Tornadic Title of Event

April 23rd, 2010 (Calibri 20 pt. – BOLD) St. Louis

All sections have a title Overview Calibri (Body) 16 pt. – BOLD Intermittent reports of wall clouds, funnel clouds, and tornadoes accompanied a supercell thunderstorm as it moved from southern Warren County to Lincoln County in Missouri during the evening of April 23rd, 2010. The supercell became tornadic just as it crossed the warm front, likely ingesting a vorticity rich environment. The storm All of the descriptive text is written in moved fairly slow, compared to most of the storms that we experience around here, moving only 25 to 35 mph to the northeast. Spotters, chasers, and local law enforcement captured photos of the classic supercell, but thankfully little Calibri (Body) 11 pt. if any damage was confirmed with the sporadic weak touchdowns. General Ordering of Content The tornado was classified an EF0 on the Enhanced and had an intermittent track of 22 miles from the first confirmed touchdown 4 miles northwest of Warrenton to the final report 5 miles northeast of Silex. Below are some photos of the wall cloud and funnel, along with a reflectivity image of the supercell and hook 1) Overview Section giving a echo near Hawk Point. description of the event 2) Overview Map - damage tracks map, hail swath graphic, and/or wind damage graphic 3) Any environmental maps and description 4) List of any storm reports 5) Maps, pictures, and information from any damage surveys including specific tornado tracks; pictures of hail; pictures of any type of damage 6) Any radar data and description 7) Final page with data disclaimer and webmaster contact

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National Weather Service St. Louis Missouri 1 Pictures

Wall cloud visible northwest of Warrenton in Warren County, Missouri

Wall cloud and Funnel Cloud near Hawk Point in Lincoln County, Missouri

Wall cloud visible west of Troy in Lincoln County, Missouri

National Weather Service St. Louis Missouri 2 Please note that while the data presented in this event synopsis has been quality controlled, it is still considered unofficial. Official reports & statistics for severe weather events can be found in the publication (http://www.ncdc.noaa.gov/IPS/sd/sd.html) or Storm Events Database http://www.ncdc.noaa.gov/stormevents/), available from the National Centers for Environmental Information (NCEI) web page [formerly the National Climate Data Center (NCDC)].

More detailed tornado track information can be accessed using the National Weather Service Damage Assessment Toolkit for all tornadoes beginning in 2012. https://apps.dat.noaa.gov/StormDamage/DamageViewer/

Any questions regarding this event review should be address to [email protected]

National Weather Service St. Louis Missouri 3