Tornado Watch Covers Parts of Illinois, Iowa, & Missouri, Including St. Louis


The NWS Storm Prediction Center has issued a
Tornado Watch for portions of

far eastern Iowa
western… central and northern Illinois
eastern Missouri

Effective this Sunday night and Monday morning from 610 PM until
100 am CDT.

Tornadoes… hail to 2 inches in diameter… thunderstorm wind
gusts to 70 mph… and dangerous lightning are possible in these
areas.

The Tornado Watch area is approximately along and 70 statute
miles east and west of a line from 20 miles north northwest of
Rockford Illinois to 50 miles east southeast of Jefferson City
Missouri. For a complete depiction of the watch see the
associated watch outline update (wous64 kwns wou2).

Remember… a Tornado Watch means conditions are favorable for
tornadoes and 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.

Other watch information… continue… ww 120… ww 121…

Discussion… tstms expected to increase in number and strength
through late eve along merging dry line… pre-frontal confluence
zone… and cold front from far ern IA swd into ern MO. Other storms
may form farther E along SSW-NNE band of confluence noted over cntrl
IL. While large scale ascent attm appears to be downward in wake of
passing upr impulse now entering WI… large scale ascent may
overspread later this eve as jet entrance region evolves ahead of
progressive larger scale upr trough. With sfc heating/low-lvl
convergence already having initiated convection/storms in ern IA/NE
MO… and with the expectation for increasing large scale uvv later
this eve… a potential will exist for sustained storms.
Long… slightly-hooked hodographs suggest possibility for
supercells/lewps with tornadoes… in addition to svr wind and hail.

Aviation… tornadoes and 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
550. Mean storm motion vector 24045.

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