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Public Information Statement

Statement as of 10:14 PM CDT on July 22, 2014

... NWS damage survey for 07/21/14 tornado event in Grand
Forks County ND...

This intermittent tornado formed along the leading edge of
a larger scale Bow-echo squall line. This tornado was likely
wrapped in heavy rain and more widespread damaing downburst
winds along much of its path. One or more additional brief
tornadoes may have formed along adjacent storm segments.

.Tornado 1...

Rating: EF-1
estimated peak wind: 90 mph
path length /statute/: 8 miles
path width /maximum/: 300 yards
fatalities: 0
injuries: 0

Start date: Jul 21 2014
start time: around 829 PM CDT
start location: approx. 2 miles E Kempton ND
start lat/lon: 47.8200n/-97.5700w (est.)

End date: Jul 21 2014
end time: around 841 PM CDT
end location: approx. 2 miles SSE Arvilla ND
end_lat/lon: 47.8900n/-97.4800w (est.)

A tornado tracked intermittently for about 8 miles to about
2 SSE of Arvilla by 841 PM CDT. This tornado snarled trees
in shelter belts and broke down numerous large tree
branches... limbs and whole tree trunks along its path.
A few rural residences and farm buildings had shingles torn
off... quonset doors were torn off... and at least one small
farm outbuilding was collapsed. Peak winds estimated to 90
mph. Maximum width to 300 yards.

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

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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