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Mountain Wave Winds

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Re: Mountain Wave Winds

Post by Math/Met on 2012-03-07, 1:07 am

This is the closest thing I could find to an active weather story in this area. Winds in Camp Creek are gusting to around 60mph tonight.

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Re: Mountain Wave Winds

Post by Math/Met on 2012-09-17, 1:35 pm

I figured it was time for me to bump this thread for the Fall and Winter seasons. It looks like there could be a minor event tonight if everything comes together. Most of the models show a decent 850mb LLJ developing over the mountains tonight. It shouldn’t be a big deal but it might be the start of the Mountain Wave season.


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Re: Mountain Wave Winds

Post by Toot on 2012-09-17, 7:03 pm

Awesome!! I was just thinking of this thread this morning cheers I would love to make a few youtube videos of these wave events up close and personal but it seems like most of them are nocturnal.

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Re: Mountain Wave Winds

Post by Stovepipe on 2012-09-17, 9:37 pm



Great thread, thanks for the heads up M/M.

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Re: Mountain Wave Winds

Post by Math/Met on 2012-09-18, 2:20 am

Toot wrote:Awesome!! I was just thinking of this thread this morning cheers I would love to make a few youtube videos of these wave events up close and personal but it seems like most of them are nocturnal.

That is definitely a problem with the Mountain Wave setups. The strongest events are typically at night and early in the morning. But, there are opportunities to get video of daytime events occasionally.

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Re: Mountain Wave Winds

Post by Math/Met on 2012-09-18, 2:27 am

Well, this setup wasn’t going to be a bid deal to begin with, but the models actually trended weaker with the LLJ over the area as the system approached. So far tonight, the highest wind gust at Camp Creek is only around 45mph. That certainly isn’t very impressive, but at least it is a sample of the upcoming season.

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Re: Mountain Wave Winds

Post by Toot on 2012-09-18, 8:24 pm

Math/Met wrote:
But, there are opportunities to get video of daytime events occasionally.

I'll be watching for that opportunity of a nice event that comes along during the daylight hours this season. That vid you made was pretty awesome and has given me the itch to make another.

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Re: Mountain Wave Winds

Post by Math/Met on 2012-10-17, 10:10 pm

A mid-term test prevented me from making a post about this earlier, so I’ll just copy and paste what MRX had in their afternoon discussion.

MODELS INDICATE A VERY STRONG
850 MB WIND FLOW IN EXCESS OF 60 KT DEVELOPING OVER CENTRAL KY LATE
TONIGHT AFTER MIDNIGHT. WITH A STABLE BOUNDARY LAYER AND A VEERING
WIND PROFILE OVER THE MOUNTAINS...AND A SOUTHERLY WIND FLOW NEARLY
PERPENDICULAR TO THE MOUNTAINS...THINK THAT MOUNTAIN WAVES WILL BE
POSSIBLE ALONG THE FOOTHILLS AFTER MIDNIGHT TONIGHT. THIS SCENARIO
TONIGHT IS NOT NECESSARILY THE MOST OPTIMUM SET-UP FOR MOUNTAIN
WAVES...BUT IT APPEARS THAT ADVISORY LEVEL WINDS (AROUND 25 TO 35
MPH WITH HIGHER GUSTS) WILL BE POSSIBLE IN THE FAVORED AREAS OF THE
FOOTHILLS.

It is already gusting over 50mph in Camp Creek tonight. That should increase some over the next several hours as the LLJ strengthens and moves closer and as the boundary layer becomes more stable. As mentioned by MRX, this isn't an optimum setup but there should still be some decent gusts with this event.

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Re: Mountain Wave Winds

Post by Toot on 2012-10-17, 10:14 pm

Math/Met wrote:

It is already gusting over 50mph in Camp Creek tonight. That should increase some over the next several hours as the LLJ strengthens and moves closer and as the boundary layer becomes more stable. As mentioned by MRX, this isn't an optimum setup but there should still be some decent gusts with this event.

I figured we would see the mountain waves given the setup. Ive noticed these seem to go hand in hand with a majority of fall severe wx setups for TN. It would be an interesting case study to compare the mountain waves with certain setups for severe wx here.

