852
WWUS20 KWNS 190231
SEL8
SPC WW 190231
IAZ000-MOZ000-190900-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 228
NWS STORM PREDICTION CENTER NORMAN OK
930 PM CDT MON MAY 18 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
EASTERN IOWA
NORTHEAST MISSOURI
* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 930 PM
UNTIL 400 AM CDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY
SCATTERED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE
A TORNADO OR TWO POSSIBLE
SUMMARY...A LINE OF THUNDERSTORMS CURRENTLY ONGOING FROM CENTRAL
IOWA THROUGH NORTH-CENTRAL/NORTHWEST MISSOURI IS EXPECTED TO
CONTINUE EASTWARD/SOUTHEASTWARD THIS EVENING. ENVIRONMENTAL
CONDITIONS SUPPORT A CONTINUED RISK OF DAMAGING GUSTS. A
LOW-PROBABILITY THREAT FOR BRIEF LINE-EMBEDDED TORNADOES IS POSSIBLE
AS WELL.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 30
STATUTE MILES EAST AND WEST OF A LINE FROM 55 MILES NORTH NORTHEAST
OF CEDAR RAPIDS IA TO 15 MILES SOUTH SOUTHWEST OF JEFFERSON CITY MO.
FOR A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH
OUTLINE UPDATE (WOUS64 KWNS WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
OTHER WATCH INFORMATION...CONTINUE...WW 225...WW 227...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60 KNOTS. A
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM MOTION VECTOR
24035.
...MOSIER
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