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  • Articles - EJSSM Scientific Discussions Board
    Great Plains Started by Roger Edwards 02 Nov 2011 4 replies 4 110 views Chuck Doswell 27 Jul 2012 EJSSM 4 3 A Case Study of a Long lived Tornadic Mesocyclone in a Low CAPE Complex terrain Environment Started by Roger Edwards 01 Jan 2010 3 replies 5 271 views Chuck Doswell 04 Mar 2010 EJSSM 9 5 Evaluation of Sounding Derived Thermodynamic and Wind Related Parameters Associated with Large Hail Events Started by Roger Edwards 12 Dec 2014 3 replies 5 331 views Ryan Jewell 06 Jan 2015 EJSSM 4 1 The Supercell Spectrum Part II A Semi Objective Method for Radar Classification of Supercell Type Started by Elke admin 25 Mar 2009 2 replies 9 263 views Jim Johnson 03 Apr 2009 EJSSM 2 1 Historical Overview of Severe Convective Storms Research Started by Roger Edwards 03 Apr 2009 2 replies 6 824 views Roger Edwards 03 Apr 2009 EJSSM 2 2 Documentation of a Rare Tornadic Left Moving Supercell Started by Roger Edwards 03 Apr 2009 2 replies 8 725 views Matt Bunkers 15 Jul 2010 EJSSM 2 4 A Comparison of Two Cold Fronts Effects of the Planetary Boundary Layer on the Mesoscale Started by Roger Edwards 03 Apr 2009 2 replies 6 394 views Roger Edwards 03 Apr 2009 EJSSM 3 1 A Case Study in Forensic Meteorology Investigating the 3 April 1956 Tornadoes in Western Lower Michigan Started by Roger Edwards 03 Apr 2009 2 replies 6 453 views Roger Edwards 03 Apr 2009 EJSSM 7 7 A Multiscale Analysis of the 1 June 2011 Northeast U S Severe Weather Outbreak and Associated Springfield Massachu Started by Roger Edwards 24 Sep 2012 2 replies 3 645 views Peter Banacos 18 Nov 2012 EJSSM 2 5 Small Sample Size and Data Quality Issues Illustrated Using Tornado Occurrence Data Started by Roger Edwards 03 Apr 2009 1 reply 6 139 views Roger Edwards 03 Apr 2009 EJSSM 2 7 A Forecaster s Story Robert H Johns Started by Roger Edwards 03 Apr 2009 1 reply 6 133 views Roger Edwards 07 Jan 2010 EJSSM 5 7 On the Use of Areal Coverage of Parameters Favorable for Severe Weather to Discriminate Major Outbreaks Started by Roger Edwards 31 Dec 2010 1 reply 13 160 views Roger Edwards 25 Jan 2011 EJSSM 6 5 Precipitation properties of supercell hook echoes Started by Roger Edwards 06 Oct 2011 1 reply 2 600 views Matt Bunkers 13 Oct 2011 EJSSM 7 1 A Modeling Study of Supercell Development in the Presence of a Preexisting Airmass Boundary Started by Roger Edwards 20 Jan 2012 1 reply 2 959 views Chuck Doswell 21 Jan 2012 EJSSM 7 2 Operational Uses of Spectrum Width Started by Roger Edwards 02 Mar 2012 1 reply 3 279 views Matt Bunkers 20 Mar 2012 EJSSM 7 4 Russian Tornado Outbreak of 9 June 1984 Started by Roger Edwards 21 Aug 2012 1 reply 3 917 views Valerian Jewtoukoff 02 Sep 2013 EJSSM 7 6 Tropical Cyclone

