ST. LOUIS, MO (KPLR) - The heavy rain threat will continue into Monday night with temperatures staying in the 70's. Keep an eye on creeks and streams that could rise fast.
There is an old front that is nearly stationary to the south of St. Louis. It is an old topically charged low pressure system that is lumbering slowly north along the front and will pass near or just south of St. Louis Monday.
All of the available data continues to point to the heaviest rain totals the next 24 hours for areas along and southeast of I-44 in Missouri and centered on I-70 in Illinois. Much like a winter storm, there will be a very sharp drop off on the northwest edge of the rainfall. The geographical distance between swamping rains and almost nothing may be only a few miles. This makes for a tough forecast for the northwest 1/3rd of metro St. Louis because that is where the back edge will set-up.
The heaviest rain is subsiding and the "flash" part of the flash flooding has reached its peak as water levels have either stabilized or started to fall. However, water levels remain high and flooding continues across parts of metro St. Louis and points south and east into southeast MO and southwest IL.
The concern for this afternoon into tonight is that additional energy may try and bubble up from the southwest that could produce more scattered pockets of heavy rain and storms. Not to the same concentration as we saw overnight, but in spots rainfall may be quite heavy.
Rainfall totals so far have been very close to what was expected with a general 3" to 6" over the southeast 2/3rds of metro St. Louis and east/south from there. Eureka reported almost 4" of rain while Chesterfield saw less than 3/4" at the Spirit Airport.
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