Severe thunderstorms and flooding rains are possible in parts of southern Minnesota and western Wisconsin this Tuesday evening, and the flooding rain threat will continue overnight.
The Storm Prediction Center of the National Weather Service continues a tornado watch until 10 p.m. Tuesday evening:
A tornado watch has been issued for parts of Iowa, Minnesota and Wisconsin until 10 PM CDT pic.twitter.com/uMcpU3cpOr
— NWS Twin Cities (@NWSTwinCities) September 4, 2018
The tornado watch does not include the seven-county Twin Cities metro area, but it does include Rice and Goodhue counties just to the south of the metro area, plus Pierce county of west-central WI.
Details of the tornado watch:
URGENT – IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 368
NWS Storm Prediction Center Norman OK
335 PM CDT Tue Sep 4 2018
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Northern and central Iowa
Western and central Wisconsin
* Effective this Tuesday afternoon and evening from 335 PM until
1000 PM CDT.
* Primary threats include…
A couple tornadoes possible
Isolated damaging wind gusts to 70 mph possible
SUMMARY…A gradual strengthening of low-level winds in conjunction
with a very moist air mass will support the possibility of
high-precipitation supercells as well as organized small-scale
bowing segments. A couple of tornadoes will be possible aside from
wind damage through the mid-evening hours.
The tornado watch area is approximately along and 60 statute miles
north and south of a line from 30 miles west southwest of Fort Dodge
IA to 60 miles north northeast of Camp Douglas WI. For a complete
depiction of the watch see the associated watch outline update
(WOUS64 KWNS WOU8).
REMEMBER…A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
AVIATION…Tornadoes and a few severe thunderstorms with hail
surface and aloft to 1.5 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 500. Mean
storm motion vector 22030.
Flooding rains expected
Heavy rains are expected Tuesday evening into the overnight hours Tuesday night in much of south-central and southeastern Minnesota and parts of western Wisconsin:
The Twin Cities metro area could see rainfall totals of two to three inches, but we could see close to four inches in parts of Dakota county.
Higher rain totals are expected from southeastern Minnesota into parts of western and central Wisconsin.
The areas with the highest areas of rain are most likely to see flash flooding:
A flash flood watch continues into the overnight hours for the areas with the best chance of flash flooding:
According to the NWS:
On average, more people are killed by flooding than by any other single severe weather hazard, including tornadoes, lightning, and hurricanes. Most of these deaths occur at night, when it is more difficult to recognize flood dangers, and when people are trapped in vehicles.