As the week unfolds, residents of Cleveland and surrounding areas are looking at a period of calm weather, under the firm grip of Canadian high pressure through Friday night. According to an Area Forecast Discussion by the National Weather Service in Cleveland, a weak low-pressure system is expected to follow on Saturday, but for the immediate future, skies will remain mostly clear and dry.
Today's forecast suggests that any minuscule instability will be limited to the formation of a cumulus field, barely managing to squeeze out a few sprinkles. The winds, meanwhile, are set to ease up tonight, which should allow temperatures to drop as dewpoints fall into the 30s. There's a question of frost tonight, especially for NW PA and the first tier of counties in NE OH, where the winds might be just tame enough to allow for a Frost Advisory—which, by the way, has been issued for the early hours of Thursday. On the lakeshore, however, chances of frost are considered too low to warrant concern.
Temperatures over the next couple of days will hover between the upper 50s and mid-60s, which might feel like a brisk reprieve to some. But Thursday night, the forecast warns of a more pronounced drop, marking the season's coldest bout so far. "This will be the coldest night of this Fall season so far, and do not expect winds or clouds to be any sort of inhibiting factor, unlike the tonight period," reads a segment from the NWS discussion. Frost and even freezes are likely inland, away from the insulating effect of the lake.
This cooling trend is setting the stage for an isolated return of showers on Saturday as a closed upper low moves into the Southern Great Lakes, dragging with itself an accompanying surface low. As for the long-term outlook, the potential entanglement between a coastal low off the Carolina coast and the aforementioned system needs to be monitored. Otherwise, temperatures are expected to take on a gradual warming trajectory into early next week.
Aviation-wise, VFR conditions are set to dominate through Sunday with continuously improving conditions post the exit of Tuesday's cold front. Lake-enhanced clouds remain a consideration but are unlikely to dip below VFR thresholds. Winds are currently northerly and, although breezy, will progressively weaken over the next period according to the NWS aviation outlook.
Over Lake Erie, boaters should brace for a bit more action with Small Craft Advisories in effect due to waving conditions reaching 4-6 feet in certain areas. These advisories, according to the NWS marine discussion, are set to expire by late Wednesday into Thursday, as winds ease off and high pressure settles in, promising calmer waters ahead.
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