675
WWUS20 KWNS 300122
SEL9
SPC WW 300122
IAZ000-300700-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 559
NWS Storm Prediction Center Norman OK
825 PM CDT Tue Jul 29 2025

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Northwest Iowa

* Effective this Tuesday night and Wednesday morning from 825 PM
  until 200 AM CDT.

* Primary threats include...
  Scattered damaging wind gusts to 70 mph likely
  Isolated large hail events to 1 inch in diameter possible

SUMMARY...Ongoing convective line across far southeast South Dakota
and northeast Nebraska is expected to continue southeastward into
northwest Iowa this evening. The airmass across much of western and
central Iowa is very unstable, supporting a continued threat for
strong to severe wind gusts as the line moves through the region.

The severe thunderstorm watch area is approximately along and 50
statute miles north and south of a line from 25 miles north of Sioux
City IA to 45 miles south of Fort Dodge IA. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU9).

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 556...WW 557...WW 558...

AVIATION...A few severe thunderstorms with hail surface and aloft to
1 inch. Extreme turbulence and surface wind gusts to 60 knots. A few
cumulonimbi with maximum tops to 500. Mean storm motion vector
27035.

...Mosier