FINALLY! The last day of this oppressive heat wave... Saturday we got to a peak heat index of 107 degrees, the fourth day straight with heat indices over 100 degrees in Sioux City.
Tonight, we'll have the last of the muggies as both dew points and temperatures stay in the 70's. Storms are also possible mainly north and east of Sioux City as our front pushes east. I think most will stay dry as the largest threat for storms is north of our viewing area.
Tonight our winds shift to the north, bringing in much cooler and drier air for tomorrow. You should be able to feel the refreshing difference as soon as you walk out the door! Dew points will drop from the oppressive 70's to sticky, but not terrible 60's. Definitely an upgrade from these last four days!
Lots of sunshine is expected on Sunday with highs in the mid to upper 80's. Similar weather to start our week with mostly sunny skies and highs in the upper 80's on Monday.
Tuesday we start with the storm chances. The trough, or bulge in the jet stream, that brings in our cooler temperatures flattens out, acting as a highway for upper level energy... allowing burbs of instability in our atmosphere to come and go freely through Siouxland. That will keep storm chances in the 7-day forecast through Friday until the jet stream changes shape.
For now, it is hard to say which day is more likely to have more widespread storms, or even severe storms... but overnight Tuesday into Wednesday, and overnight Wednesday into Thursday look like our best chances for now.
Temperatures hover normal throughout the week in the low to mid 80's.
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