most recent model run

                               

Feb. 2014

Index Premium member
E.g NAO - North Atlantic Oscillation

Nov. 2013

Event probability Premium member
E.g. Probability of 10m-level wind speed > 20 kts

Feb. 2013

NAVGEM
Navy Global Environmental Model replaces NOGAPS

Feb. 2012

HIRLAM 0.05°
Subregions: France, Spain

Jan. 2012

HIRLAM
Hirlam "Agencia Estatal de Meteorología (AEMET)"

Jan. 2012

YRNO
Norway forecast model "Meteorologisk institutt met.no"

Jan. 2012

NAM
North American Mesoscale Forecast System "NOAA"

Dec. 2011

GFS ENS Cluster
Europe

Nov. 2010

BOM
Australien Bureau of Meteorology

Nov. 2010

KNMI

Oct. 2010

GME

Global weather forecast model from the German Weather Service. E.g.:

Sept. 2010

ECMWFTS Ensemble

E.g.:
 

July 2010

ECMWF Ensemble

Global Ensemble weather forecast from the "European Centre for Medium-Range Weather Forecasts". E.g.:

May 2010

ECMWF

Additional time steps: 0, 24, 48
Additional parameter: SLP/Temp. 850 hPa

March 2010

Wet bulb freezing level

March 2010

Maximum wind velocity

Feb. 2010

Compare charts of various models

Is there a difference in forecast between the different models?
The panel shows different model forecasts for the same parameter and the same forecast period and basis.

Feb. 2010

Compare recent model runs

How precise is the forecast of each model long-term?


The forecasts of the most recent model runs for one forecast date are displayed.

Feb. 2010

Compare recent model runs [P]

How precise ist the forecast of a single model long-term in comparison to another model?
This panel shows the most current forecasts of all models and the forecast of older runs for the same forecast date.

Jan. 2010

Compare parameters

Jan. 2010

Introduction to Expert Charts
Video:

July 2010

GFS upgrade


NOUS41 KWBC 191802 AAB
PNSWSH

TECHNICAL IMPLEMENTATION NOTICE 10-15... AMENDED NATIONAL WEATHER SERVICE HEADQUARTERS WASHINGTON DC 158 AM EDT MON JUL 19 2010

TO:

SUBSCRIBERS: -FAMILY OF SERVICES -NOAA WEATHER WIRE SERVICE -EMERGENCY MANAGERS WEATHER INFORMATION NETWORK -NOAAPORT OTHER NWS PARTNERS...USERS AND EMPLOYEES

FROM:

TIMOTHY MCCLUNG SCIENCE PLANS BRANCH CHIEF OFFICE OF SCIENCE AND TECHNOLOGY

SUBJECT:

AMENDED DATE: GLOBAL FORECAST SYSTEM CHANGES: RESCHEDULED FOR JULY 28 2010

REFER TO:

TECHNICAL IMPLEMENTATION NOTICE /TIN/ 10-15 TRANSMITTED APRIL 2 2010...AMENDED TIN 10-15 TRANSMITTED JUNE 14 2010

DUE TO THE COMPLEXITY OF THE IMPLEMENTATION OF THE GLOBAL FORECAST SYSTEM AND ALL DOWNSTREAM DEPENDENCIES...THE EFFECTIVE DATE OF THE UPGRADE IS BEING RESCHEDULED FOR WEDNESDAY JULY 28. IF THE NWS DECLARES A CRITICAL WEATHER DAY ON OR AROUND JULY 28 THE IMPLEMENTATION MIGHT BE DELAYED. ANOTHER TIN WILL BE SENT IF THIS OCCURS.

EFFECTIVE JULY 28 2010...BEGINNING WITH THE 1200 COORDINATED UNIVERSAL TIME /UTC/ RUN...THE NATIONAL CENTERS FOR ENVIRONMENTAL PREDICTION /NCEP/ WILL UPGRADE THE GLOBAL FORECAST SYSTEM /GFS/. THE RESOLUTION OF THE GLOBAL FORECAST MODEL WILL BE INCREASED FROM T382 /35 KM/ TO T574 /27 KM/. THE HIGH RESOLUTION PORTION OF THE FORECAST WILL BE EXTENDED FROM 180 HRS TO 192 HRS. WITH THIS EXTENSION 3 HOURLY OUTPUT WILL BE MADE AVAILABLE OUT TO 192 HOURS.

