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Weather and Snow Observations for Avalanche Forcasting: an Evaluation of Errors in Measurement and Interpretation
143 WEATHER AND SNOW OBSERVATIONS FOR AVALANCHE FORCASTING: AN EVALUATION OF ERRORS IN MEASUREMENT AND INTERPRETATION R.T. Marriottl and M.B. Moorel Abstract.--Measurements of weather and snow parameters for snow stability forecasting may frequently contain false or misleading information. Such error~ can be attributed primarily to poor selection of the measuring sites and to inconsistent response of the sensors to changing weather conditions. These problems are examined in detail and some remedies are suggested. INTRODUCTION SOURCES OF ERROR A basic premise of snow stability analysis for Errors which arise in instrumented snow and avalanche forecasting is that point measurements of weather measurements can be broken into two, if snow and weather parameters can be used to infer the somewhat overlapping, parts: those associated with snow and weather conditions over a large area. Due the representativeness of the site where the to the complexity of this process in the mountain measurements are to be taken, and those associated environment, this "extrapolation" of data has with the response of the instrument to its largely been accomplished subjectively by an environment. individual experienced with the area in question. This experience was usually gained by visiting the The first source of error is associated with areas of concern, during many differing types of the site chosen for measurements. The topography of conditions, allowing a qualitative correlation mountains results in dramatic variations in between the measured point data and variations in conditions over short distances and often times the snow and weather conditions over the area. these variations are not easily predictable. For example, temperature, which may often be In many instances today, the forecast area has extrapolated to other elevations using approximate expanded, largely due to increased putlic use of lapse rates, may on some occasions be complicated by avalanche-prone terrain (e.g. -
Retrieving Wind Speed and Direction from WSR-88D Single- Doppler Measurements of Thunderstorm Winds
6th American Association for Wind Engineering Workshop (online) Clemson University, Clemson, SC, USA May 12-14, 2021 Retrieving wind speed and direction from WSR-88D single- Doppler measurements of thunderstorm winds Ibrahim Ibrahima,*, Gregory A. Kopp b, David M. L. Sills c a Northern Tornadoes Project (Western University), London, ON, Canada, [email protected] b Northern Tornadoes Project (Western University), London, ON, Canada, [email protected] c Northern Tornadoes Project (Western University), London, ON, Canada, [email protected] ABSTRACT: The evaluation of wind load values is dependent on the historical wind speeds recorded by field measurements, mainly anemometers. Such one-point measurement procedure is sufficient for dealing with structures of smaller scales. Nevertheless, special structures like long-span bridges and electricity transmission lines need a more comprehensive procedure, especially for regions prone to extreme wind events of limited size like thunderstorms. These events are less probable to be picked up by one-point measurements. Accordingly, the current study explores the use of Doppler weather radar measurements to estimate wind speeds associated with thunderstorm weather systems. The study estimates localized wind speeds down to the scale of hundreds of meters by implementing an algorithm to separate different weather systems within each radar scan and resolving them separately. The estimated peak event wind speeds are compared with ASOS anemometer measurements for comparison. Keywords: Doppler Radar, Wind Retrieval, NEXRAD, Non-synoptic Wind 1. BACKGROUND Providing loading guidelines for the design of safe structures is one of the main concerns of Wind Engineering. Extreme value analysis is performed on a set of historical wind speed anemometer recordings. -
Meteorological Monitoring Guidance for Regulatory Modeling Applications
