Johnston, IA Alerts
Severe Thunderstorm Watch issued June 11 at 2:15AM CDT until June 11 at 10:00AM CDT by NWS Des Moines IA
Headline
Severe Thunderstorm Watch issued June 11 at 2:15AM CDT until June 11 at 10:00AM CDT by NWS Des Moines IA
Description
THE NATIONAL WEATHER SERVICE HAS ISSUED SEVERE THUNDERSTORM WATCH
310 IN EFFECT UNTIL 10 AM CDT THIS MORNING FOR THE FOLLOWING
AREAS
IN IOWA THIS WATCH INCLUDES 38 COUNTIES
IN CENTRAL IOWA
BOONE DALLAS GRUNDY
HAMILTON HARDIN JASPER
MARSHALL POLK POWESHIEK
STORY TAMA WEBSTER
IN NORTHEAST IOWA
BLACK HAWK
IN SOUTH CENTRAL IOWA
APPANOOSE CLARKE DECATUR
LUCAS MADISON MAHASKA
MARION MONROE RINGGOLD
UNION WARREN WAYNE
IN SOUTHEAST IOWA
DAVIS WAPELLO
IN SOUTHWEST IOWA
ADAIR ADAMS CASS
TAYLOR
IN WEST CENTRAL IOWA
AUDUBON CALHOUN CARROLL
CRAWFORD GREENE GUTHRIE
SAC
THIS INCLUDES THE CITIES OF ACKLEY, ADAIR, ADEL, ALBIA, ALLERTON,
AMES, ATLANTIC, AUDUBON, BAYARD, BEDFORD, BLOOMFIELD, BOONE,
CARLISLE, CARROLL, CASEY, CEDAR FALLS, CENTERVILLE, CHARITON,
CONRAD, CORNING, CORYDON, CRESTON, DENISON, DES MOINES, DIKE,
DYSART, EARLHAM, EARLY, ELDORA, EXIRA, FONTANELLE, FORT DODGE,
GLADBROOK, GREENFIELD, GRINNELL, GRUNDY CENTER, GUTHRIE CENTER,
HUMESTON, INDIANOLA, IOWA FALLS, JEFFERSON, KNOXVILLE, LAKE CITY,
LAKE VIEW, LAMONI, LENOX, LEON, MANSON, MARSHALLTOWN, MOUNT AYR,
NEW MARKET, NEWTON, NORWALK, ODEBOLT, OSCEOLA, OSKALOOSA,
OTTUMWA, PANORA, PELLA, PERRY, POMEROY, REINBECK, ROCKWELL CITY,
SAC CITY, SCHALLER, SEYMOUR, STUART, TAMA, TOLEDO, TRAER,
WALL LAKE, WATERLOO, WAUKEE, WEBSTER CITY, WELLSBURG,
AND WINTERSET.
* PRIMARY THREATS INCLUDE...
SCATTERED LARGE HAIL LIKELY WITH ISOLATED VERY LARGE HAIL EVENTS
TO 3 INCHES IN DIAMETER POSSIBLE.
ISOLATED DAMAGING WIND GUSTS TO 70 MPH POSSIBLE.
A TORNADO OR TWO POSSIBLE.
PROBABILITY TABLE:
PROB OF 2 OR MORE TORNADOES : 20%
PROB OF 1 OR MORE STRONG /EF2-EF5/ TORNADOES : 10%
PROB OF 10 OR MORE SEVERE WIND EVENTS : 30%
PROB OF 1 OR MORE WIND EVENTS >= 75 MPH : 10%
PROB OF 10 OR MORE SEVERE HAIL EVENTS : 70%
PROB OF 1 OR MORE HAIL EVENTS >= 2 INCHES : 50%
PROB OF 6 OR MORE COMBINED SEVERE HAIL/WIND EVENTS : 90%
MEAN STORM MOTION /MPH/ : E 30
Instructions
Additional Details
| Type | Alert |
| Phenomena | Severe Thunderstorm |
| Severity | Watch |
| Event Code | SVA |
| Area | Adair, IA; Adams, IA; Appanoose, IA; Audubon, IA; Black Hawk, IA; Boone, IA; Calhoun, IA; Carroll, IA; Cass, IA; Clarke, IA; Crawford, IA; Dallas, IA; Davis, IA; Decatur, IA; Greene, IA; Grundy, IA; Guthrie, IA; Hamilton, IA; Hardin, IA; Jasper, IA; Lucas, IA; Madison, IA; Mahaska, IA; Marion, IA; Marshall, IA; Monroe, IA; Polk, IA; Poweshiek, IA; Ringgold, IA; Sac, IA; Story, IA; Tama, IA; Taylor, IA; Union, IA; Wapello, IA; Warren, IA; Wayne, IA; Webster, IA |
| Sent | Thursday, June 11, 2026 2:15 AM CDT |
| Expires | Thursday, June 11, 2026 10:00 AM CDT |
| Sender | NWS Des Moines IA |
| Id | urn:oid:2.49.0.1.840.0.e23971eb66133a16098c15ed83933e34925a7b3e.001.1 |