUCING
BRIEFLY HEAVY RAINFALL AND PERHAPS LOCALLY GUSTY WINDS.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH FRIDAY NIGHT/...
NWP GUIDANCE HAS TRENDED SOMEWHAT SLOWER WITH COLD FRONTAL
POSITION...WITH SREF MEAN SUGGESTING THE FRONT WILL EXTEND FROM
NERN VT SWWD INTO CENTRAL VT AT 12Z. HAVE INCREASED POPS FOR THE
MORNING HRS ACROSS SRN HALF OF FORECAST AREA...WITH MENTION OF
ISOLD TSTMS RUTLAND/ORANGE/WINDSOR COUNTIES UNTIL FRONT CLEARS THE
REGION AROUND 16Z. THEREAFTER...MODERATELY STRONG LOW-LEVEL COLD
ADVECTION BEGINS IN EARNEST...ALONG WITH ADVECTION OF MUCH DRIER
AIR INTO THE FORECAST AREA FROM NW-NE. LINGERING CLOUDS IN THE
MTNS THROUGH EVENING ARE EXPECTED...ESPECIALLY WEST FACING SLOPES
WITH A SLIGHT CHANCE OF -SHRA. HELD ONTO CHANCE POPS FOR RAIN
SHOWERS INTO THE AFTERNOON ACROSS FAR S-CENTRAL VT AND WILL LET
FOLLOWING SHIFT MONITOR TRENDS/TIMING FOR ENDING PRECIPITATION.

RIDGE OF SFC HIGH PRESSURE BUILDS EWD FROM THE GREAT LAKES REGION
THURSDAY NIGHT...AND WILL BE THE CONTROLLING WEATHER FEATURE
THROUGH FRIDAY NIGHT. TRENDED CLOSER TO MET GUIDANCE ON
TEMPERATURES THURSDAY NIGHT THROUGH FRIDAY NIGHT...WHICH HAS BEEN
BETTER IN STG CAA SCENARIOS DURING THE PAST 1-2 MONTHS. LOOKING FOR
VLY HIGHS LOW-MID 70S FRIDAY WITH MID-UPR 60S IN THE 1000-2000 FT
RANGE. OVERNIGHT LOWS WILL DIP INTO THE LOW 50S BTV/PBG VCNTY
THU/FRI NIGHT...WITH WIDESPREAD 40S ELSEWHERE. THE 12Z GFS
INDICATES A MID-LEVEL VORT IN NW FLOW APPROACHING LATE FRIDAY INTO
FRIDAY NIGHT. THERE COULD BE LIGHT SHOWER ACTIVITY WITH THIS
FEATURE...BUT HAVE KEPT POPS IN THE SLIGHT CHANCE CATEGORY AT THIS
POINT.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
FOR SATURDAY...MDLS CONTINUE TO BRING SHORTWAVE S ALONG BACKSIDE OF
UPPER LOW SITTING OVER EASTERN CANADA. THIS FEATURE WILL CONTINUE TO
MV ACROSS THE AREA PUSHING THRU BY THE EVENING HRS. WEAK INSTAB
STILL SHOWING FOR SATURDAY...SO WILL CONTINUE MENTION OF RW FOR THE
MORNING HRS...AND TRW FOR THE AFTERNOON/EARLY EVENING. WILL BE CUTTING
BACK ON POPS FOR SUNDAY HOWEVER AS MDLS HINTING AT RIDGE...TO THE
WEST OVER CENTRAL CANADA...BEING A BIT MORE PROGRESSIVE IN MVG INTO
THE AREA...SO WILL CUT BACK TO SL CHANCE FOR RW SUNDAY AS REMNANTS
OF UPPER LOW PUSH AWAY FROM THE CWA. HIGH PRESSURE OVERHD FOR
MON/MON NGT. A COUPLE OF WK LOWS WILL DIVE OUT OF THE GREAT LKS
REGION CUTTING OVER CENTRAL/SOUTHERN NEW ENG IN SUCCESSION EARLY
TUES INTO WEDNESDAY. BASED ON CURRENT MDL TRACK...WILL HIGHLIGHT
BEST CHANCE FOR -RW FOR CENTRAL/SOUTHERN CWA. HAVE GONE AT OR JUST
BLW GUIDANCE MDL TEMPS FOR ENTIRE FORECAST PERIOD...DUE TO EXPECTED
CLD COVER/PRECIP...AND NNW WINDS AS RIDGE SLIDES INTO THE AREA.

&&

.AVIATION /20Z WEDNESDAY THROUGH MONDAY/...
THRU 18Z THURSDAY...SCATTERED SHOWERS AND THUNDERSTORMS THIS
AFTERNOON/EVENING WILL GENERALLY BRING CIGS/VSBY DOWN TO MVFR WITH
BEST CHANCE FOR IFR CONDITIONS AT KMSS AND KSLK THIS AFTERNOON.
WIDESPREAD CONVECTION WILL DISSIPATE AFTER SUNSET WITH LOSS OF
DAYTIME HEATING THOUGH SOME ACTIVITY WILL PERSIST THROUGH JUST
AFTER MIDNIGHT ASSOCIATED WITH COLD FRONTAL PASSAGE. AFTER FRONTAL
PASSAGE AROUND SUNRISE EXPECT SCATTERED VFR CU THRU THURSDAY.

