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Johnson County weather alerts

1 active alert for Johnson County, Missouri right now: a Special Weather Statement.

21 in the last 30 days 21 in 12 months (since Aug 30) most common: Extreme Heat Warning Get alerts on your phone →

Active alerts for Johnson County

Refreshed every few minutes; times in CDT.

Moderate Expected

Special Weather Statement

Issued Sun, Sep 6, 10:10 PM CDT by NWS Kansas City/Pleasant Hill MO Until Sun, Sep 6, 10:45 PM CDT (in 15 min)

Area: Cass; Johnson

At 1010 PM CDT, Doppler radar was tracking strong thunderstorms along a line extending from near East Lynne to near Holden. Movement was north at 10 mph. HAZARD...Wind gusts up to 50 mph and pea size hail. SOURCE...Radar indicated. IMPACT...Gusty winds could knock down tree limbs and blow around unsecured objects. Minor hail damage to vegetation is possib...

What it means: A heads-up about conditions that do not meet warning or advisory criteria but still deserve attention, such as a strong storm, patchy fog or a brief burst of snow.

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Where

Johnson County on the map

Alert polygons are NWS's own. Forecast Bar's radar shows the same warnings over live precipitation, with future radar and lightning. See the radar.

Last 30 days

Recent alerts for Johnson County

Alert	Issued	Ended	Issued by
Extreme Heat Warning	7:55 PM	8:00 PM	Kansas City/Pleasant Hill MO
Severe Thunderstorm Watch	4:44 PM	10:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	1:41 PM	8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	3:39 AM	8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 5, 7:54 PM	8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 5, 1:03 PM	Cancelled Sep 5, 7:55 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 5, 4:15 AM	Sep 8, 8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 4, 6:02 PM	Sep 8, 8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 4, 12:11 PM	Sep 8, 8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 4, 4:18 AM	Sep 8, 8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 3, 7:36 PM	Sep 8, 8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 3, 11:37 AM	Sep 8, 8:00 PM	Kansas City/Pleasant Hill MO
Extreme Heat Warning	Sep 3, 11:30 AM	Sep 5, 8:00 PM	Kansas City/Pleasant Hill MO
Heat Advisory	Sep 3, 5:32 AM	Cancelled Sep 3, 11:31 AM	Kansas City/Pleasant Hill MO
Heat Advisory	Sep 2, 1:18 PM	Cancelled Sep 3, 5:33 AM	Kansas City/Pleasant Hill MO
Heat Advisory	Sep 2, 6:44 AM	Sep 4, 8:00 PM	Kansas City/Pleasant Hill MO
Heat Advisory	Sep 1, 11:06 AM	Sep 4, 8:00 PM	Kansas City/Pleasant Hill MO
Heat Advisory	Sep 1, 4:03 AM	Sep 4, 8:00 PM	Kansas City/Pleasant Hill MO
Heat Advisory	Aug 31, 9:25 PM	Sep 4, 8:00 PM	Kansas City/Pleasant Hill MO
Heat Advisory	Aug 31, 1:37 PM	Sep 4, 8:00 PM	Kansas City/Pleasant Hill MO

Pattern

What Johnson County gets alerted for

Every alert that named Johnson County in the last 12 months, by type. Records begin August 30, 2026, so this fills in over the year.

Extreme Heat Warning

Heat Advisory

Severe Thunderstorm Watch

Special Weather Statement

Plain English

What these alerts mean

A warning means the hazard is happening or about to; a watch means conditions favour it; an advisory is a lesser hazard still worth planning around.

Special Weather Statement

A heads-up about conditions that do not meet warning or advisory criteria but still deserve attention, such as a strong storm, patchy fog or a brief burst of snow.

Extreme Heat Warning

Extremely dangerous heat. Avoid strenuous activity, stay in cool spaces and never leave people or pets in a vehicle.

Severe Thunderstorm Watch

Conditions are favourable for severe thunderstorms with large hail or damaging wind. Keep an eye on the sky and on warnings.

Heat Advisory

Heat index values high enough to cause heat illness with prolonged exposure. Drink water, stay in air conditioning and check on neighbours.

Nearby

Alerts near Johnson County

Neighbouring counties in Missouri

Lafayette County Henry County Pettis County Cass County3 Jackson County1 Saline County All of Missouri →

Questions

About Johnson County alerts

How do I get Johnson County weather alerts on my iPhone?

Install Forecast Bar, add Johnson County as a location, and turn on severe weather alerts. Every NWS warning, watch and advisory for Johnson County then arrives as a push notification at the moment of issue, with Critical Alerts available for the most dangerous warnings. Forecast Bar also runs on iPad, Apple Watch, Mac and Apple TV.

Where do these alerts come from?

From the National Weather Service alert feed (api.weather.gov). NWS issues alerts by county and by forecast zone; this page lists every product that names Johnson County. Forecast Bar checks the feed continuously and this page refreshes within a few minutes of a change.

What is the difference between a watch, a warning and an advisory?

A warning means the hazard is occurring, imminent or very likely: act now. A watch means conditions are favourable for it to develop: prepare and stay informed. An advisory covers a hazard that is less serious than a warning but can still cause real inconvenience or danger if you are not ready for it.

Can I get this data as JSON?

Yes. /weather-alerts/mo/johnson-county.json returns the active alerts, the last 30 days and the 12-month counts for Johnson County, refreshed every minute. Please cache responses and credit National Weather Service as the source.

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