a new, better w a y to measure it

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2 11I a new, better w a y to measure it The Model 207 Forward Scatter Meter, developed by EG&G, utilizes an entirely new technique for measuring visibility. Extensive tests in airport and highway installations indicate that this compact, relatively lowcost instrument offers significant advantages. A report recently issued by an independent research laboratory contains.. convincing evidence that the forward scatter visibility meter represents a major advance in the measure of visibility. In overall range and stability it is superior to the transmissometer, and it has obvious advantages over the human observer." The Model 207 is ideal for use by: weather stations airports Coast Guard meteorological researchers highway authorities nuclear plant siting engineers others requiring accurate definitive visibility data Designed for mounting on a single post, the instrument has a source-todetector path of only four feet. Compact, rugged electronics and optics provide stable, reliable operation under the most hostile meteorological conditions. Send today for complete data on the new Model 207 Forward Scatter Visibility Meter EQUIPMENT DIVISION 151 Bear Hill Road Waltham, Mass (617)

3 Stationary Meteorological Satellite (SMS 1 & 2) Photos now available on National Forecast Office Facsimile Circuit (FOFAX) SMS satellite pictures are now on the FOFAX Network. You can receive these new and detailed pictures plus the other forecast charts with our ALDEN 1800 auto select Facsimile Recorder. Infrared and visible SMS pictures covering both Eastern and Western portions of the United States are transmitted throughout the day. The received ALDEN 1800 pictures are large inches wide by transmitted length and contain up to 16 sepia tone shades of useful discernible information. To learn more, fill out the coupon. For a quick answer to your questions call the ALDEN Sales Department at 617/ LDEN ELECTRONIC & IMPULSE RECORDING EQUIPMENT CO.. INC.. WASHINGTON ST., W E S T B 0 R 0, MASS TELEPHONE: (617) TELEX: Please send complete data on the ALDEN 1800 auto select Facsimile Recorders for receiving SMS pictures on FOFAX. Please send complete data on other ALDEN weather map recording systems: ALDEN 600 and 1100 WeatheRadar Recorders. ALDEN 1100 and 1800 Facsimile Recorders for the NAFAX Circuit. ALDEN 1100 and 1800 auto select Facsimile Recorders for the NAMFAX Circuit. Call me at Name_ Affiliation. Address _ City _ -Zip_ ALDEN...THE FIRST NAME IN FACSIMILE WEATHER CHART RECORDERS.

4 VIRON MENTAL NITORING Thermal m dimati < == It's what's happening. Meteorological data. Oceanographic information. Power plant site studies. We're Bendix. And we offer a total environmental monitoring capability. Sensors. Indicators. Recorders. Interfacing. Signal conditioning. Automatic scanning. Data collection. Permanent records. Data processing. We can provide it all. And all with an eye toward satisfying.epa regulations and AEC safety guide 23 (Regulatory Guide 23). We'll custom design and build equipment to meet your needs. You get Bendix instruments with quality, accuracy and dependability built right in. If you need to know precisely what's happening around you, contact: The Bendix Corporation, Environmental Science Division, 1400 Taylor Avenue, Baltimore, Maryland Telephone: _ Bendix^

5 The BULLETIN OF THE AMERICAN METEOROLOGICAL SOCIETY is the official organ of the Society, devoted to editorials, survey articles, professional and membership news, announcements, and Society activities. Editing and publishing are under the direction of Kenneth C. Spengler, Executive Director. Members are encouraged to send to the Society information which they wish to be considered for publication. Four copies of each manuscript (text $nd illustrations) are required. For guidance on preparation and style, see Information for Contributors on inside covers of a recent issue of any AMS research journal. AMS Officers and Councilors: President, David Atlas; President-Elect, Charles L. Hosier; Executive Secretary, Kenneth C. Spengler; Secretary- Treasurer, David F. Landrigan; Past Presidents, William W. Kellogg and David S. Johnson; and Councilors: Pauline M. Austin, William H. Best, Jr., Stanley A. Changnon, Jr., Edward S. Epstein, Robert G. Fleagle, Neil L. Frank, Paul W. Kadlec, William H. Klein, Richard S. Lindzen, Jerome Namias, Allen D. Pearson, Robert 0. Reid, Joanne Simpson, Joseph Smagorinsky, David K. Todd. Editor Kenneth C. Spengler Technical Editor James E. Caskey, Jr. News Editor Mari Okie Copy Editor Mary F. Buckley Meetings Editor Evelyn Mazur Assistant Meetings Editor Twila A. Bombard volume 56, number 9, September 1975 Published monthly by the American Meteorological Society at 45 Beacon Street, Boston, Massachusetts Second-class postage paid at Boston, Mass. and at additional mailing offices. Address all business communications, purchase orders and inquiries regarding the Society to the Executive Director, American Meteorological Society, 45 Beacon Street, Boston, Mass Cover photograph: The NCAR Boundary Profile System. Shown in the picture are the small plastic aerodynamically shaped balloon, an airborne package suspended below the balloon, a tether line, and a winch for controlling the tether. (See article by Morris, Call, and McBeth, p. 964.) articles a small tethered balloon sounding 964 A. L. Morris, D. B. Call system and R. B. McBeth operations of mesoscale networks, illustrated by METROMEX an early look at the development of an unmanned automated surface aviation weather observation system 971 S. A. Changnon, Jr. 979 E. Mandel GARP topics the GATE dropwindsonde program 984 R. H. Simpson, P. K. Govind and R. Holle conference summaries programs third symposium on meteorological observations and instrumentation first meeting on the outdoor facility for cloud and fog research seventh international laser radar conference first conference on parameterization in meteorology conference on meteorology over the Gulf of Mexico 989 J. Giraytys 991 M. N. Plooster announcements 977 news and notes 1008 corrigendum 992 calendar of meetings 1017 book reviews 994 tables of contents for AMS journals 1026 about our members necrology at AMS headquarters announcement of AMS undergraduate awards and scholarships corporation members professional directory news from our chapters 1005 index to advertisers