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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.

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Presentation on theme: "The August 9, 2001 Lake Breeze Severe Weather Event Across New York and Western New England Thomas A. Wasula NOAA/NWS WFO at Albany."— Presentation transcript:

1 The August 9, 2001 Lake Breeze Severe Weather Event Across New York and Western New England Thomas A. Wasula NOAA/NWS WFO at Albany

2 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)

3 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

4 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)

5 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 )  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)

6 Severe Weather Reports

7 Storm Reports across Northeast NY-VT-NH-ME 21 Wind Reports 2 Hail Reports

8

9 9 AUG 2001/1200 UTC 500 hPa Raob Heights, Temps and Isotachs www.spc.noaa.gov

10 9 AUG 2001/1200 UTC 850 hPa Raob Heights, Temps, Dewpoints and Isotachs www.spc.noaa.gov

11 9 AUG 2001/1200 UTC 250 hPa Raob Heights, Temps and Isotachs

12 9 AUG 2001/1200 UTC ALB Sounding www.spc.noaa.gov

13 9 AUG 2001/1200 UTC BUF Sounding www.spc.noaa.gov

14 10 AUG 2001/0000 UTC BUF Sounding www.spc.noaa.gov

15 10 AUG 2001/0000 UTC ALB Sounding www.spc.noaa.gov

16 Lake Ontario SST’s http://marine.rutgers.edu/mrs/sat_data/

17 SPC1300 UTC and 1630 UTC DAY 1

18 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 -5 s -1 ) shaded

19 ETA: 9 August 2001/1200 UTC Initial Analysis 250 hPa Heights (dam) Solid lines and Isotachs (m s -1 ) shaded 850 hPa Heights (dam) solid lines, and Theta-e (K) dashed and shaded (every 5K)

20 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

21 ETA: 9 August 2001/1200 UTC 6-hr and 12-hr Forecasts for 1800 UTC and 0000 UTC

22 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 -5 s -1 ) shaded

23 ETA: 9 August 2001/1200 UTC 6-hour Forecast for 18 UTC 250 hPa Heights (dam) Solid lines and Isotachs (m s -1 ) shaded 850 hPa Heights (dam) solid lines, and Theta-e (K) dashed and shaded (every 5K)

24 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

25 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 -5 s -1 ) shaded

26 ETA: 9 August 2001/1200 UTC 12-hour Forecast for 0000 UTC 250 hPa Heights (dam) Solid lines and Isotachs (m s -1 ) shaded 850 hPa Heights (dam) solid lines, and Theta-e (K) dashed and shaded (every 5K)

27 1500 UTC 9 AUG 2001 Surface Analysis

28 1745 UTC 9 AUG 2001 Visible Satellite

29 1800 UTC 9 AUG 2001 Surface Analysis

30 1845 UTC 9 AUG 2001 Visible Satellite

31 2215 UTC 9 AUG 2001 Visible Satellite

32 40 km RUC Analyses 9 AUG 2001/1500-2200 UTC

33 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)

34 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)

35 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)

36 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)

37 RUC: 9 August 2001/1800 UTC Analysis MSLP (hPa) Solid lines and 1000- 500 hPa thickness (dam) Pressure tendency (mb/hour)

38 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)

39 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)

40 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)

41 2100 UTC 9 AUG 2001 Surface Analysis

42 AUG 9 2001 2100 UTC Surface Analysis with Radar and Satellite www.unisys.com

43 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)

44 0000 UTC 10 AUG 2001 Surface Analysis

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

46 1958 UTC KENX 0.5° Base Reflectivity

47 2100 UTC KENX 0.5° Base Reflectivity

48 2142 UTC KENX VIL Product

49 2141 UTC KENX Comp Ref X-Section Herkimer Co. Storm

50 2146 UTC KENX 0.5° SRM and MESO Product

51 2156 UTC KENX COMP REF2156 UTC KENX Echo Tops

52 2156 UTC KENX VIL Product2156 UTC KENX 0.5° Velocity

53 2156 UTC KENX Comp Ref X-Section Herkimer Co. Storm

54 2202 UTC KENX VIL Product VIL=80 kg/m^ 2

55 2212 UTC KENX 0.5° SRM and MESO Product

56 2258 UTC KENX 0.5° Base REF2258 UTC KENX 0.5° Velocity

57 0000 UTC KENX 0.5° Base REF2354 UTC KENX VWP

58 0057 UTC KENX 0.5° Base Reflectivity

59 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

60 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

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