MD 0111 CONCERNING HEAVY SNOW FOR NEW JERSEY…SOUTHEAST PENNSYLVANIA…SOUTHEAST NEW YORK…SOUTHERN NEW ENGLAND
Mesoscale Discussion 0111 NWS Storm Prediction Center Norman OK 1225 PM CST Wed Mar 07 2018 Areas affected...New Jersey...Southeast Pennsylvania...Southeast New York...Southern New England Concerning...Heavy snow Valid 071825Z - 080030Z SUMMARY...Moderate to heavy snowfall is expected to continue across parts of southeast Pennsylvania, New Jersey and New York City this afternoon gradually spreading northeastward into southern New England. DISCUSSION...The latest surface analysis shows a 995 mb low about 110 statute miles east of the southern Delaware coast. A pronounced dry slot evident on water vapor imagery is located just off the New Jersey coast. Water vapor imagery shows rapidly cooling cloud tops over the last couple of hours in the southern part of the MCD area and lightning strikes are also noted. This is due to the approach of a band of large-scale ascent associated with a negatively-tilted upper-level trough moving through the Mid-Atlantic. This combined with strong isentropic ascent oriented parallel to the coast and just inland is maintaining a band of moderate to heavy precipitation. Although surface temperatures from New Jersey north-northeastward into southern New England are generally just above freezing, temperatures have cooled a couple degrees over the last hour. This dynamic cooling has resulted in a change-over from rain to snow in the New York City vicinity over the last hour. The heaviest snowfall is occurring within a band oriented from south-southwest to north-northeast across New Jersey and southeastern New York. This band will continue to spread north-northeastward into southern New England this afternoon. Snowfall rates of 1 to 2 inches per hour will be common. A few spots could receive snowfall rates of more than 2 inches per hour especially related to convection. Locations in far southeastern Massachusetts near Cape Cod will likely remain rain through early evening. ..Broyles/Hart.. 03/07/2018 ...Please see www.spc.noaa.gov for graphic product... ATTN...WFO...BOX...OKX...ALY...PHI... LAT...LON 40507320 39827419 39497519 39877578 40547564 42067372 42587157 42557086 42237057 41807059 41337106 41007213 40507320
from SPC Mesoscale Discussions http://bit.ly/1nIej5e
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