Heavy Rain and Mountain Snow Lingers in California; Winter Storm Impacting the Great Lakes and Northeast U.S.

An atmospheric river will wind down through today across California with lingering heavy rainfall, heavy mountain snow, and gusty winds. A wintry mix of freezing rain, sleet, and snow will cause hazardous travel conditions for the Great Lakes into the northern Mid-Atlantic and southern New England today through Saturday morning. Areas of tree damage and power outages are possible. Read More >

Overview

Supercell thunderstorms produced severe weather on the evening of September 24, 2019. A strong tornado developed in Elk Mound, WI and strengthened to an EF3 as it went through Wheaton, WI.

A very favorable environment capable of producing supercells and tornadoes was in place and a Tornado Watch was issued at 445 PM. Gradual development of thunderstorms occurred during the early evening with widespread storms stretching from northwestern Iowa, southern Minnesota, into western and northern Wisconsin. A few became severe, but the number of storms probably limited most from becoming as strong as they could have alone.

The supercell that produced the strong EF3 tornado was an exception. It rapidly intensified and went on to produce the first September EF3 tornado in Wisconsin since Ladysmith on 9/2/2002 and the last EF3 tornado this late in the season occurred on 9/28/1971.

Velocity image as the tornado was developing. Reds indicate wind moving away from the radar (WFO La Crosse) and green indicated toward.

Tornado
Photos & Video
Radar

Tornado:

Tornado - Elk Mound/Wheaton, WI
Dunn, Chippewa Counties

Date	9/24/2019
Time (Local)	7:48-7:58 PM CDT
EF Rating	EF3
Est. Peak Winds	150 MPH
Path Length	5.5 miles
Max Width	1/3 mile
Injuries/Deaths	3/0
Summary: The most significant damage occurred in Wheaton, WI just east of Elk Mound around the intersection of CR M and WI-29. This area saw entire groves of trees leveled, some stripping of bark, and the destruction of several structures. The destruction of a metal building and two nearby homes were consistent with expected damage from winds of EF3 in strength.

Track Map

Track Map

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

Photos & Video


House destroyed. Photo by: NWS damage survey	Photo by: NWS damage survey	Photo by: NWS damage survey	Photo by: Branden Bodendorfer

Radar

4-Panel showing reflectivity (upper left), velocity (upper right), differential reflectivity (lower left), and correlation coefficient (lower right).


7:46 PM - 2 minutes before spin up	7:51 PM - Debris is starting to be picked up by radar by the little green dot in the CC image (lower right) just northeast of the tornado report icon.	7:55 PM - Much more debris is now being picked up as the tornado matures to EF3 strength.	7:58 PM - The tornado is ending, but the debris is still high up in the atmosphere.

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Heavy Rain and Mountain Snow Lingers in California; Winter Storm Impacting the Great Lakes and Northeast U.S.

Elk Mound/Wheaton, WI Tornado Rated EF3