.LONG TERM /MONDAY NIGHT THROUGH FRIDAY/...
As of 233 pm Friday: A return to
autumn is still offered for the
better part of next week. The model guidance continues to show
a positively-tilted upper
ridge moving in overhead Tuesday then
flattening briefly on Wednesday, followed by reamplification along
the Eastern Seaboard in response to a large and deep upper
trof
digging over the Plains on Thursday. Dry weather will continue into
the middle of the week with high temps upwards of five degrees
above
normal into Thursday. From Thursday onward, confidence
goes down as model solutions diverge with respect to the timing
of a
sfc cold
front expected to move around the base of the deep
and amplifying upper
trof to our west through Friday. There is
agreement that
moisture will return ahead of the approaching
trof
on Thursday, with precip possibly breaking out in the southerly
upslope areas during the day. The 12Z run of the
GFS blows the
front through quickly Thursday night and early Friday, but the
ECMWF is more slow and deliberate in keeping the boundary over
the region through Friday. Given the slow movement of the upper
trof axis, think the
ECMWF is the more
likely outcome.
For now,
precip prob was limited to the chance range. Too early to say if
this poses a significant severe weather risk, but it is certainly
plausible just based on pattern recognition, even if the models
don`t really respond with any instability ahead of the front.
GSP watching this for severe weather.