From ‘Monthly Weather Review’, August 1959 p. Here is a copy of the trace:Īlthough invisible in this reproduction, there is apparently a faint line on the original trace which is when the excessive rainfall occurred. The minute that ostensibly measured the 1.23” total occurred around 3:22-3:23 p.m. with 2.84” of this falling in a 50-minute period between 2:50-3:40 p.m. It had good exposure and measured a storm total of 3.60” between 2:50 p.m and 11:30 p.m. A recording rain gauge: A Friez Universal Type with a 12-inch capacity, dual traverse pen, and 24-hour clock gear on a chart drum was used to make the measurement. Weather Bureau conducted several exhaustive studies of the Unionville, Maryland claim to 1.23” in one minute on Jand determined it to be accurate (see for the Monthly Weather Review summary). It is hard to imagine how an accurate measurement of precipitation over a 60-second period can be made. Table reproduced from my book 'Extreme Weather: A Guide and Record Book'. records for short-term rainfalls?īelow is a table of the most intense rainfalls on record over various periods of time: How do these stack up compared to the all-time U.S. NOTE: The 5.64" 24-hour rainfall on May 31st in Oklahoma City brought the May total to 14.52", a monthly record and just short of the all-time wettest month (any month) on record of 14.66" set in June 1989.
Some of these included very intense short-term precipitation totals such as the 2.00” in 35 minutes in Oklahoma City on May 31st and 0.69” in 3 minutes (5:26 p.m.-5:29 p.m.) at Houston’s Hobby Airport on April 27th and 0.71" in 13 minutes at Paducah, Kentucky the morning of Saturday, June 1st (4:53 am.-5:06 am.). This spring has seen some phenomenal heavy rain events (as outlined in my previous blog). Wiley Post Airport in Oklahoma City picked up 3.10" in 1 hour and 2.00" in 35 minutes during the tornado and flood event on May 31st. Louis early Tuesday morning.What is the Most Rain to Ever Fall in One Minute or One Hour?Īs a follow up to my last blog I thought I would write up a short summary of the most intense short-term rainfalls on record in the United States.
#48 HR RAINFALL TOTALS MAP MISSOURI UPDATE#
Louis provided an update Tuesday afternoon regarding the historic rain and deadly flooding that pummeled St. Update, July 26, 2:20 p.m.: The City of St. Louis region will have access to necessary resources and services.”Īlso in the release, State Emergency Management Agency Director Jim Remillard urged anyone impacted by the flooding-outside of an emergency-to call 2-1-1 to reach the United Way. “Enacting the Missouri State Emergency Operations Plan enables us to work more efficiently and effectively with local partners and ensures affected communities in the St. “State agencies are prepared and ready to provide assistance to Missourians in flood-impacted areas,” Kehoe said in a release. We urge Missourians to follow the direction of local authorities and emergency managers, never drive in floodwaters, and always use common sense to prevent injury." "Our state government team will work to assist affected Missourians and provide ongoing relief and support during this emergency. Louis region and the potential for additional rain and isolated thunderstorms, we want to ensure that our communities have every resource available to respond and protect Missourians," Parson said in a release. Kehoe was acting on behalf of Governor Mike Parson, who is out of the country on a trip promoting Missouri trade. Update, July 26, 4 p.m.: Missouri Lieutenant Governor Mike Kehoe declared a state of emergency in response to the heavy rain and flooding in the St.
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