What happened to CFN website?

Cloud Free Night website re-design. Work in progress. Simple interface. No login required. All forecast maps and meteograms, and latest satellite and radar images available. Feedback info@cloudfreenight.com

What is available in CFN?

Australian ACCESS-C city (i.e. -VT, -SY, -BN, -DN, -PH, and -AD) hourly (+1 to +36 hours) model forecasts (1.5km resolution) updated 4 times/day (00, 06, 12 and 18 UTC) (Australia only); ACCESS-R regional 3-hourly (+3 to +72 hours) model forecasts (12km resolution) updated 4 times/day (00, 06, 12 and 18 UTC) (Australia and New Zealand); ACCESS-G global 3/6-hourly (+75 to +240 hours) model forecasts (25km resolution) updated 2 times/day (00 and 12 UTC); and United States GFS global 3/6-hourly (+3 to +240 hours) model forecasts (28km resolution) updated 4 times/day (00, 06, 12 and 18 UTC)

Hourly ACCESS-C (Day 1); 3-hourly ACCESS-R/ACCESS-G and GFS (Days 1-5); and 6-hourly ACCESS-G and GFS (Days 5-10) Total Cloud, Fog (ACCESS only), Low Cloud, Middle Cloud, High Cloud, Wind, Jetstream, Pressure/Rainfall, Temperature, Humidity forecast, Precipitable Water, Pressure/Evaporation (ACCESS only) and Solar Irradiance forecast maps

Victoria, New South Wales, Australian Capital Territory, SE Queensland, Northern Territory, SW Western Australia, South Australia, Tasmania, Melbourne, Sydney, Canberra, Brisbane, Darwin, Perth, Adelaide and Hobart ACCESS-C; and Australia, SE Australia, Victoria, New South Wales, Australian Capital Territory, SE Queensland, North Queensland, Far North Queensland, Northern Territory, Central Australia, NW Western Australia, SW Western Australia, South Australia, Tasmania and New Zealand ACCESS-R, ACCESS-G and GFS forecast map regions

Hourly (Day 1) ACCESS-C; 3-hourly (Days 1-3 and Days 3-5) ACCESS-R/ACCESS-G and GFS; and 6-hourly (Days 5-10) ACCESS-G and GFS forecast (Dark Sky, cloud and solar) meteograms (322 meteogram locations)

Himawari-8 satellite images updated every 10 minutes for Australia, SE Australia, Victoria, Melbourne, New South Wales, Sydney, Australian Capital Territory, Canberra, SE Queensland, Brisbane, North Queensland, Northern Territory, Darwin, Central Australia, NW Western Australia, SW Western Australia, Perth, South Australia, Adelaide, Tasmania, Hobart and New Zealand map regions

Radar images updated every 6 or 10 minutes for 64km, 128km, 256km and 512 km ranges (Australia only)

What is Map?

Map images show ACCESS or GFS hourly (3-hourly or 6-hourly) forecasts over specific regions for the next ten days. The maps display forecasts of total, low, middle and high cloud cover, fog, wind, jetstream, pressure, rainfall, temperature, humidity, precipitable water, evaporation and solar irradiance.

What is ACCESS model?

Australian Bureau of Meteorology Australian Community and Earth-System Simulator (ACCESS) models - ACCESS-C (city - 1.5km resolution: VT-Victoria/Tasmania, SY-Sydney, BN-Brisbane, PH-Perth, AD-Adelaide, DN-Darwin), with hourly forecast parameters out to 36 hours, updated 4 times per day (00, 06, 12, 18 UTC); ACCESS-R (regional - 12km resolution), with hourly forecast parameters out to 3 days (+72 hours), updated 4 times per day (00, 06, 12, 18 UTC); and ACCESS-G (global - 25km resolution), with three hourly forecast parameters out to 10 days (+240 hours), updated 2 times per day (00, 12 UTC), freely available (in real-time) for research use at Bureau of Meteorology OPeNDAP server.

When is ACCESS model data updated?

ACCESS-C 12 UTC (01:00-03:00)
ACCESS-R 12 UTC (01:00-02:30)
ACCESS-G 12 UTC (05:30-07:00)
ACCESS-C 18 UTC (07:00-09:00)
ACCESS-R 18 UTC (07:00-08:30)
ACCESS-C 00 UTC (13:00-15:00)
ACCESS-R 00 UTC (13:00-14:30)
ACCESS-G 00 UTC (17:30-19:00)
ACCESS-C 06 UTC (19:00-21:00)
ACCESS-R 06 UTC (19:00-20:30)
(Melbourne/Sydney local time)

What is GFS model?

