Statement as of 3:18 PM CDT on June 27, 2017
Expires 4:30 AM EDT on June 28, 2017
318 PM CDT Tue Jun 27 2017
... Updated NWS damage survey statement for June 22nd, 2017 tornado
debris signature in western Shelby County. The assessment for the
Fairfield tornado is complete and unchanged...
NWS meteorologists surveyed a storm track in western Shelby County,
where Doppler radar showed a tornado debris signature. Damage found
was consistent with a tornado. Details are outlined below.
Bands of showers and a few thunderstorms, rotating around the
remnants of Tropical Storm Cindy, produced flooding rainfall and
tornadic activity. One storm produced a tornado of EF-1 intensity in
western Jefferson County. A second storm produced a very brief EF-0
tornado in western Shelby County.
.Tornado #1 Fairfield tornado (jefferson county)...
estimated peak wind:110 mph
path length:8.29 miles
path width:255 yards
Start date:june 22 2017
start time:12:21 PM CDT
start location:4 NNE Bessemer
End date:june 22 2017
end time:12:38 PM CDT
end location:4 W Birmingham
Survey summary: National service meteorologists surveyed storm damage
in western Jefferson County, and found that the damage was
consistent with a tornado. There were three separate notable
increases in damage severity and/or density, likely indicating that
the tornadoe's funnel had a skipping/cycling characteristic as it
swayed from less to more intense.
The tornado touched down along 5th street north, between Highway 11
and Avenue a, where damage ranged from broken large limbs to uprooted
and snapped trees. The tornado then traveled northeast with a long
swath of damage centered along a track generally between Interstate
20/59 and Highway 11. Aside from continued uprooting of trees and
Downing of limbs, the first notable damage occurred just west of
Western Hills mall, where there was hefty damage to an express oil
change, Alabama abc store, and mini strip mall, along Dr. M.L.K.
Boulevard. Damage at this location was likely the result of a short-lived,
concentrated vortex, with a track around 300 yards in length and EF-1
intensity. Beyond this point, damage fell into EF-0.
The tornado continued knocking down trees as it moved northeast,
with some trees falling onto homes, resulting in severe roof damage.
Tornadic winds also caused minor to moderate roof damage ranging
from missing shingles to sections of roof damaged or blown off,
especially in neighborhoods adjacent to miles College (to the south
and northeast). Given a noticeable increase in damage density, it's
possible that the tornado briefly intensified in this area, over the
course of roughly a 700 yard path. While there was an obvious
increase in the amount of uprooted trees, there was a large
contribution from shallow root systems and especially saturated soil
from several-day's rain; thus, given a lack of notable wind-driven
damage to homes (which held in EF-0, characteristic of shingle and
roof trim damage), the overall damage pattern didn't tip the scale
for a small corridor of EF-1 rating.
Next, the tornado neared and crossed Interstate 20/59 where the extent
of damage backed off, though some minor structural damage done to
the tire tech car Bay, and freeway Honda. Windows were also blown out
of a few cars at Honda dealership. An increase in the number of
uprooted trees was again observed surrounding Tuxedo Park on the
north side of Interstate 20/59, along with roof damage to a few
homes. Tornado damage became very sporadic and increasingly less
significant as the tornado neared Bankhead Highway, dissipating near
the csx transportation railways adjacent to Pratt Highway.
Also, here's some information regarding damage to the kfc, express
oil change, abc store, and adjacent mini strip mall, and the decision
to downgrade from EF-2 to ef-1: damage to the kfc included broken
windows and one Point of exterior wall damage, possibly the result of
debris shedding and impact from an adjacent building. The extent of
damage to the kfc is in line with EF-0 caliber damage. The express
oil change had an uplift and shifting of the entire roof, which then
resulted in the failure of several walls. Three large car Bay doors,
and three additional Bay doors in an adjoining work area, likely
served as the Entry Point for tornadic winds to lift the roof and
result in further damage to the structure. The extent and manner of
damage to the express oil change suggests EF-1 caliber damage. The
abc store had complete structure failure, aside from a few interior
walls, due to the type of building framing, as well as the method of
wall-to-foundation fastening. Despite the dramatic appearance of
near-complete destruction, all things considered point toward EF-1
caliber damage. EF-1 level damage was also evident extending
northward to the mini strip mall and the first few units of the
Fairfield housing complex. A careful re-assessment of damage
indicators (affected buildings), degree of damage (extent of damage
to buildings, plus consideration of construction quality and wind
entry points), and surrounding signals led to a rating for this
tornado at high-end EF-1 intensity.
.Tornado #2 Anita tornado (shelby county)...
estimated peak wind:70 mph
path length:0.27 miles
path width:50 yards
Start date:june 22 2017
start time:2:42 PM CDT
start location:3 NE Marvel
End date:june 22 2017
end time:2:43 PM CDT
end location:3 NE Marvel
National Weather Service meteorologists found damage consistent with
a tornado in western Shelby County along a gravel Road extending
north off of County Road 10. The tornado was short-lived and produced
a very brief path of uprooted and snapped trees. An on-duty mine guard
sitting immediately adjacent to the damage path witnessed a sudden
increase in winds, near-zero visibility, and popping of his ears.