Active weather for the center of the nation today. Severe thunderstorms and flash flooding concerns over portions of the Central and Southern Plains into the Mississippi Valley today into tonight. Meanwhile, cool and snowy in parts of the Northwest and Great Basin with above average and potentially record breaking temperatures for the Ohio Valley and Mid-Atlantic. Read More >
Local Products
Winter Products from National Centers
Watch/Warning/Advisory Terminology & Criteria
Criteria Maps of Winter Storm Watches, Warnings & Advisories for New Jersey, eastern Pennsylvania, Delaware, eastern Maryland | |
12-Hour Advisory Snowfall | |
12-Hour Warning Snowfall | |
24-Hour Warning Snowfall | |
Freezing Rain Advisory | |
Ice Storm Warning | |
Wind Chill Advisory | |
Wind Chill Warning |
Gradient high wind outlooks, watches, warnings, and wind advisories shall be issued using the following wind speed values | ||
Product Type | Sustained Wind ( 1 Hr) | Any duration gust |
High Wind Outlook | >= 40 MPH (35 KTS) | >= 58 MPH (50 KTS) |
High Wind Watch | >= 40 MPH (35 KTS) | >= 58 MPH (50 KTS) |
High Wind Warning | >= 40 MPH (35 KTS) | >= 58 MPH (50 KTS) |
Wind Advisory (land) | 31-39 MPH (27-34 KTS) | 46-57 MPH (40-49 KTS) |
Wind Advisory for area lakes | 25-30 MPH (22-26 KTS) | 40-45 MPH (35-39 KTS) |
Seasonal Snowfall Totals from 1979-Present (updated May 2017):
Preliminary Top Ten Philadelphia Snow Storms (updated May 2017):
Ranking |
Value |
|
Duration |
|
|
1 |
30.7 |
|
|
||
2 |
28.5 |
|
|
||
3 |
23.2 |
|
|||
4 |
22.4 |
|
|
||
5 |
21.3 |
|
February 11-12 1983 |
|
|
6 |
21 |
|
December 25-26 1909 |
||
7 |
19.4 |
|
April 3-4 1915 |
|
|
8 |
18.9 |
|
February 12-14 1899 |
|
|
9 |
18.7 |
|
|
||
10 |
16.7 |
|
January 22-24 1935 |