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 />
(wind shear conditions) may be used, and no further numeric data will be given. If no wind shear<br />
is forecast, then this group is omitted.<br />
Icing Group<br />
This group consists of six numbers only and begins with a “6.” It is used to forecast nonthunderstorm<br />
icing (the presence of thunderstorms implies moderate or greater icing), and is<br />
repeated as often as necessary to indicate multiple icing layers. The group is omitted if no icing<br />
is forecasted. The following example illustrates the decoding of the icing group:<br />
641104<br />
The “6” indicates that icing is forecasted. The next digit, “4,” is the type of forecasted icing from<br />
Table 6-6 (moderate icing). If more than one type of icing is forecast within the same stratum of<br />
air, the highest code Figure–the most severe–will be used. The next three digits, “110,” indicate<br />
the height of the base of the icing stratum in hundreds of feet AGL, which is 11,000' AGL in this<br />
case. If the numbers “000” are used, this would indicate icing occurring at or below 100 feet<br />
AGL. The last digit, “4,” is the thickness of the icing layer in thousands of feet (4000' here) using<br />
numbers 1 through 9. If layer is thicker than 9000 feet, the icing group is repeated so that the<br />
base of the repeated group coincides with the top of the first encoded icing group. If multiple<br />
layers are forecasted that are not related to each other, the layers are encoded in an ascending<br />
order.<br />
Ic TYPE OF ICING B TYPE OF TURBULENCE<br />
Code Description Code Description<br />
0 No icing 0 None<br />
1 Light icing 1 Light turbulence<br />
2 Light icing in cloud 2 Moderate turbulence in clear air,<br />
occasional<br />
3 Light icing in precipitation 3 Moderate turbulence in clear air, frequent<br />
4 Moderate icing 4 Moderate turbulence in cloud, occasional<br />
5 Moderate icing in cloud 5 Moderate turbulence in cloud, frequent<br />
6 Moderate icing in<br />
precipitation<br />
6 Severe turbulence in clear air, occasional<br />
7 Severe icing 7 Severe turbulence in clear air, frequent<br />
8 Severe icing in cloud 8 Severe turbulence in cloud, occasional<br />
9 Severe icing in precipitation 9 Severe turbulence in cloud, frequent<br />
X<br />
Extreme turbulence<br />
Table 6-6 — TAF Icing and Turbulence Codes<br />
6-18 Version 3.2/Dec 08
Change language