Storms including a few supercells spreading off the higher terrain and moving into a moderately unstable environment will pose a risk for large hail damaging wind this afternoon and evening.
SEL0 URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 510 NWS Storm Prediction Center Norman OK 250 PM MDT Mon Jul 15 2019 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of western and north central Nebraska southwestern South Dakota eastern Wyoming * Effective this Monday afternoon and evening from 250 PM until 1000 PM MDT. * Primary threats include... Scattered large hail and isolated very large hail events to 2 inches in diameter possible Scattered damaging wind gusts to 70 mph possible SUMMARY...Storms including a few supercells spreading off the higher terrain and moving into a moderately unstable environment will pose a risk for large hail damaging wind this afternoon and evening. The severe thunderstorm watch area is approximately along and 145 statute miles east and west of a line from 80 miles northwest of Rapid City SD to 55 miles south southeast of Alliance 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 509... AVIATION...A few severe thunderstorms with hail surface and aloft to 2 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 27035. ...Dial
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