Tropical Depression Nine has formed and will continue to slowly move to the north-northwest in the coming days. As the storm passes close to the east coast of Florida, tropical storm conditions are possible Sunday through Monday. Tropical Storm Watches have been issued. Significant uncertainty remains in the track and intensity, but chances for impacts to the Southeast are increasing. 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 |