WWUS20 KWNS 102141 SEL7 SPC WW 102141 ARZ000-OKZ000-110400- URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 7 NWS Storm Prediction Center Norman OK 345 PM CST Sat Mar 10 2018 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Central and Western Arkansas Eastern Oklahoma * Effective this Saturday afternoon and evening from 345 PM until 1000 PM CST. * Primary threats include... Scattered large hail likely with isolated very large hail events to 2 inches in diameter possible Isolated damaging wind gusts to 70 mph possible SUMMARY...Thunderstorms will continue to increase in coverage this afternoon and evening, with a few severe storms possible. Large hail is the main risk. The severe thunderstorm watch area is approximately along and 65 statute miles north and south of a line from 40 miles west northwest of Fort Smith AR to 35 miles northeast of Monticello AR. For a complete depiction of the watch see the associated watch outline update (WOUS64 KWNS WOU7). 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. && 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 400. Mean storm motion vector 28030. ...Hart