Warm-Season Lake-/Sea-Breeze Severe Weather in the Northeast Patrick H. Wilson, Lance F. Bosart, and Daniel Keyser


НазваWarm-Season Lake-/Sea-Breeze Severe Weather in the Northeast Patrick H. Wilson, Lance F. Bosart, and Daniel Keyser
Дата конвертації05.05.2013
Розмір498 b.
ТипПрезентации


Warm-Season Lake-/Sea-Breeze Severe Weather in the Northeast

  • Patrick H. Wilson, Lance F. Bosart, and Daniel Keyser

  • Department of Earth and Atmospheric Sciences, University at Albany, Albany, NY

  • Thomas A. Wasula

  • NOAA / National Weather Service, Albany, NY

  • CSTAR II Grant NA04NWS4680005


Research Goals

  • Investigate thermodynamical and dynamical processes along with physiographic effects

  • Increase understanding of this phenomenon



Methodology – Part I

  • Warm-Season: April – October

  • Domain: OH, PA, MD, DE, NJ, NY, VT, NH, MA, CT, RI, ME

  • Selected cases from Storm Prediction Center archived storm data 2000-present

  • Verified from National Climatic Diagnostic Center archived radar data



Methodology – Part II

  • Obtained NCEP/NARR gridded datasets for each case and plot important weather variables

  • Collected soundings, radar data, and surface observations

  • Classified cases into separate categories and conducted case study analyses



Case Classifications

  • Pure Case: mesoscale forcing primary;

  • synoptic-scale forcing secondary

  • Mixed Case: mesoscale forcing and synoptic-

  • scale forcing working together

  • Null Case: convection suppressed by

  • lake-/sea-breeze processes



Case List

  • Pure Cases

  • 9 August 2001 (Ontario)

  • 6 July 2003 (Erie)

  • 7 August 2005 (Chesapeake)

  • 2 August 2006 (Ontario)



1200 UTC 9 August 2001 (Pure Case)



1200 UTC 9 August 2001



1200 UTC 9 August 2001



1200 UTC 9 August 2001 http://weather.uwyo.edu/upperair/sounding.html



1500 UTC 9 August 2001



1800 UTC 9 August 2001



1800 UTC 9 August 2001



1700 UTC 9 August 2001



1700 UTC 9 August 2001 Radar Composite



1800 UTC 9 August 2001 Radar Composite



1900 UTC 9 August 2001 Radar Composite



2000 UTC 9 August 2001 Radar Composite



2100 UTC 9 August 2001 Radar Composite



2200 UTC 9 August 2001 Radar Composite



2300 UTC 9 August 2001 Radar Composite



0000 UTC 10 August 2001 Radar Composite



0100 UTC 10 August 2001 Radar Composite



0200 UTC 10 August 2001 Radar Composite



9 August 2001 Storm Reports



Pure Cases: Preliminary Conclusions

  • Ridge axis in place at the surface or aloft

  • Low unidirectional wind shear in low-levels (< 10 m s-1 for 925-700 hPa layer)

  • T > 30°C, Td > 20°C, CAPE > 1500 J kg-1

  • Placement and timing signal by θe-ridge axis (θe > 335 K)

  • Intersections of boundaries enhance convection

  • Tendency to become squall lines and prefer valleys

  • Occur most often during hottest months of summer



1200 UTC 19 June 2002 (Mixed Case)



1200 UTC 19 June 2002



1200 UTC 19 June 2002



1200 UTC 19 June 2002 http://weather.uwyo.edu/upperair/sounding.html



1500 UTC 19 June 2002



1800 UTC 19 June 2002



1800 UTC 19 June 2002



1800 UTC 19 June 2002 Radar Composite



1900 UTC 19 June 2002 Radar Composite



2000 UTC 19 June 2002 Radar Composite



19 June 2002 Storm Reports



Mixed Cases: Preliminary Conclusions

  • Troughs generally in place at the surface or aloft

  • Typically more wind shear (speed shear and veering winds) in low levels

  • 20°C < T < 30°C, 10°C < Td < 20°C, θe > 320 K

  • Cyclonic vorticity and cyclonic vorticity advection important

  • Intersection of boundaries enhance convection

  • Occur most often during late spring and early autumn



1800 UTC 11 July 2006 (Null Case)



1800 UTC 11 July 2006



1800 UTC 11 July 2006 Radar Composite



11 July 2006 Storm Reports



1800 UTC 6 July 2003 MODIS Satellite http://rapidfire.sci.gsfc.nasa.gov/realtime/



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