    Original URL path: http://ejssm.org/forums/index.php?showforum=10&st=&sort_key=posts&sort_by=Z-A (2016-05-01)
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  • Articles - EJSSM Scientific Discussions Board
    Surface Observations on High Resolution Forecasts of the 15 May 2013 To Started by Roger Edwards 23 Oct 2015 0 replies 9 438 views Roger Edwards 23 Oct 2015 EJSSM 4 1 The Supercell Spectrum Part II A Semi Objective Method for Radar Classification of Supercell Type Started by Elke admin 25 Mar 2009 2 replies 9 263 views Jim Johnson 03 Apr 2009 EJSSM 3 3 In Situ Observations of the 21 April 2007 Tulia Texas Tornado Started by Roger Edwards 03 Apr 2009 4 replies 8 973 views wpsokeland 06 Apr 2012 EJSSM 2 2 Documentation of a Rare Tornadic Left Moving Supercell Started by Roger Edwards 03 Apr 2009 2 replies 8 725 views Matt Bunkers 15 Jul 2010 EJSSM 6 4 Bow Echo and Mesovortex Evolution during the 2 May 2007 North Texas Derecho Started by Roger Edwards 02 May 2011 0 replies 8 376 views Roger Edwards 02 May 2011 EJSSM 4 2 Total Lightning Observations of Supercells over North Central Texas Started by Elke admin 27 Jun 2009 0 replies 7 969 views Elke admin 27 Jun 2009 EJSSM 1 3 On the Use of Indices and Parameters in Forecasting Severe Storms Started by Roger Edwards 03 Apr 2009 5 replies 7 637 views Roger Edwards 03 Apr 2009 EJSSM 2 1 Historical Overview of Severe Convective Storms Research Started by Roger Edwards 03 Apr 2009 2 replies 6 824 views Roger Edwards 03 Apr 2009 EJSSM 10 3 The Characteristics of United States Hail Reports 1955 2014 Started by Roger Edwards 31 Dec 2015 0 replies 6 617 views Roger Edwards 31 Dec 2015 EJSSM 3 1 A Case Study in Forensic Meteorology Investigating the 3 April 1956 Tornadoes in Western Lower Michigan Started by Roger Edwards 03 Apr 2009 2 replies 6 453 views Roger Edwards 03 Apr 2009 EJSSM 2 4 A Comparison of Two Cold Fronts Effects of the Planetary Boundary Layer on the Mesoscale Started by Roger Edwards 03 Apr 2009 2 replies 6 394 views Roger Edwards 03 Apr 2009 EJSSM 10 1 Verification and Analysis of Impact Based Tornado Warnings in the Central Region of the National Weather Service Started by Roger Edwards 11 Sep 2015 1 reply 6 281 views Matt Bunkers 17 Oct 2015 EJSSM 2 5 Small Sample Size and Data Quality Issues Illustrated Using Tornado Occurrence Data Started by Roger Edwards 03 Apr 2009 1 reply 6 139 views Roger Edwards 03 Apr 2009 EJSSM 2 7 A Forecaster s Story Robert H Johns Started by Roger Edwards 03 Apr 2009 1 reply 6 133 views Roger Edwards 07 Jan 2010 EJSSM 11 2 Inferring the Severity of a Multicell Thunderstorm Evolving to Supercell by Means of Radar and Total Lightning Started by Roger Edwards 24 Mar 2016 0 replies 5 943 views Roger Edwards 24 Mar 2016 EJSSM 3 2 Discriminating between Tornadic and Non Tornadic Supercells A New Hodograph Technique Started by Roger Edwards 03 Apr 2009 0 replies 5 412

    Original URL path: http://ejssm.org/forums/index.php?showforum=10&st=&sort_key=views&sort_by=Z-A (2016-05-01)
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  • EJSSM Forum Information and Guidelines - Articles - EJSSM Scientific Discussions Board
    related to the journal s published papers The Forum threads are keyed to specific papers and open to anyone with a valid EJSSM login The Forum is only for frank open and professionally civil discourse on the ideas hypotheses and findings presented within EJSSM manuscripts Critical comments and challenges and responses are a valid and important part of scientific discourse and should be supported by scientific reasoning and logic including citations when possible The Forum moderators have the right to delete edit split join rename or lock any thread at their discretion The EJSSM Board occasionally may modify Forum policies Other information The first and last name of the posting person must be visible to Forum readers Any use of signature sig lines must be brief name of the person posting and optionally professional or research affiliation and contact information If you are replying to another person s post it is acceptable to include a small portion 4 to 5 lines of that person s original message in your post The standard way of doing this is to surround the quoted post using the BB quote tags so that people reading your post will know that the quoted words are

