National Weather Service United States Department of Commerce

Overview

On Friday, March 14th, an unseasonably strong low pressure system lifted across the Great Plains and into the Midwest. The resulting tight pressure gradient ahead of that cyclone resulted in strong southerly winds that advected an unseasonably warm airmass into the region. In fact, a high temperature record was broken in Peoria and tied in Lincoln and Springfield, hitting 82 and 83 degrees respectively.

Because the airmass was seasonably dry and sunshine was plentiful during the afternoon, deep mixing brought some of the strong winds aloft down to the surface, with many sites gusting over 50 mph outside of thunderstorms. Springfield Capitol Airport had the highest reliable, measured non-convective gust of 59 mph. A few locations reported downed tree limbs and powerlines, and there was even one report of a collapsed pavilion at a park in Oakford (Menard County).

Two areas of thunderstorms then developed upstream: the first, a bowing line of storms lifting north-northeast across much of Iowa; the second, a mix of bowing linear structures and supercells moving east-northeast across Missouri. Shortly before 9pm, those storms entered the NWS Central Illinois County Warning Area (CWA), becoming increasingly linear north of roughly I-72 but maintaining supercell-like structure further south. Strong wind shear from a strengthening low-level jet (winds reached 75-80kt at 1km AGL) maintained the line of storms as they moved east across central IL, and unsurprisingly scattered to widespread damaging straight-line winds continued even where there wasn't thunder. Further south, near the I-70 corridor, dewpoints climbed into the low to mid 50s favoring lowering LCLs (lifting condensation level). In addition, surface winds backed, locally increasing SRH values to over 1000 m^2/s^2 and favoring a continued tornado risk. The most dangerous storm of the evening went through extreme northern Cumberland and much of Coles Counties where a debris signature on correlation coefficient (doppler radar dual pol product) corresponding with strong rotational velocity allowed us to confirm a tornado on radar.

The storms festered until around 3 am Saturday morning, when activity weakened and simultaneously shifted east into Indiana.

Preliminary findings from our damage surveys determined there were 8 tornadoes. Two EF-2s and six EF-1s.

**Stay tuned for further updates in the coming days**

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Radar loop from the night of Friday, March 14 into the early morning hours of Saturday, March 15.

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.

How to Use the Map

NOTE: times shown below are local to your device's time zone.

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EF-Scale

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
ef-scale
Tornadoes that fail to impact any ratable structures on the EF-Scale are rated EF-Unknown (EF-U)
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