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Midweek Storm DISCO


DomNH

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This is kind of funny.

* LOCATIONS...SOUTHERN NEW HAMPSHIRE AS WELL AS NORTHWEST AND

NORTH CENTRAL MASSACHUSETTS.

* HAZARD TYPES...SNOW AND ICE.

* ACCUMULATIONS...5 TO 10 INCHES OF SNOW WITH THE HIGHER AMOUNTS

MOST LIKELY IN NORTHERN CHESHIRE AND NORTHERN HILLSBOROUGH

COUNTIES. IN ADDITION...ICE ACCRETION OF ONE TENTH TO ONE

QUARTER OF AN INCH ARE POSSIBLE AFTER THE CHANGE TO FREEZING

RAIN TUESDAY EVENING.

* TIMING...SNOW BEGINS BETWEEN 6 AND 10 AM TUESDAY. THE SNOW WILL

FALL HEAVY AT TIMES THROUGH THE AFTERNOON. THE SNOW WILL LIKELY

CHANGE TO A PERIOD OF SLEET AND FREEZING RAIN TUESDAY EVENING.

* IMPACTS...UNTREATED ROADS WILL BECOME SNOW COVERED AND SLIPPERY.

FREEZING RAIN AND SLEET MAY FALL ON TOP OF THE SNOW TUESDAY

EVENING...ADDING TO THE HAZARDOUS TRAVEL.

* WINDS...NORTH 5 TO 10 MPH.

* TEMPERATURES...5 TO 32 ABOVE.

* VISIBILITIES...MAY BE REDUCED TO UNDER ONE HALF MILE AT TIMES.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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box AFD doesn't really mention dynamic cooling at all

does mention GL weakening low will drag mid level warmth into region. IMO this could cut down totals in GC/ S.VT

i would like to compare 8h-9h soundings for KPIT ...KORH KBOS for 21 and 0z . .....respectively.

i would assume mid levels would warm a tad more out west closer to the source (GL Low)

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also the 12z gfs on twister osu shows MSLP -500 column max temp

this may show why box tempered GC accums

the 1000-500 mb max temps map shows 0c + cutting just west of ORH into GC at 21z ....with a nice sub 0c layer .....thru C. CT nw Ri and the 128 belt past 495.......then at 0z

http://www.twisterdata.com/index.php?prog=forecast&model=GFS&grid=3&model_yyyy=2011&model

_mm=01&model_dd=17&model_init_hh=12&fhour=33&parameter=TVMXC&level=SFC_500&unit=MB&ma

ximize=n&mode=singlemap&sounding=n&output=image&view=large&archive=false

looks like sub 0c 850's hang on for NE mass thru 0z but BL temps warm a touch too much. 8H could be marginal as well...guess that is the beauty of looking at plymouth state soundings ...eliminates the mystery.

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BOX p+c gives me 4-8, map gives me 5, warning says 2-6 and .25-.5 ice, with higher snows north of ma pike. It seems like a very tough forecast here. Depending on how things play out it may be 3" then quick change, or we could end up with an 8-12" snow bomb before the changeover if the 18z nam is right. Split the difference. 3-6" 1st call, 4-7" final call.

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