Overview
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Multiple rounds of severe thunderstorms impacted the region on April 27th and 28th. The first round of storms arrived during the early morning hours of the 27th, associated with a warm front lifting northeast across the region. These were elevated, so large hail was the main impact from these. Additional isolated to scattered storms developed during the afternoon into the early evening, with large hail and damaging winds associated with a few of them. A broken line of supercells then moved in from the west during the mid to late evening, lingering into the early overnight over western Kentucky. This round produced additional scattered reports of wind damage and large hail. A portion of this line strengthened and produced 2 tornadoes in the Pennyrile of west Kentucky around midnight. Additional severe storms impacted southern portions of southeast Missouri on the afternoon of April 28th. Large hail and winds in excess of 70 mph were associated with this bowing segment as it dove east-southeast from south central Missouri into the bootheel and northwest Tennessee. A more intense pocket of wind known as a macroburst produced winds up to 100 mph across portions of Ripley County Missouri. |
Tornadoes
Select a tornado from the table to zoom into the track and view more information. The default table view is limited to 8 tracks, but can be scrolled by a mouse wheel or dynamically expanded. Additionally, the table can fill the entire window by clicking the small circular expanding arrow icon at the very top right of the table and returned to its original size by clicking the button again. The side information panel that opens over the map can be closed using the "X" on the upper right corner of the pop-up. Zoom into the map and click damage points to see detailed information and pictures from the surveys.
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NOTE: times shown below are local to your device's time zone. |
The Enhanced Fujita (EF) Scale classifies tornadoes into the following categories:
| EF0 Weak 65-85 mph |
EF1 Moderate 86-110 mph |
EF2 Significant 111-135 mph |
EF3 Severe 136-165 mph |
EF4 Extreme 166-200 mph |
EF5 Catastrophic 200+ mph |
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| Tornadoes that fail to impact any ratable damage indicators on the EF-Scale are rated EF-Unknown (EF-U) | |||||
Wind & Hail
Wind
Scattered reports of wind damage occurred both days, but the most pronounced event occurred in Ripley County Missouri on the afternoon of the 28th. A macroburst impacted southeastern portions of the county with winds up to 100 mph. The intense wind damage was located primarily along and just south of Hwy 142 which included the communities of Oxly and Naylor.
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Hail
Scattered reports of quarter to half dollar sized hail were received with each round of storms. There were even a few instances of golf ball to egg sized hail.
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| Hail in Grayville, IL via Jeff Lyons | Hail damage in Selvin, IN (Warrick County) via Wayne Hart |
Rain Reports
Portions of the region received 2 to 3" of rain, particularly across parts of southern Illinois and southwest Indiana. This led to some flooding issues.
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| 48 hour rainfall totals ending at 1 AM April 29th |
Environment
The synoptic environment featured an ejecting upper level jet across the Missouri Valley along with a pronounced mid level wave moving through. A strengthening low level jet was also present as we moved into the evening.
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| 850mb chart at 7 PM April 27 | 500mb chart at 7 PM April 27 | 300mb chart at 7 PM April 27 |
A surface low was depicted near St Louis during the early evening on the 27th with a trail cold front extending southwestward. A broken band of supercells developed along this and eventually attempted to congeal into more linear segments as it moved into southern Illinois, while remaining rather discrete in southeast Missouri. Mixed Layer CAPE was quite high ahead of the frontal boundary, with values of 2500-3500 J/kg. Deep layer shear of 45-50 kts was certainly supportive of supercell development.
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| Surface analysis at 6 PM April 27 | MLCAPE at 7 PM April 27 | 0-6 km shear at 7 PM April 27 |
The parameter space in place was very conducive for tornadoes. Mid level lapse rates of 8 C were also quite favorable for very large hail formation.
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| STP (Significant Tornado Parameter) at 7 PM April 27 | Mid Level Lapse Rates at 1 PM April 27 | Effective SRH (Storm Relative Helicity) at 10 PM April 27 |
Additional Information
The Forecast
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| Weather Story issued on April 23rd | Weather Story issued on April 27th |
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