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Obs and nowcast Sunday 12/20/20 daylight snowfall


wdrag
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Periods of light snow or flurries today in the I84 corridor will possibly maximize their accumulations near Interstate 95 between 10AM and 3PM with a narrow stripe of 1," possibly just sw through north of NYC and a chance of measurable in the city. Not all models agree but the NAM, RGEM, HRRR from 06z/20 are on board.  Doubt if it will much impact on well traveled pavements, especially treated, but side streets etc may become slush covered with this pleasant refreshing of the snowpack, wherever more than 1/4" occurs.  Central and eastern LI may not see snow or if any, it would be too warm for accumulation. Checking the 3K NAM profile,  there is a small chance visibility will lower to 3/4 mi in S- for an hour or so during midday.  

For the I84 corridor, maximum snowfall appears destined for CT and occurring there mostly this afternoon. One experimental snow accumulation graphic is added from 06z/20 (HRRRX)

 

Not for this thread, but a heads that increasingly unstable moist lapse rates may bring a surprise 1" to parts of our NYC suborum between 10PM Monday and 10 AM Tuesday with the passage of a fairly strong cold trough aloft. A separate thread will be started for that on Monday, if that speculation still looks reliable. 536A/20

 

Edited 105PM:  Looks like nw 1/4 NJ and a part of interior se NYS, and most of ne PA will have missed this minor short duration negligible impact event except to brighten the spirits of the snow enjoying families/shoppers.  I thought we'd at least get flurries up here but NOT so far. Not complaining. Just an observation.  Nice day up here, despite no snow.   No change on thinking for early Tue. 103PM. 

Screen Shot 2020-12-20 at 5.14.34 AM.png

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There is quite a bit of Precip on radar to the south and west of NYC BUT how much is actually reaching the ground ?

RWR from KPHI (cod.edu)

  
  
POMONA         MOCLDY    31  26  82 CALM      30.23F                    
WILDWOOD*      MOCLDY    33  31  92 CALM      30.23F                    
MILLVILLE      CLOUDY    32  29  88 SE3       30.21F                    
WRIGHTSTOWN    MOCLDY    29  24  82 CALM      30.22S                    
MOUNT HOLLY    CLOUDY    30  25  81 CALM      30.22F                    
TRENTON        CLOUDY    27  20  75 E3        30.21S                    
  

 
NJZ001>014-201400-  
NORTHERN NEW JERSEY  

 
CITY SKY/WX TMP DP RH WIND PRES REMARKS
 
SUSSEX CLOUDY 23 18 81 SW3 30.19R  
ANDOVER* N/A 25 19 78 CALM 30.19R  
MORRISTOWN MOCLDY 28 23 80 CALM 30.24R  
NEWARK CLOUDY 30 20 66 S5 30.25R WCI 25  
TETERBORO MOCLDY 30 21 69 CALM 30.23S  
CALDWELL MOCLDY 29 18 63 CALM 30.24R  
SOMERVILLE MOCLDY 26 20 77 CALM 30.22R  
ALLAIRE* CLOUDY 30 21 69 CALM 30.24R  
TOMS RIVER* CLOUDY 29 23 78 CALM 30.25S  
 


 
PAZ043-044-047-054-055-060>062-066>071-201400-  
EASTERN PENNSYLVANIA  

 
CITY SKY/WX TMP DP RH WIND PRES REMARKS
 
PHILADELPHIA CLOUDY 32 25 75 E5 30.21F WCI 27  
NORTH PHILA CLOUDY 31 24 75 E5 30.22F WCI 26  
BLUE BELL* CLOUDY 28 24 85 NE3 30.20F  
DOYLESTOWN CLOUDY 29 19 66 CALM 30.20S  
QUAKERTOWN* CLOUDY 27 21 80 CALM 30.19F  
PERKASIE* CLOUDY 27 23 86 CALM 30.19F  
POTTSTOWN CLOUDY 25 20 81 NE5 30.21F WCI 19  
LANCASTER CLOUDY 29 22 75 E7 30.15F WCI 22  
COATESVILLE MOCLDY 28 25 86 CALM 30.18S  
WEST CHESTER FAIR 30 27 86 CALM 30.19S  
READING MOCLDY 26 20 77 CALM 30.16F  
ALLENTOWN CLOUDY 25 18 74 NE5 30.20R WCI 19  
QN CITY/ALNTWN CLOUDY 28 21 74 CALM 30.21F  
MOUNT POCONO CLOUDY 25 23 92 S7 30.08F WCI 17  
HAZLETON CLOUDY 28 23 80 SE5 30.12S WCI 23  
LEHIGHTON CLOUDY 25 21 86 CALM 30.20S  
WILKES BARRE MOCLDY 26 20 77 CALM 30.12S  
 


 
DEZALL-MDZ008-012-015-019-020-201400-  
DELAWARE AND EASTERN MARYLAND  
 
CITY SKY/WX TMP DP RH WIND PRES REMARKS
 
WILMINGTON CLOUDY 33 27 78 SE7 30.21F WCI 27  
DOVER LGT RAIN 35 29 80 S6 30.21S WCI 30  
CHESWOLD CLOUDY 36 30 80 S3 30.21S  
GEORGETOWN MOCLDY 34 30 85 CALM 30.22S  
EASTON LGT RAIN 36 34 93 E5 30.22F WCI 32  
STEVENSVILLE LGT RAIN 37 37 100 MISG 30.19F  
ABERDEEN MOCLDY 33 29 86 CALM 30.19F  
PATUXENT CLOUDY 41 33 73 S5 30.20R  
OCEAN CITY MOCLDY 34 32 92 CALM 30.22S  
WALLOPS ISLAND MOCLDY 35 34 96 NW6 30.23R WCI 30  
CAMBRIDGE MOCLDY 37 34 87 S5 30.22R WCI 34  
SALISBURY MOCLDY 33 30 88 S3 30.22R  
 


 
PAZ001-021-NYZ056-072-MDZ011-DCZ001-201400-  
OTHER NEARBY LOCATIONS  

 
CITY SKY/WX TMP DP RH WIND PRES REMARKS
 
HARRISBURG CLOUDY 28 22 78 CALM 30.15F  
STATE COLLEGE LGT SNOW 23 21 93 CALM 30.05F  
WILLIAMSPORT CLOUDY 24 19 81 E6 30.09F HAZE WCI 17  
BINGHAMTON CLOUDY 23 19 85 SE7 30.02F WCI 15  
NEW YORK CITY MOCLDY 33 19 56 CALM 30.24S  
BALTIMORE CLOUDY 36 30 79 VRB3 30.16F  
WASHINGTON DC CLOUDY 38 32 79 S5 30.18F WCI 34  
 


 
 

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