ST. LOUIS — UPDATE 4:30 a.m. Tuesday morning:
Thunderstorms formed overnight, but did not perform as expected. Pockets of heavy rain are moving through the area, but most locations will only receive less than 1" of rainfall. In heavier bands, up to 1.50" is possible and therefore the Flood Watch has expired for the entire area.
Multiple storms over the St. Louis area are expected to bring heavy rain and have the potential for flooding in a few isolated areas Monday evening.
This cold front to the north will actually bring us some relief from the heat. The tweet below is a visible satellite loop for Monday morning. Notice how the storms move along this front and this area isn't moving southwest too quickly. That's the reason we've got the potential for flooding in some areas later on Monday. The National Weather Service has posted a flood watch for much of the St. Louis area into late Monday night.
Thunderstorms are developing in the hot and humid air ahead of the cold front this afternoon. The storms will produce rainfall of one to two inches per hour or more. If storms move over the same areas repeatedly, the flood threat will increase, especially in the areas that have seen flooding in the last two weeks.
Another round of storms is expected this evening and after sunset that are moving slowly and over the same location as seen above. This is where the flooding concerns are heightened as more of these storms develop and could move over the same locations repeatedly.
Keep in mind how saturated we are recently, obviously some areas more than others. Depending on where these storms develop along this front, rainfall totals will vary. The potential for 2" to 3" of rain is very possible through Monday, with some isolated 4" totals in some areas by Tuesday morning.
Follow the 5 On Your Side Weather team this evening and overnight for updates on storm development and rainfall totals.
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Things to do to be ready for a storm
- Clear out any litter in and around storm drains near your home
- Check gutters for any debris clogging the gutter
- Check on generators in case of power outages
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