National Weather Service Raw Text Product

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Public Information Statement
National Weather Service Duluth MN
108 PM CDT Mon Jul 20 2020


...NWS DAMAGE SURVEY FOR EARLY MORNING 07/18/2020 TORNADO EVENT...

.OVERVIEW...

Early in the morning hours of Saturday, July 18, 2020 a line of 
storms moved across east-central Minnesota and northwest Wisconsin
producing a number of brief tornadoes. While a line of storms 
moving through overnight is a common occurrence across the 
Northland during the middle of summer, these storms were in an 
environment favoring the development of brief tornadoes due to the
low level wind profile. These tornadoes can spin up extremely 
quickly and are much more difficult to anticipate on radar 
compared to traditional supercell tornadoes. While the tornadoes 
that occurred were all short in path length and brief in nature, 
they produced significant wind damage over a very localized area. 
At this time there are at least two tornadoes that have been 
confirmed, but there may have been two additional tornadoes that 
are still being investigated. The National Weather Services thanks
storm spotters and our partners at the county and tribal level, 
especially those who work in 911 Dispatch and Emergency Management
for their assistance in sharing reports and helping us make 
accurate assessments of the damage. All information below is 
preliminary in nature. (For information about tornadoes that 
occured in central Minnesota and parts of west-central Wisconsin, 
please consult our neighboring office in the Twin 
Cities/Chanhassen, MN.)


.TORNADO #1 - Maple/Blueberry, Wisconsin...

Rating:                 EF-1
Estimated peak wind:    100 mph
Path length /Statute/:  0.4 miles
Path width /Maximum/:   50 yards
Fatalities:             0
Injuries:               0

Start date:             Jul/18/2020
Start time:             1:48 AM CDT
Start location:         2 N Blueberry / Douglas / WI
Start Lat/Lon:          46.6036 / -91.6702

End date:               Jul/18/2020
End time:               1:50 AM CDT
End location:           2 N Blueberry / Douglas / WI 
End_lat/lon:            46.6062 / 91.6623

.OVERVIEW...

Another brief tornado occurred near the community of Sanborn
(within the township of White River) near the intersection of
County Road E and Petrin Rd/Highway 112. Damage was localized to
just a few properties and included a major loss of roof panels of
a garage and total collapse of a metal outbuilding. Additional
imagery may result in longer path length, but overall this tornado
was extremely short in duration and path length, with a rotation
signature appearing on radar for just one scan (scanning the low
level environment every 3 minutes) and was not preceded by a
Tornado Warning. This appears to be the last/final tornado from
this line of storms.

.Tornado #2 - Sanborn, Wisconsin (Town of White River)...

Rating:                 EF-1
Estimated peak wind:    110 mph
Path length /Statute/:  0.6 miles
Path width /Maximum/:   50 yards
Fatalities:             0
Injuries:               0

Start date:             Jul/18/2020
Start time:             2:51 AM CDT
Start location:         1 NNW Sanborn / Ashland / WI
Start Lat/Lon:          46.4429 / -90.9128

End date:               Jul/18/2020
End time:               2:53 AM CDT
End location:           1 N Sanborn / Ashland / WI
End_lat/lon:            46.4499 / -90.9054



EF Scale: The Enhanced Fujita Scale Classifies
Tornadoes into the following categories.

EF0...Weak......65 to 85 mph
EF1...Weak......86 to 110 mph
EF2...Strong....111 to 135 mph
EF3...Strong....136 to 165 mph
EF4...Violent...166 To 200 mph
EF5...Violent...>200 mph

NOTE:
The information in this statement is PRELIMINARY and subject to
change pending final review of the events and publication in
NWS Storm Data. 

$$