Tuesday, February 28, 2017

Severe Weather Tuesday evening

(5:04:22 PM) nwsbot: Local Storm Report by NWS LOT: De Kalb [De Kalb Co, IL] trained spotter reports HAIL of half inch size (E0.50 INCH) at 04:50 PM CST -- 

(5:04:57 PM) nwsbot: LOT continues Tornado Warning [tornado: OBSERVED, tornado damage threat: CONSIDERABLE, hail: 1.75 IN] for Grundy, Kendall, La Salle [IL] till 5:30 PM CST

(5:18:34 PM) nwsbot: Local Storm Report by NWS DVN: 3 ENE Rock Falls [Whiteside Co, IL] trained spotter reports HAIL of golf ball size (E1.75 INCH) at 04:58 PM CST -- largest slightly larger than golf balls.

(5:19:19 PM) nwsbot: Local Storm Report by NWS LOT: Marseilles [La Salle Co, IL] amateur radio reports TORNADO at 05:06 PM CST -- at the intersection of ne 30th and e 25th. electrical tower down blocking road and multiple buldings damaged. house with roof blown off. power line down on road.

Non-severe thunderstorms will continue with the passage of a cold front.  Severe weather will remain likely south of I-80 closer tied to the higher instability.  Storms moving through northern Illinois will remain heavy rain producers and could occasionally produce pea sized hail.

7:00pm Update: Tornado Watch canceled for Stephenson and Jo Daviess counties.  Will likely see a few more of these canceled early with the severe threat winding down.

5:30pm Update:  Severe Thunderstorm Warning continues for southeast Ogle, northern Lee and central DeKalb counties until 6pm.  This storm has produced nickel to quarter sized hail and is capable of producing wind gusts near 60 mph.  Cities in the path of this storm include: Steward, Rochelle, DeKalb, Malta, Creston and Genoa.

4:25pm Update:  Tornado Warning canceled for Whiteside County, however, a NEW Severe Thunderstorm Warning has been issued for Carroll and Whiteside counties until 5:30pm.

A Tornado Watch has been issued for all of Northern Illinois until 10pm Tuesday evening.  Thunderstorms have quickly developed ahead of an area of low pressure near the Quad Cities and along and south of a warm front riding along I-88.

With the rapid development of thunderstorms many of them have turned severe, including one storm that did produce a tornado in eastern Iowa and is currently moving into western Whiteside County.  There is a Tornado Warning for Whiteside County until 5pm.

Along and south of the warm front will be the focus for rotating thunderstorms and this looks to occur mostly south of the immediate area.  However Whiteside, Lee and DeKalb counties do need to remain alert because the warm front could make a little progress northward over the next couple of hours.

Non-severe thunderstorms have developed north of the boundary producing heavy rainfall and frequent lightning.  Hail would be the primary threat with those storms as they have become slightly elevated over top of a more stable air mass.

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