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Re: Mountain Wave Winds

Post by Math/Met on 2012-10-18, 3:32 am

There have been a few wind gusts to around 60mph so far at the Camp Creek Tower. The gusts may get a little stronger over the next few hours.

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Re: Mountain Wave Winds

Post by Math/Met on 2012-11-11, 6:48 pm

It looks like there will be a good chance of mountain waves tonight and tomorrow morning. Models are showing that a 40-50kt southerly LLJ will be moving over the mountains tonight. Even stronger 850mb winds of 60-70kts will be located to the northwest of the region, so this will put East Tennessee in a traditionally favorable location for strong winds. Winds below mountain top level will be from the southeast, which is perpendicular to the mountains. The 700mb winds above the mountains are expected be from the southwest. A southwesterly wind above mountain level is oriented parallel to the mountain range in East Tennessee, so this will help provide the critical level for mountain wave formation.

Model soundings suggest that the boundary layer will be sufficiently stable for mountain wave formation. There are some indications of a temperature inversion just above the mountain levels, which can help to impede vertical movement of winds as they move across the mountains and can contribute to enhanced downsloping wind potential on the leeward side. All of this suggests that conditions are favorable for mountain wave formation across the area. The NWS issued a Wind Advisory for the potential of mountain waves. Of course, some of the favorable locations will likely gust well above the forecasted wind speeds.


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Re: Mountain Wave Winds

Post by Stovepipe on 2012-11-12, 10:39 am

Thanks for the heads up M/M. It's always interesting to get the Mountain Wave report. Wish I was up there to experience it.

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Re: Mountain Wave Winds

Post by Toot on 2012-11-12, 12:49 pm

So m/m was there any high winds with this one?

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Re: Mountain Wave Winds

Post by Math/Met on 2012-11-12, 2:08 pm

The highest wind gust at Camp Creek was about 30m/s or about 67mph. Not bad, but I’m still waiting on that first major wind event of the year.

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Re: Mountain Wave Winds

Post by Toot on 2012-11-12, 7:49 pm

Math/Met wrote:The highest wind gust at Camp Creek was about 30m/s or about 67mph. Not bad, but I’m still waiting on that first major wind event of the year.

Thanks for the info M/M..whenever you see a poissible rare daytime event please let me know because i want to chase it and get some good video footage!

Thanks for keeping us up to date on these wind events buddy!

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Re: Mountain Wave Winds

Post by Toot on 2012-12-17, 7:35 pm

I wonder where Math/Met is? It looks like a strong mountain wave event may be in cards ahead of the Arctic front. Strong low pressure taking a favorable track with a nice anticyclone sitting just off the SE coast. This creates a screaming low level jet (70kts) with veering winds out of the SE pointing back at the southern apps.


Results could be a damaging wind event in the foothills of the smokies. MRX mentions this in their latest AFD too..folks that live in this area should monitor this one closely. Too bad this one looks to be nocturnal or I might try and get some video mad

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Re: Mountain Wave Winds

Post by Math/Met on 2012-12-18, 2:55 am

Toot,

Thanks for posting about this event. I’m definitely paying attention to this system as well. The vertical temperature profile looks good and (as you mentioned) there is a very strong LLJ. The only potential limiting factor that I can find at this point is that the models try to keep the wind directions at certain levels more southwesterly than some mountain wave events. However, wind that encounters the terrain will likely have a more southeasterly direction due to frictional interactions, so the low level winds should still be nearly perpendicular to the mountains. Overall, I think there is definitely potential with this setup.

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Re: Mountain Wave Winds

Post by Math/Met on 2012-12-19, 2:53 am

Just to keep this thread updated, here is a very good forecast discussion from MRX regarding this event. It pretty much sums up what Toot and I posted last night.