United States Office of Air Quality EPA-454/R-99-005 Environmental Protection Planning and Standards Agency Research Triangle Park, NC 27711 February 2000 Air EPA Meteorological Monitoring Guidance for Regulatory Modeling Applications Air Q of ua ice li ff ty O Clean Air Pla s nn ard in nd g and Sta EPA-454/R-99-005 Meteorological Monitoring Guidance for Regulatory Modeling Applications U.S. ENVIRONMENTAL PROTECTION AGENCY Office of Air and Radiation Office of Air Quality Planning and Standards Research Triangle Park, NC 27711 February 2000 DISCLAIMER This report has been reviewed by the U.S. Environmental Protection Agency (EPA) and has been approved for publication as an EPA document. Any mention of trade names or commercial products does not constitute endorsement or recommendation for use. ii PREFACE This document updates the June 1987 EPA document, "On-Site Meteorological Program Guidance for Regulatory Modeling Applications", EPA-450/4-87-013. The most significant change is the replacement of Section 9 with more comprehensive guidance on remote sensing and conventional radiosonde technologies for use in upper-air meteorological monitoring; previously this section provided guidance on the use of sodar technology. The other significant change is the addition to Section 8 (Quality Assurance) of material covering data validation for upper-air meteorological measurements. These changes incorporate guidance developed during the workshop on upper-air meteorological monitoring in July 1998. Editorial changes include the deletion of the “on-site” qualifier from the title and its selective replacement in the text with “site specific”; this provides consistency with recent changes in Appendix W to 40 CFR Part 51. -
Snow Accumulation Algorithm for the Wsr-88D Radar: Supplemental Report
R-99-11 SNOW ACCUMULATION ALGORITHM FOR THE WSR-88D RADAR: SUPPLEMENTAL REPORT November 1999 U.S. DEPARTMENT OF THE INTERIOR Bureau of Reclamation Technical Service Center Civil Engineering Services Materials Engineering and Research Laboratory Denver, Colorado R-99-11 SNOW ACCUMULATION ALGORITHM FOR THE WSR-88D RADAR: SUPPLEMENTAL REPORT by Edmond W. Holroyd, III Technical Service Center Civil Engineering Services Materials Engineering and Research Laboratory Denver, Colorado November 1999 UNITED STATES DEPARTMENT OF THE INTERIOR ò BUREAU OF RECLAMATION ACKNOWLEDGMENTS This work extends previous efforts that were supported primarily by the WSR-88D (Weather Surveillance Radar - 1988 Doppler) OSF (Operational Support Facility) and the NEXRAD (Next Generation Weather Radar) Program. Significant additional support was provided by the Bureau of Reclamation’s Research and Technology Transfer Program, directed by Dr. Stanley Ponce, and by the NOAA (National Oceanic and Atmospheric Administration) Office of Global Programs GEWEX (Global Energy and Water Cycle Experiment) GCIP (Continental-Scale International Project ), directed by Dr. Rick Lawford. Most of the work for this supplemental report was performed and coordinated by Dr. Arlin B. Super, since retired. Programming and data support was provided by Ra Aman, Linda Rogers, and Anne Reynolds. In additional, we had useful feedback from several NWS (National Weather Service) personnel. Reviewer comments by Curt Hartzell and Mark Fresch were very helpful. U.S. Department of the Interior Mission Statement The Mission of the Department of the Interior is to protect and provide access to our Nation’s natural and cultural heritage and honor our trust responsibilities to tribes. Bureau of Reclamation Mission Statement The mission of the Bureau of Reclamation is to manage, develop, and protect water and related resources in an environmentally and economically sound manner in the interest of the American public. -
Vol.37 No.6 D'océanographie
ISSN 1195-8898 . CMOS Canadian Meteorological BULLETIN and Oceanographic Society SCMO La Société canadienne de météorologie et December / décembre 2009 Vol.37 No.6 d'océanographie Le réseau des stations automatiques pour les Olympiques ....from the President’s Desk Volume 37 No.6 December 2009 — décembre 2009 Friends and colleagues: Inside / En Bref In late October I presented the CMOS from the President’s desk Brief to the House of Allocution du président Commons Standing by/par Bill Crawford page 177 Committee on Finance at its public hearing in Cover page description Winnipeg. (The full text Description de la page couverture page 178 of this brief was published in our Highlights of Recent CMOS Meetings page 179 October Bulletin). Ron Correspondence / Correspondance page 179 Stewart accompanied me in this presentation. Articles He is a past president of CMOS and Head of the The Notoriously Unpredictable Monsoon Department of by Madhav Khandekar page 181 Environment and Geography at the The Future Role of the TV Weather Bill Crawford Presenter by Claire Martin page 182 CMOS President