Weather News with J7409 Tuesday 8/28/18

484 views · Published 28 August 2018 · 4:54 · Indexed 6 November 2026

Channel: J7409 · 2018 · Science & Technology

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Weather News with J7409 for Tuesday 8/28/18.
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A corridor of strong to severe thunderstorms is expected to develop from northern Missouri to lower Michigan. Wind and hail are the primary risks. A cold front is currently stretching from Canada, across the Upper Great
Lakes region, and southeastward into the Central Great Basin. Several
areas of low pressure are embedded within the structure, enhancing the
instability and lift in these locations. Strong southerly flow is pulling
warm and moist air inland from the Gulf of Mexico towards the frontal
boundary, while colder Canadian air continues to fill in behind. The clash
of these two air masses is leading to showers and thunderstorms along and
just ahead of the frontal boundary, enhanced by any embedded low pressure
circulations. The Storm Prediction Center has issued a slight risk for
severe thunderstorms stretching from the Middle Mississippi Valley
northeast into the Upper Great Lakes today. The Weather Prediction Center
has also issued a slight risk for excessive rainfall for the same region,
as well as a moderate risk of excessive rainfall for southern Wisconsin
and far northern Illinois, where a Flash Flood Watch as well as multiple
advisories and warnings are ongoing. The risk of severe storms and
excessive rainfall will slowly shift eastward with the movement of the
cold front in the coming days.

Meanwhile, for locations south and east of the cold front, the strong pull
of warm and humid air is leading to suppressing heat. This heat is
expected to persist through the coming days, with a strong upper level
ridge in place, making it hard for the cold front to make much eastward
progression. Many locations could see high temperatures in the mid and
upper 90s today with heat indexes in the triple digits. Heat Advisories
are in effect for portions of the Mid Mississippi Valley, including all of
Central Illinois, lower Michigan, as well as across much of the Northeast
and northern Mid-Atlantic. An Excessive Heat Warning is also in place
today across the St. Louis metropolitan area.

Elsewhere, a much colder Canadian airmass is shifting southward and across
the Northwestern U.S.. The combination of cooler air and light winds is
suppressing the ongoing fire concerns, and helping to alleviating the
excessive smoke in the air. Only one Air Quality Alert remains in place
for today across Southern Oregon, where an ongoing wildfire continues to
burn. Meanwhile, heavy, wet snow was impacting the northern Rockies
overnight, but should clear out throughout the morning.


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