Big weather changes again next week 

Posted: 9:52 am Thursday, October 19th, 2017

By Kirk Mellish

A warming trend is upon us, but already the end of that is in sight. Some of the chilliest temperatures of the season to date on the way by next Wednesday and Thursday. But no freeze expected for ATLANTA as of now with lows of 36-45. Spotty light frost might be possible by Friday.

Most of the country has not had a first freeze yet this autumn:

Screen Shot 2017-10-19 at 9.23.15 AM

Some hefty rain totals are possible in the transition Monday into the first part of Tuesday.

We go from upper-level high pressure ridge aloft today to a deep trough late Wednesday as two short-waves… one in the northern jet and one in the southern jet merge into one stronger low pressure system:

UPPER LEVEL JET PATTERN NOW:

Screen Shot 2017-10-19 at 8.40.01 AM

TWO SHORT WAVES (blue) ALOFT IN JET PATTERN LATE MONDAY:Screen Shot 2017-10-19 at 8.26.19 AM

UPPER LEVEL JET STREAM PATTERN LATE WEDNESDAY:

Screen Shot 2017-10-19 at 8.39.15 AM

That dip in the jet stream may even bring some lake effect snow to the upper Midwest and NE next week.

Screen Shot 2017-10-19 at 7.53.03 AM

MONDAY AM SURFACE WEATHER CHART:

Screen Shot 2017-10-20 at 8.00.05 AM

TUESDAY AM SURFACE WEATHER CHART (note secondary reinforcing cold front):

Screen Shot 2017-10-20 at 8.00.29 AM

BOTH COLD FRONTS MOVE THROUGH BY WEDNESDAY AM:

Screen Shot 2017-10-20 at 8.01.02 AM

PRELIMINARY RAINFALL ESTIMATE MONDAY/TUESDAY:

Screen Shot 2017-10-20 at 7.59.24 AM

The cool lingers into the start of November:

Screen Shot 2017-10-19 at 8.22.23 AMKPDK_2017102000_min_max_16

IMG_1903

FOLLOW ME on Twitter @MellishMeterWSB.

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