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(7/24/2009 9:49:39 PM) nwsbot: MKX: 2 Se Delavan [Walworth Co, WI] public reports NON-TSTM WND GST of M46 MPH at 07:15 PM CDT — measured on a privately owned weather station near delavan lake. wind gusts occurred due to a wake low.
(7/24/2009 8:46:23 PM) nwsbot: MKX: Beloit [Rock Co, WI] law enforcement reports NON-TSTM WND DMG at 08:15 PM CDT — from 745 pm to 815 pm…strong winds and tree damage reported in several locations in the beloit area. the wind was due to a wake low.
(10:22:43 PM) nwsbot: DVN: Sterling [Whiteside Co, IL] emergency mngr reports FLASH FLOOD at 09:40 PM CDT — a half mile stretch of route 40 in town is closed due to water over the road. water is 4-5 inches deep in places.
(9:58:45 PM) nwsbot: LOT: 5 Nw Polo [Ogle Co, IL] co-op observer reports HEAVY RAIN of M1.19 INCH at 09:55 PM CDT —
(9:18:54 PM) nwsbot: LOT: Winnebago [Winnebago Co, IL] broadcast media reports TSTM WND GST of E60 MPH at 09:10 PM CDT — reported by wrex tv.
(7/24/2009 8:13:14 PM) nwsbot: MKX: 4 S Janesville [Rock Co, WI] awos reports NON-TSTM WND GST of M44.00 MPH at 07:45 PM CDT — measured from the janesville airport due to a wake low
(7/24/2009 8:07:28 PM) nwsbot: DVN: 1 E Galena [Jo Daviess Co, IL] law enforcement reports TSTM WND DMG at 06:55 PM CDT — *** 1 inj *** semi truck blown over on top of passenger car at hwy 20 and mount hope rd resulting in 1 injury. also trees down in the same area.
(7:39:34 PM) nwsbot: DVN issues Severe Thunderstorm Warning for Clinton, Jackson [IA] and Carroll, Rock Island, Whiteside [IL] till 8:45 PM CDT
(7:11:42 PM) nwsbot: LOT issues Severe Thunderstorm Warning for Lee, Ogle [IL] till 8:15 PM CDT
(7:08:08 PM) nwsbot: MKX cancels Tornado Watch for Green, Iowa, Lafayette [WI]
(7:08:53 PM) nwsbot: DVN: Elizabeth [Jo Daviess Co, IL] public reports HAIL of nickel size (M0.88 INCH) at 07:07 PM CDT — along with heavy rain.
(7:01:42 PM) nwsbot: DVN: Council Hill [Jo Daviess Co, IL] trained spotter reports HAIL of golf ball size (M1.75 INCH) at 06:49 PM CDT — ping pong to golf ball size hail.
(6:53:35 PM) nwsbot: DVN: 3 Wsw Freeport [Stephenson Co, IL] trained spotter reports TSTM WND DMG at 06:51 PM CDT — 4 to 6 inch tree limbs down 1.10 inches of rain in 15 minutes.
(6:52:38 PM) nwsbot: DVN: 5 Sse Council Hill [Jo Daviess Co, IL] trained spotter reports HEAVY RAIN of E0.50 INCH at 06:52 PM CDT — in the last 20 minutes
(6:47:49 PM) nwsbot: DVN: Scales Mound [Jo Daviess Co, IL] law enforcement reports FUNNEL CLOUD at 06:42 PM CDT — rapid rotation over town reported by fire department.
(6:26:23 PM) nwsbot: DVN: 2 N Pearl City [Stephenson Co, IL] trained spotter reports HAIL of nickel size (E0.88 INCH) at 06:25 PM CDT —
(6:19:08 PM) nwsbot: DVN issues Severe Thunderstorm Warning for Dubuque, Jackson [IA] and Jo Daviess [IL] till 7:30 PM CDT
(6:10:53 PM) nwsbot: LOT issues Severe Thunderstorm Warning for Ogle [IL] till 7:15 PM CDT
(6:22:24 PM) nwsbot: LOT continues Severe Thunderstorm Warning for Ogle [IL] till 7:15 PM CDT
(6:11:00 PM) nwsbot: DVN: 4 Ene Stockton [Jo Daviess Co, IL] amateur radio reports HAIL of golf ball size (M1.75 INCH) at 06:04 PM CDT — measured winds of 35 mph.
(6:11:01 PM) nwsbot: DVN: 3 S Stockton [Jo Daviess Co, IL] public reports HAIL of golf ball size (M1.75 INCH) at 06:09 PM CDT —
(6:09:24 PM) nwsbot: DVN: Stockton [Jo Daviess Co, IL] co-op observer reports HAIL of egg size (M2.00 INCH) at 06:07 PM CDT — mostly golfball hail…with a few up to 2 inches.
(6:02:06 PM) nwsbot: DVN: Apple River [Jo Daviess Co, IL] amateur radio reports HAIL of golf ball size (M1.75 INCH) at 05:52 PM CDT —
(6:02:06 PM) nwsbot: DVN: 2 N Stockton [Jo Daviess Co, IL] amateur radio reports HAIL of tennis ball size (M2.50 INCH) at 05:58 PM CDT —
(5:43:58 PM) nwsbot: DVN: 2 E Scales Mound [Jo Daviess Co, IL] law enforcement reports HAIL of golf ball size (M1.75 INCH) at 05:38 PM CDT — half dollar to golfball size hail.
(5:15:21 PM) nwsbot: DVN issues Severe Thunderstorm Warning for Jo Daviess, Stephenson [IL] till 6:15 PM CDT
(4:57:58 PM) nwsbot: Storm Prediction Center issues TORNADO watch till 04:00 UTC , new watch replaces WW 616, WW 617 (Watch Quickview)
(4:36:10 PM) nwsbot: ARX: Stitzer [Grant Co, WI] emergency mngr reports HAIL of golf ball size (M1.75 INCH) at 04:33 PM CDT —
(4:36:20 PM) nwsbot: MKX continues Severe Thunderstorm Warning for Iowa, Lafayette [WI] till 6:00 PM CDT
4:27pm – Our live weatherblog chat is coming soon…as is a new weather watch.
This report came in from the supercell in Iowa earlier this afternoon. Wow!
3 Nw Oneida [Delaware Co, IA] public reports HAIL of tennis ball size (M2.50 INCH) at 02:29 PM CDT — copious amounts of tennis ball size hail. car windshield cracked. delayed report.

