Overview
Thunderstorms developed in arced bands during the warmth of the afternoon ahead of a strong low in the upper levels of the atmosphere. Several storms attained severe intensity, primarily over western Kentucky. The primary severe weather hazard was damaging winds, however there was a "landspout" tornado in southeast Missouri. A "landspout" tornado refers to a tornado spawned by a non-supercell thunderstorm. It usually occurs during the intense updraft stage of a developing shower or thunderstorm. It is typically not as long-lived or as strong as a supercell tornado, but it can be very impressive-looking.Storm Reports
PRELIMINARY LOCAL STORM REPORT...SUMMARY NATIONAL WEATHER SERVICE PADUCAH KY 723 PM CDT THU JUN 21 2018 ..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON... ..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE.... ..REMARKS.. 0150 PM TSTM WND GST CARTERVILLE 37.76N 89.08W 06/21/2018 E50.00 MPH WILLIAMSON IL TRAINED SPOTTER WIND GUSTS ESTIMATED 45 TO 50 MPH 0227 PM TSTM WND GST 2 WNW MARION 37.74N 88.98W 06/21/2018 M50.00 MPH WILLIAMSON IL TRAINED SPOTTER MEASURED NORTHWEST OF TOWN. 0248 PM FUNNEL CLOUD SCOTT CITY 37.22N 89.53W 06/21/2018 SCOTT MO FIRE DEPT/RESCUE BRIEF FUNNEL CLOUD. 0255 PM TSTM WND GST HARRISBURG 37.74N 88.55W 06/21/2018 E45.00 MPH SALINE IL TRAINED SPOTTER WIND GUSTS ESTIMATED 45 MPH AND PEA SIZE HAIL REPORTED WITH THIS STORM. 0335 PM TSTM WND GST MOUND CITY 37.09N 89.16W 06/21/2018 M55.00 MPH PULASKI IL EMERGENCY MNGR 0401 PM TSTM WND GST LA CENTER 37.07N 88.97W 06/21/2018 M50.00 MPH BALLARD KY EMERGENCY MNGR 0445 PM TSTM WND GST MAYFIELD 36.74N 88.65W 06/21/2018 E50.00 MPH GRAVES KY TRAINED SPOTTER 0510 PM TSTM WND GST CALVERT CITY 37.03N 88.35W 06/21/2018 M44.00 MPH MARSHALL KY NWS EMPLOYEE MEASURED WIND GUST 44 MPH. PEA SIZE HAIL REPORTED WITH THIS STORM. INTERMITTENT POWER OUTAGES. SEVERAL LARGE TREE LIMBS DOWN ALONG LONE VALLEY ROAD. 0510 PM TSTM WND DMG BENTON 36.85N 88.36W 06/21/2018 MARSHALL KY TRAINED SPOTTER TREE SNAPPED. REPORTED WITH PHOTO. WIND SPEED UNKNOWN. 0515 PM TSTM WND DMG 4 S CALVERT CITY 36.98N 88.35W 06/21/2018 MARSHALL KY NWS EMPLOYEE LATE REPORT...MULTIPLE TREES DOWN IN KENTUCKY DAM VILLAGE STATE PARK. TIME ESTIMATED. 0515 PM TSTM WND DMG PALMA 36.96N 88.38W 06/21/2018 MARSHALL KY FIRE DEPT/RESCUE LATE REPORT...WIDESPREAD TREE DAMAGE ALONG SUN BRYANT LANE. PORTABLE BUILDING MOVED OFF OF FOUNDATION. TIME ESTIMATED. 0533 PM TSTM WND DMG BENTON 36.85N 88.36W 06/21/2018 MARSHALL KY BROADCAST MEDIA REPORTED POWER OUTAGES ACROSS THE COUNTY. THIS IS FROM THE STORMS THAT PASSED THROUGH SHORTLY AFTER 5 PM. 0600 PM HEAVY RAIN ROCKCASTLE 36.90N 87.99W 06/21/2018 M0.70 INCH TRIGG KY TRAINED SPOTTER 20 MINUTE ACCUMULATION 0607 PM TSTM WND GST 2 E CADIZ 36.87N 87.79W 06/21/2018 E65.00 MPH TRIGG KY TRAINED SPOTTER WIND GUST ESTIMATED. BILLBOARD BLOWN OVER. 0627 PM TSTM WND GST HOPKINSVILLE 36.85N 87.49W 06/21/2018 E65.00 MPH CHRISTIAN KY TRAINED SPOTTER WIND GUST ESTIMATED. 0634 PM TORNADO CANALOU 36.75N 89.69W 06/21/2018 NEW MADRID MO LAW ENFORCEMENT TORNADO REPORTED BY STATE POLICE. TORNADO IS TOUCHING DOWN AND LIFTING. 0650 PM FUNNEL CLOUD 2 W EAST PRAIRIE 36.78N 89.42W 06/21/2018 MISSISSIPPI MO TRAINED SPOTTER Map of storm reports and warnings. Yellow polygons are Severe Thunderstorm Warnings and red polygons are Tornado Warnings. Not all plotted reports are severe events.
Environment
Thunderstorms developed in a region of moderately strong winds aloft as sunshine warmed and destabilized the atmosphere during the day. Severe Thunderstorm Watch 196 was issued by the Storm Prediction Center around 1:30 P.M. The storms weakened by early evening as the atmosphere stabilized.
Figure 1: Svr Tstm Watch 196 | Figure 2: 925 mb winds | Figure 3: 500 mb winds |
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