National Weather Service United States Department of Commerce

Summer Heat and Flooding Likely Today

Dangerous and intense summer heat is likely in several locations today, from the central Plains to the Great Lakes and Northeast and in the Pacific Northwest. Meanwhile, heavy to excessive rainfall from organized areas of rain and thunderstorms are likely going to produce flood issues in the Upper Mississippi Valley. Also, monsoonal showers and storms may result in flooding in the Four Corners. Read More >


Summer Briefing

Current Hazards


Rapid City Radar

Regional Radar

Bowman Radar

Local Storm Reports

Severe Weather Outlooks

Day 1

Day 2

Day 3

Information on SPC's Severe Thunderstorm Risk Categories

River Flooding

Precipitation Forecast

1-Day Rainfall

2-Day Rainfall

3-Day Rainfall

Probability of 1 Inch of Rainfall

Day 1

Day 2

Day 3

Forecast Timelines

Single Site Timelines

Detailed Point Forecast

(click map to change the location of the forecast listed below the map)

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.


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.

Urban or Small Stream Flood ADVISORY:

Flooding of small streams, streets, and low-lying areas such as underpasses and storm drains.

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