THIS WILL RESULT IN SIGNIFICANT CHANGES IN THE DEFINITION OF PARAMETERS IN THE 192 HOUR PRESSURE GRIB /PGRB/ AND FLUX FILES. THERE WILL ALSO BE SIGNIFICANT CHANGES IN MODEL PHYSICS ASSOCIATED WITH THIS CHANGE. IN ADDITION MODIFICATIONS WILL BE MADE TO THE CONTENTS OF THE GLOBAL DATA ASSIMILATION SYSTEM /GDAS/ AND GFS PGRB FILES.

CHANGES IN MODEL PHYSICS INCLUDE:

RADIATION AND CLOUD OVERLAP
GRAVITY WAVE DRAG
HURRICANE RELOCATION
NEW PLANETARY BOUNDARY LAYER SCHEME
NEW MASS FLUX SHALLOW CONVECTION
UPDATED DEEP CONVECTION SCHEME
POSITIVE DEFINITE TRACER TRANSPORT SCHEME

THE NEW PARAMETER FOR THE GFS FORECAST PRESSURE GRIB FILE IS:

MAX WIND GUST

SEVERAL PARAMETERS ARE BEING DELETED FROM THE GDAS ANALYSIS PRESSURE GRIB FILES BECAUSE THEY ARE NOT VALID FOR THE ANALYSIS DATASET AND HAVE NEVER PROVIDED PERTINENT INFORMATION. THESE INCLUDE:

4 PRECIPITATION TYPES
CONVECTIVE PRECIPITATION RATE
LAND SEA MASK
LATENT HEAT FLUX
SENSIBLE HEAT FLUX
PRECIPITATION RATE
2M RH
2M SPECIFIC HUMIDITY
2M TEMPERATURE
BOUNDARY LAYER CLOUD COVER
LOW CLOUD COVER
CONVECTIVE CLOUD COVER
SKIN TEMPERATURE
SURFACE UPWARD LONG WAVE FLUX
SURFACE UPWARD SHORT WAVE FLUX HELICITY

THESE PARAMETERS ARE BEING DELETED FROM THE GLOBAL FORECAST MODEL SIMULATED GOES GRIB FILE BECAUSE THEY WERE INCLUDED IN ERROR. THESE FIELDS ARE AVAILABLE IN THE PGRB FILES:

MEAN SEA LEVEL PRESSURE
WAVE-5 GEOPOTENTIAL HEIGHT

ALL ACCUMULATED OR AVERAGED VALUES IN THE 192 HOUR PGRB AND FLUX FILES WILL NOW BE OVER A 6 HOUR PERIOD INSTEAD OF 12 HOURS. THE FORMAT AND CONTENT OF THE 3 HOURLY FILES FROM 180 TO 192 HOURS WILL BE THE SAME AS THE FILES FROM 0 TO 180. FOR THE FLUX FILE...THIS INCLUDES THE MAJORITY OF THE PARAMETERS IN THE FILE. PARAMETERS CHANGING IN THE PGRB FILE ARE:

