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<br />'" <br /> <br />3.2 Instrumentation and Types of Measurements <br />3.2.1 Surface <br />A network of 16 special surface stations will be set up in the <br />Texas HIPLEX area. Data from four additional stations will be obtained from <br />the National Weather Service or the Air Force. The locations of the <br />special surface stations and the NWS/Air Force stations are shown in <br />Fig. 3. 1.1. <br />The data to be collected at E=ach station will consist of approxi- <br />mately 10-min averages of wind speed, wind direction, temperature, relative <br />humidity, and pressure each hour on the hour every day during the field <br />program. Instrumentation at each of the special surface stations will <br />consist of a hygrothermograph for measuring temperature and relative <br />humidity, a microbarograph for measuring pressure, and an MRI automatic <br />weather station for measuring wind direction and speed and temperature. <br />A standard instrument shelter will house the instrumentation at each <br />station. Additional data of the same type will be obtained from the NWS <br />and Air Force stations although the types of instrumentation used may be <br />somewhat different. <br />Rainfall data will be collect:ed at 81 locations by fencepost gages <br />and at 81 locations with recording rain gages. The location of tlle fence- <br />post gages are shown in Fig. 3.2.1.1, and the location'of the recording <br />rain gages in Fig. 3.2.1.2. <br />3.2.2 ,Rawinsonde <br />Atmospheric soundings will be collected on a maximum of 16 days at <br />four locations on mesoscale operational days during the period JWle 1- <br />July 15, 1978. Soundings will be made at 3-hr intervals on these days <br />beginning at 1500 GMT (lOOO COT) and ending 0300 GMT (2200 CDT). An RD-65 <br />rawinsonde system will be used at Big Spring and a GMD-lb at Robert Lee <br />and Post, while soundings will be purchased from the National Weather <br />Service station at Midland. All sounding stations provide comparable data <br />although the tracking equipment is somewhat different. All stations will <br />use identical radiosondes. Special rawinsonde runs will be made as needed <br />at any of the sites, but these special runs will be made primarily at <br />Big Spring. <br />The raw data for each sounding will consist of baseline in-- <br />formation, azimuth and elevation angles obtained from tracking thl3 radio- <br />sonde, and a TMQ-5 chart containing ordinate values for temperatujre <br />and humidity for each pressure contact. All soundings made at Biq Spring <br /> <br />. <br /> <br />;; <br /> <br />5 <br />