Area Forecast Discussion
Issued by NWS Louisville, KY
FXUS63 KLMK 021927
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
327 PM EDT Sat May 2 2015
.SHORT TERM (Now through Sunday Night)...
Issued at 310 PM EDT Sat May 2 2015
Nice warmup to continue as high pressure over the region will shift
east of it overnight and settle over the Carolina coast by Sunday
night. Southerly winds will bring that warmer air, with highs
getting to around 80 in our warm spots and lows generally in the
50s. The only concern for tonight would be chance for fog. With the
high to our east, we will see a little more moisture in the region.
We did see a few patches of fog this morning and with a little more
moisture we could see better coverage by daybreak Sunday. Have put
in patchy to areas of fog for this reason.
.LONG TERM (Monday through Saturday)...
Issued at 325 PM EDT Sat May 2 2015
The long term period continues to look generally quiet throughout
the period. The long term global guidance continues to be in good
agreement with a deep western US trough developing with ridging
developing just east of the Mid-MS valley. The deterministic runs
along with quite a few of the ensembles continue to show the
development of a tropical system off the US SE coast by midweek.
Should this occur, it appears that a Rex block will be in place
across the eastern US which would generally lock the upper level
pattern in place. In this particular case, much of the Ohio Valley
would remain in a broad southwesterly flow pattern throughout the
The previous forecast had this well in hand and only some minor
adjustments were needed. In terms of sensible weather, a stalled
out frontal boundary will likely remain to the north of the region
early in the week and eventually wash out as stronger ridging
develops in response to the deepening western US trough and the
possible tropical development off the SE US coast. This will lead
to a continued warming and moistening of the column throughout the
week. By Thu/Fri the pattern may start to break down slightly with
the ridge axis drifting to our east. Increasing afternoon
instability may lead to diurnally driven convection mainly in the
afternoon/evening hours. However, still will keep PoPs in the
isolated range closer to climatology. By the weekend, the pattern
should break down even more allowing the western trough to come
eastward bringing our next chance of precipitation the region.
As for temperatures, we expect to see above normal temperatures for
the period. Afternoon highs in the lower to middle 80s are likely
with overnight lows cooling into the upper 50s to the lower 60s.
.AVIATION (18Z TAF Update)...
Updated at 135 PM EDT Sat May 2 2015
VFR conditions with fairly light winds most of the period. Winds
will become more southerly by late Sunday morning, as high pressure
over us now heads east.