Area Forecast Discussion
Issued by NWS Louisville, KY
FXUS63 KLMK 241040
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE LOUISVILLE KY
640 AM EDT Tue Mar 24 2015
...Updated Aviation Discussion...
.SHORT TERM (Now through Wednesday)...
Issued at 312 AM EDT Tue Mar 24 2015
Early morning satellite imagery reveals mostly clear conditions over
southern KY this morning with partly to mostly cloudy skies over
southern Indiana and northern Kentucky. A stalled out frontal
boundary lies across the region this morning. North of the
boundary, temperatures are in the upper 30s while areas south of the
front are still in the lower to middle 40s. For the remainder of
the overnight hours, not much change in the ambient conditions are
expected. Overnight low temperatures will occur toward sunrise with
lower to mid 30s in the north with upper 30s to the lower 40s in the
Later this morning, mid-level wave over the Plains will continue to
work northeastward into the Midwest and NW Ohio Valley. A gradual
moistening of the atmosphere will occur and shower activity will
increase generally to our west and northwest. Some of these showers
may impact our southern Indiana and portions of our northern KY
counties late this morning through the afternoon hours. Rainfall
amounts would be very light. A more complicated forecast is
afternoon temperatures. With the frontal boundary draped out across
the region, a gradient of temperatures are expected once again.
Highs will range from the lower to middle 50s in the north with
upper 60s to the lower 70s across southern Kentucky.
The aforementioned frontal boundary will lift northward tonight.
This will allow milder air to filter in from the south to the
north. With the front moving north of the region, much of tonight
will be dry with partly to mostly cloudy conditions. Overnight lows
will only cool into the lower-middle 50s.
The frontal boundary is likely to shift a bit more south toward dawn
Wednesday which may bring some light rain showers to the region.
Overall coverage looks to be scattered at best. The boundary will
lift northward again during the afternoon and rain chances will
decrease a bit as we get back into the warm sector. Temperatures
are still tricky here. Much of the guidance suggests temperatures
topping out in the very low 70s. However, if we were to break out
of the clouds, a run at the mid-upper 70s would be likely.
.LONG TERM (Wednesday Night through Monday)...
Issued at 300 AM EDT Mon Mar 23 2015
The long term will begin with active weather, followed by a quieter
but much cooler end to the week. We will then see warming
temperatures with a chance for precipitation for the beginning of
For Wednesday night an upper level trough will approach
from the Plains. An associated surface low will track northeast
along the Ohio River overnight Wednesday into Thursday. The low will
drag a cold front through on Thursday. Showers along and ahead of
this front will move into the region late Thursday evening and
continue to move through overnight and into the morning hours. A
40-50 knot low level jet will develop overnight and some strong
storms with this system will not be out of the question. However,
instability will be limited given the timing of the system. Thus,
severe potential will be limited, but some storms could have gusty
winds with them or possibly small hail. Rain will move off to the
east Thursday with just a few showers lingering into Thursday
evening across the east. As the upper level trough deepens across
the eastern CONUS Friday another weak wave will drop through it
bringing a chance for some light, cold showers Friday.
Temperatures will fall quickly in the wake of the front on Thursday.
Highs may very well be at the beginning of the day with temps
falling or holding steady into the afternoon. Friday and Saturday
will be much colder than normal for this time of year with highs in
the 40s and lows dropping into the mid to upper 20s. High pressure
will keep the weather dry Saturday and Saturday night.
Another wave and cold front will move through Sunday into Monday.
The timing of this system is still somewhat in question. It could
bring a chance for more showers sometime through this time frame.
Temperatures will be Sunday into Monday with highs Monday back in
the upper 50s to around 60.
.AVIATION (12Z TAF Update)...
Issued at 640 AM EDT Tue Mar 24 2015
Generally, VFR conditions are expected across the region today. A
cold front has stalled out across the southern parts of the region.
North of the front, the surface winds are out of the NE while
light/variable winds are found south of the front. Some mid-high
level ceilings are occurring north with ceilings running above FL100.
For today, the stalled out front is not expected to move too much.
We expect plenty of mid-high level cloudiness to move in from the
east and affect KSDF and KLEX. Ceilings still look to remain above
VFR thresholds. Some scattered showers will be possible...mainly
north of the river. However, will be keeping some VCSH in at
KSDF/KLEX this afternoon. Down at KBWG, VFR conditions are expected
throughout the day. Surface winds will be out of the NE at KSDF and
KLEX today with speeds of 6-8kts. Light and variable winds seen at
KBWG. The stalled out front will lift northward tonight and allow
southerly winds back into all the terminals. VFR conditions look
likely into the overnight hours.