Remember to check out severe weather outlook for more severe weather and cyclocane for hurricanes. US Dept of Commerce a focus such as a cold front. Briefing Page Tornado Maps for the State of Illinois and Each County Dr. Jim Angel, State Climatologist. The ingredients are effective storm-relative helicity, most unstable CAPE (muCAPE), and effective bulk wind difference. warmth and moisture, which create instability  2.) The Lifting Condensation Level (LCL) is the pressure level at which air reaches saturation upon being lifted. Holiday Climate Data correspond to each SPC storm risk category. Using Grazulis’ data from 1885 through 1949 and NWS data from 1950 through 2012, there were 30 F2 tornadoes and 8 F3 tornadoes documented in Illinois in the month of November. El Nino Measured in Joules per kilogram (j/kg), values near or over 500-1,000 j/kg are often about the low-end needed for widespread severe weather chances. Great Lakes Marine Portal Late Autumn Tornado Events in the Region: Storm Prediction Center Outlook Issued the Morning of November 17th, Particularly Dangerous Situation Tornado Watch Issued 8:40 am on November 17th, NWS Tornado Warnings Issued on November 17, 2013, Hazards Enhanced Hazardous Weather Outlook Tornadoes also occur in severe thunderstorm watches fairly frequently. Text Products Note that eight of the November tornadoes have been EF-2 or stronger, showing that when tornadoes do occur in November, there is a decent likelihood they will be significant (EF-2 or stronger). Probably stormy. Severe weather forecasting tip sheat (NWS, PDF). Ice? Since the Illinois tornado, there have been other radar observations and photographs made of tornado echoes by several other radar research groups. Consequently, it may be concluded that radar is capable of detecting tornado situations under favorable conditions, and that meteorologists have a new tool for the investigation of the causes of tornado formation. If a hatched area is included in the image, which is only done with probabilities of 10 percent or higher, strong tornadoes are more of a concern than normal. Snow and Ice Probabilities, Current Conditions This leads to even greater wind shear. November tornadoes to occur in the NWS Chicago CWA since 1950: The greatest number of significant tornadoes (F2 or greater) in a November outbreak was seven F2 tornadoes on November 12, 1965. The moisture also aided in keeping cloud bases lower, an ingredient often seen in significant tornado events. More details can be found here. Day three severe weather outlook | Days 4-8 severe weather outlook, NASA Regional Viewer (Visible, Infrared, Water Vapor) | GOES-14 SRSOR Imagery 1 min scans (not always available). strong turning winds with height, creating wind shear and 3.) The first documented association between a hook echo and a confirmed tornado occurred near Urbana-Champaign, Illinois on 9 April 1953. Current Conditions Fourth Largest Outbreak Tornadoes in Illinois, Supercell-Centric Reflectivity View, 10:30 am - 1:10 pm, This loop is from the NWS Lincoln and Chicago Radars, 0.5° Reflectivity. Sorry, the location you searched for was not found. And this instability was actually off the charts for November. Values greater than 1 have been associated with a majority of tornadoes that have been rated significant/strong (which is a rating of F/EF2 or greater). Track storms, and stay in-the-know and prepared for what's coming. LCLs are often lower in a storm environment than shown in a large-scale analyses like above. much of this increase is explained by...1.) Chicago, IL333 West University DriveRomeoville, IL 60446815-834-1435 8am-8pmComments? Watches, either tornado (red) or severe thunderstorm (blue), indicate that storms are likely to pose the highlighted threat. The primary reason for this is strong dynamics and wind field that tend to be present in the cool season (late autumn and winter), which add to a greater amount of wind shear. Latest weather radar images from the National Weather Service. SPC has a graphic covering differences. If CAPE is zero, the atmosphere is stable. Jetstream U.S. observations, including wind speed and direction. Tweets by @NWStornado Values lower, say between 30 and 40 knots, may also support supercells or supercell structures depending on the terrain and other ingredients.