|
Aquila Systems, Inc. |
Although the instructions are lengthy it is important to read them and refer to them as necessary to use Where's It Cloudy most effectively. If you would prefer to read these on a larger screen (in a web browser) visit www.aquilasys.com and click on "Where's It Cloudy Usage". Where's It Cloudy allows, as the name implies, the user to see in great detail where it is cloudy anywhere in the Eastern two thirds of the United States and Southeast Canada and Northeast Mexico. In addition it allows users to see where it is likely raining and monitor the formation of thunderstorm cells. During Hurricane season you can see in vivid detail Hurricanes as they approach the Eastern sea board. Many Weather applications and web sites allow you to view radar data which is great to show you where it is raining as that is what radar detects but radar is not capable of "seeing" where the clouds are. Although knowing where it is raining is important where it is cloudy can be very important in planning activities that are best done when the sun is shining. When a warm front is passing the large area of clouds can lead to rain at any time as a result knowing when it will get cloudy can allow you to plan on when the risk of periodic rain showers is likely. The image data comes directly from the U.S. GOES satellite launched by NASA and operated by NOAA. As we get the imagery directly from the imaging satellite the latency from when the U.S. is imaged to when we make the images available to you is a matter of minutes versus twenty minutes to an hour for imagery that is processed through most weather services. Where's It Cloudy allows you zoom it to the maximum detail available in the satellite imagery and select the data you wish to view by making simple selections. The Where's It Cloudy "cloud server", pun intended, renders the data you requested at the resolution you selected and the image size that matches your phone. So you are not just getting a predefined regional view at a predefined and typically course resolution. You are getting a loop of images specifically created to match your selections and device. Looking at the high resolution Visible channel imagery during the day is the most effective way to see where it is currently cloudy. In most cases you will request Where's it Cloudy to produce a series of time lapse images covering the past hour or more in this way you can see the approximate speed and direction that the clouds are moving. The Visible channel is not available at night as the satellite needs sun light to see in the Visible channel this is usually not an issue as where it cloudy or not logistically makes the most difference during the day. If you select the Visible channel at night it will say that "No Satellite Images are Available That Meet Request". You can select the Infrared channel to see clouds that are in the upper atmosphere at night. The Infrared channels is essentially seeing "temperatures" so it works all the time. This will not show you where it is cloudy as effectively as the visible channel as many clouds are too low in the atmosphere to be detected in this channel. However the clouds it does show are higher in the atmosphere and are more likely to produce rain. In the Infrared channel you can select a number of colorized enhancements that show where the colder temperatures are and therefore the clouds that are higher in the atmosphere. The Infrared channel can effectively show the development of convective systems (thunderstorm cells) and when you begin to see a peaking of this development and it starting too diminish this is a strong indication that the convective cell is producing a thunderstorm. The larger the cell and the colder it gets the more likely it is to be a severe thunderstorm with high winds and hail. Other valuable spectral channels and derived information are available to users who donate to Aquila Systems. See our web site for more details on this and other advantages of donating. You can vividly see hurricanes and even their rotation by simply getting the latitude and longitude from any of a number of web sites that track hurricanes and putting this location into Where's It Cloudy. The Visible channel properly zoomed can make for a vivid picture of the hurricane and the Infrared channel can show you where the bulk of the rain producing areas are. As we generate each loop (series of images) based on your setting it takes some time (a few seconds to do this) as we are creating high quality imagery it takes several seconds to download even over 3G or WiFi to entertain you while you wait for the imagery we cycle through short random loop of our corporate sponsor's so you can appreciate who is providing the funding to bring you this capability. As soon as the image loop has been downloaded we begin to show it typically 5-15 seconds over WiFi or 3G but it could be much longer during periods of heavy load or less than 3G connectivity. We provide an approximate countdown timer that is based on 3G or WiFi connectivity. Using Where's It Cloudy Usage is simple when the application is started you can choose either a Location or a View ultimately you may want to do both. Location is most important as by default the View will be the Visible channel with minimal overlay annotation. Press menu and select "Location" to bring up the location selection box. You have three options to select the location that will be the center of the image. The first is to simply choose your current location by pressing "Use Current Location". The next option is to pick a state and city. The last option is to select or enter a latitude and longitude. Note that if you pick a location not covered by satellite imagery you will not get any images. Typically latitudes between 20-60 degrees North and longitudes between 60-120 degrees West will produce results. The final element to select is the altitude you are viewing the Earth from. If you want to see most of the hemisphere pick 5000 miles, if you want to see most of the country pick 2000 miles, if you want to see your region of the country pick 500 miles, and if you want to see your area in great detail choose 100-200 miles. To select a View of the same location and altitude select "View" from the menu. You can then select the image channel or type, the colorization and enhancement, and a number of annotations that can alter or appear on top of the satellite image. The two image types you can select between are Visible and Infrared the meaning and differences of which have been discussed above. For each type you can choose an enhancement for visible there are only two one of which shows it as the satellite sees it and one which brightens clouds and enhances land detail. For the Infrared channel there are a number of enhancements that use a different color palette to represent the temperatures. You can select a number of images to have in your loop or time lapse animation. More images can give a better idea of storm development and movement but will take longer to load. Users who donate can select to have up to 30 images in their loop. You may not always get the number you select if some of the most recent images do not meet the criteria an example is selecting Visible imagery just after dark. The annotation options are selected by checking the desired annotations as follows: City Mode- Major and some minor cities can be displayed by selecting the appropriate city mode each step is progressive so Minor + Label shows major and minor cities with labels. The labels are a two letter code we choose that should make the city obvious to people who know the area. These same cities are available in the location selection so in case you are wondering what lat/lon we call the "city center" select it in the location dialog. Tru Sat Image - When checked shows the True satellite image enhanced as selected versus only showing the clouds with a rendered underlay. This can be used to show land detail in the Visible channel and relative surface temperatures in the Infrared channel. Calibration Key - When Checked includes a key in the upper left corner of the display that allows you to correlate shades or colors to temperatures in degrees Celsius for those not Met savy get you conversion chart out. The calibration key is most effectively used by rotating your phone into landscape mode. Range Rings - When checked displays a series of three rings surrounding the selected center location. If the altitude is 500 miles or less these range rings show 25, 50, and 75 miles. If the altitude is greater than 500 miles then the range rings show 100, 200, and 300 miles from the center. City Rings - When checked every city that is displayed as a red dot will have two range rings surrounding it that are 10 miles and 25 miles away from the city. Borders - This is checked by default and displays geographic and political borders down to the state level. If you uncheck this the borders are not shown. This is seldom done except for artistic purposes. |
Weather Satellite Systems In Support of Operational Meteorology and Education |