the august 9 2001 lake breeze severe weather event across new york and western new england
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The August 9, 2001 Lake Breeze Severe Weather Event Across New York and Western New England Thomas A. Wasula NOAA/NWS WFO at Albany Motivation CSTAR II Project Northeast Warm Season Severe Weather

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the august 9 2001 lake breeze severe weather event across new york and western new england

The August 9, 2001 Lake Breeze Severe Weather Event Across New York and Western New England

Thomas A. Wasula

NOAA/NWS WFO at Albany

motivation
Motivation
  • CSTAR II Project
    • Northeast Warm Season Severe Weather
    • Identify the role terrain features and land/water boundaries (i.e. Great Lakes, Long Island Sound, Chesapeake Bay, etc.) have on convective development and evolution
    • Several case studies will analyzed and a climatology will attempt to be developed
    • Mesoscale datasets (observational and model)
contributors to cstar ii project
Contributors to CSTAR II Project
  • Thomas Niziol, (MIC) WFO at Buffalo
  • Bob LaPlante, (SOO) WFO at Cleveland
  • Steven Zubrick, (SOO) WFO at Sterling
  • Dr. Lance Bosart, University at Albany
  • Dr. Daniel Keyer, University at Albany
  • Warren Snyder, (SOO) WFO at Albany
slide4
Data
  • Surface and Upper Air Data (SPC)
  • Soundings from SPC archive
  • 40-km RUC, 80 km ETA grids
  • Satellite imagery
  • Radar data (High resolution KENX Archive Level IV)
background august 9 2001 event
Background August 9, 2001 Event
  • A hot and very humid air mass was in place over NY and New England
  • Surface temps ranging from 32˚C to 37˚C (Syracuse high temp of 100˚F <ASOS>)
  • Surface dewpoints 20-25˚C coupled with large values of surface based CAPE (exceeding 2000 J/kg)
  • Numerous reports of straight line wind damage (60 to 80 mph) in the Mohawk Valley and hail to the size of hen eggs (2 inches or 5.1 cm)
storm reports across northeast
Storm Reports across Northeast
  • NY-VT-NH-ME
  • 21 Wind Reports
  • 2 Hail Reports
slide10

9 AUG 2001/1200 UTC 850 hPa Raob Heights,

Temps, Dewpoints and Isotachs

www.spc.noaa.gov

lake ontario sst s
Lake Ontario SST’s

http://marine.rutgers.edu/mrs/sat_data/

slide18

ETA: 9 August 2001/1200 UTC Initial Analysis

MSLP (hPa) Solid lines and 1000-500 (hPa) thickness dashed

500 hPa Heights (dam) solid lines and Absolute Vorticity (10x-5s-1) shaded

slide19

ETA: 9 August 2001/1200 UTC Initial Analysis

850 hPa Heights (dam) solid lines, and Theta-e (K) dashed and shaded (every 5K)

250 hPa Heights (dam) Solid lines and Isotachs (m s-1) shaded

slide20

ETA: 9 AUG 2001/1200 UTC Initial Analysis

500 hPa Vorticity Advection (x10-10 s-1) shaded and Heights (dam) solid lines

250 hPa Heights (dam) solid lines and Isotachs (m s-1) shaded

slide22

ETA: 9 August 2001/1200 UTC 6-hour Forecast for 18 UTC

MSLP (hPa) Solid lines and 1000-500 (hPa) thickness dashed

500 hPa Heights (dam) solid lines and Absolute Vorticity (10x-5s-1) shaded

slide23

ETA: 9 August 2001/1200 UTC 6-hour Forecast for 18 UTC

850 hPa Heights (dam) solid lines, and Theta-e (K) dashed and shaded (every 5K)

250 hPa Heights (dam) Solid lines and Isotachs (m s-1) shaded

slide24

ETA: 9 AUG 2001/1200 UTC 6- hr forecast for 1800 UTC

700 hPa Heights (m) solid lines and omega (microbars/second); Warm colors indicate ascent and cool colors descent

