National Weather Service United States Department of Commerce

Subtropical Storm Josephine Impacts the Eastern Seaboard; Pacific Storm Impacting the Southwest U.S.

Subtropical Storm Josephine will continue to bring significant coastal flooding impacts, dangerous marine conditions, and beach erosion along portions of the Eastern Seaboard. A Pacific storm will interact with tropical moisture and bring excessive rainfall, severe thunderstorms, and high elevation snow to California, the Southwest, and Four Corners region. Read More >

 

Summer Briefing

 

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Click here for a static hazards map.

 

Local Storm Reports

Severe Weather Outlooks

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Day 3

 

Information on SPC's Severe Thunderstorm Risk Categories

River Flooding

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Precipitation Forecast

1-Day Rainfall

2-Day Rainfall

3-Day Rainfall

 

Forecast Timelines

Single Site Timelines

Detailed Point Forecast

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Climate Outlooks

8-14 Day Temp Outlook

8-14 Day Precip Outlook

 

Drought Monitor

 

Summer Weather Definitions

Tornado or Severe Thunderstorm WATCH:

Conditions are favorable for the development of tornadoes, large hail, and/or damaging winds.

 
Tornado WARNING:

A tornado has been detected on radar or sighted by trained spotters.

 
Severe Thunderstorm WARNING:

A severe thunderstorm has been detected on radar or reported by trained spotters. A severe thunderstorm is a storm that produces hail 1 inch or larger and/or winds 58 mph or greater

 
Severe Thunderstorm Outlook Terms:
  • Marginal Risk:

    Isolated severe thunderstorms are possible.

  • Slight Risk:

    Scattered or short-lived severe thunderstorms are possible.

  • Enhanced Risk:

    Numerous or persistent severe thunderstorms are possible.

  • Moderate Risk:

    Widespread, long-lived, and intense severe thunderstorms are likely.

  • High Risk:

    Widespread, long-lived, and particularly intense severe thunderstorms are expected.

Flood WATCH:

Conditions are favorable for flooding.

 
Flash Flood WARNING:

Life-threatening flooding is detected on radar, indicated by stream gauges, or reported by storm spotters. A flash flood is a flood that occurs very quickly; it is caused by heavy rainfall over a short period of time or from a dam break.

 
Flood WARNING:

Rivers overflowing their banks or water covering a normally dry area. Floods are usually caused by heavy rain over a long period of time, rapidly melting snow, or ice jams.

 
Extreme Heat WARNING:

Heat index 105 degrees or higher, with a minimum heat index of 75 degrees for 48 hours or longer; or heat index of 100 degrees or higher for four consecutive days.

 
Heat ADVISORY:

Heat index 100 degrees or higher; or heat index between 95 and 100 degrees for four consecutive days.