The Heat Goes On . . . .with an increase in Thunderstorms!

Thursday, July 20, 2017 –

Good Evening!  It certainly has been a hot afternoon.  Take a look at our climate data for the Tri-Cities Airport.

Here is a look at the GOES 16 satellite imagery a little earlier this afternoon for our area.

The heat wave continues across the region into Friday and Saturday.

It will be oppressive Friday due to the increase in humidity.   Drink plenty of water and check on the elderly.  Leave the dog at home and make sure your pets have plenty of shade and water if left outside.

I want to share two maps with you tonight.  Take a look at this 500 MB chart, (18,000 ft).  You really can see how a strong ridge of high pressure holds control of most of the country.  This is what is creating the heat wave from the Midwest to the east.  I have added some items to better illustrate the strong ridge of high pressure for you.

This 300 MB chart (30,000 ft) also shows the high pressure ridge and jet stream to the north where most of the storms have been.  I have highlighted the jet stream and added an H for high pressure to better show you the upper air flow pattern.

You might want to hit the pool or lake early tomorrow – storms will be possible by the later afternoon and early evening.

Now that I have shown you the upper air weather pattern, this will play a role in our forecast.   Now take a look at the Storm Team Forecast Maps.  We could actually see some thunderstorms Friday afternoon and Evening.

Tonight – Partly cloudy and muggy.

7 AM Friday – There could be a few spotty showers and a stray thunderstorm to the north of the Tri-Cities.

Noon Friday – Partly cloudy and very Hot with temperatures in the 90’s.

Friday 3:30 PM.  Showers and thunderstorms begin to fire up across the area.

Friday – 6 PM – Thunderstorms move into the region from the west.  If these do develop as the forecast model indicates, they could be strong with the possibility for gusty winds and heavy rains.

The main threat for strong storms will stay north tomorrow.

We will see another round of strong to severe thunderstorms across the Great Lakes, the Ohio Valley and the Mid-Atlantic states on Saturday.,

Our rain chances will increase into the weekend.

Saturday – Showers and storms will be possible during the afternoon and early evening hours.

Sunday afternoon – A front will move towards the area increase the chance of showers and thunderstorms.

Here is a look at the Storm Team 7-Day Forecast.  We cool a little thanks to an in crease threat for showers and storms.

Have a great night!

Mark Reynolds

Chief Meteorologist

News Channel 11

Office:  423-434-4540






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