Topper's Blog: Flag Day Storm 1989, Downburst 1989

8:59 PM, Jun 13, 2013   |    comments
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Flag Day Storm

 

Today is Flag Day. I will always remember Flag Day for that monster thunderstorm back in 1989. The skies darkened around 3:30 that afternoon. A downburst in Chevy Chase and northwest DC downed trees and power lines. Some homes in Northwest and Chevy Chase were without power for three weeks. As strong as those winds were that day what caused massive trees to be uprooted was the wet May. We received over seven inches of rain in May of 1989. Officially 7.77" of rain fell at National. Ironically that was only good enough for sixth place all time. May of 2008, now in third place with over ten inches of rain, actually pushed May 1989 down into seventh place.

 

Winds in excess of 80 mph (Hurricane force winds are 74 mph and up) had no trouble uprooting mature trees in Chevy Chase and Northwest. One estimate calculated that nearly ten percent of all mature trees in Northwest were taken down by the downburst. Damage was estimated at over 28 million dollars. We tracked the storm with our live Doppler radar, yes Channel 9 had live Doppler back then, showing the areas and neighborhoods that would be hit the hardest from the winds. Many residents thought the damage was from a tornado. Downburst winds can leave a circular pattern of damage as the winds spread out. Would the Flag Day thunderstorm uprooted as many trees without that wet May ? No, but it still was a severe storm that would have at the very least taken some trees down and many more tree limbs.

 

Our severe weather outbreak on Thursday was more widespread with more storms. One similarity, however is that we had a lot of rain before this storm and that too may have contributed to downed trees. In fact we have had more rain so far in June than April and May combined.