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Post by mosue56 on Jul 26, 2022 7:15:23 GMT -6
Why does this seem to always happen at night?
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Post by John G -west belleville on Jul 26, 2022 7:17:19 GMT -6
West Belleville Report 0749
6.96 inches of rain.
573 lightning strikes detected.
These are some of the most intense weather events. It's incredible how much has to come together to make something like this happen.
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twocat
Junior Forecaster
North St. Peters off Cave Springs
Posts: 395 
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Post by twocat on Jul 26, 2022 7:20:16 GMT -6
9.8" according to the Davis on the roof in North St. Pete. It was very loud last night!
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Post by John G -west belleville on Jul 26, 2022 7:24:50 GMT -6
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Post by jmg378s on Jul 26, 2022 7:26:32 GMT -6
Why does this seem to always happen at night? The low level jet, at about 1500m altitude, strengthens at night when the surface cools and the drag associated with near surface convection/thermals subsides. This jet can carry copious amounts of moisture and lift that just keep feeding into a low level boundary. This is why heavy rain often happens at night. |
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Post by bdgwx on Jul 26, 2022 7:27:00 GMT -6
The airport has 8.43" in 8 hours.
The 6-hr threshold for a 1-in-1000 year event is 7.80"
The 12-hr threshold for a 1-in-1000 year event is 9.50".
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Post by Snowstorm920 on Jul 26, 2022 7:28:46 GMT -6
Sitting at just under an inch in Arnold this morning.
Going from a drought straight into historic flooding is a very St. Louis thing.
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Post by jmg378s on Jul 26, 2022 7:30:17 GMT -6
I've thought for a long time now that those recurrence intervals from the Hydrological Design Studies Center need to be reevaluated. We've had two 1-200 year and now a 1-1000 year events all within the last 5 years.
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Post by jmg378s on Jul 26, 2022 7:33:51 GMT -6
I suspect my gauge tipped at around 6" last night (it is not a sturdy mount), when I picked it up it still had 4.5" in it. So all I know is that I had greater than 4.5" by about 6am. I'm in eastern St. Pete.
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Post by guyatacomputer - NE St. Peters on Jul 26, 2022 7:35:45 GMT -6
Wife can't get to work. Too many low lying intersections and bridges over creeks. She's hoping the water drops in a couple of hours.
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Post by Snowman99 on Jul 26, 2022 7:40:36 GMT -6
Finally started raining here. Lmao
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modracer
Weather Intern
MASCOUTAH, Illinois
Posts: 835
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Post by modracer on Jul 26, 2022 7:42:29 GMT -6
4.46" According to the Davis, in Mascoutah
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Post by tedrick65 on Jul 26, 2022 7:47:25 GMT -6
I've thought for a long time now that those recurrence intervals from the Hydrological Design Studies Center need to be reevaluated. We've had two 1-200 year and now a 1-1000 year events all within the last 5 years. FEMA is trying to get away from that terminology altogether as that is never what it really meant. 1-200 is being called an event that has a 0.5% chance of happening in any 12-month period, which is a better representation of the statistical analysis behind it. |
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Post by WEAXWATCHER on Jul 26, 2022 7:50:28 GMT -6
4.46" According to the Davis, in Mascoutah We are at 6.02". Strange how a mile, at most, makes that much of a difference.  |
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Post by dschreib on Jul 26, 2022 7:52:13 GMT -6
Wife can't get to work. Too many low lying intersections and bridges over creeks. She's hoping the water drops in a couple of hours. Took me 2:40 to get to work. Normally a little over an hour. Finally got diverted off WB70 and had to come in the back way. |
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Post by dschreib on Jul 26, 2022 7:53:26 GMT -6
4.46" According to the Davis, in Mascoutah We are at 6.02". Strange how a mile, at most, makes that much of a difference. We’re a little over an inch down Rte 4 another 20mi. |
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Post by BRTNWXMAN on Jul 26, 2022 7:56:31 GMT -6
This is the most impressive rainfall event we've seen since 2015...unreal training! Have yet to check the gauge but I'm guessing it's at least 3-4".
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Post by bdgwx on Jul 26, 2022 8:01:54 GMT -6
8.81" at the airport as of 9am.
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Post by cardsnweather on Jul 26, 2022 8:10:49 GMT -6
8.81" at the airport as of 9am. Outside chance they hit 12 for the daily. |
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Post by yypc on Jul 26, 2022 8:18:24 GMT -6
The strip north of Wright City, south of Troy looks like it got hit the hardest with 11-12” so far
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Post by Frivolousz21 on Jul 26, 2022 8:21:16 GMT -6
I'm told at home since I left 3 hours ago just over 2.65".
So that's 8.75" roughly total.
Will never see this again in my lifetime in Belleville.
Thank God 🙏 most of Belleville is not susceptible to flash floods
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Post by Snowman99 on Jul 26, 2022 8:25:25 GMT -6
The old daily record of 6.85 in STL was aug 20 1915 from The Galveston hurricane. Pulverized that record
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Post by Snowstorm920 on Jul 26, 2022 8:31:42 GMT -6
NAM is showing another round of rainfall tonight with some sky-high PWATs well over 2"  |
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Post by yypc on Jul 26, 2022 8:34:11 GMT -6
The rain still goes all the way back to near the missouri-kansas border 😱
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Post by Snowstorm920 on Jul 26, 2022 8:38:30 GMT -6
The NBM is highlighting the area just south of where the worst rainfall occurred this morning for rainfall tonight. There is some overlap there, especially on the IL side. Don't take the amounts it's showing literally, it's more for placement purposes.  |
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dgflyer13
Weather Weenie
St. Charles, MO (Near 364 & 94)
Posts: 13
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Post by dgflyer13 on Jul 26, 2022 8:41:33 GMT -6
Can anyone explain why the KSTL daily precipitation via the link below doesn't reflect the 1915 daily record of 6.85"? www.weather.gov/lsx/monthTab |
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Post by bdgwx on Jul 26, 2022 8:46:17 GMT -6
As of 9:40 STL has had 10.85" for July. I believe this is the 2nd wettest July on record behind 1948 of 12.65".
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Post by bdgwx on Jul 26, 2022 8:52:21 GMT -6
Can anyone explain why the KSTL daily precipitation via the link below doesn't reflect the 1915 daily record of 6.85"? www.weather.gov/lsx/monthTabIt's there. Switch to August 2021 and you should see it listed on the 20th. |
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modracer
Weather Intern
MASCOUTAH, Illinois
Posts: 835
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Post by modracer on Jul 26, 2022 8:59:59 GMT -6
I would say yours is correct, I don't trust my Davis, I need to get that new one ordered. I have never seen our dock this full before. 4.46" According to the Davis, in Mascoutah We are at 6.02". Strange how a mile, at most, makes that much of a difference. |
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Post by John G -west belleville on Jul 26, 2022 9:23:50 GMT -6
There has been a dam failure in Nashville, IL affecting the secondary city reservoir.
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