Now that June is in the books and meteorological summer is one-third of the way through, how do the prospects for severe weather look in a typical July weather pattern in the District?
The severe weather season in the Washington area has been unrelenting! Four tornadoes touched down in Maryland on June 10 and then three days later two more were confirmed. Reagan National had 2.77 inches of rain also on June 10th, which surpassed the former 24-hour rainfall record of 2.27 inches. There were NO daily record high temperatures set at either airport (Dulles or Reagan National).
Now that we are transitioning into the second month of meteorological summer, how do our odds stack up for severe weather? July leads the year with the most occurrences of high winds from thunderstorms, with an average of 92 reports across the region. Hail is less frequent in July with an average of 19 reports, compared to May, which leads the year with an average of 25.
Not such a good statistic here…. July averages the most tornadoes in the region, with 6. May, June and September tie for second place with an average of 4 tornadoes for each month.
Breaking down the severe weather coverage by hour, the least likely time for severe weather is 5 a.m.; 6 p.m. is the prime time for severe storms. Looking at the chart below, hail is most likely to occur between 4 p.m. and 5 p.m., damaging winds between 5 p.m. and 6 p.m. (21-22 UTC) and tornadoes in the 4 p.m. and 6 p.m. hours.