WW 474 SEVERE TSTM ND SD WY 112040Z – 120300Z
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 474
NWS Storm Prediction Center Norman OK
240 PM MDT Tue Jul 11 2023
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Western North Dakota
Western South Dakota
Northeast Wyoming
* Effective this Tuesday afternoon and evening from 240 PM until
900 PM MDT.
* Primary threats include...
Scattered damaging winds and isolated significant gusts to 75
mph possible
Scattered large hail and isolated very large hail events to 2.5
inches in diameter possible
A tornado or two possible
SUMMARY...Thunderstorm coverage is expected to increase this
afternoon and evening as the airmass across the western Dakotas and
northeast Wyoming continues to destabilize. Moderate buoyancy and
strong vertical shear is in place, with some supercells anticipated.
Large to very large hail and damaging gusts are the primary severe
risks, but a tornado or two is possible as well.
The severe thunderstorm watch area is approximately along and 65
statute miles east and west of a line from 60 miles south southwest
of Rapid City SD to 50 miles north of Dickinson ND. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU4).
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 473...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2.5 inches. Extreme turbulence and surface wind gusts to 65 knots. A
few cumulonimbi with maximum tops to 500. Mean storm motion vector
28030.
...Mosier
