A series of gravity waves propagating ahead of an early-season cold front pushed through the Texas South Plains during the morning hours of August 20th, 2009. Another series of gravity waves pushed south and southwest away from a thunderstorm complex in Oklahoma after sunrise on the 20th. Both sets of waves merged near the Caprock Escarpment later in the morning on August 20th, 2009. Very few clouds developed on the waves with only a series of ripples in WTM wind and pressure data.

Lubbock WSR-88D base reflectivity loop from 5:00-11:00 am CDT on August 20th, 2009.

KLBB ASOS one-minute station pressure plot for 11-18 UTC (5 am to 12 pm) on August 20th, 2009 showing waves passing over the Lubbock airport. Data Credit: Steve Cobb, NWS Lubbock.

WTM Reese Center boundary-layer profiler data on August 20th, 2009 showing low-level jet ahead of gravity waves and cold front.

Meteogram plots for several WTM stations showing the different wave trains. The waves show up best as minor ripples in the wind and station pressure plots Click on thumbnail for full-sized image.

Anton 6SSW meteogram plot. Click on thumbnail for full-sized image.

Floydada 2NNE meteogram plot. Click on thumbnail for full-sized image.

Lubbock 3WNW meteogram plot. Click on thumbnail for full-sized image.

Reese Center(12W of Lubbock) meteogram plot. Click on thumbnail for full-sized image.

Wolfforth 6SSW meteogram plot. Click on thumbnail for full-sized image.

Roaring Springs 3N meteogram plot. Click on thumbnail for full-sized image.