NOTE: The nws-changes mailing list is no longer active. The list archives are made available for historical reasons.
TO AWIPS/NOAAPORT USERS... FAMILY OF SERVICES /FOS/
SUBSCRIBERS EMERGENCY MANAGERS WEATHER INFORMATION
NETWORK /EMWIN/NATIONAL WEATHER SERVICE /NWS/
CUSTOMERS... WAFS USERS... GTS USERS... NWS FAX CHART USERS...
AND NWS FTP SERVER USERS
FROM RTH WASHINGTON DATA MANAGEMENT
SUBJECT ETA MODEL CHANGE
EFFECTIVE DATE JULY 8... 2003
ON THE ABOVE EFFECTIVE DATE... SELECTED ETA MODEL
OUTPUT FILES ON THE NWS FTP SERVERS WILL INCREASE IN
SIZE. WITH THIS IMPLEMENTATION... 20 NEW OUTPUT PARAMETERS
WILL BE AVAILABLE IN THESE FILES. THESE NEW
PARAMETERS WILL PROVIDE A SIGNIFICANT LEVEL OF DETAIL
ABOUT THE STATE OF AND THE PROCESSES ACTIVE IN THE LAND-
SURFACE PHYSICS SCHEME OF THE ETA MODEL. THE DIRECTORIES/
FILES IMPACTED BY THIS IMPLEMENTATION ARE
DIRECTORIES
/SL.us008001/ST.opnl/MT.eta_CY.{CC}/RD.{YYYYMMDD}/PT.grid_DF.gr1/
FILES
fh.{hhhh}_tl.press_gr.awip12
(from 21 Mb each to 40 Mb each [19 Mb increase])
fh.{hhhh}_tl.press_gr.awip3d
(from 14 Mb each to 15 Mb each [1 Mb increase])
fh.{hhhh}_tl.press_gr.awipak
(from 9.5 Mb each to 10.0 Mb each [0.5 Mb increase])
fh.{hhhh}_tl.press_gr.egrdsf
(from 60 Mb each to 82 Mb each [22 Mb increase])
fh.{hhhh}_tl.press_gr.awip20
(from 6.0 Mb each to 7.2 Mb each [1.2 Mb increase])
ADDITIONALLY... BASED ON REQUESTS FROM NCEP/HPC... ALASKA
AND WESTERN REGIONS... THE CURRENT PROCEDURE OF SETTING
NO FREEZING LEVEL LOWER THAN THE MODEL TERRAIN HEIGHT
WILL BE MODIFIED. INSTEAD... IF EITHER THE HIGHEST OR LOWEST
FREEZING LEVEL FALLS BELOW THE ELEVATION OF THE MODEL
TERRAIN... THE HEIGHT WHERE THE ZERO DEGREE TEMPERATURE
WOULD BE REACHED WILL BE ESTIMATED BY EXTRAPOLATING
THE FIRST ATMOSPHERIC LAYER TEMPERATURE TO ZERO
ASSUMING A STANDARD LAPSE RATE OF 0.0065 DEG C PER METER
ELEVATION CHANGE. FREEZING LEVEL HEIGHTS WILL NOW BE
CONTINUOUS WITH THIS CHANGE. THERE IS A LOWER LIMIT
OF -1000 M APPLIED WHEN THESE ELEVATION ESTIMATES FALL
BELOW SEA-LEVEL AND AN UPPER LIMIT OF 99999 M.
BOTH OF THESE LIMITS ARE CONSISTENT WITH WHAT IS CURRENTLY
BEING OUTPUT BY THE GLOBAL FORECAST SYSTEM (GFS).
ADDITIONAL INFORMATION ON THIS CHANGE CAN BE OBTAINED
FROM DATA MANAGEMENT CHANGE NUMBER DM 03-03.28 -
NOTICE OF INTENT TO CHANGE OPERATIONAL ETA MODEL ON THE
DATA MANAGEMENT CHANGE NOTICES PAGE AT
HTTP /COLON/ //WWW.NWS.NOAA.GOV/DATAMGMT/INDEX.HTML
FOR FOS/NOAAPORT AND NON-AWIPS CUSTOMERS - IF YOU HAVE
ANY QUESTIONS REGARDING THIS NOTICE... PLEASE CONTACT
DATA MANAGEMENT
LOWER CASE
THIS INFORMATION IS ALSO POSTED ON THE NWS DATA MANAGEMENT
CHANGE NOTICES WEB PAGE. THE URL IS LISTED BELOW.
HTTP /COLUN/ //WWW.NWS.NOAA.GOV/DATAMGMT/INDEX.HTML
DATA MANAGEMENT
TELECOMMUNICATION OPERATIONS CENTER
RTH WASHINGTON SENDS
---------- End Forwarded Message ----------
nws-changes archives: