AOPA Pilot Magazine - June 2021 - 79

THE WX CHARTS WEBSITE (above)

depicts GFS model output, showing an overview of conditions
seven days in the future, with a
valid time of April 25 at 18Z. Click
on the " +CHART " link at left to
select other weather variables. By
clicking on a place of interest on
the map, you can call up a
meteogram in the split-screen
view, which shows conditions
expected five days in the future.
We clicked on Columbia, South
Carolina (red dot). Wx Charts
can also show conditions in other
regions and nations-click on the
" +REGION " link from the menu on
the left side of the page.

and the RUC (Rapid Update Cycle) only projects two days out. So, it's worthwhile for pilots
who want a long view to shake hands with the
GFS' products and presentations. At the same
time, let's bear in mind that forecast accuracy
declines with time. Forecasts for five days out
can be accurate, but nobody should bet on any
forecast longer than that. Still, it can be interesting to keep checking each day in the forecast
cycle to see if the model stays somewhat true to
its original guidance, or if it's changeable and
takes different directions.
Models generally observe certain conventions. They tell when each model run has
been initialized (the GFS is updated every six
hours) and identify the valid time for the model

products. You'll see this information at the top or
bottom border of a forecast product image. The
most recent model run, of course, will give the
more accurate information. For example, on one
corner you might see " Cloud Cover, Total (%) "
and beneath it something like " F93 Valid: Thu
2021-03-25 09Z, " and in another corner " Init:
Sun 2021-03-21 12Z GFS. " Translated, this means
that the image you're looking at is a 93-hour forecast valid for March 25, 2021, at 09Z, and that
the model was initialized on Sunday March 21,
2021, at 12Z. To select a certain valid time there's
often either a cluster of buttons with valid times
in each, a time-slider (like the one in the GFA
Tool), a mouseover feature, or a loop capability
that lets you animate the forecast.
aopa.org/pilot AOPA PILOT | 79


