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, ' . .• <br /> ',. 6/24/75 AC 150/5300-4B , <br /> .,1 ..,_ Appendix 3 • <br /> .. , . !1' <br /> :,s." •i"I <br /> . ,.., <br /> APPENDIX 3. WEATHER DATA SOURCE AND ANALYSIS <br /> 4 , r <br /> -.. , <br /> L. / PROCEDURE. When an airport is needed in a particular locale, one of <br /> ..:= . the first steps the airport designer must take is to analyze recorded <br /> ;',.(... / <br /> . , . wind Oils; .tions for the location. IXisting National Oceanic and <br /> :--, Atmospiheric Administration. NOAA publications should be researched to 1, <br /> determine if a satisfactory wind data summary has been published. <br /> Assisance can be obtained from any NOAA Weather Bureau Office or from ft <br /> k....the NOAA State Climatologist. oftho,, ----rb.ravaiale, the 10-year <br /> ____----------- ..- <br /> summariy (Climatography o the United States, Series No. 82, Summary of A! <br /> . , <br /> RaUiTTObse - " .. - is the most useful iz airport planning sign <br /> :?..4 i q <br /> si e !it gives the best indication 7Eir expected wind conditioa—it—a i .1 <br /> • g. -Ire-tris-i-t-e5-- e most comp TEE—TETZITraftUfi—regarding the availability <br /> of ;:iiiid—ffEta, can be obtained by contacting the National Weather Records 1 r <br /> Center, Environmental Data Service, Federal Building, Asheville, <br /> North Carolina 28801. <br /> 1ft ; <br /> lz A , <br /> a. Where wind data for a specific location are not available, the data II/ <br /> -: - ;;.. , <br /> ,;... from two or more of the nearest recording stations should be ex- <br /> writhed. It must be kept in mind that terrain (lakes, river basins, !!' <br /> and hills) surrounding a site can considerably influence the wind <br /> diFection and speed. The advice of a meteorological consultant <br /> should be sought in selecting these surrounding stations. <br /> ...; <br /> = b Ifl a 10-year summary cannot be obtained, then some lesser period .; <br /> tions should be considered as the minimum upon which runway <br /> of; record can be used; hawever, 3 years of record of hourly observa- <br /> orientation is based. This recommendation is made as a result of a <br /> ; <br /> study of wind records across the country, which showed that a <br /> significant difference can exist between the wind coverages obtained <br /> frOm a 10-year summary and from a 3-year summary. <br /> I <br /> : 'f• <br /> ! i ' <br /> f <br /> :11 <br /> 11 <br /> 'ff <br /> I ! <br /> C. Where no recorded data are available either for the specific i <br /> Incation or from recording stations near enough to be significant, <br /> an evaluation should be made of the best local information. If <br /> IoCal information does not firmly establish a wind pattern, it is <br /> desirable to collect wind data at the site. Data collected for a <br /> period of even 1 year can be useful in conjunction with local II <br /> information in the determination of runway orientation. However, HI <br /> 1 <br /> great care must be taken not to allow such Limited data to over- <br /> 1 <br /> . ride other influencing factors. Where only 1 year of wind data : 1 <br /> is' available and local judgment is the basis on which orientation <br /> is determined, only one runway should be constructed until at Least <br /> 3 years of observational data can be obtained. <br /> I . <br /> I <br /> d Figure 1 is an example of an NOAA Environmental Data Service tabula- 1 <br /> tion of wind direction versus wind speed. When the summary to be <br /> 1 i' <br /> used in the wind analysis has been obtained, transfer the appro- <br /> priate data expressed in percentage to the wind rose diagram. ' <br /> Figure 2 is an explanation of the format and its related codes. <br /> , <br /> Par 1 Page 1 . <br />