University of Manitoba. In the five minutes for Président de la SCMO Ocean Acidification by James Christian page 183 our talk we presented three requests for the federal government to consider in its The Interacting Scale of Ocean Dynamics next budget: Les échelles d’interaction de la dynamique océanique by/par D. Gilbert & P. Cummins page 185 1) Introduce measures to rapidly reduce greenhouse gas emissions; Interview with Wendy Watson-Wright 2) Invest funds in the provision of science-based climate by Gordon McBean page 187 information; 3) Renew financial support for research into meteorology, On the future of operational forecasting oceanography, climate and ice science, especially in tools by Pierre Dubreuil page 189 Canada’s North, through independent, peer-reviewed projects managed by agencies such as CFCAS and Weather Services for the 2010 Winter NSERC. -
Anemometer Lesson
Anemometers: Measuring the Wind Objectives Students will: • Learn about anemometers. • Learn about engineering design. • Learn how engineering can help solve society's challenges. • Learn about teamwork and problem solving. Suggested Grade Level 3rd – 12th Subject Areas Science, Math, Engineering Timeline 45 minutes Standards • 3-PS2-1. Plan and conduct an investigation to provide evidence of the effects of balanced and unbalanced forces on the motion of an object. • 4-PS3-1. Use evidence to construct an explanation relating the speed of an object to the energy of that object. • 3-5-ETS1-1. Define a simple design problem reflecting a need or a want that includes specified criteria for success and constraints on materials, time, or cost. • 3-5-ETS1-2. Generate and compare multiple possible solutions to a problem based on how well each is likely to meet the criteria and constraints of the problem. • 3-5-ETS1-3. Plan and carry out fair tests in which variables are controlled and failure points are considered to identify aspects of a model or prototype that can be improved. • MS-ETS1-2. Evaluate competing design solutions using a systematic process to determine how well they meet the criteria and constraints of the problem. • HS-PS3-3. Design, build, and refine a device that works within given constraints to convert one form of energy into another form of energy. 21st Century Essential Skills • Critical thinking/Problem solving • Creativity/imagination • Collaboration and Teamwork Revised July/2019 Confidential and Proprietary to the Space Foundation • Carrying out investigations • Obtaining/evaluating/communicating ideas Background Weather patterns are a natural phenomenon that have been observed since the beginning of time. -
Ront November-Ddecember, 2002 National Weather Service Central Region Volume 1 Number 6
The ront November-DDecember, 2002 National Weather Service Central Region Volume 1 Number 6 Technology at work for your safety In this issue: Conceived and deployed as stand alone systems for airports, weather sensors and radar systems now share information to enhance safety and efficiency in the National Airspace System. ITWS - Integrated Jim Roets, Lead Forecaster help the flow of air traffic and promote air Terminal Aviation Weather Center safety. One of those modernization com- Weather System The National Airspace System ponents is the Automated Surface (NAS) is a complex integration of many Observing System (ASOS). technologies. Besides the aircraft that fly There are two direct uses for ASOS, you and your family to vacation resorts, and the FAA’s Automated Weather or business meetings, many other tech- Observing System (AWOS). They are: nologies are at work - unseen, but critical Integrated Terminal Weather System MIAWS - Medium to aviation safety. The Federal Aviation (ITWS), and the Medium Intensity Intensity Airport Administration (FAA) is undertaking a Airport Weather System (MIAWS). The Weather System modernization of the NAS. One of the technologies that make up ITWS, shown modernization efforts is seeking to blend in Figure 1, expand the reach of the many weather and aircraft sensors, sur- observing site from the terminal to the en veillance radar, and computer model route environment. Their primary focus weather output into presentations that will is to reduce delays caused by weather, Gust fronts - Evolution and Detection Weather radar displays NWS - Doppler FAA - ITWS ASOS - It’s not just for airport observations anymore Mission Statement To enhance aviation safety by Source: MIT Lincoln Labs increasing the pilots’ knowledge of weather systems and processes Figure 1. -
