Severe Storm Outlook Narrative (AC)
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000
ACUS11 KWNS 202327
SWOMCD
SPC MCD 202327
MEZ000-210100-

Mesoscale Discussion 1371
NWS Storm Prediction Center Norman OK
0627 PM CDT Thu Jul 20 2017

Areas affected...Portions of central/eastern Maine

Concerning...Severe potential...Watch unlikely

Valid 202327Z - 210100Z

Probability of Watch Issuance...20 percent

SUMMARY...A relatively short term threat for locally large hail and
damaging wind will exist this evening.

DISCUSSION...An intense thunderstorm has recently developed
northwest of Bangor, with other cells developing across portions of
central Maine. Steep lapse rates and moderate midlevel
flow/effective shear will support some organized storm structures
this evening as an upper trough swings through the region. A couple
of supercells will be possible with a localized threat of large hail
and damaging wind. Given the number of cells developing northwest of
Bangor, some consolidation into a forward-propagating cluster is
possible, with a continued risk of damaging wind and isolated large
hail.

With the onset of nocturnal cooling this evening, the severe threat
is expected to peak between now and 01Z, with a diminishing trend
expected as SBCINH increases later tonight. Given the relatively
limited spatiotemporal extent of the threat, watch issuance is not
currently anticipated.

..Dean/Guyer.. 07/20/2017

...Please see www.spc.noaa.gov for graphic product...

ATTN...WFO...CAR...GYX...

LAT...LON   45066993 45576966 45756921 45836870 45816794 45466759
            44886767 44486874 44526911 44556966 44836982 45066993



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