Heavy to excessive rainfall may bring flooding to parts of Arizona, New Mexico, Florida, North Carolina, and Virginia today. Recently burned areas will be particularly vulnerable to flash flooding. Gusty winds and low humidity will bring elevated to critical fire weather conditions to parts of the Northwest U.S. and central Alaska today. 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 |