The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
central and eastern Iowa
southern and central Minnesota
* effective this Sunday afternoon and evening from 110 PM until
900 PM CDT.
* Primary threats include...
a few tornadoes possible
several damaging wind gusts to 65 mph possible
a few large hail events to 1.5 inches in diameter possible
The Tornado Watch area is approximately along and 105 statute
miles east and west of a line from 70 miles north northeast of
Redwood Falls Minnesota to 25 miles south southeast of Waterloo
Iowa. For a complete depiction of the watch see the associated
watch outline update (wous64 kwns wou0).
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 179...
Discussion... thunderstorm activity is expected to continue to
increase and intensify near a convectively generated cyclonic
vorticity center as it migrates northward from Iowa into southern
Minnesota this afternoon. Aided by ambient vertical vorticity... and
boundary layer destabilization... supercell structures are
possible... with a risk for tornadoes... in addition to large hail and
potentially damaging wind gusts.
Aviation... tornadoes and a few severe thunderstorms with hail
surface and aloft to 1.5 inches. Extreme turbulence and surface
wind gusts to 55 knots. A few cumulonimbi with maximum tops to
450. Mean storm motion vector 26030.