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420
NOUS41 KWBC 121434
PNSWSH
TECHNICAL IMPLEMENTATION NOTICE 06-31
NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC
1035 AM EDT FRI MAY 12 2006
TO: NATIONAL WEATHER SERVICE /NWS/ OFFICES
FAMILY OF SERVICES /FOS/ SUBSCRIBERS
FEDERAL AVIATION ADMINISTRATION /FAA/ OFFICES
OTHER NWS AVIATION CUSTOMERS AND PARTNERS
FROM: KEVIN L. JOHNSTON
CHIEF...AVIATION SERVICES BRANCH
SUBJECT: STANDARDIZATION OF AIRMET TEXT PRODUCTS ISSUED FOR THE
CONUS: EFFECTIVE JULY 25 2006.
NOTE: THE FOLLOWING IMPLEMENTATION WILL HAVE NO IMPACT ON NOAA
WEATHER WIRE SERVICE SUBSCRIBERS.
EFFECTIVE TUESDAY JULY 25 2006 ... BEGINNING AT 1345 COORDINATED
UNIVERSAL TIME /UTC/ ... NWS WILL IMPLEMENT FORMAT CHANGES TO
STANDARDIZE THE AIRMENS METEOROLOGICAL INFORMATION /AIRMET/ TEXT
PRODUCTS. THE PRODUCT IS ISSUED BY THE AVIATION WEATHER CENTER
/AWC/ IN KANSAS CITY MISSOURI FOR THE CONTERMINOUS UNITED STATES
/CONUS/ AND ADJACENT COASTAL WATERS. SEE TABLE 1 BELOW.
THE FOLLOWING AIRMET STANDARDS WILL BE IMPLEMENTED FOR ALL
AIRMETS:
1. THE FREQUENCY OF THE HAZARD OCCURRENCE /OCNL/ AND /FRQ/ WILL
NO LONGER BE INCLUDED.
2. TREND REMARKS WILL NO LONGER BE INCLUDED.
3. THE 6 TO 12-HOUR FORECAST OUTLOOK AREAS WILL BE DELINEATED
WITH HIGH ALTITUDE VOR LOCATIONS PRECEDED WITH THE /BOUNDED
BY/ DESCRIPTOR.
4. THE REASON FOR AMENDING ... CORRECTING OR CANCELING AN
AIRMET WILL NO LONGER BE INCLUDED.
5. SIGMET REFERENCE STATEMENTS WILL NOT REFER TO THE SIGMET
HAZARD. STATEMENTS SUCH AS /FOR AREAS OF POSS SEV TURB/ AND
/FOR AREAS OF POSS SEV ICE/ WILL NO LONGER BE INCLUDED.
INSTEAD THE STATEMENT /SEE SIGMET XXXX SERIES/ WILL BE USED.
FOR EXAMPLE ... /SEE SIGMET TANGO SERIES/.
THE FOLLOWING AIRMET STANDARDS WILL BE IMPLEMENTED FOR ALL AIRMET
SIERRA:
1. AIRMET IFR: THE CAUSE OF THE VISIBILITY RESTRICTION WILL BE
LIMITED TO /PCPN/ ... /FU/ ... /HZ/ ... /BR/ ... /FG/ AND /BLSN/.
2. AIRMET MTN OBSCN: THE CAUSE OF THE OBSCURATION WILL BE
LIMITED TO /CLDS/ ... /PCPN/ ... /FU/ ... /HZ/ ... /BR/ AND /FG/.
THE FOLLOWING AIRMET STANDARDS WILL BE IMPLEMENTED FOR ALL AIRMET
TANGO:
1. AIRMET TURB: THE CAUSE OF THE TURBULENCE WILL NO LONGER BE
INCLUDED.
2. AIRMET STG SFC WND: THE CAUSE AND DIRECTION OF THE WIND WILL
NO LONGER BE INCLUDED.
3. LLWS POTENTIAL: WILL INCLUDE A LIST OF AFFECTED STATES.
4. LLWS POTENTIAL: WILL BE DELINEATED USING HIGH ALTITUDE VOR
LOCATIONS PRECEDED BY THE /BOUNDED BY/ DESCRIPTOR.
5. LLWS POTENTIAL: LLWS INFORMATION WILL NOT INCLUDE PHRASES
SUCH AS /BLW 2000 FT/ OR /BLW AGL 020/.