2 M ABOVE GROUND MAX. TEMPERATURE
2 M ABOVE GROUND MIN. TEMPERATURE
SURFACE ALBEDO
SURFACE CLEAR SKY UV-B DOWNWARD SOLAR FLUX
SURFACE CATEGORICAL FREEZING RAIN
SURFACE CATEGORICAL ICE PELLETS
SURFACE CONVECTIVE PRECIPITATION RATE
SURFACE CATEGORICAL RAIN
SURFACE CATEGORICAL SNOW
ATMOSPHERIC COLUMN CLOUD WORK FUNCTION
SURFACE DOWNWARD LONG WAVE FLUX
SURFACE DOWNWARD SHORT WAVE FLUX
SURFACE UV-B DOWNWARD SOLAR FLUX
SURFACE GROUND HEAT FLUX
SURFACE LATENT HEAT FLUX
SURFACE PRECIPITATION RATE
LOW CLOUD BASE PRESSURE
LOW CLOUD TOP PRESSURE
MID-CLOUD BASE PRESSURE
MID-CLOUD TOP PRESSURE
HIGH CLOUD BASE PRESSURE
HIGH CLOUD TOP PRESSURE
SURFACE SENSIBLE HEAT FLUX
ATMOSPHERIC COLUMN TOTAL CLOUD COVER
BOUNDARY CLOUD LAYER TOTAL CLOUD COVER
LOW CLOUD COVER
MID-CLOUD COVER
HIGH CLOUD COVER
LOW CLOUD TOP TEMPERATURE
MID-CLOUD TOP TEMPERATURE
HIGH CLOUD TOP TEMPERATURE
SURFACE ZONAL GRAVITY WAVE STRESS
SURFACE ZONAL MOMENTUM FLUX
SURFACE UPWARD LONG WAVE FLUX
TOP OF ATMOSPHERE UPWARD LONG WAVE FLUX
SURFACE UPWARD SHORT WAVE FLUX
TOP OF ATMOSPHERE UPWARD SHORT WAVE FLUX
SURFACE MERIDIONAL GRAVITY WAVE STRESS
SURFACE MERIDIONAL MOMENTUM FLUX
SURFACE CONVECTIVE PRECIPITATION
SURFACE TOTAL PRECIPITATION
SURFACE LARGE SCALE PRECIPITATION
NOTE THAT FOR THE 192 HR PGRB PRODUCTS AVAILABLE ON NOAAPORT AND IN AWIPS... THE ACCUMULATIONS AND AVERAGES WILL REMAIN OVER THE PREVIOUS 12 HOUR PERIOD UNTIL AWIPS IS MODIFIED TO ACCOMMODATE THIS CHANGE.

ONE ADDITIONAL CHANGE TO NOTE IS THAT THE FILE PGRBF192.GRIB2 ON THE NCEP FTP SERVER WILL CHANGE FROM CONTAINING MODEL OUTPUT ON A 2.5 DEGREE GRID TO CONTAINING MODEL OUTPUT ON A 1 DEGREE GRID. THE 2.5 DEGREE OUTPUT WILL BE PROVIDED IN A NEW FILE WITH THE NAME PGRBF192.2P5DEG.GRIB2.

THE FORMAT OF THE HALF AND ONE DEGREE PRESSURE GRIB FILES WILL REMAIN THE SAME EXCEPT FOR THE CHANGES IN VARIABLES LISTED ABOVE. THE SIZE OF THESE FILES WILL NOT CHANGE SIGNIFICANTLY. WITH THE INCREASE IN MODEL RESOLUTION...THE SIZE OF THE SIGMA COEFFICIENT FILES AND THE SURFACE FLUX FILES WILL INCREASE SIGNIFICANTLY.

THESE CONTENT CHANGES WILL IMPACT ALL DISSEMINATION ROUTES: NWS PUBLIC FTP SERVER...THE NCEP PUBLIC FTP SERVER AND NOAAPORT.

A SET OF TEST DATA IS AVAILABLE /USE LOWERCASE/::
FTP://FTP.EMC.NCEP.NOAA.GOV/GC_WMB/WX24FY/GFS_T574L64/GFS.20091217/

A CONSISTENT PARALLEL FEED OF DATA IS AVAILABLE ON THE NCEP FTP SERVER AT THE FOLLOWING URL /USE LOWERCASE/:

FTP://FTP.NCEP.NOAA.GOV/PUB/DATA/NCCF/COM/GFS/PARA

DATA DELIVERY TIMING OF THE GFS WILL NOT BE IMPACTED BY THIS IMPLEMENTATION.

NCEP ENCOURAGES ALL USERS TO ENSURE THEIR DECODERS ARE FLEXIBLE AND ARE ABLE OF ADEQUATELY HANDLING CHANGES IN CONTENT... PARAMETER FIELDS CHANGING ORDER...CHANGES IN THE SCALING FACTOR COMPONENT WITHIN THE PRODUCT DEFINITION SECTION /PDS/ OF THE GRIB FILES AND ANY VOLUME CHANGES WHICH MAY OCCUR. THESE ELEMENTS MAY CHANGE WITH FUTURE NCEP MODEL IMPLEMENTATIONS. NCEP WILL MAKE EVERY ATTEMPT TO ALERT USERS TO THESE CHANGES PRIOR TO ANY IMPLEMENTATIONS.

IF YOU HAVE ANY QUESTIONS CONCERNING THESE CHANGES...PLEASE CONTACT:

JOHN H. WARD
NCEP...GLOBAL MODELING BRANCH
CAMP SPRINGS MARYLAND
PHONE: 301-763-8000 X7185
EMAIL: JOHN.WARD@NOAA.GOV
OR
SHRINIVAS MOORTHI
NCEP...GLOBAL MODELING BRANCH
CAMP SPRINGS MARYLAND
PHONE: 301-763-8000 X7233
EMAIL: SHRINIVAS.MOORTHI@NOAA.GOV

NWS NATIONAL TECHNICAL IMPLEMENTATION NOTICES ARE ONLINE AT:

HTTP://WWW.WEATHER.GOV/OS/NOTIF.HTM
$$ NNNN

Oct. 2009

Whats new


The new version of the WeatherOnline Expert Charts offers higher resolution charts, additional parameters and an easier to navigate menu.

We are keen to understand your preferences with regards to regions, models and parameters or combinations thereof. Please email us your comments/feedback.

Over the course of the next 4 weeks the old as well as the new versions will be available. Thereafter, only the new versions will be online.

Models:

The Canadian Model (CMC) as well as the GFS Model were upgraded to higher resolution versions (CMC: 0.6 degree, GFS: 0.5 degree). In addition WeatherOnline introduces ensemble runs of the CMC model, the Model of the Hydor Meteorological Center of Russia (RHMC) and a model to calculate visibility.

Charts:

The time interval displays have been increased. Additional parameters were introduced i.e. the wind charts and the cloud charts for different levels, the parameter visibility and additional indices such as convection and soaring. In numerous charts parameters are displayed using a combination of contour plots, isolines and numeric values.

The number of areas covered by the charts increased. For European charts are now available for Central Europe, Great Britain, France, Spain, Italy, Greece, Turkey, Poland and Russia. The worldwide coverage extends to Europe, Africa, North America, Central America, South America, Asia, Oceania, South Asia and Southeast Asia.

Another innovative feature are the spread plots showing the middle run as an isoline and the deviation from the middle run as contour plot (GEFS - Spread plots and CMC - Spread plots).

A new way of display was created for the Ensemble Time Series (GEFS TS) showing the average, the deviation from average as well as the respective minima and maxima.

Charts are availabe in three different resolutions 1000px, 634px. Eight chart panels are also available in 300px.

Menu:

A simpler menu allowing to proceed with subsequent links while keeping the preselected parameters, region and basis and time intervals.
In case a more current basis is available, a change in the 'basis' button color from green to red will indicate availability.
Time intervals can be chosen one at a time. Forecast times can be selected for days as well as for specific times - basis plus time interval. Time intervals over several days are indicated in different shades of grey. Charts with different time intervals can also be displayed as loops or in 24 hour steps.
Another new feature is the availability of the last 4 to 8 runs for all models.
A print version of the displayed chart is an available option.

Zooming in:

In order to show maximum information on small screens, a relatively small font size was selected in the default setting. Depending on the browser the options to increase the displayed text size are as listed below:

IE:
Go to 'view' and choose 'font size'

OPERA:
Use the 'zoom' function in the tool bar to adjust to the appropriate zoom level

Other browsers (Safari, Firefox, Netscape ...):
Most other browsers do offer to adjust the font size by using a combination of "Ctrl +/-" (Win) or "Command +/-" (Mac)

Member:

Current expert charts will remain and charts for the last month remain free of charge for all users. Premium Members can enjoy the charts free of advertising and will have access to our charts archives.