Forecast Blogs

Tiny Hail Chance Tonight + Details on Severe Weather Thursday

(Editor’s Note: This post was written by Bobby, the Intern Applicant who took a shot at Peyton Manning on his first go-around).

Current Official Hourly Observation (taken at :53 on the hour)

Temps Next 24 Hours (auto-updating)

Current Radar Loop

It’s Severe Weather Awareness Week across the State of Tennessee. The NWS picked the right week — there’s a chance of severe weather Thursday.

Today’s topic is Lightning:

Tonight – Chance of Thunderstorms

National Weather Service Text Product Display 2014-02-18 16-28-39 2014-02-18 16-29-58

Later tonight expect scattered, hit or miss thunderstorms. These carry a 5% chance of small hail happening between 0 and 25 miles of you. See the below hail probability from the Storm Prediction Center:

Expect this activity to begin around 10 PM. Send any hail reports to the NWS by tweeting it with the hashtag #tSpotter.

Wednesday – Mostly Sunny, Chance of Rain Late – Morning Low 52 / Afternoon High 64

National Weather Service Text Product Display 2014-02-18 16-30-12 2014-02-18 16-31-39

It’s going to be a spring-like day thanks to the arrival of warm, moist air from the Gulf. There’s a chance of rain again late Wednesday night, but nothing severe.

Thursday – PM Strong/Severe Thunderstorms Expected  Morning Low 52 / Afternoon High 74

National Weather Service Text Product Display 2014-02-18 16-32-12 2014-02-18 16-33-22

The SPC (Storm Prediction Center) has us under a slight risk of severe weather Thursday. Don’t focus on the term “slight.” Think of it as “elevated.”

Storm Prediction Center Feb 18, 2014 0830 UTC Day 3 Severe Thunderstorm Outlook 2014-02-18 16-34-44 2014-02-18 16-37-56

Before the storms arrive, winds will be strong: sustained winds at 20-25 mph, with gusts up to 45 mph. A Wind Advisory will probably be needed.

Here’s an overview of the system from GFS model, covering Thursday 6 AM – Friday 6 AM:


The storms will race into Tennessee from the west and be on us by the early evening (rush hour). We are expecting the storm line to arrive sometime between 6 PM and 9 PM.

The timing isn’t certain. The NAM (predictably) sends it in quickly, around 3 PM:

However, the GFS (below) and the Euro (not shown) agree on the after-rush hour ETA. I think this is legit.

How will this impact us?

This will be a fast moving band of severe thunderstorms (squall line) moving in east in a straight line. It will pack strong winds, potentially up to 58+ mph (which would make them “severe”). This is the main threat.

Rain totals will be as much as 1″ and 1.5″; however, there is no flooding concern.

There is also a low-end risk of tornadoes embedded in the line of storms. Tornadoes can form on the leading edge, or embedded inside, the storm line. In the event of a Tornado Warning, shelter in the lowest level of a sturdy structure (NOT a car or mobile home) with as many walls between you and the outside — not saying you’ll need to shelter, but be prepared just in case.

Official extended NWS Forecast:

Screen Shot 2014-02-18 at 4.27.46 PM

“I can see clearly now, the rain is gone”… Great weekend ahead!

Additional information can be found on Twitter @NashSevereWx.

Categories: Forecast Blogs