ZCZC NFDSPENES ALL SPENES MAZ000-NHZ000-RIZ000-CTZ000-NYZ000- . SATELLITE PRECIPITATION ESTIMATES..DATE/TIME 12/29/12 2116Z SATELLITE ANALYSIS BRANCH/NESDIS---NPPU---TEL.301-683-1404 LATEST DATA USED: GOES-13 2045Z HANNA . LOCATION...MASSACHUSETTS...NEW HAMPSHIRE...RHODE ISLAND...CONNECTICUT... LOCATION...NEW YORK... . ATTN WFOS...GYX...BOX...OKX...ALY... ATTN RFCS...NERFC... . EVENT...HEAVY SNOW . SATELLITE ANALYSIS AND TRENDS...LATEST WV IMAGERY SHOWS THAT NEGATIVELY TILTED SHORTWAVE TROF HAS BEEN PUSHING E ACROSS PA THIS AFTERNOON. AHEAD OF THIS FEATURE SURFACE LOW PRESSURE HAS BEEN RAPIDLY DEVELOPING AND WAS MOST RECENTLY ANALYZED NEAR 37N/73W. TO THE NORTH AND WEST OF SURFACE LOW, CLOUD TOPS HAVE BEEN RAPIDLY COOLING WITH BANDED CONVECTIVE TYPE CLOUDS BEGINNING TO MAKE THERE WAY ONSHORE OVER LONG ISLAND. ONE PARTICULARLY SIGNIFICANT BAND WAS LOCATED NEAR 39N/72W WHERE A FEW LIGHTNING STRIKES WERE DETECTED OVER THE LAST 15-30 MINUTES. . LATEST SURFACE ANALYSIS WAS SHOWING BEST PRESSURE FALLS OF 7MB PER THREE HOURS CENTERED NEAR BUOY 44008 AND THIS WOULD SUGGEST SYSTEM SHOULD LIFT NE AND CONTINUE DEEPENING AS IT PASSES VERY NEAR 40N/70W. CURRENT RAIN/SNOW LINE APPEARED TO BE FROM BDR AND THEN EXTENDING OVER LONG ISLAND SOUND TO THE VIC OF BUZZARDS BAY IN SE MA. . SHORT TERM OUTLOOK VALID 2100-0300Z...MEDIUM CONFIDENCE FACTOR IN SHORT TERM OUTLOOK...DEEPENING LOW PRESSURE LIFTING NE SHOULD CONTINUE TO SPREAD HEAVY PRECIPITATION INTO LONG ISLAND AND SE NEW ENGLAND OVER THE NEXT SEVERAL HOURS. THERE MAY BE SOME NW PUSH TO THE RAIN/SNOW LINE OVER PORTIONS OF SE MA OVER THE NEXT SEVERAL HOURS AS STRONG WAA CONTINUES INTO THIS REGION BUT DON'T BELIEVE THAT RAIN/SNOW LINE SHOULD MAKE IT MUCH PAST WHAT APPEARS TO BE MODEST DEVELOPING COASTAL FRONT JUST SE OF AN AXIS FROM PYM TO EWB. WOULD ALSO EXPECT THAT RAIN SHOULD GRADUALLY TRANSITION OVER TO SNOW OVER LONG ISLAND AS SYSTEM CONTINUES TO DEEPEN OFFSHORE. TRAJECTORY OF DRY SLOT ON WV IMAGERY WOULD SUGGEST THAT DEVELOPING DEFORMATION ZONE AND ASSOCIATED LOW LEVEL FRONTOGENESIS SHOULD ENHANCE LARGE SCALE ASCENT FROM LONG ISLAND AND EXTEND ENE TOWARDS CAPE COD AREA AND AS FAR N AS BOS. WOULD EXPECT SNOWFALL RATES TO GRADUALLY INCREASE OVER THE NEXT SEVERAL HOURS WITH LOCALIZED 1.0-2.0"/HR SNOWFALL RATES POSSIBLE IN WSW/ENE ORIENTED BANDS IN DEVELOPING COMMA HEAD. AT THIS POINT WOULD PLACE THINK THE HEAVIEST SNOWFALL SHOULD FALL ROUGHLY ALONG AN AXIS FROM GON TO PVD TO BETWEEN BOS AND PYM WHICH IS IN GOOD AGREEMENT WITH RECENT SWOMCD. . ....NESDIS IS A MEMBER OF 12 PLANET.... . FOR QUESTIONS AND COMMENTS CONCERNING THE SATELLITE PRECIPITATION MESSAGES AND GRAPHICS PLEASE EMAIL SSDPrecip@noaa.gov . FOR PRECIP MESSAGES AND GRAPHICS ON THE WEB: http://www.ssd.noaa.gov/PS/PCPN/ . FOR AUTOMATED SATELLITE PRECIPITATION ESTIMATES ON THE WEB: http://www.star.nesdis.noaa.gov/smcd/emb/ff/CONUS.php . LAT...LON 4286 7105 4285 6846 4235 6813 4127 6975 3953 7259 3996 7374 4160 7310 . NNNN