    Original URL path: http://ejssm.org/forums/index.php?showtopic=22 (2016-05-01)
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  • Matt Bunkers - Viewing Profile - EJSSM Scientific Discussions Board
    functionality Overview Profile Feed Likes Friends Topics Posts Matt Bunkers Member Since 04 Apr 2009 Offline Last Active Oct 17 2015 05 49 PM Find content Community Stats Group Members Active Posts 6 Profile Views 10 175 Member Title Newbie Age Age Unknown Birthday Birthday Unknown Gender Male 0 Neutral User Tools Friends Matt Bunkers hasn t added any friends yet Latest Visitors Guest 09 Feb 2012 02 22 Jon

    Original URL path: http://ejssm.org/forums/index.php?showuser=13 (2016-05-01)
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  • EJSSM 9.5: Evaluation of Sounding-Derived Thermodynamic and Wind-Related Parameters Associated with Large Hail Events - Articles - EJSSM Scientific Discussions Board
    and motion would 1 Maximize the NUMBER of embryos including hail that can be made again into larger hail resulting in larger amounts of hail which in turn 2 maximized the probability that several stones will become particularly large Think of all the NW flow events in the plains that produce not only large hail but large amounts of hail These environments are characterized by usually weak SLY boundary layer flow veering quickly to NWLY Little or no low levej jet Moisture may not even be that substantial but lapse rate profiles are usually very steep Due to the weakness of the lower level winds SRH and hodograph curvature is also small yet these are notorious hail and also wind producers Of course giant hail also occurs with supercells that have enormous hodograph curvature but do these storms typically produce the larger AMOUNTS of hail or just a few lucky stones that happen to make it to 4 5 Lets discuss further Back to top 3 AaronJ AaronJ Newbie Members 1 posts Posted 06 January 2015 08 03 PM Thanks for the kind words as I ve added a few comments myself Nice writeup I have a few comments Responses A common practice in severe convective literature is to group 2 0 in 25 mm diameter hail into one range but typically with little reasoning provided e g Jewell and Brimelow 2009 The only reason to do that is to match up with our SIGHAIL forecasting product used in outlooks We are tasked with forecasting simply yes or no with regard to SIGHAIL so that is the sole reason for the binning Completely understand although this practice well before your referenced manuscript has proliferated through hail based literature to the point very few even question if there might be physical reasoning for binning reports in this manner I would speculate most are simply blindly adopting previous literature methodology even when results indicate a need for breaking apart this range However Donavon 2010 notes a difference in radar based thresholds and potential environments that support 1 75 in 45 mm hail compared to 1 0 in 25 mm sizes Further due to estimation errors noted previously by Buamgardt 2014 1 0 in 25 mm and 1 25 in 32 mm reports are inseparable in hail bin assignment with the same connected relationship existing with 1 5 in 38 mm and 1 75 in 45 mm reports Given these realities another logical break exists between a 0 75 1 25 in 19 32 mm group and a 1 5 1 75 in 38 45 mm range of values That s fine but I highly question a good percentage of 1 75 aka Golf Ball reports I think an inordinate number of Golf Balls are really 1 00 1 25 hail I m not sure I would totally agree with an inordinate number but would concur there are likely some quarters golf balls contained within the adjacent larger smaller hail size bin as both Baumgardt and your 2009 study reveal a noted bias toward common object hail reports e g quarters and golf balls However personal experience and as noted in the Baumgardt study indicates this bias pales in comparison to the number of half dollar hailstones reported as quarters ping pong hailstones reported up to golf ball and hen egg hail reported down into the golf ball range We created some level of mitigation of the first two via a hail size range that includes each diameter However the latter is a different story as mitigation was initially included via a 1 5 2 0 in hail size range yet reviewer feedback drove the authors to break it apart by placing 2 0 in cases into the legacy SIGHAIL range Given this scenario it is much more likely an inordinate number of the golf ball reports are potentially SIGHAIL days if staying with the legacy 2 0 in threshold Specifically I don t know if raising or lowering the SIGHAIL threshold is the answer but the legacy threshold is essentially splitting two sizes 1 75 in from 2 0 in that science says are inseparable due to reporting biases Further a skewing of results may exist SPC 2014 by the removal of all 1 75 2 0 in 45 51 mm reports in order to magnify interquartile separation We have a graph showing this filtering out of the 1 75 2 00 but it was not usedin creating the parameter For that we used all sizes Also to make a more direct comparison in fig 13 you should have 1 5 reports included you only go up to 1 25 and we did not filter out 1 50 Ping Pongs Good point as the 1 5 in reports could have been included for a more direct comparison although given the previously noted reporting biases separating 1 5 in from 1 75 in makes no physical sense We debated mentioning SHIP here as the lack of literary support and performance against multiple binned hail sizes initially pushed us toward omitting the parameter but prevalence in forecast ops drove us to include it in the manuscript Further values are slightly lower in comparison to Jewell and Brimelow 2009 despite all differences being statistically significant If you are using objective analysis then I think the primary reason for the disparity is that we cross checked with surface obs and made sure the storm was in the same air mass for each case Models tend to smear out gradients and lag rapidly changing surface conditions as well such as a lifting warm front In addition a storm could be just north of a boundary yet close enough to still be ingesting the higher theta e air to the south Only way to know for sure it to check surface obs for each case Since thermodynamic parameters are so sensitive to a few degrees difference of the dewpoint for example we felt it was necessary to check