Manual for Real-Time Quality Control of Wind Data
Direction Manual for Real-Time Quality Control of Wind Data A Guide to Quality Control and Quality Assurance for Coastal and Oceanic Wind Observations Version 1.0 October 2014 Document Validation U.S. IOOS Program Office Validation 10/17/2014 Zdenka S. Willis, Director, U.S. IOOS Program Office Date QARTOD Project Manager Validation 10/17/2014 Joseph Swaykos, NOAA National Data Buoy Center Date QARTOD Board of Advisors Validation 10/17/2014 Julianna O. Thomas, Southern California Coastal Ocean Observing System Date ii Table of Contents Document Validation ...................................................................................... ii Table of Contents ........................................................................................... iii List of Figures ................................................................................................. iv List of Tables ................................................................................................... iv Revision History ............................................................................................... v Endorsement Disclaimer ................................................................................ vi Acknowledgements ....................................................................................... vii Acronyms and Abbreviations ....................................................................... viii Definitions of Selected Terms ........................................................................ ix 1.0 Background and -
Coop Station Observations
Department of Commerce $ National Oceanic & Atmospheric Administration $ National Weather Service NATIONAL WEATHER SERVICE MANUAL 10-1315 APRIL 18, 2007 Operations and Services Surface Observing Program (Land), NDSPD 10-13 Cooperative Station Observations NOTICE: This publication is available at: http://www.nws.noaa.gov/directives/. OPR: OS7 (J.Newkirk) Certified by: OS7 (D. McCarthy) Type of Issuance: Emergency SUMMARY OF REVISIONS: This Directive supersedes National Weather Service Manual, Cooperative Station Observations, dated September 21, 2006. Re-wrote section 4.1 page A-6, added M for missing data section 4 page D-15 and section 10 page E-6. Moved winterizing Universal Gage out of the F&P Section to the Universal Section. Minor word changes. Signed April 4, 2007 Dennis McCarthy Date Director, Office of Climate Water and Weather Services NWSM 10-1315 APRIL 18, 2007 Cooperative Station Observations Table of Contents: Page 1 Purpose.......................................................................................................................................3 2. Definition of a Cooperative Station...........................................................................................3 3. Reporting Elements....................................................................................................................3 3.1 Precipitation......................................................................................................................3 3.2 Air Temperature................................................................................................................3 -
Development of an in Situ Acoustic Anemometer to Measure Wind in the Stratosphere for SENSOR
https://doi.org/10.5194/amt-2021-76 Preprint. Discussion started: 19 May 2021 c Author(s) 2021. CC BY 4.0 License. Development of an in situ Acoustic Anemometer to Measure Wind in the Stratosphere for SENSOR Song Liang1,2, Hu Xiong1, Wei Feng1, Yan Zhaoai1,3, Xu Qingchen1, Tu Cui1,3 1Key Laboratory of Science and Technology on Environmental Space Situation Awareness, National 5 Space Science Center, Chinese Academy of Sciences, Beijing 100190, China 2College of Earth Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 3College of Materials Science and Opto-Electronic Technology, University of Chinese Academy of Sciences, Beijing 100049, China Correspondence to: Song Liang ([email protected]) 10 Abstract. The Stratospheric Environmental respoNses to Solar stORms (SENSOR) campaign investigates the influence of solar storms on the stratosphere. This campaign employs a long-duration zero-pressure balloon as a platform to carry multiple types of payloads during a series of flight experiments in the mid-latitude stratosphere from 2019 to 2022. This article describes the development and testing of an acoustic anemometer for obtaining in situ wind