NWS Storm Review…April 4th, 2013 at 7:42 am by markmonstrola under Weather
Thanks to our friends over at the National Weather Service San Antonio/Austin for this review of the showers and thunderstorms we have seen over the past few days.
April 2-3, 2013, Severe Storms
Three separate shortwave troughs, a slow moving cold front, and unstable conditions due to moist Gulf air near
the surface combined to produce severe storms across South Central Texas on April 2 and 3, 2013. The first
shortwave trough destabilized the atmosphere in the vicinity of the cold front over the Hill Country around 2:00
pm CDT on April 2nd. The result was fast development of scattered thunderstorms, a few of which became
supercells and moved southeast. The strongest storm moved across southern Burnet County and into far
western Travis County, and produced baseball-size hail at the intersection of Texas Highway 71 and U.S.
Highway 281. These afternoon storms continued to move southeast and brought hail and heavy rain to the
coastal plains between Austin and Houston. The second shortwave trough combined with air being lifted up the
Sierra Madre mountains to produce a line of thunderstorms from the Big Bend south into Mexico by early
evening on April 2nd. These storms merged into a mesoscale convective system (or MCS) which then moved
across the entire area, bringing 1/2 to 2 inches of additional rain, small hail, and gusty winds to 45 mph during
the late evening and overnight hours. A third shortwave trough brought a final line of thunderstorms across the
area during the day on April 3rd, with additional reports of small hail, mainly in metro San Antonio.
Not only were there plenty of hail reports, but rainfall totals were impressive in many areas. Here are some storm totals from some of the LCRA’s reporting sites: