YESTERDAY’S FLASH FLOOD
Yesterday’s storms did not move.
“No movement” storms are common in the summer. Mid and upper level winds that move storms have gone north.
So the storm’s entire life — and all its rain — gets one spot.
Less humidity Friday. High only 83°!
Today and tonight, low pressure will be spinning over the Bourbon trail.
Because winds spin counterclockwise around a low, showers developed by the low should rotate into Middle Tennessee, including us (Nashville and Will Co) later this afternoon or tonight.
May 20.
A horrible anniversary.
Six years ago on May 20 an EF5 tornado hit Moore OK, near OKC. Seven kids were killed at Plaza Tower Elementary School. In all, this tornado caused about 25 fatalities, depending on how you count them (“direct vs indirect” casualties). Over 1,000 homes destroyed. Flattened.
Some strong to severe thunderstorms are possible today, with the main threat being damaging winds. Hail and a few brief tornadoes are possible as well, but chances are low. Localized flash flooding will also be possible for areas that receive multiple rounds of heavy rain today.
Rain ETA as early as Wednesday night, but bet on a Thursday rain ETA. Right now outdoor events Wednesday night look safe.
Very little good high res data available between hours 60 and 90, which is how many hours we are from this event. Thankful for Euro model 90 hour data which suggests rain arriving sometime middle of the day Thursday and lasting Thursday night into the overnight hours. But one run of one model is no way to plan life, so expect updates/changes/refinements to this prophesy.
Big storm system churning through Louisiana, Arkansas, and Mississippi today will be here tonight.
Local worry level: low.
Before storms, gusts to 40 MPH possible. Blowing in from the south, crossing perpendicular to east-west highways (I-40, I-840, and I-440*), so be especially careful driving big trucks. Don’t get blown out your lane.