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  • Roger Edwards - Viewing Profile - EJSSM Scientific Discussions Board
    water and storm photography nonprofit site http www skypix ws Full time job http www spc noaa gov Stock photography clearinghouse http www insojourn com cms Storm observing BLOG http stormeyes org latest Community Stats Group Administrators Active Posts 161 Profile Views 42 463 Member Title Advanced Member Age Age Unknown Birthday Birthday Unknown Gender Male Location Norman OK Interests For the purposes of this forum EJSSM Contact Information Website

    Original URL path: http://ejssm.org/forums/index.php?s=e792df8f80d9ed113bd0f704bd2ef925&showuser=5 (2016-05-01)
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  • EJSSM 11.2: Inferring the Severity of a Multicell Thunderstorm Evolving to Supercell, by Means of Radar and Total Lightning - Articles - EJSSM Scientific Discussions Board
    For the purposes of this forum EJSSM Posted 24 March 2016 11 16 AM EJSSM forum comments are welcome on this article by Rigo and Pineda 2016 Abstract This study analyzes a long lived thunderstorm with supercell characteristics that took place in the northeastern Iberian Peninsula on 5 July 2012 Severe weather features identified in Doppler radar and total lightning data have been used to infer the severity of this large hail bearing storm that substantially damaged local agriculture Key elements identified in the radar product analysis were relatively short development time a long mature phase lasting 2 h and high and sustained values for most of the radar parameters reflectivity vertically integrated liquid echo tops which showed an evolution from multicell to supercell structure Nevertheless the most significant patterns were the vertical lifting of the cell core the three body scatter spike the bounded weak echo region and the anticyclonic rotation observed in the Doppler velocity fields Key features identified in the lightning analysis were 1 the total lightning jump as an early sign for severity 2 the low negative cloud to ground CG flash rate and 3 the low intensities in negative CG strokes and the regular rate

    Original URL path: http://ejssm.org/forums/index.php?s=e792df8f80d9ed113bd0f704bd2ef925&showtopic=104 (2016-05-01)
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  • Electronic Sessions - EJSSM Scientific Discussions Board
    Sort direction Descending Z A Ascending A Z Time frame From Today Last 5 days Last 7 days Last 10 days Last 15 days Last 20 days Last 25 days Last 30 days Last 60 days Last 90 days Show All Since Last Visit Remember filters Topic Started By Stats Last Post Info No topics were found This is either because there are no topics in this forum or the

    Original URL path: http://ejssm.org/forums/index.php?s=e792df8f80d9ed113bd0f704bd2ef925&showforum=11 (2016-05-01)
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  • EJSSM 11.1: An Examination of the Mesoscale Environment and Evolution of the Northern Indiana/Northwest Ohio Derecho of 29 June 2012 - Articles - EJSSM Scientific Discussions Board
    Feb 05 2016 02 23 AM Please log in to reply No replies to this topic 1 Roger Edwards Roger Edwards Advanced Member Administrators 161 posts Gender Male Location Norman OK Interests For the purposes of this forum EJSSM Posted 05 February 2016 02 23 AM EJSSM forum comments are welcome on this article by Bentley and Logsdon 2016 Abstract A multicell cluster of thunderstorms moved into northern Indiana during the early afternoon hours of 29 June 2012 later evolving into a mature bowing mesoscale convective system MCS by the time it exited the County Warning Area of the Northern Indiana National Weather Service This was the beginning of a derecho that would continue across the Appalachian Mountains and off the Atlantic coast traveling 1000 km in 10 h and resulting in at least 18 fatalities This derecho produced a measured wind gust of 41 m s 1 79 kt at Fort Wayne International Airport the highest measured gust along the derecho s path The mesoscale environment was characterized by a strong cold pool extreme instability including near record steep midlevel lapse rates and weak to moderate vertical shear This paper examines the source of this extreme environment as well

    Original URL path: http://ejssm.org/forums/index.php?s=e792df8f80d9ed113bd0f704bd2ef925&showtopic=103 (2016-05-01)
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  • EJSSM 10.3: The Characteristics of United States Hail Reports: 1955-2014 - Articles - EJSSM Scientific Discussions Board
    and Tippett 2015 Abstract The United States hail observation dataset maintained and updated annually by the Storm Prediction Center is one of the largest currently available worldwide and spans the period 1955 present Despite its length climatology of this dataset is nontrivial because of numerous characteristics that are nonmeteorological in origin Here the main features and limitations of the dataset are explored including the implications of an increasing frequency in the time series approaches to spatial smoothing of observations and the sources that contribute to the hail dataset Despite these problems using limited temporal windows spatial binning and judicious application of smoothing techniques reveals important characteristics of the hail dataset The annual and diurnal cycles are found to be sensitive to the spatial shift northwards of observations and increasing report frequency in the Southeast Hail days in contrast to hail reports show no national trend over the last 25 y Regional and local influences on hail reporting are identified stemming from verification procedures and contributions from local officials The change in the definition of severe hail size from 0 75 in 1 9 cm to 1 00 in 2 5 cm in 2010 has a particularly clear signature in the

