883 FXUS61 KCLE 131047 AFDCLEArea Forecast Discussion National Weather Service Cleveland OH 647 AM EDT Sat Sep 13 2025
.SYNOPSIS... An upper level trough will swing through the eastern Great Lakes today. Surface high pressure over Canada will gradually build southeast through the middle of the week.
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.NEAR TERM /THROUGH SUNDAY/... Shortwave energy will traverse the ridge across the Upper Midwest today bringing an increase in mid and high level cloud to the area. The airmass remains generally dry below 600mb as seen on 00Z DTX raob with just a shallow layer of moisture near 750mb. Precipitation can be seen upstream moving across Lake Michigan and will tend to follow the instability gradient to the south towards the Illinois/Indiana state line. The local area can primarily expect thickening of the cloud field but can not rule out a few sprinkles across northern portions of the forecast area this afternoon. High temperatures will be very close to yesterdays values in the upper 70s to low 80s. Some moisture advection near 850mb does sneak into Northwest Ohio this evening and will continue with a low 20 percent chances of showers tonight. Low level convergence is focused west of the area and it is most likely to see dry conditions prevail, but worth maintaining a mention of an isolated shower.
Surface high pressure will strengthen over Ontario and Quebec in the wake of the upper trough crossing New England. Surface winds will set-up out of the east northeast, enhancing the lake breeze. Flow off the lake will keep temperatures a couple degrees cooler while inland areas trend up a couple degrees into the low to mid 80s with mostly sunny skies.
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.SHORT TERM /SUNDAY NIGHT THROUGH TUESDAY NIGHT/... An omega block pattern will be in place through the short term with an upper level ridge extending north across the Central Great Lakes into Canada. Heights climb aloft with inland temperatures creeping up while surface winds out of the northeast off Lake Erie will have a moderating effect on temperatures. Diurnal temperature swings of 25-30 degrees will continue with a persistent dry airmass.
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.LONG TERM /WEDNESDAY THROUGH FRIDAY/... Above normal temperatures will continue into the long term and are expected to peak on Thursday as winds develop out of the southwest. While models disagree on the strength, they all show the upper level ridge starting to break down Thursday night into Friday as a trough approaches from the Plains. This should bring some return moisture to end the week and a chance of precipitation. Clouds and a chance of showers will have a dampening effect on temperatures by Friday.
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.AVIATION /12Z Saturday THROUGH Wednesday/... Primarily VFR conditions are expected to continue through the TAF period. There is some patchy fog this morning with localized IFR or lower vsby, though this is not impacting any TAF sites. Fog should dissipate by 13z. A cluster of thunderstorms over WI as of 11z is moving southeast. These storms won`t reach the area, though extensive mid-level clouds blowing off from this convection (bases generally 6-10,000 feet) will spread in from the northwest later this morning into this afternoon. Virga will likely accompany these mid-level clouds. Rain has been reaching the ground upstream over MI from these clouds, and recent HRRR/RAP runs are in agreement with the hi-res NAM in bringing in some very light rain to Northwest OH. Given this, added a 3-hour window of VCSH at TOL and FDY early-mid afternoon. Am not expecting any thunderstorms or vsby restrictions. Farther east have the mid-level clouds included, though with no concern for precip. Skies trend towards clear this evening. Patchy fog will likely develop again late tonight into early Sunday. Future cycles will re-evaluate if this needs included in any TAFs.
Winds will remain
NWS CLE Office Area Forecast Discussion