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#1
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Is SKEW-T still important to soaring pilots ?
Having used XC skies and now Topmeteo, I wonder what's the need to get the forecasted SKEW -T diagram to points along your task.
Will you as, a pilot, get any better prediction of soaring conditions if you use both ? Dan |
#2
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Is SKEW-T still important to soaring pilots ?
On Monday, February 29, 2016 at 11:22:12 AM UTC-6, wrote:
Having used XC skies and now Topmeteo, I wonder what's the need to get the forecasted SKEW -T diagram to points along your task. Will you as, a pilot, get any better prediction of soaring conditions if you use both ? Dan i still like to use the forecast skew-t to help estimate the trigger time and temperature. also helps get a good idea of how the cu will develop during the day. whether they will spread out and create overcast or thin out as the boundary layer lifts into dryer air aloft, or blow up into thunderstorms. |
#3
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Is SKEW-T still important to soaring pilots ?
On Monday, February 29, 2016 at 12:22:12 PM UTC-5, wrote:
Having used XC skies and now Topmeteo, I wonder what's the need to get the forecasted SKEW -T diagram to points along your task. Will you as, a pilot, get any better prediction of soaring conditions if you use both ? Dan Within the bounds of science, people can interpret a SKEW-T differently. I like that. I think it's easier to "fact check" a SKEW-T against actual observations, and discern whether a certain sounding is actually a reasonable interpretation of a slice of atmosphere for a specific day/situation. Blipmaps and topmeteo are a computer's interpretation of a SKEW-T. I like to interpret it myself and compare it with the computer. |
#4
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Is SKEW-T still important to soaring pilots ?
It's fun to task "using the pretty colors" but perhaps easier to visualise wind shear at an inversion using SKEW-T, and if it'll be worth groveling in the inversion to get on top of it.
Jim |
#5
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Is SKEW-T still important to soaring pilots ?
On Monday, February 29, 2016 at 9:22:12 AM UTC-8, wrote:
Having used XC skies and now Topmeteo, I wonder what's the need to get the forecasted SKEW -T diagram to points along your task. Will you as, a pilot, get any better prediction of soaring conditions if you use both ? Dan Pretty maps tell you what is supposed to happen. Skew T tells you why -- and helps you to figure out why it's not happening. For example a "top of lift" occasioned by a very shallow intersection of adiabatic parcel with the surrounding air is a very different forecast than one with a hard inversion. Skew T shows the vertical profile of wind and direction. Skew T shows you how close you are to things not in the graphical forecast. How close to OD/not OD? How close to cirrus formation? John Cochrane |
#6
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Is SKEW-T still important to soaring pilots ?
On 2/29/2016 12:37 PM, John Cochrane wrote:
On Monday, February 29, 2016 at 9:22:12 AM UTC-8, wrote: Having used XC skies and now Topmeteo, I wonder what's the need to get the forecasted SKEW -T diagram to points along your task. Will you as, a pilot, get any better prediction of soaring conditions if you use both ? Dan Pretty maps tell you what is supposed to happen. Skew T tells you why -- and helps you to figure out why it's not happening. For example a "top of lift" occasioned by a very shallow intersection of adiabatic parcel with the surrounding air is a very different forecast than one with a hard inversion. Skew T shows the vertical profile of wind and direction. Skew T shows you how close you are to things not in the graphical forecast. How close to OD/not OD? How close to cirrus formation? John Cochrane Succinctly stated. I saw my first lapse rate diagram as a sketch on a napkin by my officemate before I'd ever been to a glider field; its predictive power was immediately apparent to me. (I still have it! And, I eventually learned the NWS had something called a Skewed-T plot.) Perhaps that's why I still prefer to generate my own daily forecasts from as primary data as is obtainable on any given day (sometimes, eyeballs-only!). Bob - a "Why?" kinda guy - W. |
#7
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Is SKEW-T still important to soaring pilots ?
and Skew-T is free, an important consideration for glider pilots
If you know how to interpret the Skew-T (or T-Phi) diagram then you can get all the information that the graphical forecasts provide and more. It just takes more effort and knowledge. (Which seems to be going the way predicted in Idiocracy.) |
#8
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Is SKEW-T still important to soaring pilots ?
Well... the SKEW-T logP is one of the most information rich diagrams one can find. If you know how to really "read" one, you can figure out lift strength, height, cloudbase, and winds from a single view at a glance. It takes me about 5 seconds to look at one to decide if it's a good day or not. That said, the modern interfaces in XCSkies, DrJack, etc. allow you to get a broader view of weather at a macro level including fantastic trend information. "North looks like it should have higher bases and more Cu than South" or "it's obvious that the models think the encroaching front shuts things down by late afternoon." HRRR is becoming incredibly useful for my forecasting as well.
So, the answer for me is "Yes, it's still very important." But since they are a point forecast, they aren't the only thing I look at. |
#9
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Is SKEW-T still important to soaring pilots ?
Papa3, what is HRRR ???
On Monday, February 29, 2016 at 8:33:35 PM UTC-5, Papa3 wrote: Well... the SKEW-T logP is one of the most information rich diagrams one can find. If you know how to really "read" one, you can figure out lift strength, height, cloudbase, and winds from a single view at a glance. It takes me about 5 seconds to look at one to decide if it's a good day or not. That said, the modern interfaces in XCSkies, DrJack, etc. allow you to get a broader view of weather at a macro level including fantastic trend information. "North looks like it should have higher bases and more Cu than South" or "it's obvious that the models think the encroaching front shuts things down by late afternoon." HRRR is becoming incredibly useful for my forecasting as well. So, the answer for me is "Yes, it's still very important." But since they are a point forecast, they aren't the only thing I look at. |
#10
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Is SKEW-T still important to soaring pilots ?
On Tuesday, March 1, 2016 at 7:36:02 AM UTC-6, wrote:
Papa3, what is HRRR ??? On Monday, February 29, 2016 at 8:33:35 PM UTC-5, Papa3 wrote: Well... the SKEW-T logP is one of the most information rich diagrams one can find. If you know how to really "read" one, you can figure out lift strength, height, cloudbase, and winds from a single view at a glance. It takes me about 5 seconds to look at one to decide if it's a good day or not.. That said, the modern interfaces in XCSkies, DrJack, etc. allow you to get a broader view of weather at a macro level including fantastic trend information. "North looks like it should have higher bases and more Cu than South" or "it's obvious that the models think the encroaching front shuts things down by late afternoon." HRRR is becoming incredibly useful for my forecasting as well. So, the answer for me is "Yes, it's still very important." But since they are a point forecast, they aren't the only thing I look at. High Resolution Rapid Refresh http://rapidrefresh.noaa.gov/HRRRncep/ Get ready to be overloaded with data. |
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