In-cockpit Next Generation Radar (NEXRAD)Mosaic Imagery, a product of the National Weather Service, flight information service-broadcast providers and private satellite weather service providers, displays radar images that may contain data that is 5-20 minutes old.
The National Transportation Safety Board (NTSB) released a statement on June 20, 2012 that the delay of weather information provided to private pilots by the NEXRAD mosaic image could prevent the pilots from accurately judging the weather conditions they may encounter.
Multiple ground radar sites are used to provide data for the NEXRAD mosaic image.
The NEXRAD image delay is caused by the time it takes to deliver the NEXRAD data from the ground to the service provider. After the service provider has access to the data, more time is lost during the process of combining radar images into the mosaic to be displayed in the cockpit.
NEXRAD image data of that is 15-20 minutes old is not considered typical, however, the NEXRAD mosaic image will always be older than the age indicated on the display.
In the press release the NTSB urges pilots to, "remember that the in-cockpit NEXRAD display depicts where the weather WAS, not where it IS."
Pilots who are relying on outdated weather images may not be prepared for rapidly changing weather they may encounter.
The most important thing pilots can do before their flight is to get a preflight weather briefing. Pilots should know what weather events are predicted along their flight path.
Once they have weather information from all available sources, pilots can make better decisions before taking off.
Chicago will not catch a break from the bitter cold anytime soon, as more cold air heads to the city this week.
It has rained every day so far this month, except Dec. 1 around Atlanta. That trend will continue through Tuesday.
More waves of Arctic air are in the offing for Detroit this week.
After ending the weekend on a slick note, more cold air will dominate weather headlines this week.
Philadelphia International Airport received more snow (8.6 inches) from a single storm this past Sunday than it did all of last winter, when 8.3 inches fell.
While many may dream of a white Christmas, the reality of one may not be favorable, depending on one's geographical location during the holidays.
Bend, OR (1919)
28" snowfall set state 24 hour mark.
Baltimore City (1878)
28.73" barometric pressure - Dec. record.
Western New York (1995)
Heavy lake-effect snow brought 37.9" of snow to the Buffalo airport in 24 hours. This broke the old 24-hour record of 25.3" set in January 10-11, 1982. Other months included: Buffalo (Delaware Park) 33" Buffalo (Allentown) 33" Williamsville 32" Clarence 31" North Buffalo 27"