Gaps in the National Radar Network

The network of WSR-88D radars installed from 1991 to 1996 is one of the great achievements of weather science and the National Weather Service, Federal Aviation Administration and Department of Defense deserve great credit for making it happen.

However, there are gaps in the network, one of which has been in the news recently. So, I thought it would be worthwhile to take a look at this topic.

Here is a map of the WSR-88D radar coverage:

This map does not include gap coverage from the FAA's Terminal Doppler Weather Radar. Outside of tornado alley, coverage 6,000 feet and below is adequate. How much would it cost to fill the most important gaps? Here are some rough figures:

• C-band radars, including a tower, cost about $600,000 each, far less than the NWS's primary radars. 
• I have picked the top twelve gaps to fill based on meteorological threat, population and comers. For example much of America's coal comes from Wyoming's Powder River Basin which has terrible coverage. The top 12 are circled below. 
• So, picking the top twelve sites would cost about $7,200,000 for the radars and towers. Round up to $10 million for up-front costs. Small by government standards.  

The gap northeast of Dallas (purple rectangle) may be filled by the north Texas CASA project. 

The U.S. Senate is considering the House's bill to provide additional funding for weather forecasting and weather research. Considering the small amount of money (by federal standards), this should be a priority for the additional funding.