Day: September 19, 2024
SPC Severe Thunderstorm Watch 677
WW 677 SEVERE TSTM IA MN WI 191910Z – 200300Z 
URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 677 NWS Storm Prediction Center Norman OK 210 PM CDT Thu Sep 19 2024 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Northern Iowa Southern and East-Central Minnesota Western Wisconsin * Effective this Thursday afternoon and evening from 210 PM until 1000 PM CDT. * Primary threats include... Scattered large hail likely with isolated very large hail events to 2.5 inches in diameter possible Scattered damaging wind gusts to 70 mph possible A tornado or two possible SUMMARY...Thunderstorms should continue to develop this afternoon while posing a threat for large hail up to 1.5-2.5 inches in diameter. As this activity spreads east-northeastward, damaging winds around 60-70 mph may become more of a threat through this evening, especially if thunderstorms can form into clusters. A tornado or two also appears possible with any persistent, surface-based supercell. The severe thunderstorm watch area is approximately along and 75 statute miles east and west of a line from 45 miles north northwest of Eau Claire WI to 15 miles southwest of Mason City IA. 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 2.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean storm motion vector 24030. ...Gleason
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