Skip Navigation Links 
NOAA logo-Select to go to the NOAA homepage NOAA's National Weather Service   Select to go to the NWS homepage
Storm Prediction Center
navigation bar left  
  navigation bar end cap is the U.S. Government's official Web portal to all Federal, state and local government Web resources and services.

Mesoscale Discussion 27
< Previous MD         Next MD >
MD 27 graphic

   Mesoscale Discussion 0027
   NWS Storm Prediction Center Norman OK
   0247 AM CST Sat Jan 13 2018

   Areas affected...Northern...central...and western NY into part of
   north-central PA

   Concerning...Heavy snow 

   Valid 130847Z - 131445Z

   SUMMARY...Snowfall rates (at least 1 inch/hour) are expected to
   expand in coverage from west to east across western into northern NY
   and north-central PA during the remainder of the overnight into this
   morning (until 7-10 AM EST).

   DISCUSSION...The track of a progressive, negatively tilted shortwave
   trough through PA/NY during the remainder of the overnight, and then
   into northern New England after 12Z will maintain a favorable
   deformation zone aloft from western into northern NY, and adjacent
   northwest/north-central PA.  Surface observations have indicated a
   few locations already having heavy snowfall rates from near the
   northwest PA/OH border at KYNG into western NY.  Meanwhile, forecast
   soundings suggest increases in upward vertical motion within the
   dendritic growth zone through this morning, given the presence of
   strengthening midlevel frontogenetic forcing around 700 mb.  Models
   suggest a colder environment will spread east, supporting a greater
   area that will become favorable for periodic increases in snowfall
   rates trough 12Z across north-central PA, part of the Southern Tier
   counties and central NY, and through 15Z across northern NY.

   ..Peters.. 01/13/2018

   ...Please see for graphic product...


   LAT...LON   44997333 44577344 43077506 41997650 41667712 41467808
               41737862 41997901 42417893 42927846 43377780 44177674
               44617593 44997503 44997333 

Top/All Mesoscale Discussions/Forecast Products/Home
Weather Topics:
Watches, Mesoscale Discussions, Outlooks, Fire Weather, All Products, Contact Us

NOAA / National Weather Service
National Centers for Environmental Prediction
Storm Prediction Center
120 David L. Boren Blvd.
Norman, OK 73072 U.S.A.
Page last modified: January 13, 2018
Information Quality
Privacy Policy
Freedom of Information Act (FOIA)
About Us
Career Opportunities