URGENT - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Watch Number 447 NWS Storm Prediction Center Norman OK 620 PM CDT Fri Aug 21 2020 The NWS Storm Prediction Center has issued a * Severe Thunderstorm Watch for portions of Southwestern to south-central Minnesota * Effective this Friday night and Saturday morning from 620 PM until 200 AM CDT. * Primary threats include... Isolated damaging wind gusts to 70 mph possible Isolated large hail events to 1.5 inches in diameter possible SUMMARY...A growing cluster of severe thunderstorms, aided by lift related to an MCV and potentially a rear-inflow jet, now appears to have continued upscale-organization potential, and should affect the watch area through late evening. Damaging gusts will be the main concern, though isolated severe hail is possible. The severe thunderstorm watch area is approximately along and 60 statute miles north and south of a line from 75 miles northwest of Redwood Falls MN to 20 miles east southeast of Mankato MN. 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 1.5 inches. Extreme turbulence and surface wind gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean storm motion vector 30030. ...EdwardsRead more
from SPC Forecast Products http://www.spc.noaa.gov/products/watch/ww0447.html
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