The current weather pattern noted by winds off the lake, has brought a dry and cool, but comfortable air mass to the region over the past couple days. It’s a pattern that has contributed to a month that so far is running cooler than normal. Changes in the weather pattern, however, is on the way.
The surface low pressure area associated with an upper level trough responsible for the current weather pattern here in the Chicago region will move eastward fully positioning itself over New England and the Northeast region by Thursday. In its wake to replace will be a broad and moderately strong 500 mb ridge (associated with a surface high) currently extending from the Plains northward into the southern provinces and prairies of Canada.
As this broad high pressure area moves east Thursday and Friday, it will weaken slightly. This will translate in high temperatures here in Chicago in the 80s (which is above normal but could potentially have been much warmer).
On Saturday and Sunday, the ridge or area of high pressure re-develops and/or intensifies over the Great Lakes region. This will translate in temperatures in the lower to mid 90s with peak readings coming on Sunday.
With a jet stream to our north, air tends to sink and compress resulting in heating at the surface. This combined with lack of cloud cover and a dry soil will make it easy for temperatures to reach these expected levels in the coming days.
Early next week and then again possibly late next week showers and thunderstorms will saturate area soils and provide farmers with much needed rainfall.
Further down the road, forecast confidence remains rather high on warmer than normal temperatures in the 8-14 day outlook based off of a consistent consensus amongst model runs.
Thursday: Mostly sunny and pleasant. Highs in the lower 80s. Cooler near the lake. Winds northeast 5-15 mph.
Friday: Partly cloudy and warmer. Highs in the mid to upper 80s. Winds southwest 10-20 mph.
Saturday: Partly cloudy, very warm, and humid. Chance for an evening thunderstorm. Highs in the lower 90s. Winds southwest 10-20 mph.
Sunday: Partly cloudy, very warm, and humid. Clouds build from west to east late. Highs in the lower to mid 90s. Winds southwest 10-20 mph.
Monday: Partly cloudy, very warm, and humid with the scattered showers and thunderstorms. Coverage increases at night. Highs in the upper 80s . Winds southwest 10-20 mph.
Tuesday: Partly cloudy and unseasonably warm with a chance for showers and thunderstorms. Highs in the lower 80s. Winds southwest 10-20 mph becoming northwest late.
Wednesday: Partly cloudy, cooler, and less humid. Highs near 70. Winds northwest 10-20 mph.
8-15 day outlook (Long-range Forecast)
Thursday June 14: Highs in the 70s.
Friday June 15: Highs in the 70s.
Saturday June 16: Highs in the 70s.
Sunday June 17: Highs in the 80s.
Monday June 18: Highs in the 90s.
Tuesday June 19: Highs in the 90s.
Wednesday June 20: Highs in the 80s/90s.
Thursday June 21: Highs in the 80s/90s.
Friday June 22: Highs in the 80s.
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