A squall line moved through western portions of
Charleston, WV WFO area of responsibility during the afternoon and early evening hours on Tuesday
June 14 2005. The line of storms prompted 16 severe thunderstorm warnings and one tornado warning.
Fourteen of the sixteen severe thunderstorm warnings verified, while there were no reports of a
tornado in Lawrence County, Ohio. Wind gust upwards of 60 mph were recorded with widespread reports
of trees and power lines down throughout southeastern Ohio, northeastern Kentucky, and portions of
West Virginia along the Ohio River.
A negatively tiled 500mb trough strengthened as it
progressed southeastward through the Great Lakes during the midday hours. An associated cold front
extended from Lower Michigan south through western Tennessee. Thunderstorms developed over southern
Indiana in a moisture rich, highly unstable atmosphere around 12 pm EDT. The visible satellite
picture in figure one displays the initial thunderstorm development over Indiana and western Ohio
that is ahead of a cold front located in central Illinois. Southwesterly surface winds funneled
Figure 1 1815z visible
upper 60s to lower 70s dew points ahead of the line of
thunderstorms. Water vapor imagery at 1745Z figure
two depicts plenty of dry air at mid levels supporting potential for strong downbursts as
momentum transfer within thunderstorms would mix mid level winds to the surface. The RUC40 analyzed
50kts at 400 mb during the 18-21Z time frame, speeds strong enough to cause large tree branches to
MSAS derived surface moisture convergence at 19Z shown
in figure three supported a continued
propagation eastward of thunderstorms into southern Ohio and northeastern Kentucky. Green colors are
areas of moisture convergence, while pockets of blue illustrate places of moisture divergence.
Convective parameters derived from the RUC40 were
moderate as illustrated in figure four lifted
indexes were about -7C and surface based CAPE was slightly under 2,000 J/KG. Mid level lapse rates
(not pictured) approached 7.0C/KM in the 700-500mb layer, while decent shear existed with 0-6km
winds of 30-40kts.
Half degree base reflectivity was predominately used for
warnings. The lighter
Figure 5 0.5 degree base velocity at 2054
color in eastern portions of Carter, Greenup, and Western
Boyd counties are Doppler estimated winds of 55 to 60 knots. A few pixels of blue in Boyd County
represent estimated winds in excess of 60 knots. Numerous trees and power line were reported down
throughout northeastern Kentucky as a result of the strong winds shown in figure 5.
The half degree base reflectivity at 2149Z
Figure 6 0.5 degree base reflectivity at
Figure 6 illustrates low level reflectivity values
approaching 68dbz as the squall line crossed the Ohio River. When the line went through the
Huntington-Tri state airport (KHTS) in northeastern Wayne County a wind gust of 38 mph was reported.
Additional peak wind gust are supplied in Table 1. The apex of the bow traveled farther north into
Cabell County where downtown Huntington reported several large tree branches down. At closer
examination, an inflow notch can be observed on the border of Lawrence and Boyd counties. This is
indicative of strong winds at the surface.
Maximum wind gust and time (EDT)
62 mph at 346pm
38 mph at 550 pm
52 mph at 440 pm
Charleston, WV NWS Office
49 mph shortly after 700 pm
Charleston, WV Yeager Airport
32 mph at 723 pm
When storms passed through the Huntington vicinity at
approximately 21Z, the greatest moisture flux divergence values were centered on west central West
Virginia (figure 7).
Figure 7 surface moisture
flux divergence overlaid with surface observation at or
Southwesterly surface winds continued to supply good
inflow of moderately unstable air along the leading edge in southern West Virginia. Very warm
surface temperatures near 90 degrees mixed out earlier dew points of 70 degrees, however lifted
indices off the RUC40 at 21Z (not pictured) still computed numbers of -6C and surface based capes on
the order of 2000 J/KG. Notice the area of moisture divergence (shaded blue) over central West
Virginia. This pointed to an area unfavorable to maintain strong thunderstorms. Sure enough as the
squall line continue to move east into the central West Virginia as weakening trend was noted.
Only pea size hail was reported in the Charleston, WV
area during the event in large part due to a high freezing level near 15,000FT and a wet bulb zero
of almost 13,000 feet. These values were computed from the 18Z RUC40 sounding over Lawrence County
Ohio (figure 8)
Figure 8 RUC sounding over
LawrenceCountyOhio at 18Z
As the squall line continued to march eastward into
central West Virginia, it got farther away from the surface front that was positioned back in
western Ohio at 22Z. In addition, the 500MB short wave resided in Lower Michigan well behind the
convection. When the storms were east of a line from Parkersburg to Huntington, 0.5 degree base
velocity dropped significantly from 60kts down to 35kts. Yeager Airport in Charleston only reported
wind gusts of 32 mph. There was a brief flare up in western Kanawha County as the anemometer at the
NWS office 10 miles south of the Yeager Airport gusted to 49 mph.
A graphical display of the wind damage reports from the
event is pictured below.
Figure 9 Summary of storm
repots for the 6/14/05
The reports were complied at the Storm Prediction
Center off the local storm reports issued by National Weather Service Offices. As stated earlier,
wind damage was confined mostly to areas along and west of the Ohio River.