421
WWUS20 KWNS 202155
SEL0
SPC WW 202155
NEZ000-SDZ000-210500-

URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 440
NWS Storm Prediction Center Norman OK
455 PM CDT Thu Jun 20 2024

The NWS Storm Prediction Center has issued a

* Severe Thunderstorm Watch for portions of
  Northern Nebraska
  Extreme southern South Dakota

* Effective this Thursday afternoon from 455 PM until Midnight
  CDT.

* Primary threats include...
  Scattered large hail and isolated very large hail events to 3.5
    inches in diameter possible
  Scattered damaging wind gusts to 70 mph possible
  A tornado or two possible

SUMMARY...An isolated supercell should persist along a warm front
over the northern Sandhills, offering all severe hazards, including
a localized tornado threat.  In the broader picture, a clustering of
severe thunderstorms in the Nebraska Panhandle should move into and
across the watch later this evening, posing mainly a hail and
severe-wind threat.  Isolate severe hail also is possible with later
development north of the front.

The severe thunderstorm watch area is approximately along and 55
statute miles north and south of a line from 50 miles west of Mullen
NE to 15 miles east northeast of Oneill NE. 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 438...WW 439...

AVIATION...A few severe thunderstorms with hail surface and aloft to
3.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 550. Mean storm motion vector
26025.

...Edwards