850 hPa Winds (kts), 850-500 hPa lapse rates (°C) and theta-e (K) shaded

slide25

ETA: 9 August 2001/1200 UTC 12-hour Forecast for 00 UTC

MSLP (hPa) Solid lines and 1000-500 (hPa) thickness dashed

500 hPa Heights (dam) solid lines and Absolute Vorticity (10x-5s-1) shaded

slide26

ETA: 9 August 2001/1200 UTC 12-hour Forecast for 0000 UTC

850 hPa Heights (dam) solid lines, and Theta-e (K) dashed and shaded (every 5K)

250 hPa Heights (dam) Solid lines and Isotachs (m s-1) shaded

40 km ruc analyses

40 km RUC Analyses

9 AUG 2001/1500-2200 UTC

slide33

RUC: 9 August 2001/1500 UTC Analysis

2-meter Temps (˚C) Solid lines shaded 32˚C and greater and 10 meter winds (knots)

2-meter Dewpoints (˚C) and 10 meter winds (knots)

slide34

RUC: 9 August 2001/1600 UTC Analysis

2-meter Temps (˚C) Solid lines shaded 32˚C (every 2)and greater and 10 meter winds (knots)

2-meter Dewpoints (˚C) and 10 meter winds (knots)

slide35

RUC: 9 August 2001/1700 UTC Analysis

2-meter Temps (˚C) Solid lines shaded 32˚C (every 2)and greater and 10 meter winds (knots)

2-meter Dewpoints (˚C) and 10 meter winds (knots)

slide36

RUC: 9 August 2001/1800 UTC Analysis

2-meter Temps (˚C) Solid lines shaded 32˚C (every 2)and greater and 10 meter winds (knots)

2-meter Dewpoints (˚C) and 10 meter winds (knots)

slide37

RUC: 9 August 2001/1800 UTC Analysis

MSLP (hPa) Solid lines and 1000-500 hPa thickness (dam)

Pressure tendency (mb/hour)

slide38

RUC: 9 August 2001/1900 UTC Analysis

2-meter Temps (˚C) Solid lines shaded 32˚C (every 2)and greater and 10 meter winds (knots)

2-meter Dewpoints (˚C) and 10 meter winds (knots)

slide39

RUC: 9 August 2001/2000 UTC Analysis

2-meter Temps (˚C) Solid lines shaded 32˚C (every 2)and greater and 10 meter winds (knots)

2-meter Dewpoints (˚C) and 10 meter winds (knots)

slide40

RUC: 9 August 2001/2100 UTC Analysis

2-meter Temps (˚C) Solid lines shaded 32˚C (every 2)and greater and 10 meter winds (knots)

2-meter Dewpoints (˚C) and 10 meter winds (knots)

slide43

RUC: 9 August 2001/2200 UTC Analysis

2-meter Temps (˚C) Solid lines shaded 32˚C (every 2)and greater and 10 meter winds (knots)

2-meter Dewpoints (˚C) and 10 meter winds (knots)

kenx radar analysis highlights of the severe weather event across new york and western new england

KENX Radar Analysis Highlights of the Severe Weather Event across New York and Western New England

slide51

2156 UTC KENX COMP REF

2156 UTC KENX Echo Tops

slide52

2156 UTC KENX VIL Product

2156 UTC KENX 0.5° Velocity

slide56

2258 UTC KENX 0.5° Base REF

2258 UTC KENX 0.5°Velocity

preliminary results
Preliminary Results
  • Lake breeze boundary from Lake Ontario sparked a cluster of well-organized severe thunderstorms, some of which were supercellular (marginal shear)
  • Boundary interacted with a hot, humid and unstable air mass and continued over a large area
  • 850 hPa theta-e values advected into central and eastern NY in excess of 350K
  • Surface based CAPE values well in excess of 2000 J/kg (as high as possibly 5000 J/kg) provided plenty instability and surface dewpoints in excess of 21°C an incredible amount of moisture
future work
Future Work
  • To further explore mesoscale observational and model data (10-km ETA and 20-km RUC)
  • Create cross-sections of the evolution and movement of the lake breeze boundary
  • To compare this case with other possible Lake Ontario and Lake Erie cases