Wednesday, April 22, 2015

South Texas Severe Weather Events - April 12-14th, 2015

http://www.srh.noaa.gov/crp/?n=severe_april12-14_2015

A strong subtropical jet stream along with embedded upper level disturbances persisted across South Texas and Mexico between April 12th through April 14th, 2015. Meanwhile, abundant moisture and a very unstable airmass interacted with the strong jet stream and several upper level disturbances to produce 3 separate rounds of severe weather across South Texas during this time period.
The first event began in the late evening on April 12th and continued through the early morning hours on April 13th. This event began with moisture increasing across South Texas. Surface temperatures were warm in the low to mid 80s, while mid and upper levels of the atmosphere were cooler than normal, which led to a very unstable environment. As an upper level disturbance moved across Mexico toward South Texas, storms developed along the Sierra Madre in Mexico. These storms organized into a squall line as they entered South Texas. Wind gusts of 30 to 50 mph with isolated 60 mph wind gusts occurred along and behind this squall line. Isolated wind damage and localized flooding did occur with this squall line. The squall line eventually pushed offshore and weakened in the early morning hours on the 13th.

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