70’s on tap for Wednesday, Thursday

First, TUESDAY’S WEATHER HEADLINES

– A second day in a row with 100% possible sun and temperatures in excess of 70 degrees. Frank Wachowski tells us that the first four days of the month, after receiving 87% of their possible sun, makes this the sunniest beginning of October in the 11 years since 2011. (Frank notes that October produced 100% of its possible sun for eight consecutive days, setting a new October record).

– Looks like we have the 70s as Wednesday and Thursday highs, making this the longest string of consecutive 70 days in 11 days. What a nice start to the new month. It’s perfect for our farmers in the middle of the fall harvest.

– In the course of the night some high clouds will appear. That will likely halt the precipitous temperature drop we experienced last night, which took temperatures down to 45 in O’Hare and 47 in Midway – but down to just 34 in Woodstock and Sugar Grove on Tuesday morning.

— BIG CHANGES ARE AHEAD later this week. We are heading for a gusty cold frontal passage during an extended Canadian anticyclone – with a central barometric pressure of 1041 mb (30.74″) as it crosses Lake Winnipeg in south-central Canada on its way south to the US – The Chicago weather scene will take over late Thursday and for much of the coming weekend.

– The first consecutive 50s and first consecutive 30s of the season in the city are out Friday through Saturday nights.

– The first frost of the season threatens inland areas on Friday and Saturday night – which is almost on schedule for those areas. Oct. 10-12 is the mean first frost date in many of these areas — but Oct. 24 is the mean first 32-degree date in Midway, underscoring how much later in the season freezing temperatures have occurred in the city.

— That makes the incoming air mass the coolest of fall 2022 and the coolest eruption to hit Chicago in the 5 months since last May.

– Temperatures will recover early and mid next week – but a healthy cool bounce is coming again later in the next week.

-While spotty showers may occur later this week with the transition to windy, much cooler weather, modeling suggests precipitation numbers will be quite modest, continuing the drier-than-normal trend we’re seeing in Chicago to have. Mark Carroll, my meteorological colleague at WGN, adds that we are only tracking 7 of the last 151 years of recording NO RAIN in the period September 26th to October 4th.

HERE IS THE CHICAGO METRO FORECAST

TONIGHT: It will be partly cloudy, not quite as cool with near-seasonal temperatures. low 51 in town; low to mid-40s inland.

WEDNESDAY: Partly sunny and mild, but more clouds later in the day. High 75 – a reading that is 7 degrees above normal.

WEDNESDAY NIGHT: Much cloudiness, mild for the time of year. Chance of a few splashes or a short shower or two. Low 54

THURSDAY: Cloudy periods. Mild at first – windy and cooler in the afternoon. A few short showers are possible and the possibility of isolated thunder in one or two spots. Any rain affecting 30% of the area by nightfall. High 71 – but will drop into the 50s later in the day as winds shift north. Wind gusts can build to nearly 40 mph at times late Thursday and Thursday evening.

FRIDAY: Windy and noticeably cooler. The coolest daily temperatures of the season so far. Cloudy periods but with some mixed sun. Lake-effect rain showers are possible in northwestern Indiana and near the Illinois Lake Michigan shoreline. high 55

SATURDAY and SUNDAY: Generous sunshine, only scattered clouds, cool. High Saturday 56. Sunday High 53. CHICAGO MARATHON WEATHER STARTS THE RACE SUNDAY: Temperatures in the low to mid 40s and winds SW to WNW 7 to 16 mph.

MONDAY: Lots of sun, airy and milder. High Monday 65th

TUESDAY: It will be partly cloudy, windy and warmer. Slight chance of scattered rain showers in the afternoon. high 68,

WEDNESDAY: Spooky, mild and windy. high 70

https://wgntv.com/weather/tom-skilling/70s-as-highs-on-tap-for-wednesday-thursday/ 70’s on tap for Wednesday, Thursday

Grace Reader

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