winds aloft decoding plz

[mmilano]

can someone clarify what i'm looking at here? i've always got winds aloft from a breifer. i should know how to read this.

BLH 0328 0619+12 0219+08 0324+02 0223-14 3233-27 314343 304052 293558 0419+10
Blythe CA [BLH]

 

[deafsound]

BLH 0328 0619+12 0219+08 0324+02 0223-14 3233-27 314343 304052 293558 0419+10
Blythe CA [BLH]

For the bold faced one it's winds from 060 at 19kts temp +12c

For the italic one it's winds from 290 at 25kts -58c (all temps above 24000 feet are negative).

not sure what the underlined one is. From another winds aloft, perhaps?

Also, you will see forecasts like this from time to time: 761349

for the first two #s you subtract 50 to get 26

for the second two #s you add 100 to get 13

the last two numbers are tempurature (49)

So that would be winds from 260 at 113kts -49C

 

[mmilano]

thanks a lot. so what does each seperate set of wind/temp info pertain to?

 

[ejensen]

not sure what the underlined one is. From another winds aloft, perhaps?

Looks like the line came from duat briefing. So that would be the wind interpolated for the requested altitude.

 

[SkyHog]

thanks a lot. so what does each seperate set of wind/temp info pertain to?

you're missing the line above it. It should say

3000 6000 9000 12000 18000 24000 etc. etc.


It refers to the altitude

 

[cherokeeflyboy]

can someone clarify what i'm looking at here? i've always got winds aloft from a breifer. i should know how to read this.

From Aviation Weather Services (AC 00-45E)
Avaiable on line at http://www.airweb.faa.gov/Regulator...702EF0BFE021AB3986256BB2005C1458?OpenDocument

WINDS AND TEMPERATURES ALOFT FORECAST (FD)
Winds and temperatures aloft are forecasted for specific locations in the contiguous U.S., as shown in
Figure 4-9. The FD forecasts are also prepared for a network of locations in Alaska and Hawaii as shown
in Figure 4-10. Forecasts are made twice daily based on the 00Z and 12Z radiosonde data for use during
specific time intervals.
Below is a sample FD message containing a heading and two FD locations. The heading always includes
the time during which the FD may be used (0500-0900Z in the example) and a notation “TEMPS NEG
ABV 24000.” Since temperatures above 24,000 feet are always negative, the minus sign is omitted.
Example of FD report:
DATA BASED ON 010000Z
VALID 010600Z FOR USE 0500-0900Z. TEMPS NEG ABV 24000
FT 3000 6000 9000 12000 18000 24000 30000 34000 39000
MKC 2426 2726-09 2826-14 2930-21 2744-32 2751-41 275550 276050 731960
ABQ 1912+15 1914+07 1917-06 1820-17 172132 171942 192054
Explanation of FD:
The data are based on the radiosonde information from the 1st day of the month at 00Z. The second line
describes the valid time. In this example, the valid time is the 1st at 06Z for use on the 1st between 05-
09Z. Temperatures are negative above 24,000 feet. The line labeled “FT” indicates the levels of the
wind and temperature data. Through 12,000, feet the levels are true altitude. From 18,000 feet and
above, the levels are pressure altitude. The 45,000-foot and 53,000-foot levels are also available. The
pilot may request these levels from the FSS briefer. A six-digit group shows wind direction, in reference
to true north, wind speed in knots, and temperature in degrees Celsius.
Note the Kansas City, MO (MKC), forecast for 3,000 feet. The group “2426” means the wind is from
240 degrees at 26 knots. The first two digits give direction in tens of degrees and the second two digits
are the wind speed in knots. In the MKC forecast, the coded group for 9,000 feet is “2826-14.” The
wind is from 280 degrees at 26 knots and the temperature is negative 14 degrees Celsius. Note in the
Albuquerque (ABQ) 3,000- and 6,000-foot examples that the wind group is omitted. No winds are
forecasted within 1,500 feet of station elevation. Also, no temperatures are forecasted for any level
within 2,500 feet of station elevation. (See MKC 3000 example.)
If a wind direction is coded between 51 and 86, the wind speed is 100 knots or greater. For example, the
MKC forecast for 39,000 feet is “731960.” To decode this, subtract 50 from the wind direction and add
100 knots to the wind speed. Thus, the wind direction is from 230 degrees (73-50=23) and the speed is
119 knots (100+19=119). The temperature is minus 60 degrees Celsius. If the wind speed is forecasted
to be 200 knots or greater, the wind group is coded as 99 knots. For example, “7799” is decoded as 270
degrees at 199 knots or greater. When the forecast speed is less than 5 knots, the coded group is “9900”
and read, “LIGHT AND VARIABLE.”
Examples of decoding FDs:
Coded Decoded
9900+00 Wind light and variable, temperature 0 degrees Celsius
2707 270 degrees at 7 knots
850552 350 degrees (85-50=35) at 105 knots (100+05=105), temperature -52 degrees Celsius

 

[mmilano]

yeah, it came from duats. nick told me i could get forcasted winds aloft there so i dug around and found it. and yeah, i probably missed the line above

it makes sense now.

thanks for the link kd.