United States National Center for Environmental Prediction (NCEP) Global (28km resolution) operational Forecast System (GFS) model with hourly forecast parameters out to 5 days (+120 hours) and 3-hourly forecast parameters out to 10 days (+240 hours), updated 4 times per day (00, 06, 12, 18 UTC), freely available (in real-time) for commercial use at NOMADS (NOAA Operational Model Archive and Distribution System).

When is GFS model data updated?

GFS 12 UTC (03:30-05:30)
GFS 18 UTC (09:30-11:30)
GFS 00 UTC (15:30-17:30)
GFS 06 UTC (21:30-23:30)
(Melbourne/Sydney local time)

What is Meteogram?

Meteogram images show a summary of ACCESS and/or GFS forecasts over the next ten days (Day 1, Days 1-3, Days 3-5 and Days 5-10) for particular locations. The meteograms (time-series graphs) present detailed cloud information or a summary comparison of the two models. The table displays hourly (3-hourly or 6-hourly) values of the temperature, rainfall, wind, pressure, humidity, evaporation, solar irradiance, fog and total, low, middle and high cloud cover.

What is Dark Sky?

Dark Sky images show, meteogram-style, ACCESS or GFS hourly, total cloud cover forecast and moon phase (% illumination), and moon/sun rise/set times for particular locations out to ten days, to identify dark sky night opportunities. Dark sky night hours are defined by cloud cover < 20% and moon illumination < 50% (or no moon), and are displayed using star icons near the top of the graph.

Where are VIC Meteogram locations?

Where are NSW Meteogram locations?

Where are ACT Meteogram locations?

Where are QLD Meteogram locations?

Where are NT Meteogram locations?

Where are WA Meteogram locations?

Where are SA Meteogram locations?

Where are TAS Meteogram locations?

Where are NZ Meteogram locations?

What is Satellite?

Satellite images originally processed by the Bureau of Meteorology from the geostationary satellite Himawari-8 operated by the Japan Meteorological Agency, updated every ten minutes, freely available (in real-time) for non-commercial use at Bureau of Meteorology FTP Server. The high-definition satellite images are conveniently matched to the forecast map regions.

Day + Night: True-colour images based on reflected visible light. These are useful, for example, for identifying fog and low cloud, which may not be visible in thermal infrared images because it has a similar temperature to the ground below. The visible light images only show parts of the Earth that are in daylight. Areas with no sunlight to reflect are replaced with greyscale thermal infrared imagery. To match the familiar colour of clouds, the infrared imagery colour table is inversed, which shows cloud as shades of white.

Visible Greyscale: Greyscale images based on one single visible wavelength (in comparison to the true colour image which combines three). These images will appear black in regions of no sunlight, i.e. night-time.

Infrared Greyscale: Infrared (IR) images are derived from radiation emitted from the Earth and its atmosphere at thermal-infrared wavelengths (10-12 um). These images provide information on the temperature of the underlying surface or cloud. IR images are available 24 hours per day because temperatures can always be measured. This is in contrast to visible images, which are only available during daylight hours. Temperatures are represented by a greyscale, where black and white represent the hottest and coldest areas respectively. As clouds tend to be cooler than the ground or sea below (not always the case for low-lying clouds), they appear as light grey to white.

Infrared + Zehr: Ray Zehr from the US National Oceanic and Atmospheric Administration developed the Zehr enhancement, which applies temperature colour ranges to the cold end of the scale. This highlights deep convection that is generally associated with tropical cyclones and thunderstorms. These images can be useful in tracking the movement of tropical cyclones.

Water Vapour: Colour-enhanced images showing a measure of the amount of water vapour contained in the mid to upper levels of the troposphere. These images can be used to determine moisture advection (horizontal transport from one region to another), vertical movement of air (rising and sinking or air) and synoptic features such as short wave troughs, ridges and jet streams. Colour-enhanced imagery helps to show how saturated an area is.

What is Radar?

Radar images from the Bureau of Meteorology public radar network, updated every six or ten minutes, freely available (in real time) for non-commercial use at Bureau of Meteorology FTP Server. The radar images are presented without location names using a modified colour palette for greater clarity.

How does the Cloud Free Night service operate?

The Cloud Free Night service is hosted on a leased (Binary Lane) Linux Virtual Private Server (VPS), with IDL® (Harris Geospatial Solutions) installed and licensed (esri Australia). IDL® applications are run automatically to download (using OPeNDAP) the GFS and ACCESS model forecast data and Bureau of Meteorology radar and Himawari-8 satellite images, to produce the forecast maps, meteograms, radar and satellite images available from this VPS-hosted website. IDL® is a registered trademark of Harris Geospatial Solutions for their Interactive Data Language software, used by astronomers worldwide. Esri Australia is the official local distributor of IDL®.

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