    Original URL path: http://ejssm.org/forums/index.php?showtopic=99 (2016-05-01)
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  • Ryan Jewell - Viewing Profile - EJSSM Scientific Discussions Board
    javascript to access full functionality Overview Profile Feed Likes Friends Topics Posts Ryan Jewell Member Since 29 Dec 2014 Offline Last Active Jan 06 2015 08 33 PM Find content Community Stats Group Members Active Posts 2 Profile Views 3 285 Member Title Newbie Age Age Unknown Birthday Birthday Unknown Gender Male 0 Neutral User Tools Friends Ryan Jewell hasn t added any friends yet Latest Visitors AaronJ 06 Jan

    Original URL path: http://ejssm.org/forums/index.php?showuser=1733 (2016-05-01)
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  • EJSSM 9.4: Would “Tornado-Preventing” Walls Work? - Articles - EJSSM Scientific Discussions Board
    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 17 October 2014 02 57 PM EJSSM Forum comments are welcome on this article by Coffer 2014 Abstract Simulations were performed using the Weather Research and Forecasting model in order to evaluate a proposal that called for the construction of three east west great walls in the American Midwest to eliminate the major threat of tornadoes in Tornado Alley The results of three simulations using the 31 May 2013 tornado outbreak are presented one with natural terrain one with 300 m tall walls as proposed and another with walls much taller than proposed 2500 m Through comparisons of temperature moisture instability and supercell and tornado composite forecasting parameters the tornado preventing walls as proposed are shown to have very little impact on the atmosphere When the height of the walls is greatly increased the location of convective storms shifts eastward instead of being eliminated The short term impacts of the taller walls imply possible desertification and areas with increased probability of non supercellular tornadoes near the edges

    Original URL path: http://ejssm.org/forums/index.php?showtopic=98 (2016-05-01)
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  • EJSSM 9.3: Effects of Mid- and Upper-level Drying on Microphysics of Simulated Supercell Storms - Articles - EJSSM Scientific Discussions Board
    article by Lindley et al 2014 Abstract Conceptual differences are presented among supercell storms simulated with midlevel and deep dry layers of varying magnitude Initial patterns are identified which should be studied more comprehensively using observed or simulated data These initial results indicate that mixing ratios of small ice particles are most sensitive to the depth of a dry layer rather than to its magnitude with fewer particles in simulations containing a deep dry layer Hail from frozen drops may be most abundant when a deep layer is dried and bursts of hail species reaching low levels may be followed 15 20 min later by an increase in low level vertical vorticity associated with the mesocyclone Warm rain occurs repeatedly on the upshear side of the echo appendage is especially variable in quantity and is disfavored in simulations with a dry layer at midlevels Increases in warm rain mixing ratio may be followed 10 20 min later by an increase in low level vertical vorticity though this association is sensitive to location of the warm rain and concurrent microphysical and dynamical processes In simulations with substantial dry layers vertical vorticity was concentrated more rapidly in association with the mesocyclone at

    Original URL path: http://ejssm.org/forums/index.php?showtopic=96 (2016-05-01)
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