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ACUS11 KWNS 132109
SWOMCD
SPC MCD 132109=20
MAZ000-RIZ000-132315-
Mesoscale Discussion 1947
NWS Storm Prediction Center Norman OK
0309 PM CST Sat Nov 13 2021
Areas affected...Parts of eastern Massachusetts
Concerning...Severe potential...Watch possible=20
Valid 132109Z - 132315Z
Probability of Watch Issuance...40 percent
SUMMARY...A line of thunderstorms may be maintained, and overspread
much of eastern Massachusetts during the 5-7 PM EST time frame.=20
This may be accompanied by a risk for localized, potentially
damaging, wind gusts. It is not yet clear that another severe
weather watch will be needed, but trends will continue to be
monitored, and it is possible that Severe Thunderstorm Watch 549
could be locally extended in area across parts of this region
DISCUSSION...As the deepening surface low tracks across
southern/southeastern New England into early evening,
clockwise-curved low-level hodographs appear likely to continue to
enlarge within its warm sector. However, latest Rapid Refresh
forecast soundings indicate that southeasterly near surface flow off
the Atlantic will maintain relatively low surface dew points in the
lower/mid 40s F across much of eastern Massachusetts. They do
indicate that a weak to modest elevated moisture return may
contribute to sufficient CAPE to maintain the approaching line of thunderstorms, which continues to be supported by strong mid-level
forcing for ascent. But it is not clear that there will be more
than a risk for localized strong surface gusts, aided by areas of
enhanced downward momentum transport.
..Kerr/Hart.. 11/13/2021
...Please see
https://urldefense.com/v3/__http://www.spc.noaa.gov__;!!DZ3fj= g!o_G-82KvAit1uJbBNVfYbdqNjda7RnrsREz3voHB7cxbXgIGRpuf8ZuQi1Pvt8V4q5JQpmdA$=
for graphic product...
ATTN...WFO...BOX...
LAT...LON 42137151 42477119 42197067 41946987 41167041 41627143
41547124 42137151=20
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