4:00pm – Updated Mesoscale Discussion from the Storm Prediction Center for our area: http://www.s
pc.noaa.gov/products/md/md1661.html Storms over southwestern Wisconsin and northeastern Iowa are having little trouble developing (even under cloudy skies). May see some sort of weather watch for the area highlighted by 5pm this evening in advance of these storms. -ES
3:30pm – The Storm Prediction Center has taken Southern Wisconsin out of the slight risk of severe for this evening. I think that may have been premature as the atmosphere is recovering nicely along the cold front from Eau Claire to Mason City. Strong storms will be possible in the evening hours after a few hours of rain this afternoon. -ES

3:10pm – Davenport NWS Doppler radar’s latest scans are showing a nice scatter spike (or hail spike). This occurs when the radar beam enters the storm and bounces off of very large hail within the hail core. Radars work because radiation (or radar beam) is sent out from the radar…but it’s not until the radiation returns to the radar, that we know what’s going on. When there’s a significant thunderstorm with large hail like this, the beam is bouncing off of very large hailstones within the core. Because of this, it takes longer for the beam to make it back to the radar site because it’s been scattering. This time delay causes the reflectivity (colors) to be plotted further back than where they originally occured.
Backscatter or hail spikes only occur when there’s monster hail in that storm. It’s quite a distance (as the crow flies) from DVN’s radar so as the storm moves toward the radar site, the beam will be lower in the storm and the spike should go away. -ES

2:46pm – Here is a look at the helicity analysis for the area right now. Helicity is basically the tendency for a corkscrew motion in the atmosphere from bottom to top. Obviously, higher amounts of helicity indicate a higher chance for severe. As expected, this is centered over Rochester, Minnesota and La Crosse, Wisconsin this afternoon and will stay northwest of the area through the event.
2:41pm – Rain and embedded thunderstorms will affect the region from 3-6pm this afternoon. These storms will not reach severe thresholds. However there remains a slight risk of severe storms with a cold frontal passage between 8pm and midnight tongiht. -ES
Posted under severe weather