    Original URL path: http://ejssm.org/forums/index.php?s=e792df8f80d9ed113bd0f704bd2ef925&showtopic=102 (2016-05-01)
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  • EJSSM 10.2: Investigating the Impacts of Assimilating Surface Observations on High-Resolution Forecasts of the 15 May 2013 Tornado Event - Articles - EJSSM Scientific Discussions Board
    Edwards Roger Edwards Advanced Member Administrators 161 posts Gender Male Location Norman OK Interests For the purposes of this forum EJSSM Posted 23 October 2015 07 33 PM EJSSM Forum comments are welcome on this article by Carlaw et al 2015 Abstract In this study the Advanced Regional Prediction System ARPS and its associated three dimensional variational analysis 3DVAR package are used to simulate a tornadic supercell at 400 m grid spacing This storm produced an EF3 tornado in Johnson County TX during the evening of 15 March 2013 Data from Doppler radar satellite aircraft radiosondes profilers and surface observations are assimilated in this work We show that the assimilation of non conventional surface observations from three networks the Citizen Weather Observer Program CWOP Global Science and Technology GST and Automated Weather Stations AWS operated by EarthNetworks in and around the storm inflow were fundamentally important to the development of an intense low level mesocyclone Simulations that did not incorporate this non conventional data either developed a weak mesocyclone that was displaced to the east of the actual tornado track or were unable to develop a defined mesocyclone in the first place In particular the assimilation of thermodynamic variables temperature

    Original URL path: http://ejssm.org/forums/index.php?s=e792df8f80d9ed113bd0f704bd2ef925&showtopic=101 (2016-05-01)
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  • EJSSM 10.1: Verification and Analysis of Impact-Based Tornado Warnings in the Central Region of the National Weather Service - Articles - EJSSM Scientific Discussions Board
    damage wording within an IBTW is shown to relate to the Enhanced Fujita EF scale Wording included in non tagged IBTWs corresponds to EF0 EF2 tornado damage while the damage wording for tagged IBTWs corresponds to EF3 EF5 tornado damage This study investigates the accuracy of IBTWs by examining if a tornado occurs during the warning time frame and whether the resulting damage matches the damage wording in the IBTW All IBTWs from 1 April 2013 through 30 November 2013 were collected as well as tornado survey information Using these survey data IBTWs were verified by the intensity of the tornado if one occurred Probability of detection POD and false alarm ratio FAR statistics are calculated through 2 2 contingency tables for both non tagged and tagged IBTWs Results indicate that the majority of both non tagged and tagged IBTWs are false alarms and tagged IBTWs have a very low POD Other studies have shown that limitations in current technology and scientific knowledge may contribute to false alarms and missed detections Case studies are examined to analyze whether these limitations play role in the use of IBTWs Back to top 2 Matt Bunkers Matt Bunkers Newbie Members 6 posts Gender Male Posted 17 October 2015 05 50 PM This is an interesting study and one that needs to be done albeit the sample size is a bit small and geographically unrepresentative at this stage of the IBW experiment Putting that aside my main comment is that this study is fundamentally flawed by using the EF3 scale as the break point for the considerable CON tag Dr Klockow noted this in her review but didn t demand the authors adhere to it From the beginning of the IBW experiment NWS forecasters have been trained to use the CON tag for observed

    Original URL path: http://ejssm.org/forums/index.php?s=e792df8f80d9ed113bd0f704bd2ef925&showtopic=100 (2016-05-01)
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  • AaronJ - Viewing Profile - EJSSM Scientific Discussions Board
    enable javascript to access full functionality Overview Profile Feed Likes Friends Topics Posts AaronJ Member Since 06 Jan 2015 Offline Last Active Jan 08 2015 07 23 PM Find content Community Stats Group Members Active Posts 1 Profile Views 10 570 Member Title Newbie Age Age Unknown Birthday Birthday Unknown Gender Not Telling 0 Neutral User Tools Friends AaronJ hasn t added any friends yet Latest Visitors No latest visitors

    Original URL path: http://ejssm.org/forums/index.php?s=e792df8f80d9ed113bd0f704bd2ef925&showuser=1762 (2016-05-01)
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