Nationwide Fall Weather Update
US Forecast Brings Sunny Fall Weather Alongside Cooler Temperatures and Morning Fog
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Key Points
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In southeast Wisconsin, a weak system may bring a couple of showers near Lake Winnebago overnight Monday, although most of the area is expected to stay dry; a shift to southwest winds should help temperatures rebound toward 70 on Tuesday.
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Pittsburgh-area frost is most likely in counties northeast of the city and near the Laurel Highlands and I-80, and much of the region is expected to start Tuesday in the 30s.
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Oregon forecasters put the chance of visibility falling below a half-mile by sunrise Monday at 60% to 75% in some fog-prone areas, including the central coast, southern Willamette Valley and far eastern Portland metro near the Columbia River.
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In Tulsa, a weakening cold front expected near the middle of the week is forecast to stay mostly north of the area, with rain chances at 10% or lower through most of the forecast period.
A cool, sunny start to the workweek will bring fall-like conditions across much of the US, with temperatures settling into the 50s and 60s in Pittsburgh, Wisconsin and Connecticut. Fox2Detroit reports that Metro Detroit will see highs in the mid-60s to mid-70s, while WSLS noted that foggy Monday mornings are bringing seasonal chill. Tulsa will warm to around 80 degrees, and Oregon reaches the upper 70s, though morning fog may reduce visibility along the Pacific coast.
Cool Temperatures and Frost Risk in the Northeast
Pittsburgh and surrounding areas will experience a brisk, windy start to the week with temperatures dropping into the 30s by Tuesday morning. WPXI reports that a strong northwest breeze will push in chilly October air across the region. Patchy overnight frost is most likely in counties northeast of Pittsburgh and near the Laurel Highlands and I-80 corridor.
Southeast Wisconsin will see a weak system that may bring a couple of showers near Lake Winnebago overnight Monday, though most of the area should stay dry. Temperatures are expected to rebound toward 70 degrees on Tuesday as southwest winds return.
Dense Morning Fog Threatens Oregon Coast and Valley Visibility
Oregon forecasters put the chance of visibility falling below a half-mile by sunrise Monday at 60% to 75% in fog-prone areas. Dense morning fog is expected along the central coast, southern Willamette Valley, and near the Columbia River in the far eastern Portland metro. However, sunshine should follow the morning fog in the Portland area.
Oregon temperatures could climb into the 80s by Thursday before conditions turn noticeably cooler by Saturday. The early week sunshine followed by moisture and wind shifts will create rapidly changing conditions for residents and commuters in the region.
Upper Midwest and Great Lakes Spotty Rain
Michigan's Upper Peninsula may experience gusty winds, spotty showers, and lake-effect rain with highs trending into the 60s. The cool air mass moving into the Great Lakes region will support isolated precipitation, though most surrounding areas should remain dry.
Rain chances toward the weekend are limited and uncertain across most of the US. Some forecasts suggest a stronger weather system could arrive next weekend or early the following week, but confidence in timing remains low at this point.
Tulsa Stays Dry as Cold Front Weakens Nearby
In Tulsa, a weakening cold front expected near the middle of the week is forecast to stay mostly north of the area. Rain chances remain at 10% or lower through most of the forecast period, leaving the region dry and relatively warm compared to northern areas.
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