Severe Thunderstorm Watch — Lyon County, Iowa
Conditions favor the development of severe thunderstorms in and near the watch area.
Current Status
⛈️ Active: Severe Thunderstorm Watch
Severe Thunderstorm Watch issued September 1 at 9:51PM CDT until September 2 at 5:00AM CDT by NWS Sioux Falls SD
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH 640 UNTIL 5 AM CDT WEDNESDAY WHICH REPLACES A PORTION OF SEVERE THUNDERSTORM WATCH 639. THE NEW WATCH IS VALID FOR THE FOLLOWING AREAS IN IOWA THE NEW WATCH INCLUDES 6 COUNTIES IN NORTHWEST IOWA CHEROKEE LYON PLYMOUTH SIOUX IN WEST CENTRAL IOWA IDA WOODBURY IN NEBRASKA THE NEW WATCH INCLUDES 2 COUNTIES IN NORTHEAST NEBRASKA DAKOTA DIXON IN SOUTH DAKOTA THE NEW WATCH INCLUDES 1 COUNTY IN SOUTHEAST SOUTH DAKOTA UNION THIS INCLUDES THE CITIES OF ALCESTER, ALLEN, BATTLE CREEK, BERESFORD, CHEROKEE, ELK POINT, GEORGE, HAWARDEN, HOLSTEIN, HULL, IDA GROVE, INWOOD, JEFFERSON, LARCHWOOD, LE MARS, NORTH SIOUX CITY, ORANGE CITY, PONCA, ROCK RAPIDS, ROCK VALLEY, SIOUX CENTER, SIOUX CITY, SOUTH SIOUX CITY, AND WAKEFIELD.
Effective September 1, 2026 at 10:51 PM ET · Expires September 2, 2026 at 6:00 AM ET
Event Details
Event Type
Severe Thunderstorm Watch
Severity
severe
Issued By
NWS Sioux Falls SD
Expires
September 2, 2026 at 6:00 AM ET
Last Checked
1 minute ago
Also In Effect For
This same Severe Thunderstorm Watch also covers:
Other Active Alerts in Iowa
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Severe Thunderstorm Watch
Get Severe Thunderstorm Watch Alerts for Lyon County
StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
Frequently Asked Questions
What does a Severe Thunderstorm Watch mean for Lyon County, Iowa?
Conditions favor the development of severe thunderstorms in and near the watch area.
Is this Severe Thunderstorm Watch currently active?
Yes — this alert is active as of our last check (1 minute ago). It's set to expire September 2, 2026 at 6:00 AM ET.
How do I get notified about Severe Thunderstorm Watch alerts for Lyon County?
Download StormCast free on Google Play and set Lyon County, Iowa as one of your monitored locations. StormCast checks the NWS feed continuously and pushes alerts like this directly to your phone — even with the screen off.
What other areas does this alert cover?
This same Severe Thunderstorm Watch is also in effect for Union County, Dakota County, Dixon County, Cherokee County, Ida County, Plymouth County, Sioux County, Woodbury County.