NWS Louisville Doppler Radar All Tilts Reflectivity

Tropical Storm Edouard Impacting the Northwestern Gulf Coast; Hazardous Heat expands in the East

Tropical Storm Edouard will impact the northwestern Gulf Coast through Wednesday with gusty winds, storm surge, and heavy rainfall. Flash and river flooding will be possible, especially in southeastern Texas. Hazardous heat will expand across the central and eastern U.S. by mid-week, and daily chances for severe thunderstorms are expected from the eastern Great Lakes to the Mid-Atlantic this week. Read More >

NWS Doppler Radar (WSR-88D) Example Products

With NWS Doppler radar, all elevation angles (tilts) within a particular volume scan can be viewed very quickly using the "All Tilts" product. For example, in volume coverage pattern (VCP) 212 (i.e., radar's antenna scan strategy), the radar scans 14 elevation angles in about 4 minutes. From the data, forecasters can quickly assess the full vertical structure of thunderstorms, such as storm height, deep high reflectivity cores, storm tilt which is related to vertical wind shear and storm type, and other information. It greatly assists the severe storm warning decision making process.

Above is All Tilts reflectivity data at 2014 UTC on March 2, 2012. Only every other tilt is shown (i.e., only 7 images instead of 14). The first (lowest) image at 0.5 degrees elevation shows numerous severe storms, while the last (highest) image at 19.5 degrees overshoots the top of most storms and shows only anvil debris near the radar. Storm tilt to the southeast with height is evident for two supercells over southern Indiana with a deep core of high reflectivity and hail aloft. In addition, the eastern supercell near the Scott-Clark County, IN line shows a bounded weak echo region (BWER) aloft (small area of lower reflectivity values), which denotes the location of the rotating updraft (mesocyclone) in the storm. This cell produced a strong tornado in Clark County.