National Weather Service United States Department of Commerce

Heavy Rain From the Central Plains to the Mid-Atlantic; Heat Wave Begins This Weekend

Strong to severe thunderstorms and heavy rain will impact portions of the central Plains into the Upper Midwest and the Mid-Atlantic through the weekend. A stretch of unusually hot and humid weather is expected across portions of the central U.S. and the Southeast beginning this weekend and continuing through next week. The heat may reach dangerous levels, particularly mid to late next week. Read More >

 

Summer Briefing


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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.