19 july 2006 derecho a meteorological perspective and lessons learned from this event
This presentation is the property of its rightful owner.
Sponsored Links
1 / 28

19 July 2006 Derecho: A Meteorological Perspective and Lessons Learned from this Event PowerPoint PPT Presentation


  • 86 Views
  • Uploaded on
  • Presentation posted in: General

19 July 2006 Derecho: A Meteorological Perspective and Lessons Learned from this Event. Ron W. Przybylinski, James E. Sieveking, Benjamin D. Sipprell NOAA / National Weather Service St. Louis Jared L. Guyer NOAA/NWS/NCEP Storm Prediction Center. 2009 Spring Media Workshop.

Download Presentation

19 July 2006 Derecho: A Meteorological Perspective and Lessons Learned from this Event

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


19 july 2006 derecho a meteorological perspective and lessons learned from this event

19 July 2006 Derecho:A Meteorological Perspective and Lessons Learned from this Event

Ron W. Przybylinski, James E. Sieveking, Benjamin D. Sipprell NOAA / National Weather Service St. LouisJared L. GuyerNOAA/NWS/NCEP Storm Prediction Center

2009 Spring Media Workshop


Outline of this presentation

Outline of this Presentation

  • Synoptic scale conditions the morning of 19 July 2006

  • Storm overview (large scale perspective)

  • Mesoscale Environment during the afternoon of 19 July 2006 over southern Iowa, Missouri and Illinois.

  • WSR-88D Doppler radar analysis of the storm complex from WFO Lincoln Illinois and WFO St. Louis perspectives.

  • Some final comments


Upper air analysis 1200 utc 19 july 2006

Upper Air Analysis - 1200 UTC 19 July 2006

250 mb analysis

500 mb analysis


Upper air analysis 1200 utc 19 july 20061

Upper Air Analysis - 1200 UTC 19 July 2006

850 mb analysis

RUC 700-500 mb lapse rate (°C km-1)


1200 utc dvn observed raob

1200 UTC DVN Observed Raob


Radar imagery composites and 06z spc outlook

Radar Imagery Composites and 06z SPC Outlook

Composite base reflectivity 1210 UTC

SPC radar animation

1200-1315 UTC


Radar imagery composites and 13z spc outlook

Radar Imagery Composites and 13z SPC Outlook

Composite base reflectivity 1610 UTC

SPC radar animation

1454-1615 UTC


Hourly mcs track and storm reports

Hourly MCS Track and Storm Reports


19 july 2006 derecho a meteorological perspective and lessons learned from this event

1800 UTC Surface Analysis 19 July 2006


19 july 2006 derecho a meteorological perspective and lessons learned from this event

RUC 00-hr Sounding for SPI at 2100 UTC


19 july 2006 derecho a meteorological perspective and lessons learned from this event

18

19

20

21

22

17

Winchester, IL (WNC) Profiler 1700 - 2200 UTC


19 july 2006 derecho a meteorological perspective and lessons learned from this event

SPC Mesoscale analysis for MLCAPE and 0-6 km bulk shear at 2300 UTC

MLCAPE ranged from 2000 – 6000 J kg-1 acrosseastern Missouri throughwest-central Illinois

Deep layer shear weak

with magnitudes of

10 – 22 m s-1


19 july 2006 derecho a meteorological perspective and lessons learned from this event

RUC 00-hr Sounding for STL at 2300 UTC


19 july 2006 derecho a meteorological perspective and lessons learned from this event

Parker’s Study on Linear MCS archetypes

The 19 July 2006 Damaging Wind Convective system followed theParallel Stratiform (PS) archetype


19 july 2006 derecho a meteorological perspective and lessons learned from this event

WSR-88D Radar Imageryfrom Lincoln Illinois (KILX)at 2138 UTC

Parallel Stratiform Parker and Johnson 2000


19 july 2006 derecho a meteorological perspective and lessons learned from this event

Conceptual model of a multicell cluster storm complex.(NSSL)


19 july 2006 derecho a meteorological perspective and lessons learned from this event

KLSX radar imagery for 2332 UTC

2332 UTC Radar imagery from St. Louis (KLSX). The strongest winds were associated with convective segment #3 (larger echo mass).Several witnessesover southern Macoupin County experience hail up to nickel size with the stronger downbursts behind the leading gust front.


19 july 2006 derecho a meteorological perspective and lessons learned from this event

I Was Here!

7:01 PM CDT Reflectivity (left), Base velocity (right). The strongest winds were detected with the higher reflectivity cores over northwest Madison County Illinois.


19 july 2006 derecho a meteorological perspective and lessons learned from this event

Loop of the evolution of a single severe cell over the western part of the storm complex.


19 july 2006 derecho a meteorological perspective and lessons learned from this event

Bunker Hill

ASOS / AWOS Surface Observation sites around the GreaterSt. Louis metro area.


19 july 2006 derecho a meteorological perspective and lessons learned from this event

When was the last time we documented a case similarto the July 19, 2006 Derecho?

Aug 10, 1992. The convective complex formed just southwest of KLSXand moved south-southward through west-central Arkansas. Widespread wind damage occurred with this derecho.


19 july 2006 derecho a meteorological perspective and lessons learned from this event

The July 19 2006 damage map reveals that much of the downbursts was oriented from north-northeast to south-southwest – an unusual direction.This direction of damaging winds future intensified the degree of damage over the greater St. Louis metro area.


19 july 2006 derecho a meteorological perspective and lessons learned from this event

Tower Grove Park


19 july 2006 derecho a meteorological perspective and lessons learned from this event

Summary

  • On 19 July 2006 formed over northeast Iowa and causedsevere wind damage from parts of northeast Iowa through central Illinois and then south-southwest across the Greater St. Louis metro area and then into southwest Missouri.(A typical movement).

  • -Over 500,000 people were without power from this windstorm. The oppressive HEAT AND HUMIDTYafter this event brought suffering to a large part of the population. - The environment over the Mid-Mississippi Valley regionwas extremely unstable with ML CAPEs of 2600 to 6000 J/Kg while a deep layer shear was weak (< 22 m s-1 )


19 july 2006 derecho a meteorological perspective and lessons learned from this event

  • RUC sounding at 2300 UTC from STL showed a very weak cap.- The upper-level ridge over the central plains built eastwardinto Illinois allowing the MCS to move in a south-southwestdirection during the late afternoon and evening. - The overall storm morphology took on the characteristics of “parallel stratiform” type system where three convective segments showed “pulse – multicellular” characteristics. - Convective segment #3 (eastern most storm) was themost consistent storm complex of the three groups. -


19 july 2006 derecho a meteorological perspective and lessons learned from this event

  • Surface winds along the leading edge of the gustfront varied between 20 to 31 m s-1. - The strongest surface winds were associated with the isolated convective towers through the area of mature convection. Wind speed estimates – 40 m s-1

  • - This wind storm was one of the more challenging cases, from both a national and local WFO perspective.


  • Login