The dryline is a well-defined atmospheric boundary observed over the southern Great Plains, between hot dry air to the west and air of maritime tropical (mT) origin to the east. Also shown are the least squares fits for the points with Δ θ υ < 0, and a theoretical dependence of density current speed on Δ θ υ for three values of density current depth D. Scatterplot of the dryline propagation speed relative to the ambient flow ( U rel) against Δ θ υ. Trend of the propagation speed of the dryline fineline. 9 but for the humidity difference, Δ q υ. The times of solar noon and sunset (both on 1 and 31 May) in Lubbock are indicated.Īs in Fig. The linear regression line is shown as well. Scatterplot of the difference in mixing ratio vs the difference in virtual potential temperature (moist side − dry side), between stations on opposite sides of the dryline, at any time before sunset. (a) Skew- T diagram and (b) hodograph for AMA (black lines) located 12 km west of the dryline, and MAF (gray lines), located farther south and ∼75 km east of the dryline, at 0000 UTC. The sea level pressure contours (2-hPa interval) are based on the North American Mesoscale (NAM) model initialization. The official analysis of the dryline and the outflow boundary is inaccurate, so these boundaries have been redrawn, based on additional surface station data, radar data, and soundings. The frontal analysis is the official version from the National Weather Service. The fineline in (a) and (b) is a westward-propagating outflow boundary, which had occluded the surface dryline around 2230 UTC. A north–south orientation is 0°.Īs in Fig. Histogram of local dryline orientations within the area of view of the LBB radar. The stations were located on the moist side of the boundary during the respective periods. 2) and (b) between 00 UTC (labeled as XSLS and XWVS in Fig. Saturation point analysis ( Betts 1984) for two WTM stations (a) between 20 UTC (labeled as XPTS and XRLS in Fig. The scale can be inferred from the range rings, shown at 40-km intervals. The station ID is shown below the station. The unconventional numbers, on the right of the station location, are the virtual potential temperature θ υ (K) and the mixing ratio q υ (g kg −1). The conventional parts of the station data are the wind barbs, the temperature T (☌), and the dewpoint T d (☌). The color field (with key bar on the left) is the 0.5° elevation base reflectivity (dB Z) from LBB. Stations used are Amarillo, TX (AMA) Dyess Air Force Base, TX (DYX) Frederick, OK (FDR) Lubbock, TX (LBB) Midland–Odessa, TX (MAF) and San Angelo, TX (SJT).Įxample of a dryline fineline and WTM station observations at 2340 UTC. The preferred longitude of drylines at 0000 UTC is based on the dryline climatology by Hoch and Markowski (2005). The gray circles, with a radius of 70 km, represent the typical clear-air coverage of the boundary layer. Creighton '89 and Dr.Map of WSR-88D radars and highways in West Texas. Hoffman '69 and Alexsis de Raadt-St James Fallen Graduates Memorial Scholarship Program.If you have any questions or for more information on the Lifetime Giving Societies, please contact Jenna Accomando, Senior Coordinator of Advancement Services, at or 845.446.1579. (Hap) Arnold $100,000 to $249,999ĭonors inducted into the Lifetime Giving Societies are invited to special Academy events, recognized in the Annual Report of Gifts, connected to a personal WPAOG liaison, receive exclusive access to Academy officials, and more. Members are recognized for their generosity with benefits determined by giving level. The generosity of these donors has been transformational for the Academy. The total of all gifts received by West Point or the Association during a donor’s lifetime determines membership in this giving society. The Lifetime Giving Societies are the premier recognition categories for the West Point Association of Graduates.
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