URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 172
NWS Storm Prediction Center Norman OK
1000 PM CDT Fri Apr 28 2017
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Northwestern Arkansas
Southern Illinois
Southern Missouri
Northeast and east central Oklahoma
* Effective this Friday night and Saturday morning from 1000 PM
until 500 AM CDT.
* Primary threats include...
Scattered large hail likely with isolated very large hail events
to 2.5 inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Thunderstorms will gradually increase in coverage and
intensity in a band from southern Illinois to southern
Missouri/northwestern Arkansas and adjacent parts of eastern
Oklahoma, and the storms will persist well into the overnight hours.
Supercells will be possible within the broader area of convection,
which will locally enhance the risk for large hail and damaging
winds. Though most of the storms will be rooted slightly above the
surface, and isolated tornado or two cannot be ruled out overnight.
The severe thunderstorm watch area is approximately along and 35
statute miles north and south of a line from 80 miles east of
Carbondale IL to 60 miles southwest of Tulsa OK. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU2).
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 170...WW 171...
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 550. Mean storm motion vector
26035.
...Thompson
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