A LOW PRESSURE
SYSTEM IS PROGGED TO MOVE NORTHEASTWARD ACROSS THE MID MS RIVER
VALLEY WEDNESDAY NIGHT...WITH ITS TRAILING COLD FRONT MOVING INTO
THE TN RIVER VALLEY. A STRONG SOUTHERLY 850 MB WIND FLOW (IN EXCESS
OF 60 KT) IS PROGGED TO DEVELOP OVER THE TN RIVER VALLEY AHEAD OF
THIS COLD FRONT...WITH MODEL SOUNDINGS INDICATING A DEEP STABLE
LAYER EXTENDING ABOVE THE MOUNTAINS AND A STRONG VEERING WIND
PROFILE THROUGHOUT THE BOUNDARY LAYER. THUS...IT APPEARS THAT
DAMAGING WINDS DUE TO MOUNTAIN WAVES WILL BE A GOOD POSSIBILITY LATE
WEDNESDAY NIGHT INTO THURSDAY MORNING ALONG THE FOOTHILLS OF THE
MOUNTAINS. THE NAM MODEL INDICATES THAT THE LOW-LEVEL WIND FLOW MAY
BE MORE SOUTHWESTERLY (WHICH IS NOT NECESSARILY THE MOST IDEAL WIND
DIRECTION FOR MOUNTAIN WAVE DEVELOPMENT)...THE GFS MODEL INDICATES A
MORE SOUTHERLY WIND FLOW WHICH WOULD BE PERPENDICULAR ENOUGH TO THE
MOUNTAIN RIDGES FOR THE POSSIBILITY OF A STRONG MOUNTAIN WAVE WIND
EVENT. SINCE IT APPEARS THAT THE OTHER CONDITIONS NECESSARY FOR A
STRONG MOUNTAIN WAVE EVENT SHOULD BE IN PLACE...WILL ISSUE A HIGH
WIND WATCH FOR LATE WEDNESDAY NIGHT INTO THURSDAY MORNING ALONG THE
FOOTHILLS OF THE APPALACHIAN MOUNTAINS.

Current High Wind Watch.

...HIGH WIND WATCH IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH
THURSDAY MORNING...

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A HIGH WIND
WATCH...WHICH IS IN EFFECT FROM LATE WEDNESDAY NIGHT THROUGH
THURSDAY MORNING.

* EVENT...STRONG SOUTHERLY WINDS...BETWEEN 30 AND 40 MPH WITH
HIGHER GUSTS IN EXCESS OF 60 MPH...MAY DEVELOP OVER THE HIGHER
ELEVATIONS AHEAD OF AN APPROACHING COLD FRONT. IN ADDITION...
CONDITIONS APPEAR FAVORABLE FOR THE FORMATION OF DAMAGING WINDS
IN THE FOOTHILLS DUE TO MOUNTAIN WAVES.

* TIMING...LATE WEDNESDAY NIGHT INTO THURSDAY MORNING.

* IMPACTS...WINDS OF THESE MAGNITUDES MAY CAUSE PROPERTY DAMAGE
AND POWER OUTAGES. IN ADDITION...HIGH PROFILE VEHICLES SHOULD
EXERCISE CAUTION AROUND THE MOUNTAINS ON THURSDAY MORNING.

After spending some time looking at this setup today, this looks like a significant mountain wave windstorm to me. While part of the low level flow may be slightly southwest based on some model output, the actual wind flow over the mountains will likely be more south/southeast.

10m Winds (notice the southeasterly direction near the mountains).


850mb Winds(notice a more south or even southeasterly direction directly over the mountain/western North Carolina versus a more southwesterly flow just to the west of that area ).




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Re: Mountain Wave Winds

Post by Math/Met on 2012-12-19, 5:16 pm

THE NATIONAL WEATHER SERVICE IN MORRISTOWN HAS ISSUED A HIGH WIND
WARNING...WHICH IS IN EFFECT FROM 4 AM TO 4 PM EST THURSDAY. THE
HIGH WIND WATCH IS NO LONGER IN EFFECT.

* EVENT...STRONG SOUTHERLY WINDS...BETWEEN 30 AND 40 MPH WITH
HIGHER GUSTS IN EXCESS OF 60 MPH...ARE EXPECTED OVER THE HIGHER
ELEVATIONS AHEAD OF AN APPROACHING COLD FRONT. IN ADDITION...
CONDITIONS APPEAR FAVORABLE FOR THE FORMATION OF DAMAGING WINDS
IN THE FOOTHILLS.