measurements along the balloon 15 trajectory. Developing this anemometer was necessary, as there is no existing commercial off-the-shelf product, to the authors’ knowledge, capable of obtaining in situ wind measurements on a high-altitude balloon or other similar floating platform in the stratosphere. The anemometer is also equipped with temperature, pressure, and humidity sensors from a Temperature-Pressure-Humidity measurement module, inherited from a radiosonde developed for sounding balloons. The acoustic anemometer and 20 other sensors were used in a flight experiment of the SENSOR campaign that took place in the Da chaidan District (95.37°E, 37.74°N) on 4 September 2019. -
JO 7900.5D Chg.1
U.S. DEPARTMENT OF TRANSPORTATION JO 7900.SD CHANGE CHG 1 FEDERAL AVIATION ADMINISTRATION National Policy Effective Date: 11/29/2017 SUBJ: JO 7900.SD Surface Weather Observing 1. Purpose. This change amends practices and procedures in Surface Weather Observing and also defines the FAA Weather Observation Quality Control Program. 2. Audience. This order applies to all FAA and FAA-contract personnel, Limited Aviation Weather Reporting Stations (LAWRS) personnel, Non-Federal Observation (NF-OBS) Program personnel, as well as United States Coast Guard (USCG) personnel, as a component ofthe Department ofHomeland Security and engaged in taking and reporting aviation surface observations. 3. Where I can find this order. This order is available on the FAA Web site at http://faa.gov/air traffic/publications and on the MyFAA employee website at http://employees.faa.gov/tools resources/orders notices/. 4. Explanation of Changes. This change adds references to the new JO 7210.77, Non Federal Weather Observation Program Operation and Administration order and removes the old NF-OBS program from Appendix B. Backup procedures for manual and digital ATIS locations are prescribed. The FAA is now the certification authority for all FAA sponsored aviation weather observers. Notification procedures for the National Enterprise Management Center (NEMC) are added. Appendix B, Continuity of Service is added. Appendix L, Aviation Weather Observation Quality Control Program is also added. PAGE CHANGE CONTROL CHART RemovePa es Dated Insert Pa es Dated ii thru xi 12/20/16 ii thru xi 11/15/17 2 12/20/16 2 11/15/17 5 12/20/17 5 11/15/17 7 12/20/16 7 11/15/17 12 12/20/16 12 11/15/17 15 12/20/16 15 11/15/17 19 12/20/16 19 11/15/17 34 12/20/16 34 11/15/17 43 thru 45 12/20/16 43 thru 45 11/15/17 138 12/20/16 138 11/15/17 148 12/20/16 148 11/15/17 152 thru 153 12/20/16 152 thru 153 11/15/17 AppendixL 11/15/17 Distribution: Electronic 1 Initiated By: AJT-2 11/29/2017 JO 7900.5D Chg.1 5. -
Snow, Weather, and Avalanches
SNOW, WEATHER, AND AVALANCHES: Observation Guidelines for Avalanche Programs in the United States SNOW, WEATHER, AND AVALANCHES: Observation Guidelines for Avalanche Programs in the United States 3rd Edition 3rd Edition Revised by the American Avalanche Association Observation Standards Committee: Ethan Greene, Colorado Avalanche Information Center Karl Birkeland, USDA Forest Service National Avalanche Center Kelly Elder, USDA Forest Service Rocky Mountain Research Station Ian McCammon, Snowpit Technologies Mark Staples, USDA Forest Service Utah Avalanche Center Don Sharaf, Valdez Heli-Ski Guides/American Avalanche Institute Editor — Douglas Krause — Animas Avalanche Consulting Graphic Design — McKenzie Long — Cardinal Innovative © American Avalanche Association, 2016 ISBN-13: 978-0-9760118-1-1 American Avalanche Association P.O. Box 248 Victor, ID. 83455 [email protected] www. americanavalancheassociation.org Citation: American Avalanche Association, 2016. Snow, Weather and Avalanches: Observation Guidelines for Avalanche Programs in the United States (3rd ed). Victor, ID. FRONT COVER PHOTO: courtesy Flathead Avalanche Center BACK COVER PHOTO: Chris Marshall 2 PREFACE It has now been 12 years since the American Avalanche Association, in cooperation with the USDA Forest Service National Ava- lanche Center, published the inaugural edition of Snow, Weather and Avalanches: Observational Guidelines for Avalanche Programs in the United States. As those of us involved in that first edition grow greyer and more wrinkled, a whole new generation of avalanche professionals is growing up not ever realizing that there was a time when no such guidelines existed. Of course, back then the group was smaller and the reference of the day was the 1978 edition of Perla and Martinelli’s Avalanche Handbook.