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Thank you for stopping by the Weather Watch 12 blog! A brief, and very weak tornado was reported in Dodge county 5 miles south of Theresa on Sunday. No watches or warnings were in place at the time, certainly a good reminder that severe weather can happen with no warning.
The good news is that no damage was reported, and the tornado lasted a very short time. The brief touchdown was reported by a trained weather spotter at 4:56pm. The isolated thunderstorm did show a small ‘hook echo’ on radar. Below is more information on what a ‘hook echo’ is from a great weather site by Jeff Haby.
A hook echo is displayed on radar reflectivity. It is a signature produced by precipitation held aloft that wraps around the mid-level mesocyclone. Since the mesocyclone has counterclockwise winds, the reflectivity signature of a hook echo will have a cyclonically shaped hook. The area free from reflectivity inside the hook is the updraft and inflow notch region of the supercell. A hook echo is one clue that a thunderstorm has the potential of producing a tornado.
Here is the NEXRAD radar image from our new Weather Watch 12 weather system at 4:50pm Sunday afternoon. The ‘hook echo’ is shown by the arrow, this is where the weak tornado was located.
Here is the spot where the tornado was reported by the trained spotter.
The next threat for showers and thunderstorms will be Monday. Again it will be difficult to pin down the timing, so I would keep an umbrella nearby from Monday all the way through Thursday of this week.
As a warm front lifts into the region on Tuesday, it will turn warmer and more humid. With the increase in moisture and temperature, and with a warm front hanging around the region…the potential for heavy rain and severe weather will be on the increase.
Let’s start with rainfall. Below is the RPM forecast that goes through Wednesday. While this is not how the final rain totals will shake out, this forecast does show that heavy rain is possible across a large part of the upper Midwest. Milwaukee is labeled with a ‘*’ on the map below.
Along with heavy downpours, the storms this week may also contain hail and strong winds. Below is the severe weather outlook from the Storm Prediction Center for Tuesday. This has our entire viewing area in the slight risk for severe weather.
I do think there will be a threat for torandoes in the Midwest on Tuesday, but I want to see how the set-up looks on Monday before discussing this chance further.
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Have a great day and check out 12 News for the updates!