http://www.aopa.org/pilot

AOPA Pilot Magazine - June 2021

Table of Contents for the Digital Edition of AOPA Pilot Magazine - June 2021

Contents
AOPA Pilot Magazine - June 2021 - Intro
AOPA Pilot Magazine - June 2021 - Cover1
AOPA Pilot Magazine - June 2021 - Cover2
AOPA Pilot Magazine - June 2021 - Contents
AOPA Pilot Magazine - June 2021 - 2
AOPA Pilot Magazine - June 2021 - 3
AOPA Pilot Magazine - June 2021 - 4
AOPA Pilot Magazine - June 2021 - 5
AOPA Pilot Magazine - June 2021 - 6
AOPA Pilot Magazine - June 2021 - 7
AOPA Pilot Magazine - June 2021 - 8
AOPA Pilot Magazine - June 2021 - 9
AOPA Pilot Magazine - June 2021 - 10
AOPA Pilot Magazine - June 2021 - 11
AOPA Pilot Magazine - June 2021 - 12
AOPA Pilot Magazine - June 2021 - 13
AOPA Pilot Magazine - June 2021 - 14
AOPA Pilot Magazine - June 2021 - 15
AOPA Pilot Magazine - June 2021 - 16
AOPA Pilot Magazine - June 2021 - 17
AOPA Pilot Magazine - June 2021 - 18
AOPA Pilot Magazine - June 2021 - 19
AOPA Pilot Magazine - June 2021 - 20
AOPA Pilot Magazine - June 2021 - 21
AOPA Pilot Magazine - June 2021 - 22
AOPA Pilot Magazine - June 2021 - 23
AOPA Pilot Magazine - June 2021 - 24
AOPA Pilot Magazine - June 2021 - 25
AOPA Pilot Magazine - June 2021 - 26
AOPA Pilot Magazine - June 2021 - 27
AOPA Pilot Magazine - June 2021 - 28
AOPA Pilot Magazine - June 2021 - 29
AOPA Pilot Magazine - June 2021 - 30
AOPA Pilot Magazine - June 2021 - 31
AOPA Pilot Magazine - June 2021 - 32
AOPA Pilot Magazine - June 2021 - 33
AOPA Pilot Magazine - June 2021 - 34
AOPA Pilot Magazine - June 2021 - 35
AOPA Pilot Magazine - June 2021 - 36
AOPA Pilot Magazine - June 2021 - 37
AOPA Pilot Magazine - June 2021 - 38
AOPA Pilot Magazine - June 2021 - 39
AOPA Pilot Magazine - June 2021 - 40
AOPA Pilot Magazine - June 2021 - 41
AOPA Pilot Magazine - June 2021 - 42
AOPA Pilot Magazine - June 2021 - 43
AOPA Pilot Magazine - June 2021 - 44
AOPA Pilot Magazine - June 2021 - 45
AOPA Pilot Magazine - June 2021 - 46
AOPA Pilot Magazine - June 2021 - 47
AOPA Pilot Magazine - June 2021 - 48
AOPA Pilot Magazine - June 2021 - 49
AOPA Pilot Magazine - June 2021 - 50
AOPA Pilot Magazine - June 2021 - 51
AOPA Pilot Magazine - June 2021 - 52
AOPA Pilot Magazine - June 2021 - 53
AOPA Pilot Magazine - June 2021 - 54
AOPA Pilot Magazine - June 2021 - 55
AOPA Pilot Magazine - June 2021 - 56
AOPA Pilot Magazine - June 2021 - 57
AOPA Pilot Magazine - June 2021 - 58
AOPA Pilot Magazine - June 2021 - 59
AOPA Pilot Magazine - June 2021 - 60
AOPA Pilot Magazine - June 2021 - 61
AOPA Pilot Magazine - June 2021 - 62
AOPA Pilot Magazine - June 2021 - 63
AOPA Pilot Magazine - June 2021 - 64
AOPA Pilot Magazine - June 2021 - 65
AOPA Pilot Magazine - June 2021 - 66
AOPA Pilot Magazine - June 2021 - 67
AOPA Pilot Magazine - June 2021 - 68
AOPA Pilot Magazine - June 2021 - 69
AOPA Pilot Magazine - June 2021 - 70
AOPA Pilot Magazine - June 2021 - 71
AOPA Pilot Magazine - June 2021 - 72
AOPA Pilot Magazine - June 2021 - 73
AOPA Pilot Magazine - June 2021 - 74
AOPA Pilot Magazine - June 2021 - 75
AOPA Pilot Magazine - June 2021 - 76
AOPA Pilot Magazine - June 2021 - 77
AOPA Pilot Magazine - June 2021 - 78
AOPA Pilot Magazine - June 2021 - 79
AOPA Pilot Magazine - June 2021 - 80
AOPA Pilot Magazine - June 2021 - 81
AOPA Pilot Magazine - June 2021 - 82
AOPA Pilot Magazine - June 2021 - 83
AOPA Pilot Magazine - June 2021 - 84
AOPA Pilot Magazine - June 2021 - 85
AOPA Pilot Magazine - June 2021 - 86
AOPA Pilot Magazine - June 2021 - 87
AOPA Pilot Magazine - June 2021 - 88
AOPA Pilot Magazine - June 2021 - 89
AOPA Pilot Magazine - June 2021 - 90
AOPA Pilot Magazine - June 2021 - 91
AOPA Pilot Magazine - June 2021 - 92
AOPA Pilot Magazine - June 2021 - 93
AOPA Pilot Magazine - June 2021 - 94
AOPA Pilot Magazine - June 2021 - 95
AOPA Pilot Magazine - June 2021 - 96
AOPA Pilot Magazine - June 2021 - 97
AOPA Pilot Magazine - June 2021 - 98
AOPA Pilot Magazine - June 2021 - 99
AOPA Pilot Magazine - June 2021 - 100
AOPA Pilot Magazine - June 2021 - 101
AOPA Pilot Magazine - June 2021 - 102
AOPA Pilot Magazine - June 2021 - 103
AOPA Pilot Magazine - June 2021 - 104
AOPA Pilot Magazine - June 2021 - 105
AOPA Pilot Magazine - June 2021 - 106
AOPA Pilot Magazine - June 2021 - 107
AOPA Pilot Magazine - June 2021 - 108
AOPA Pilot Magazine - June 2021 - 109
AOPA Pilot Magazine - June 2021 - 110
AOPA Pilot Magazine - June 2021 - 111
AOPA Pilot Magazine - June 2021 - 112
AOPA Pilot Magazine - June 2021 - Cover3
AOPA Pilot Magazine - June 2021 - Cover4
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