National Weather Service Raw Text Product

192 
FXUS61 KCLE 152330
AFDCLE

Area Forecast Discussion
National Weather Service Cleveland OH
730 PM EDT Wed May 15 2024

.SYNOPSIS...
Low pressure over the Ohio Valley departs east to the Mid- 
Atlantic Coast tonight. High pressure builds into the area
tonight through Thursday evening. Another low pressure system 
will impact the area on Friday and Saturday.

&&

.NEAR TERM /THROUGH THURSDAY NIGHT/...
Upper-level low and surface low combination centered over
southern OH/western WV will continue to make eastward progress
this evening. Scattered rain showers with embedded isolated
thunderstorms east of I-75 and away from Lake Erie will 
continue through about 00Z this evening before rapidly 
dissipating thereafter. Patch to areas of fog will develop late
tonight through tomorrow morning before giving way to partly
sunny skies tomorrow as weak high pressure builds in. The next
low pressure system approaches from the west tomorrow with rain
chances increasing late Thursday night (30-50% range west of 
I-77).

&&

.SHORT TERM /FRIDAY THROUGH SATURDAY NIGHT/...
An upper-level trough with just a weak surface reflection is 
expected to be located over the southern Plains and Ozarks Friday 
morning. This upper trough is expected to lift east-northeast 
through the first half of the weekend while gradually closing off. 
Models are trying to key on a couple of pieces of energy working 
through Friday morning and again Friday evening/night ahead of the 
main closed low, with the main closed low making its closest pass on 
Saturday before getting shunned towards the central Appalachians 
Saturday night. Broad warm / moist advection and occasional lift 
ahead of the approaching closed low will keep the forecast unsettled 
for Friday and Saturday. The forcing with a closed off/cut off and 
relatively weak low aloft will be diffuse and fairly modest so it 
will not rain the entire period, with greater shower and storm 
potential likely to be tied to the exact timing / track of the 
various pieces of upper energy and daytime heating. POPs start out 
fairly similar area-wide Friday morning. From late Friday through 
Saturday night, higher POPs are generally focused farther south and 
east with lower POPs gradually working in from the northwest. It is 
uncertain how quickly we can clear the rain out of parts of our area 
during the day Saturday, as the closed low will not be in a hurry to 
move through and exit. However, there is currently better agreement 
that a more notable drying trend is likely by Saturday night. 

It will be slightly above average and on the muggy side for this 
period. Expect highs generally in the 70s Friday and Saturday with 
dew points pushing towards or into the lower 60s. Overnight lows 
will be in the low to mid 60s Friday night, perhaps cooling slightly 
more into the upper 50s/lower 60s for Saturday night. There is not 
expected to be enough instability or flow aloft for a severe weather 
threat Friday or Saturday. A lack of greater organization should 
preclude much of a flooding threat, though with weak mean flow any 
convective showers or storms could drop isolated heavier rain.

&&

.LONG TERM /SUNDAY THROUGH WEDNESDAY/...
As the closed low from the first half of the weekend exits east, 
broad ridging and deep-layer southwest flow will develop. This will 
allow for a more substantial warming trend into the first half of 
next week. A warm front is expected to develop just to our north on 
Monday ahead of low pressure ejecting out of the Plains and towards 
the upper Midwest. This means we should be in the open warm sector 
until a cold front crosses in the vicinity of Tuesday night or 
Wednesday. Mainly dry conditions are expected Sunday and much of 
Monday. We will need to monitor for thunderstorms to develop to our 
west and make it in at times late Monday through Tuesday afternoon. 
Greater shower and storm potential may arrive Tuesday night as the 
cold front begins nearing, so have rather low POPs Monday and 
Tuesday trending to high chance or likely (40-60%) Tuesday night and 
Wednesday. By Tuesday and Wednesday, the combination of steeper mid-
level lapse rates potentially advecting in aloft and above-average 
PWATs could yield sufficient instability, when combined with 
moderate flow aloft, for more organized thunderstorms. Highs will 
range from the mid 70s to low 80s for Sunday, warming more solidly 
into the low to perhaps mid 80s for Monday and Tuesday. Highs on 
Wednesday will be very dependent on frontal timing. Overnight lows 
will generally range from the mid 50s to the mid 60s.

&&

.AVIATION /00Z Thursday THROUGH Monday/...
With the afternoon convection slowly winding down, do not think
that will have much of an impact going forward in the forecast
for the region. Biggest challenge overnight is the onset of fog
and/or stratus, both IFR or possibly worse. The fog is probably
a bigger threat where rain has fallen today, but in the end,
this part of the forecast is a bit lower confidence. Formation
of both IFR stratus/fog would be later in the overnight, after
09Z. Likely will take until after 14Z to reach VFR conditions
once again where restrictions do form. SCT cumulus field during
daytime heating Thursday.  

Outlook...Non-VFR possible with showers and thunderstorms 
Thursday night through Saturday.

&&

.MARINE...
North-northeast flow at 8 to 15 knots will continue through Thursday 
morning. High pressure will slide over the lake on Thursday, causing 
the winds to become variable but generally onshore with the highest 
pressure located over the chilly lake waters. Winds shift east-
southeast Thursday night and Friday at generally 6 to 12 knots with 
southeast winds continuing through Friday night. Winds will be 
variable but generally light over the weekend. Winds and waves are 
expected to remain below headline criteria for the foreseeable 
future. Some fog is possible over the chillier waters of the eastern 
basin overnight tonight into early Thursday. Isolated thunderstorms 
are possible over the lake Friday afternoon through Saturday 
evening, though greatest potential should be inland.

&&

.CLE WATCHES/WARNINGS/ADVISORIES...
OH...None.
PA...None.
NY...None.
MARINE...None.

&&

$$

SYNOPSIS...Saunders
NEAR TERM...Saunders
SHORT TERM...Sullivan
LONG TERM...Sullivan
AVIATION...26
MARINE...Sullivan