Public Information Statement
Issued by NWS Quad Cities, IA IL

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NOUS43 KDVN 220303
PNSDVN
IAZ040>042-051>054-063>068-076>078-087>089-098-099-ILZ001-002-007-
009-015>018-024>026-034-035-MOZ009-010-232045-

PUBLIC INFORMATION STATEMENT NATIONAL WEATHER SERVICE QUAD CITIES IA
IL 1004 PM CDT Sun May 21 2017

...NWS DAMAGE SURVEY FOR 05/17/2017 TORNADO EVENT...

.UPDATE TO INCREASE THE STRENGTH OF THE DONAHUE AREA TORNADO TO
EF1...

.TORNADO #1 Hooppole Illinois...

RATING:                 EF-1 ESTIMATED PEAK WIND:    95 MPH PATH
LENGTH /STATUTE/:  2.06 MILES PATH WIDTH /MAXIMUM/:   50 YARDS
FATALITIES:             0 INJURIES:               0

START DATE:             05/17/2017 START TIME:             844 PM
CDT START LOCATION:         4.8 Miles WNW Hooppole/ Henry County/ Il
START LAT/LON:          41.5468 N / -89.9994 W

END DATE:               05/17/2017 END TIME:               847 PM
CDT END LOCATION:           4.4 Miles NW Hooppole/ Henry County/ Il
END LAT/LON:            41.5688 N / -89.9725 W

SURVEY SUMMARY: An EF-1 tornado caused damage mainly to large
branches with a few uprooted trees and snapped trunks. There was
also damage to one outbuilding with part of its roof removed.

.TORNADO # 2 Sherrard Illinois...

RATING:                 EF-1 ESTIMATED PEAK WIND:    105 MPH PATH
LENGTH /STATUTE/:  8.1 MILES PATH WIDTH /MAXIMUM/:   150 YARDS
FATALITIES:             0 INJURIES:               0

START DATE:             05/17/2017 START TIME:             800 PM
CDT START LOCATION:         5.3 Miles S Sherrard/ Mercer County/ Il
START LAT/LON:          41.2447 N / -90.5062 W

END DATE:               05/17/17 END TIME:               809 PM CDT
END LOCATION:           5.2 Miles E  Sherrard/ Henry County / Il END
LAT/LON:            41.3329 N / -90.4052

SURVEY SUMMARY: A higher end EF-1 tornado caused damage to numerous
outbuildings, a few homes, and trees across Mercer and Henry
Counties. 30 to 40 trees were snapped at the trunks along with 50
trees experiencing limb damage. A couple dozen trees were uprooted
along the path. One house lost a partial roof and another was
impaled by flying debris.

.TORNADO #3 Galva Illinois...

RATING:                 EF-2 ESTIMATED PEAK WIND:    120 MPH PATH
LENGTH /STATUTE/:  1.29 MILES PATH WIDTH /MAXIMUM/:   50 YARDS
FATALITIES:             0 INJURIES:               1

START DATE:             05/17/2017 START TIME:             920 PM
CDT START LOCATION:         2.0 Miles SSW Galva/ Henry County/ Il
START LAT/LON:          41.1533 N/-90.0811 W

END DATE:               May 17, 2017 END TIME:               921 PM
CDT END LOCATION:           0.8 Miles West Galva/ Henry County/ Il
END LAT/LON:            41.168 N / -90.066 W

SURVEY SUMMARY: A broad mesocyclone created widespread wind damage
and a couple of short lived suction vortices that lead to weak EF-2
tornado damage. One vortice snapped two power poles and did
significant damage to the shingles of one house. Another vortice
completely removed the roof of a house and blew out doors. There was
one 1 minor injury at this location.

.TORNADO # 4 Lake Darling State Park Iowa...

RATING:                 EF-1 ESTIMATED PEAK WIND:    110 MPH PATH
LENGTH /STATUTE/:  3.27 MILES PATH WIDTH /MAXIMUM/:   25 YARDS
FATALITIES:             0 INJURIES:               0

START DATE:             05/17/2017 START TIME:             416 PM
CDT START LOCATION:         3.85 Miles W Pleasant Plain/ Jefferson
County/ Ia START LAT/LON:          41.1453 N/ -91.9313 W

END DATE:               05/17/2017 END TIME:               420 PM
CDT END LOCATION:           1.39 Miles W lake Darling State Park/
Washington County/ Ia END LAT/LON:            41.1924 N/ -91.9241

SURVEY SUMMARY: A rapidly moving EF-1 tornado moved almost due north
damaging farm outbuildings and trees.

.TORNADO # 5 Riverside Iowa...

RATING:                 EF-1 ESTIMATED PEAK WIND:    110 MPH PATH
LENGTH /STATUTE/:  5.95 MILES PATH WIDTH /MAXIMUM/:   40 YARDS
FATALITIES:             0 INJURIES:               0

START DATE:             05/17/2017 START TIME:             636 PM
CDT START LOCATION:         7.31 Miles NE Washington/ Washington
County/ Ia START LAT/LON:          41.3838 N/-91.6021 W

END DATE:               05/17/2017 END TIME:               642 PM
CDT END LOCATION:           3.75 Miles SE Riverside/ Washington
County/ Ia END LAT/LON:            41.4455 N/-91.5219 W

SURVEY SUMMARY: An EF-1 tornado spun up and tracked rapidly to the
northeast. The tornado damaged numerous farm outbuildings, power
lines, and trees along the path.

.TORNADO # 6 WSW Illinois City Il...

RATING:                 EF-0 ESTIMATED PEAK WIND:    70 MPH PATH
LENGTH /STATUTE/:  0.71 MILES PATH WIDTH /MAXIMUM/:   25 YARDS
FATALITIES:             0 INJURIES:               0

START DATE:             5/17/2017 START TIME:             504 PM CDT
START LOCATION:         8.5 Miles WSW Illinois City/ Rock Island
County/IL START LAT/LON:          41.3483 N/-91.0521 W

END DATE:               5/17/2017 END TIME:               505 PM CDT
END LOCATION:           8.0 Miles WSW Illinois City/ Rock Island
County/IL END LAT/LON:            41.3571 N/-91.0452 W

SURVEY SUMMARY: A tornado was observed by a storm chaser. Video
evidence shows a brief touchdown of a brief touchdown in a field.
Rotation was consistent with a wall cloud. No damage was observed
and peak wind speed was estimated at 70 MPH.

.TORNADO # 7 Donahue Iowa...

RATING:                 EF-1 ESTIMATED PEAK WIND:    100 MPH PATH
LENGTH /STATUTE/:  2.14 MILES PATH WIDTH /MAXIMUM/:   25 YARDS
FATALITIES:             0 INJURIES:               0

START DATE:             5/17/2017
START TIME:             744 PM CDT
START LOCATION:         3 Miles WNW Donahue/ Scott County/ Ia
START LAT/LON:          41.7003 N/-90.7228 W

END DATE:               5/17/2017
END TIME:               746 PM CDT
END LOCATION:           3.5 Miles NNW Donahue/ Scott County/ Ia
END LAT/LON:            41.7219 N/-90.6933 W

SURVEY SUMMARY: A Squall line tornado caused a path of damage to
trees and minor roof damage. The path continued through a forest
valley where many trees were snapped off 20 feet above the ground
and several uprooted. Roofing damage to a new home was noted at the
beginning of the path.

EF SCALE: THE ENHANCED FUJITA SCALE CLASSIFIES TORNADOES INTO THE
FOLLOWING CATEGORIES BASED ON THE DAMAGE THEY CAUSE.

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.

$$

NICHOLS/DC



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