Area Forecast Discussion
Issued by NWS Louisville, KY
FXUS63 KLMK 251037
Area Forecast Discussion
National Weather Service Louisville KY
637 AM EDT THU AUG 25 2016
...Updated Aviation Discussion...
.SHORT TERM (Now through Friday)...
Issued at 245 AM EDT Thu Aug 25 2016
With strong ridging in place, our area continues to remain dry early
this morning. Ongoing showers/storms continue just to our north
along the periphery of the ridge. With strong ridging expected to
continue throughout the day, think that our region will remain
mostly dry. There`s only a very small chance (20%) for convection
this afternoon/early evening along and north of the Ohio River
closer to the ridge periphery where lesser capping exists and close
to the KY/TN border where some of the short term models have a weak
disturbance progged which may provide just enough forcing to break
the cap for a few afternoon/evening showers/storms.
The next decent shot for showers/storms looks to come Fri morning
mainly along and west of I-65. Short range models indicate that the
upper ridge will shift slightly east allowing a decent upper level
shortwave to bring convection into the region Fri morning/afternoon.
Right now it appears convection will wane as it moves east of I-65
into the ridge. While no severe wx threat appears likely with
storms Fri, a few of them could be on the strong side with gusty
winds and heavy rainfall.
Perhaps the biggest concern for today and Fri will be the heat and
humidity. With the strong ridge in place, expect high temps to
reach the 90-95 degree range both days with today being slightly
warmer than Fri. Max afternoon heat indices will range from 98-102
this afternoon and 95-100 for Fri afternoon. Night time lows won`t
provide much relief with temps only cooling into the lower 70s
.LONG TERM (Friday Night through Wednesday)...
Issued at 315 AM EDT Thu Aug 25 2016
Friday Night - Sunday...
Hot, humid conditions are expected to continue through the weekend
as strong upper ridging remains in place. Expect highs in the upper
80s/lower 90s and lows in the 70s. As the ridge begins to shift
eastward through the weekend, chances for showers/storms will
increase to 20-40% with the best focus for convection during the
afternoon/evening hours around peak heating. While overall wind
fields will remain on the weak side, good instability combined with
any small disturbance in the flow may produce t-storms with gusty
winds and brief heavy rainfall.
Monday - Wednesday...
The ridge will continue to slowly flatten through the middle of next
week. This will result in at least a slight drop in temps into the
upper 80s to around 90 for highs. Low chances for mainly day time
showers/storms will continue in an active SW flow along the
periphery of the ridge.
.AVIATION (12Z TAF Update)...
Issued at 630 AM EDT Thu Aug 25 2016
Light SW winds and VFR conditions to start, but with BWG trying to
go calm and just a 2F temp/dewpoint spread, there is a small window
of opportunity for MVFR vis. Will include a short TEMPO to account
for that. Otherwise, look for diurnal cu and winds picking up to
near 10 kt late this morning. Can`t rule out an afternoon pop-up at
SDF or LEX, but probabilities are too low for inclusion in the TAFs.
Bigger concerns with fog heading into Fri morning with a weaker
gradient. SDF should remain unrestricted, but BWG and LEX have a
good chance of reaching crossover temps as early as 08-09Z. Will go
with prevailing MVFR, and hit BWG a little harder to at least hint
at the possibility of IFR.