The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
* effective this Sunday afternoon and evening from 300 PM until
1000 PM CDT.
* Primary threats include...
a few tornadoes possible
several damaging wind gusts to 70 mph possible
a few large hail events to 1.5 inches in diameter possible
The Tornado Watch area is approximately along and 55 statute
miles north and south of a line from 45 miles north northwest of
Shenandoah Iowa to 40 miles north of Burlington Iowa. For a
complete depiction of the watch see the associated watch outline
update (wous64 kwns wou3).
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... ww 180... ww
181... ww 182...
Discussion... storm development continues southward toward the
Missouri border... along a wind shift associated with the
convectively generated cyclonic vorticity center migrating northward
through the upper Mississippi Valley. Additional storms continue to
develop and intensify... while spreading northeastward across the
middle Missouri Valley... in the exit region of the next mid-level
jet strong nosing through the Central Plains. Strongest storms may
include a few supercells across the watch area into early
evening... with a risk for large hail... locally damaging wind gusts
and potential for tornadoes.
Aviation... tornadoes and 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
500. Mean storm motion vector 24035.