National Weather Service United States Department of Commerce

Tracking Atmospheric River in the Northwest U.S. and Clipper with Winter Weather in the Northeast U.S.

A prolonged atmospheric river will continue to bring gusty winds, heavy rainfall which may lead to urban and river flooding with possible landslides, and heavy inter-mountain snow over the Pacific Northwest into the northern Rockies through Thursday. A clipper will cross the Great Lakes and Northeast U.S. into Thursday with areas of moderate to heavy snow and mixed wintry precipitation. Read More >

WFO PHI Weather Product Criteria

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-- Convective:
  Tornado Warning
  Severe Thunderstorm Warning
  Special Weather Statement

-- Flooding:
  Flash Flood Warning
  Flood Warning
  Flood Advisory
  Flood Watch

-- Heat:
  Extreme Heat Watch or Warning
  Heat Advisory

-- Wind:
  High Wind Watch or Warning
  Wind Advisory

-- Fog:
  Dense Fog Advisory
  Freezing Fog Advisory

-- Frost/Freeze:
  Freeze Season Begins
  Freeze Season Ends

-- Fire Weather:
  Fire Weather Watch or
Red Flag Warning
NWS Philadelphia/Mount Holly

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