6. LLWS POTENTIAL: THE CAUSE OF THE LLWS WILL NO LONGER BE INCLUDED.
THE FOLLOWING AIRMET STANDARDS WILL BE IMPLEMENTED FOR ALL AIRMET
ZULU:
1. AIRMET ICE: THE ICING TYPES /RIME/ ... /MXD/ AND /CLR/ WILL
NO LONGER BE INCLUDED.
2. AIRMET ICE: THE LOCATION OF ICING WITH RESPECT TO CLOUDS AND
PRECIPITATION /ICGICIP/ ... /ICGIC/ AND /ICGIP/ WILL NO
LONGER BE INCLUDED. INSTEAD THE TERM /ICE/ WILL BE USED.
3. THE FREEZING LEVEL WILL BE DEFINED AS THE LOWEST FREEZING
LEVEL ABOVE GROUND LEVEL OR /SFC/ AS APPROPRIATE.
4. FREEZING LEVELS WILL BE DELINEATED USING HIGH ALTITUDE VOR
LOCATIONS AT INTERVALS OF 4000 FEET ABOVE MEAN SEA LEVEL OR
/SFC/ AS APPROPRIATE. FREEZING LEVEL DESCRIPTIONS WILL NOT
INCLUDE STATES ... PORTIONS OF STATES OR GEOGRAPHICAL AREAS.
5. AREAS WITH MULTIPLE FREEZING LEVELS ABOVE THE GROUND WILL BE
DELINEATED USING HIGH ALTITUDE VOR LOCATIONS PRECEDED WITH
THE /BOUNDED BY/ DESCRIPTOR.
6. THE RANGE OF FREEZING LEVELS OVER THE AREA WILL BE INCLUDED.
TABLE 1: PRODUCTS AFFECTED BY THIS CHANGE
WMO HEADER AWIPS IDDESCRIPTION PORTION OF CONUS
----------------------------------------------------------
WAUS41 KKCI MKCWA1SAIRMET SIERRANORTHEASTERN
WAUS41 KKCI MKCWA1TAIRMET TANGONORTHEASTERN
WAUS41 KKCI MKCWA1ZAIRMET ZULUNORTHEASTERN
----------------------------------------------------------
WAUS42 KKCI MKCWA2SAIRMET SIERRASOUTHEASTERN
WAUS42 KKCI MKCWA2TAIRMET TANGOSOUTHEASTERN
WAUS42 KKCI MKCWA2ZAIRMET ZULUSOUTHEASTERN
----------------------------------------------------------
WAUS43 KKCI MKCWA3SAIRMET SIERRANORTH CENTRAL
WAUS43 KKCI MKCWA3TAIRMET TANGONORTH CENTRAL
WAUS43 KKCI MKCWA3ZAIRMET ZULUNORTH CENTRAL
----------------------------------------------------------
WAUS44 KKCI MKCWA4SAIRMET SIERRASOUTH CENTRAL
WAUS44 KKCI MKCWA4TAIRMET TANGOSOUTH CENTRAL
WAUS44 KKCI MKCWA4ZAIRMET ZULUSOUTH CENTRAL
----------------------------------------------------------
WAUS45 KKCI MKCWA5SAIRMET SIERRAROCKY MOUNTAIN
WAUS45 KKCI MKCWA5TAIRMET TANGOROCKY MOUNTAIN
WAUS45 KKCI MKCWA5ZAIRMET ZULUROCKY MOUNTAIN
----------------------------------------------------------
WAUS46 KKCI MKCWA6SAIRMET SIERRAPACIFIC COAST
WAUS46 KKCI MKCWA6TAIRMET TANGOPACIFIC COAST
WAUS46 KKCI MKCWA6ZAIRMET ZULUPACIFIC COAST
A DETAILED DESCRIPTION OF THESE CHANGES WITH EXAMPLES MAY BE
FOUND ON THE INTERNET AT /USE LOWER CASE LETTERS/:
HTTP://AVIATIONWEATHER.GOV/NOTICE/AIRMET/
IF YOU HAVE ANY QUESTIONS CONCERNING THESE CHANGES CONTACT:
CLINTON WALLACE
CHIEF AVIATION SUPPORT BRANCH
AVIATION WEATHER CENTER
KANSAS CITY MISSOURI 64153
PHONE: 816-584-7248
E-MAIL: CLINTON.WALLACE@xxxxxxxx
THIS AND OTHER NWS TECHNICAL IMPLEMENTATION NOTICES ARE AVAILABLE
ONLINE AT /USE LOWER CASE LETTERS/:
HTTP://WWW.NWS.NOAA.GOV/OM/NOTIF.HTM
$$
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