Monday, August 15, 2016

Active Pattern Brings Periodic Rainfall

Heavy rain and flash flooding has afflicted Louisiana this weekend dropping over 30 inches of rain in a few places; there have been 20,000 water rescues, and 6 people have tragically died. That low pressure, with abundant moisture from the Gulf with progressively lift north today and will bring heavy rain and possible flash flooding through portions of Illinois and Indiana.

However, the Stateline looks to stay just north and west of the track of the low pressure. A few showers will be possible in southeastern portions of the Stateline later this afternoon, but more likely we will see rain tonight.

As we continue through the rest of the week we have periodic rain and storm chances through Wednesday night because of passing shortwaves (small low pressure systems) aloft along with abundant moisture in the low levels of the atmosphere. Tuesday holds a late day chance for rain but Tuesday evening looks to hold slightly higher probabilities. Wednesday and Wednesday night will also hold periodic showers and storms with a stronger shortwave that will passing close by; along with a low level trough or dip in the jet stream at the surface.

Next up for rain and storm activity will be late Friday into Saturday with the passage of a cold front ahead of yet another trough in the jet stream that will be even deeper which will bring much cooler weather. Temperatures Thursday and Friday will warm up into the upper 80's and then temperatures fall into the mid 70;s over the weekend.


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