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Mesoscale Discussion 1967
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   MESOSCALE DISCUSSION 1967
   NWS STORM PREDICTION CENTER NORMAN OK
   0112 AM CST SAT DEC 06 2014

   AREAS AFFECTED...PARTS OF SERN NH AND SRN ME

   CONCERNING...FREEZING RAIN 

   VALID 060712Z - 061045Z

   SUMMARY...A NARROW CORRIDOR OF FREEZING RAIN SHOULD DEVELOP NE FROM
   SERN NH ACROSS PARTS OF SRN ME. ICE ACCRETION RATES OF 0.03-0.09
   IN/HR SHOULD BE COMMON...BUT WILL LIKELY ONLY LAST 2-3 HOURS IN ANY
   ONE LOCATION.

   DISCUSSION...A BAND OF FREEZING RAIN HAS STEADILY PROGRESSED NE WITH
   ROBUST LOW-LEVEL WAA/ISENTROPIC ASCENT AS INFERRED BY LARGE CYCLONIC
   HODOGRAPHS IN AREA VWP DATA. DUAL-POL DATA FROM KGYX IN CONJUNCTION
   WITH KCON ASOS CONFIRM THE TRANSITION FROM SNOW TO FREEZING RAIN
   OCCURRING OVER BELKNAP COUNTY NH AND YORK COUNTY ME AS OF 07Z. ICE
   ACCRETION ESTIMATES OF 0.09 INCHES OCCURRED IN THE PAST HOUR AT
   KMHT...WITHIN THE BELT OF 30-35 DBZ REFLECTIVITIES OVER SERN NH.
   MOST GUIDANCE APPEARS TO STRUGGLE WITH THE THIN ABOVE-FREEZING LAYER
   SAMPLED IN 04-06Z AMDAR DATA INVOF KALB/KBDL/KBOS. BUT A COMBINATION
   OF RAP FORECAST SOUNDINGS IN CONJUNCTION WITH 00Z WRF-NSSL
   REFLECTIVITY PTYPE GUIDANCE SUPPORT A NARROW CORRIDOR OF FREEZING
   RAIN DEVELOPING ACROSS PARTS OF SRN ME THIS MORNING...ALONG/N OF
   I-95.

   ..GRAMS.. 12/06/2014


   ATTN...WFO...CAR...GYX...BOX...

   LAT...LON   43567118 44047065 44596987 44906942 45096911 45206873
               45096844 44886846 44656887 44286949 43747035 43187101
               42947135 42947157 43187159 43567118 

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Page last modified: December 06, 2014
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