view of the progression of the weather.

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2 Improve Youx Image Wh 'hen you want a clearer picture of the weather in your region, zoom in on Alden's new DlOO DIFAX display system. The D100 is a PC-based work station that lets you select any of the DIFAX charts available, automatically store them in memory, and call them up on a monitor. Best of all, the DlOO lets you store portions of these charts for detailed analysis of your own region. You zoom in on the exact area you need. The area selected is displayed at a much higher resolution rate for dramatically improved readability. Another unique feature is looping. For example, you can store sequential radar summaries, then loop through them-either automatically or manually-for a The full-frame weather depiction chart gives view of the progression of the weather. an overall view of the country's weather. Hard copies of any charts are available on Alden's dot matrix printer through an easy-to-use automatic or manual selection process. For more information on the DlOO, call or write Alden Electronics, 47 Washington Street, Westborough, MAoi58i.(6i7) Zooming in, you get a high-resolution display of your own region that's easier to work with. ALDENELECTRONICS

3 SMX TETHERED SYSTEMS HIGH-ACCURACY, PORTABLE ATMOSPHERIC SOUNDING A SYSTEMS A Total System Approach. AIR offers two completely portable Radiosonde Systems for highaccuracy measurement of atmospheric pressure, humidity, temperature, wind speed, and wind direction: (1) The AIR Free-Flight System, and (2) The AIR Tethered System. Both systems are significantly lower in price and operating costs than alternative systems. The ADAS Ground Station. An ADAS (Atmospheric Data Acquisition System) is the heart of each AIR sounding system. It receives and processes telemetered data from AIR's Airsondes and Tethersondes, calculates meteorological variables in real time, and produces digital output in meteorological units for computers or printers. When linked to an AIR Encoding Optical Theodolite, ADAS calculates wind in real time. Free-Flight Airsondes. Two types are available: the spinning Airsonde, with dry and wet bulb thermistors, and the ducted Airsonde, using a carbon hygristor for RH. Pressure is measured by a dual-diaphragm capacitance-type sensor. PTU data are telemetered every 5 seconds. Tethersondes. Rising 1-2km on a tethered balloon, the Tethersonde System measures PTU and winds with high vertical resolution in the boundary layer. ADAS GROUND STATION Find out more. For complete specifications and additional information about the advanced technology AIR Sounding Systems, call or write: Atmospheric Instrumentation Research, Inc Baseline Rd. A, Boulder, CO TWX: FAX: (303) Ext. 3 HEAVY DUTY WINCH

4 AEROVANE WIND EQUIPMENT Indicator and Recorders for the Aerovane Transmitter The Aerovane Indicator gives a constant visual indication of Wind Speed and Direction. The Aerovane and Belfort Recorders simultaneously record wind speed and direction in separate channels on a continuous paper chart. Call or write for a Catalog on our complete line of Meteorological Instruments. BELFORT INSTRUMENT COMPANY Office, Sales, and Factory 727 South Wolfe Street Baltimore, Maryland (301) Telex: (BELFORT BAL) Trahsjechnojogy CMMUrHM ( ^ M V

5 DM i!fee hmrfeai Mortal SOCKS Editor, Richard E. Hallgren Volume 69, Number 12, December 1988 articles The Changing Atmosphere Challenges and Opportunities 1434 Seasat: Results of the Mission R. H. Stewart 1441 Measuring the Performance of Data Validators N. Guttman et al meeting review DOE Model Intercomparison Workshop II W.J. Gutowski et al Technical Editor, Jack Kornfield correspondence Educational Affairs Editor, David D. Houghton Production Editor, Jean C. Thomas Geopotential Height Errors in NWS Rawinsonde Data at Denver C. G. Wade and S. L. Barnes 1455 Atews Editor, Brenda M. Gray Meetings Editor, Advertising, Evelyn Mazur Mary L. McMahon The BULLETIN OF THE AMERICAN METEOROLOG- ICAL 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 Richard E. Hallgren, Executive Director. Members are encouraged to send information to be considered for publication. Send four copies of each manuscript (text and illustrations). For guidance on preparation and style, see "Information for Contributors" on inside covers of a recent AMS research journal. special news features Anthes Named President of UCAR 1476 McPherson Named Deputy Director of National Weather Service 1476 Paine Editor of AMS Newsletter 1476 Simpson Appointed First Senior Goddard Fellow 1476 Summary of AMS Participation in the 1988 International Science and Engineering Affiliated Fairs June Bacon-Bercey 1483 program 24th Conference on Radar Meteorology of the American Meteorological Society 1491 AMS Officers and Councilors: President, Roscoe R. Braham, Jr.; President-Elect, Joanne Simpson; Executive Director, Richard E. Hallgren; Past Presidents, Albert J. Kaehn, Jr. and Joseph Smagorinsky; and Councilors, Richard A. Anthes, D. James Baker, Jr., William D. Bonner, John J. Cahir, Robert A. Duce, Peter S. Eagleson, Russell L. Elsberry, Elbert W. Friday, Jr., Thomas B. McKee, Ian D. Rutherford, Pamela L. Stephens, Douglas H. Sargeant, William L. Smith, Paul D. Try, and Warren M. Washington. The BULLETIN OF THE AMERICAN METE- OROLOGICAL SOCIETY (ISSN ) is published monthly by the American Meteorological Society at 45 Beacon St., Boston, MA Second-class postage paid at Boston, MA, and at additional mailing offices. Subscription price to members is included in annual dues ($30 per year). Subscription price to nonmembers is available on request; single issues are $15 each. Address all business communications, purchase orders, and inquiries to the Executive Director, American Meteorological Society, 45 Beacon St., Boston, MA ( ). POSTMASTER: Send address changes to BULLETIN OF THE AMERICAN ME- TEOROLOGICAL SOCIETY, 45 Beacon St., Boston, MA announcements 1452 letter to the editor 1459 AMS announces undergraduate awards and scholarships 1460 nomination submissions 1461 book review years ago 1470 new publications 1473 news and notes years ago about our members news from our chapters.. calendar of meetings corporation members professional directory lists of new members contents of AMS journals index to 1988 index to advertisers Cover: A three-channel image taken on 1 September 1985 from the Geostationary Operational Environmental Satellite, showing Hurricane Elena off the Florida Panhandle. Colors indicate moisture gradations in the atmosphere as well as the height of clouds, a technique developed at NASA Goddard Space Flight Center by A. F. Hasler and Hal Pierce. White shows the central hurricane, tropical cloud clusters, and thunderstorm tops. Subtropical highs and the region just north of the hurricane appear pink. (Photo courtesy of NASA Goddard Space Flight Center.) Copyright 1988, American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this journal in scientific and educational work is hereby granted provided that the source is acknowledged. Any use of material in this journal that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L ) does not require the Society's permission. Items that do not bear their own separate copyright notices either are in the public domain or are U.S. Government works for which copyright protection is not available. Authorization to photocopy items bearing individual AMS copyright notices at the bottom of their first page is granted by AMS for libraries and other users registered with the Copyright Clearance Center (CCC) Transactional Reporting Service, provided that the copies are for internal or personal use, or for the internal or personal use of specific clients, and further provided that the base of $4.25 per copy plus $0.25 per page is paid directly to CCC, 21 Congress St., Salem, MA 01970, and that the following fee code for this journal is reported with the payment to CCC: /83 $ Republication, systematic reproduction, and other uses of any material in this journal, unless exempted by the above statements, require written permission or license from the AMS.