National Weather Service United States Department of Commerce

Severe Thunderstorms and Excessive Rainfall in the Mid-Atlantic; Heat and Fire Weather Concerns in the West

Scattered strong to severe storms, excessive rainfall, and flooding are expected across parts of the Mid-Atlantic into the Northeast today. Flood Watches are in effect. Heat will continue to impact the West today. Heat advisories are in effect for portions of the Intermountain West; and Extreme Heat Warnings are in effect for portions of Arizona and southeast California. Read More >

 

In this section, the severe weather climatology in the NWS Chicago forecast area is shown by number of days with at least one report. All days with severe weather are weighted equally providing a representative idea of the number of days with severe weather in our area.  In other words, this is the most representative way to look at severe weather climatology in our area since days with a large number of reports (e.g. an outbreak) will not skew the database.


Severe weather can be broken up into three categories, as defined below: 

  Tornado (EF Scale) Damaging Wind Gust (More info) Hail Diameter
All Report Any Rating Any Speed >= 58 mph Any Size >=1"
Significant Report F/EF2, F/EF3, F/EF4, F/EF5 >= 75 mph >= 2"
Non-Significant Report F/EFU, F/EF0, F/EF/1 < 75 mph

< 2"

 

Page last updated: May 2025

Period of record: 1950 - 2024

Find any errors or have questions? Email nws.chicago@noaa.gov

nws logo Media use of NWS Web News Stories is encouraged!
Please acknowledge the NWS as the source of any news information accessed from this site.


Additional recaps can be found on the NWS Chicago Past Events Page
nws logo