Archive for September, 2009

Wind Shear Explanation
September 30, 2009

If you’ve read our recent posts on the severe weather for Thursday, you’ve probably noticed the term “wind shear”.   Wind shear is the changing of wind direction with height.

Here’s a diagram of a typical wind shear situation.  Winds at the surface are out of the south, while winds aloft are flowing out of the west-southwest.   Of course [...]

Severe Weather Update for Thursday
September 30, 2009

 Not a lot of changes in the severe weather threat for Thursday.  The computer models have been consistent moving a cold front into our area from 3 until 9 p.m.  The cold front will be fast moving; by 10 p.m. the rain and storms should be out of our area.
The atmosphere ahead of the front is [...]

STRONG MOISTURE SURGE THURSDAY…
September 30, 2009

Our winds will be ramping up out of the south and southwest by Thursday morning and that will lead to a big increase in moisture.  The best way to see the movement of moisture is to examine the dewpoint temperatures.  The definition of dewpoint temperature is the temperature the air has to cool in order to reach saturation [...]

Severe Weather Thursday
September 29, 2009

We’ve enjoyed a rather tranquil weather pattern over the last several weeks; however, that trend is about to change as a strong upper level storm system heads our way for Thursday!
The forecast models are in agreement that strong to severe thunderstorms will develop across our area by late Thursday afternoon and evening.  Here’s the set-up:

A strong [...]

Why The Colors Change?
September 28, 2009

I love this time of the year.  The cooler air from the north signals the possibility of a beautiful fall color change across the Ozarks and Ouachitas, but what exactly causes the change?  Our friends at www.arkansas.com have a great explanation I have included below. 

Frost rarely triggers fall foliage. The first heavy frost seldom occurs [...]

LATE WEEK STORMS…
September 28, 2009

Another cold front will be arriving later this week and unfortunately this cold front will have enough moisture to produce some showers and storms.  Some of these storms could be severe with hail and damaging winds.  The Storm Prediction Center is already keeping a close eye on the set up for Thursday.
THURSDAY

THURSDAY SURFACE MAP

We are [...]

Big Changes Tonight….
September 27, 2009

This afternoon temperatures warmed well into the 80’s and 90’s thanks to a southerly wind and a mostly sunny sky.  Average highs for late September are in the upper 70’s and lower 80’s.  Fall will quickly return for Monday as a cold front arrives from the northwest.  

The cold front will usher in cooler air aloft [...]

The Coolest Air Of The Season Arrives Tuesday Morning
September 26, 2009

Highs will reach the mid 80s to low 90s Sunday afternoon. It may be the last good opportunity to hit the lake or pool considering there will be plenty of sunshine as well. A cold front will slice temperatures 10 to 15 degrees by Monday afternoon. The bulk of the cold air will arrive on Tuesday [...]

1 Day Of Summer On The Way
September 25, 2009

The sunshine has returned and now the temperatures are about to increase. Below is the 850 mb temperatures for Sunday evening.

Temperatures are expected to top out in the mid 80s in northwest Arkansas and near 90 in the river valley. The summer like temperatures will only last one day before fall returns. A cold front [...]

DENSE FOG ADVISORY…
September 25, 2009

A large portion of the area is under a DENSE FOG ADVISORY this morning.  Be prepared to take it slow this morning and maybe leave a few minutes early to your morning denstination.  The advisory will last until 9am and then the sunshine we are expecting for Friday will help to move the fog out of the area.
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