The NWS Storm Prediction Center has issued a

• Tornado Watch for portions of
  Central and Eastern Iowa
  Northern and West-Central Illinois
  Southeast Minnesota
  Far Northeast Missouri
  Central and Southern Wisconsin
• Effective this Friday afternoon and evening from 1240 PM until
  800 PM CDT.
• Primary threats include…
  A few tornadoes likely with a couple intense tornadoes possible
  Widespread large hail and isolated very large hail events to 3.5
  inches in diameter likely
  Scattered damaging wind gusts to 70 mph likely

SUMMARY…A very moist and unstable airmass exists ahead of a cold
front progressing eastward/southeastward across the region.
Thunderstorm development is anticipated within the warm sector ahead
of the front, where discrete supercells capable of all severe
hazards, including very large hail and strong to intense tornadoes,
are possible. Thunderstorm development is possible along the front
as well, with large hail and strong gusts the primary risk with
these storms.

The tornado watch area is approximately along and 110 statute miles
north and south of a line from 55 miles north northwest of Des
Moines IA to 55 miles east of Madison WI. For a complete depiction
of the watch see the associated watch outline update (WOUS64 KWNS
WOU9).

PRECAUTIONARY/PREPAREDNESS ACTIONS…

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 128…

AVIATION…Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 26035.