FRI...MAINLY VFR POSSIBLE MVFR WITH SLGT CHC SHRA
SAT...VFR CU POSSIBLY MVFR/IFR WITH SCT TSRA
SUN...SCT VFR CU
MON...SCT-BKN VFR CU

&&

.EQUIPMENT...
THE TEMPERATURE SENSOR AT SPRINGFIELD VERMONT /KVSF/ ASOS FAILED
AROUND 17Z...AND THE EXTREME TEMPERATURES FROM THAT LOCATION
SHOULD BE DISREGARDED FROM EARLIER THIS AFTERNOON. THERE IS A
PART ON ORDER AND EL TECHS WILL BE ON SITE TOMORROW TO INSTALL. IN
THE MEANTIME...THE TEMPERATURE SENSOR HAS BEEN TURNED OFF AT KVSF
ASOS.

&&

.BTV WATCHES/WARNINGS/ADVISORIES...
VT...NONE.
NY...NONE.

&&

SYNOPSIS...BANACOS
NEAR TERM...BANACOS
SHORT TERM...BANACOS
LONG TERM...JN
AVIATION...LAHIFF
EQUIPMENT...BANACOS

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE BURLINGTON VT
251 PM EDT WED JUN 27 2007

NYZ026>031-034-035-087-VTZ001>012-016>019-281200-
NORTHERN ST. LAWRENCE-NORTHERN FRANKLIN-EASTERN CLINTON-
SOUTHEASTERN ST. LAWRENCE-SOUTHERN FRANKLIN-WESTERN CLINTON-
WESTERN ESSEX-EASTERN ESSEX-SOUTHWESTERN ST. LAWRENCE-GRAND ISLE-
WESTERN FRANKLIN-ORLEANS-ESSEX-WESTERN CHITTENDEN-LAMOILLE-CALEDONIA-
WASHINGTON-WESTERN ADDISON-ORANGE-WESTERN RUTLAND-WINDSOR-
EASTERN FRANKLIN-EASTERN CHITTENDEN-EASTERN ADDISON-EASTERN RUTLAND-
251 PM EDT WED JUN 27 2007

...SEVERE THUNDERSTORM WATCH 457 IN EFFECT UNTIL 10 PM EDT THIS
EVENING...

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTHERN NEW YORK...CENTRAL
VERMONT...NORTHEAST VERMONT...NORTHWEST VERMONT AND SOUTHERN
VERMONT.

.DAY ONE...THIS AFTERNOON AND TONIGHT

PLEASE LISTEN TO NOAA WEATHER RADIO OR GO TO WEATHER.GOV ON THE
INTERNET FOR MORE INFORMATION ABOUT THE FOLLOWING HAZARDS.

   SEVERE THUNDERSTORM WATCH.

.DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY

ISOLATED THUNDERSTORMS ARE POSSIBLE ACROSS SOUTH CENTRAL VERMONT
EARLY THURSDAY. THESE STORMS ARE NOT EXPECTED TO BE SEVERE.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED. IF YOU OBSERVE SEVERE WEATHER...
PLEASE CONTACT NWS BURLINGTON WHEN IT IS SAFE TO DO SO.

BANACOS

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BURLINGTON VT
458 PM EDT WED JUN 27 2007

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0400 PM     TSTM WND DMG     CHARLOTTE               44.31N 73.26W
06/27/2007                   CHITTENDEN         VT   LAW ENFORCEMENT

            TREES DOWN ON GREENBUSH RD

0438 PM     TSTM WND DMG     ORWELL                  43.80N 73.30W
06/27/2007                   ADDISON            VT   LAW ENFORCEMENT

            TREES DOWN BLOCKING HWY 22A

&&

GERALDM

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE BURLINGTON VT
504 PM EDT WED JUN 27 2007

VTZ004-006>008-272200-
LAMOILLE-CALEDONIA-WASHINGTON-ESSEX-
INCLUDING...ST. JOHNSBURY
504 PM EDT WED JUN 27 2007

AT 500 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED
SHOWERS AND THUNDERSTORMS OVER ELMORE...MOVING EAST AT 20 MPH.

THE THUNDERSTORM WILL BE NEAR EAST HARDWICK...CABOT BY 520 PM...NEAR
WALDEN...STANNARD BY 530 PM...NEAR WEST DANVILLE BY 540 PM...NEAR
NORTH DANVILLE...DANVILLE BY 550 PM...NEAR ST. JOHNSBURY AND
LYNDONVILLE BY 600 PM.

THIS STORM WILL BE CAPABLE OF PRODUCING WIND GUSTS TO 45 MPH...SMALL
HAIL...AND FREQUENT CLOUD TO GROUND LIGHTNING. IN
ADDITION...RAINFALL AMOUNTS WILL BE AROUND A HALF OF AN INCH.

A SEVERE THUNDERSTORM WATCH IS IN EFFECT UNTIL 10 PM.

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