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 Post subject: What a wind gust!
PostPosted: Thu Jun 12, 2014 3:44 pm 
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I was checking my local forecasts here in S Florida and came across a strange wind gust this AM. Other nearby stations also got the gust so it happened. To think, I keep dreaming of an 18m Chrono or 21m FS - if I had been out on one of those in one of these though...

Interestingly, the American GFS model had originally predicted today with 30 mph winds and gusts up to 40 mph (last week's forecast for today, since watered down to 3 mph forecast). For an hour or so it was correct! The wind lasted from 7-8:30 am or so.


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 4:04 pm 
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180deg. direction change followed by a massive gust. We used to have them a few times a season in NSW south coast in summer. If the wind dropped quickly for no apparent reason we would all rush to the beach and deflate the kites. Then 50kn would hit you like a brick wall for 5 minutes. I don't know what you call this phenomenon but you have to be aware of your local spot special situations.


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 4:18 pm 
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Location: Vancouver
That spike doesn't represent a single gust. It's a single data point that represents an entire hour, from 6:00 to 7:00. There may have been hundreds of gusts during that hour, and they may have increased gradually over as long as a full hour. You simply can't tell from those once-an-hour graph plots.


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 4:31 pm 
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Location: jackson WY
In Wyoming we call them "poltergusts"!
We have to continually look up wind to look for these headed our way. I laugh when people at the beach say the wind is gusty.


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 4:54 pm 
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Well here is the Continuous Time data courtesy of NOAA. A gust can last more than 5 minutes although micro gusts that are sub-10 minutes are definitely the norm down here. Elsehwere, Ive had gust that lasted an hour without stopping.

Time is in UTC mode, wind speed is in m/s.


Date ____hh mm DIR WSPD GDR GST GTIME
2014 06 12 14 00 347 1.0 320 7.2 1309
2014 06 12 13 50 003 0.0 999 99.0 9999
2014 06 12 13 40 358 0.5 999 99.0 9999
2014 06 12 13 30 342 2.6 999 99.0 9999
2014 06 12 13 20 328 5.1 999 99.0 9999
2014 06 12 13 10 315 4.6 999 99.0 9999
2014 06 12 13 00 318 2.1 320 12.4 1207
2014 06 12 12 50 325 4.6 999 99.0 9999
2014 06 12 12 40 326 6.7 999 99.0 9999
2014 06 12 12 30 325 8.2 999 99.0 9999
2014 06 12 12 20 323 10.3 999 99.0 9999
2014 06 12 12 10 320 9.8 999 99.0 9999
2014 06 12 12 00 321 9.8 320 19.6 1104
2014 06 12 11 50 322 11.8 999 99.0 9999
2014 06 12 11 40 325 12.9 999 99.0 9999
2014 06 12 11 30 321 12.4 999 99.0 9999
2014 06 12 11 20 324 14.9 999 99.0 9999
2014 06 12 11 10 323 16.5 999 99.0 9999
2014 06 12 11 00 322 14.4 320 17.5 1059
2014 06 12 10 50 334 10.8 999 99.0 9999
2014 06 12 10 40 349 8.8 999 99.0 9999
2014 06 12 10 30 349 8.2 999 99.0 9999
2014 06 12 10 20 352 7.2 999 99.0 9999

2014 06 12 10 10 339 4.1 999 99.0 9999
2014 06 12 10 00 330 3.1 300 5.7 0926

A poltergust is not a bad name for it lol. The wind is dead out there but for an hour and a half this AM...that wind came from somewhere else man.


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 5:21 pm 
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would be interesting to see a picture of the sky at his time...if dark front ok, you can see it.
but if clear blue sky and and hits, it is scary...


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 5:32 pm 
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In Singapore, squall lines are common just before and around dawn at this time of year. They are called Sumatra Squall Lines, because of where they are coming from.

This tree fell this morning, because of one of these squall lines. This particular one reached 50 knots but they can be as strong as 70 knots. I wouldn't want to be out on a kite - the wind can go from less less than 10 knots to superstrong in seconds.

Image


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 7:37 pm 
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I don't think you would have been caught with your big kite, you had a good warning at 15:00, then 180 deg wind shift, the sky must have shown storm cells, look all around you when you kite they are always behind you. if the wind goes up, switches direction and dies, always land and see what is brewing... It is generally very wet or very nasty.


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 8:21 pm 
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Interesting idea guys. I do not know as much about weather patterns as I feel I should. The wind did indeed change 180 degrees and its as described, a serious lull followed by a massive spike. So the lesson here is that if I ever get a 180 degree wind direction change followed by a total lull, I should land and park until I see what is coming? I can live with that, tis certainly a strange phenomena. Out in the Keys, its certainly useful since they are islands. Hard to tell if kitesurfing off the main coast as it would simply feel like a lull given the huge wind shadow the Miami area always has.

I was not out on the water in the AM so no idea what it looked like visually, was just looking at forecasts and hoping/praying the Monday/Tuesday forecast for the FL Keys holds up - that wind has been getting pushed back day after day and I am starving for some wind. Couldn't help but notice such a strange weather pattern, would scare me quite abit out on open water.


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 Post subject: Re: What a wind gust!
PostPosted: Thu Jun 12, 2014 10:37 pm 
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We just had our wind spike up...avg 35.7mph...gust 43.7mph
You could see the wide darker cloud coming very very slowly
Plenty of time to take cover
The wind felt really cool ....temperature dropped 10 degrees F
There was no thunder or lightning as it approached
The wind blew strong and dry for over 5 minutes as it passed over then rain and thunder started

http://www.ikitesurf.com/windandwhere.i ... siteID=541

:surf:


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