|Mesoscale Discussion 1213|
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Mesoscale Discussion 1213
NWS Storm Prediction Center Norman OK
0310 PM CDT Sat Jul 01 2017
Areas affected...Portions of
Concerning...Severe Thunderstorm Watch 388...389...
Valid 012010Z - 012215Z
The severe weather threat for Severe Thunderstorm Watch 388, 389
SUMMARY...The threat for severe weather continues across remaining
valid portions of Severe Thunderstorm Watch number 388 and 389. A
local watch extension across a small portion of southwest Maine may
be needed in the near term.
DISCUSSION...Within Severe Thunderstorm Watch 388, severe
thunderstorms were in progress from the Mohawk Valley region of New
York east/northeast across central Vermont/New Hampshire as of
2000Z. This area is located along a differential heating boundary
from earlier widespread rain and thunderstorms, and the
near-storm/downstream environment remains characterized by generally
weak surface-based buoyancy and 35-40 kts of deep-layer shear.
Latest objective analysis and area VWP data also depict effective
SRH values at or above 200 m/s2 across northern portions of the
watch area. This environment will continue to support a severe wind
risk, and the more discrete storms will be capable of low-level
rotation and some tornado potential. Given latest radar trends, a
local watch extension may be needed into portions of the WFO GYX
County Warning Area over southwest Maine.
Within Severe Thunderstorm Watch 389, a mostly linear storm mode had
been noted, although a cluster of strong storms has recently
developed west of Allentown PA. Several reports of wind damage and
near severe gusts have been received within the watch area. With
moderate surface-based buoyancy and 35-40 kts of deep-layer shear, a
continued damaging wind threat will accompany the line of storms as
it moves into eastern portions of the watch area during the
remainder of this afternoon and into early evening.
...Please see www.spc.noaa.gov for graphic product...
LAT...LON 39627572 39157543 38487651 38617771 39327750 40397705
41327662 41657641 42487600 43087538 43577425 43907322
44117224 44117120 44027065 43687078 42207178 41737280
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