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Powerful Storm to Impact Eastern Third of U.S. this weekend.

A developing storm system will bring a myriad of significant impacts this weekend. Heavy snow up to 18 inches from the Ohio Valley to the Northeast, and ice up to a quarter of an inch is forecast in places. Heavy rain may cause flash flooding from the Mid-South to the Mid-Atlantic. Severe thunderstorms with damaging winds and isolated tornadoes will be possible in the Deep South. Read More >

Overview

At least four separate tornadoes occurred Friday afternoon over northeast Colorado.
.TORNADO # 1...

Rating:                 EF-1
Estimated peak wind:    90 mph
Path length /Statute/:  1 mile
Path width /Maximum/:   25 yards
Fatalities:             0
Injuries:               1

Start date:             07/27/2018
Start time:             356 pm MDT
Start location:         7 miles south of Byers

End date:               07/27/2018
End time:               358 pm MDT
End location:           7 miles south of Byers

SURVEY SUMMARY: UPS Truck was overturned by tornado
with 1 injury.  Roof taken off home at one residence.

.TORNADO # 2...

Rating:                 EF-1
Estimated peak wind:    90 mph
Path length /Statute/:  0.5 miles
Path width /Maximum/:   50 yards
Fatalities:             0
Injuries:               0

Start date:             7/27/2018
Start time:             400 pm MDT
Start location:         2 miles northeast of Ponderosa Park

End date:               07/27/2018
End time:               401 pm MDT
End location:           2 miles northeast of Ponderosa Park

SURVEY_SUMMARY: Trees were uprooted.

.TORNADO # 3...

Rating:                 EF-1
Estimated peak wind:    90 mph
Path length /Statute/:  2 miles
Path width /Maximum/:   50 yards
Fatalities:             0
Injuries:               0

Start date:             07/27/2018
Start time:             405 pm MDT
Start location:         4 miles east of Deer Trail

End date:               07/27/2018
End time:               408 pm MDT
End location:           6 miles east of Deer Trail


SURVEY_SUMMARY: Windows blown out of a house.  Metal Cattle Feeder
tossed a quarter of a mile.

.TORNADO # 4...

Rating:                 EF-0
Estimated peak wind:    70 mph
Path length /Statute/:  8 miles
Path width /Maximum/:   50 yards
Fatalities:             0
Injuries:               0

Start date:             07/27/2018
Start time:             421 pm MDT
Start location:         11 miles northeast of Byers

End date:               07/27/2018
End time:               433 pm MDT
End location:           9 miles northeast of Deer Trail

SURVEY_SUMMARY: Tracked across open country.

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 event and publication in
NWS Storm Data.
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