* TIMING...LATE TONIGHT INTO THURSDAY.

* IMPACTS...WINDS OF THESE MAGNITUDES MAY CAUSE PROPERTY DAMAGE AND
POWER OUTAGES. IN ADDITION...HIGH PROFILE VEHICLES SHOULD
EXERCISE CAUTION AROUND THE MOUNTAINS ON THURSDAY.


Toot, It looks like a good portion of this mountain wave event will be during daylight hours.

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Re: Mountain Wave Winds

Post by Toot on 2012-12-20, 10:06 pm

Math/Met wrote:
Toot, It looks like a good portion of this mountain wave event will be during daylight hours.

Ive been so busy here lately..going up to my favorite spot to video these winds was on my mind all day while working. Mad Looks like it got pretty rough over at Camp Creek today with at least one person injured!

*** 1 INJ *** TRACTOR TRAILER FLIPPED ON CAMP CREEK ROAD. ONE RESIDENCE EVACUATED DUE TO STRUCTURAL DAMAGE ON SUNNYDALE ROAD. TWO OTHER BUILDINGS DAMAGED. POWER OUTAGED ACROSS THE AREA.
From: 911 CALL CENTER

SEVERAL SHEDS DOWN. SIDING OFF OF A HOUSE.
From: TRAINED SPOTTER


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Re: Mountain Wave Winds

Post by Math/Met on 2012-12-21, 12:31 am

I drove out there, but the road was already blocked due to a power pole being snapped by the wind. So, I couldn’t get to a good spot to check wind speeds or take video. The wind was really intense while I was out there. The other power lines and trees looked like they could come down at any minute, so I didn’t stay long.

It is really unfortunate that the Camp Creek wind tower wasn’t reporting data today. Hopefully it was still collecting data and that data will become available eventually. I’m really curious to see how strong the winds were with this event. Based on my observations, it was likely one of the strongest mountain wave events that we’ve had in awhile.

I saw that Cove Mountain reported a 100mph wind gust today.

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cabins about 1700' below top of Cove Mountain - we know Mountain Wave Winds!

Post by Connie on 2012-12-22, 7:37 pm

I keep an eye on the winds so I can warn my guests. They definitely hit our ridge 1/2 way down Cove Mountain. We're lucky the trees are all gone (fire March 2007) and we buried the power lines after that.

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Re: Mountain Wave Winds

Post by John1122 on 2012-12-23, 8:30 am

From MRX this morning regarding Tuesday.

850 MB WINDS INCREASE TO
ABOUT 55 TO 60 KNOTS TUESDAY NIGHT WITH A MOUNTAIN WAVE LIKE
PATTERN. A WIND ADVISORY WILL LIKELY BE NEEDED.

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Re: Mountain Wave Winds

Post by Math/Met on 2012-12-24, 4:05 am

I am becoming more confident that this could be another significant wind event on Tues night/Wed morning. The GFS and NAM still indicate a strong LLJ over East Tennessee, with the highest velocities located just to the west of the mountain. The 4km NAM output actually has the LLJ over 70kts directly over some of the mountains in East Tennessee. The soundings look favorable for mountain wave development, and the direction of the low level flow in response to the location of the low could also maximize mountain wave potential.

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Re: Mountain Wave Winds

Post by Toot on 2012-12-24, 8:13 pm

Math/Met wrote:I am becoming more confident that this could be another significant wind event on Tues night/Wed morning. The GFS and NAM still indicate a strong LLJ over East Tennessee, with the highest velocities located just to the west of the mountain. The 4km NAM output actually has the LLJ over 70kts directly over some of the mountains in East Tennessee. The soundings look favorable for mountain wave development, and the direction of the low level flow in response to the location of the low could also maximize mountain wave potential.

Im at a Cabin for the week in the Foothills of the Smokies around 2000 ft in the Wears Valley area of Sevier county. Im not sure if this is a favored spot for Mountain waves or not. Guess I will find out tomorrow yikes

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