JPATS Weather - NETC
JPATS Weather - NETC
JPATS Weather - NETC
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
<strong>JPATS</strong> AVIATION WEATHER BOOKLET<br />
VISIBILITY CONVERSION TABLE - STATUE MILES TO METERS<br />
Statute Miles Meters Statue Miles Meters Statute Miles Meters<br />
0 0 3/4 1200 1 7/8 3000<br />
1/16 100 7/8 1400 2 3200<br />
1/8 200 1 1600 2 1/4 3600<br />
3/16 300 1 1/8 1800 2 1/2 4000<br />
1/4 400 1 1/4 2000 3 4800<br />
5/16 500 1 3/8 2200 4 6000 a<br />
3/8 600 1 1/2 2400 5 8000<br />
1/2 800 1 5/8 2600 6 9000 b<br />
5/8 1000 1 3/4 2800 7 9999<br />
Notes: a Rounded down from 6400m; b Rounded down from 9600m.<br />
Table 6-5 — Reportable Visibility Values for TAFs<br />
If any significant weather or an obstruction to vision is forecast (rain, snow, sleet, hail, blowing<br />
dust, etc.), it will be included after visibility, using the codes in Table 6-2. If there is no<br />
significant weather, this group will be omitted.<br />
Sky Condition Group<br />
This group(s) will be included as often as necessary to indicate all forecast cloud layers–up to the<br />
first overcast layer (8/8ths)–in ascending order of cloud bases, with lowest layer first (Figure 6-<br />
20).<br />
KNSE TAF 260909 28004KT 9000 HZ SCT020 SCT200 QNH2998INS<br />
Figure 6-20 — TAF Sky Condition Group<br />
As with METARs, TAF sky conditions will consist of five or six characters. The first two or<br />
three letters indicate the amount of sky coverage, from Table 6-3, above, and the last three digits<br />
indicate the height of the cloud bases in hundreds of feet AGL.<br />
The types of clouds will not be forecast with the exception of cumulonimbus (CB), which will<br />
always be given as a separate layer (e.g., SCT005CB). In the event of a partial obscuration, it<br />
will be considered the first cloud layer and will be reported as FEW000, SCT000, or BKN000.<br />
Special Wind Shear Group<br />
An entry such as “WS020/22030KT” indicates the presence of wind shear. The three digits<br />
before the slash indicate the altitude (AGL), and the characters following the slash indicate wind<br />
direction and speed. North American stations will insert this special non-convective wind shear<br />
group immediately after the cloud group when it is forecast for altitudes 2000 feet AGL and<br />
below. However, if it cannot be forecast with accuracy, a less specific format of “WSCONDS”<br />
Version 3.2/Dec 08 6-17
Change language