from the 7pm NWS Forecast Discussion….
.SHORT TERM /6 AM TUESDAY MORNING THROUGH TUESDAY NIGHT/…
FAIRLY HIGH CONFIDENCE ON A WIDESPREAD SNOWFALL ACROSS THE REGION
ON TUESDAY. LOW PRES MOVES INTO THE MID-ATLANTIC BY DAYBREAK…AND
THEN PASSES SOUTH OF LONG ISLAND THROUGHOUT THE DAY TUESDAY.
To get the timing on the snowfall…. here’s the aviation forecast for the Westchester County Airport, north of White Plains….
Here’s what we learn from the jargon below:
Occasional light snow from 8am to 10am.
Steady snow from 10am, with occasional moderate snow between 11am and 2pm, snow ending about 4pm. For NYC, everything starts about an hour earlier.
KHPN 092340Z 1000/1024 27006KT 1SM BR OVC003
FM100200 27006KT 4SM BR BKN008
FM100400 29006KT P6SM SCT015 SCT200
FM101300 31007KT P6SM SCT015 OVC100
TEMPO 1013/1015 4SM -SN OVC015
FM101500 33007KT 2SM -SN OVC010
TEMPO 1016/1019 1/2SM SN OVC006
FM102100 29009KT P6SM SCT010 BKN080
Times are From date and time in Greenwich Mean Time, five hours ahead of NYC.
For example, FM101500 is from 10th of December at 1500 GMT or 3pm EST.
The NWS has a nice hour-to-hour graph on their weather page – look to the lower right on
your local forecast page…
Here’s a link directly to a sample page (for Ardsley, NY)
And watch out for extreme cold for December, with temperatures not above freezing until Saturday – with the daytime high on Thursday of 25 degrees!