436
WWUS20 KWNS 300453
SEL0
SPC WW 300453
IAZ000-MNZ000-NEZ000-SDZ000-300900-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 420
NWS STORM PREDICTION CENTER NORMAN OK
1155 PM CDT MON JUN 29 2026
THE NWS STORM PREDICTION CENTER HAS ISSUED A
* SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHWEST IOWA
EXTREME SOUTHWEST MINNESOTA
NORTHEAST NEBRASKA
EXTREME SOUTHEAST SOUTH DAKOTA
* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 1155 PM
UNTIL 400 AM CDT.
* PRIMARY THREATS INCLUDE...
SCATTERED DAMAGING WINDS AND ISOLATED SIGNIFICANT GUSTS TO 80
MPH LIKELY
SCATTERED LARGE HAIL AND ISOLATED VERY LARGE HAIL EVENTS TO 2
INCHES IN DIAMETER POSSIBLE
SUMMARY...STORMS IN NORTHEAST NEBRASKA HAVE SHOWN A TENDENCY TO
CLUSTER OVER THE PAST HOUR WITH AN INCREASE IN THE POTENTIAL FOR
SEVERE OUTFLOW GUSTS OF 60-80 MPH, AND THE CLUSTER IS EXPECTED TO
MOVE NORTHEASTWARD TOWARD NORTHWEST IOWA AND VICINITY. THE STRONGER
EMBEDDED STORMS WILL ALSO BE CAPABLE OF PRODUCING LARGE HAIL OF 1-2
INCHES IN DIAMETER.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 50
STATUTE MILES EAST AND WEST OF A LINE FROM 40 MILES SOUTHWEST OF
NORFOLK NE TO 35 MILES NORTH NORTHWEST OF SPENCER IA. FOR A COMPLETE
DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE UPDATE
(WOUS64 KWNS WOU0).
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 417...WW 418...WW 419...
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT TO
2 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70 KNOTS. A
FEW CUMULONIMBI WITH MAXIMUM TOPS TO 600. MEAN STORM MOTION VECTOR
24035.
...THOMPSON
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