30 May 2006 Severe Weather

 

An unexpected severe weather event occurred on 30 May 2006.  The low-level features were very weak and subtle, but there was a weak upper system tracking southeast out of Canada.  It was quite a widespread severe weather event for not being outlooked or forecasted. 

 

This was an anomalous event for many reasons.  The features that came together to produce the severe thunderstorms were somewhat subtle, but combined, provided for a rather active day.  There was an upper level ridge in place across the Ohio Valley and Great Lakes Region, with weak northwest flow aloft across Eastern New York and Western New England.  At the surface, a back door cold front was stationary at this time, oriented north to south across Western New England.  High pressure was positioned just off the Gulf of Maine coast.  Also, early morning stratus/fog left some differential heating boundaries, especially in the vicinity of the mountain/valley regions.  A very warm and humid air mass was in place for the end of May.  Temps soared into the upper 80s with dewpoints in the mid to upper 60s by early afternoon.  A capping inversion around 5000 feet was broken across the Adirondacks, as there was just enough lift from heating over the mountains, the aforementioned back door front near the area, as well as a weak short wave trough moving southeast into this area during peak heating.  The result was explosive development of thunderstorms that quickly became severe, despite the weak deep layer wind shear.  The reason for such robust convection was that surface-based CAPE values were able to reach the 2000-3000 J/Kg range.  Once storms rapidly developed across the higher terrain of the Adirondacks, they organized into and MCS due to cold pool formation in the weak flow regime.  This MCS was long lived and propagated southward through the entire area.

 

The visible satellite pictures give a sense for how the convection developed and tracked out of the Adirondacks (Fig 1).

 

 

Figure 1.  Visible satellite pictures with lightning overlay from 1800 UTC through 2000 UTC 30 May.  Click on figure for movie showing the evolution of the convection.

 

The radar imagery shows how widespread the convection became, and how it consolidated as it tracked southeast.  The Base Reflectivity (Fig. 2), Base Velocity (Fig. 3), Storm Relative Velocity (Fig. 4) and Reflectivity Cross Section (Fig 5) of one of the storms that produced large hail, clearly illustrate the widespread nature to the convection and the variety of severe weather that occurred.  The severe weather reports are shown in figure 6.  This featured storm produced a “wall of wind” that went through Southern Hamilton and Eastern Fulton Counties, with widespread wind speeds of 70-80 mph.  Numerous large trees were blown down along the western shore of Sacandaga Lake.  This could be classified as a macroburst.

 

 

Figure 2.  Four-panel of Base Reflectivity from KENX at the 0.5° (upper left), 0.9° (upper right), 1.3° (lower right), and 1.8° (lower left) elevation angles.  Click on figure for movie showing evolution of the Base Reflectivity 1922 UTC to 1953 UTC 30 May.

 

 

Figure 3. Four-panel of Storm Relative Velocity from KENX at the 0.5° (upper left), 0.9° (upper right), 1.3° (lower right), and 1.8° (lower left) elevation angles. 

 

 

 

Figure 4. Four-panel of Base Velocity from KENX at the 0.5° (upper left), 0.9° (upper right), 1.3° (lower right), and 1.8° (lower left) elevation angles.  Click on figure for movie showing evolution of the Base Velocity 1945 UTC to 1957 UTC 30 May.

 

 

 

Figure 5.  Reflectivity Cross Section from KENX at 2145 UTC 30 May.

 

Map of 060530_rpts's severe weather reports

 

New York

 

Location or County

Date

Time

Type

Mag

Dth

Inj

PrD

CrD

1 Port Leyden

05/30/2006

01:00 PM

Hail

0.75 in.

0

0

2K

0

2 Schroon Lake

05/30/2006

01:10 PM

Hail

1.75 in.

0

0

0

0

3 Schroon Lake

05/30/2006

01:10 PM

Tstm Wind

55 kts.

0

0

50K

0

4 Hubbardsville

05/30/2006

01:20 PM

Hail

0.75 in.

0

0

0

0

5 Pottersville

05/30/2006

01:20 PM

Tstm Wind

60 kts.

0

0

0

0

6 Wells

05/30/2006

01:20 PM

Hail

0.75 in.

0

0

0

0

7 Arietta

05/30/2006

01:30 PM

Tstm Wind

60 kts.

0

0

0

0

8 Lake Pleasant

05/30/2006

01:30 PM

Tstm Wind

60 kts.

0

0

0

0

9 Wells

05/30/2006

01:30 PM

Tstm Wind

60 kts.

0

0

0

0

10 Boonville

05/30/2006

01:45 PM

Hail

0.75 in.

0

0

0

0

11 Schroon Lake

05/30/2006

01:45 PM

Flash Flood

N/A

0

0

100K

0

12 Columbus

05/30/2006

02:10 PM

Hail

0.75 in.

0

0

0

0

13 Warrensburg

05/30/2006

02:20 PM

Tstm Wind

60 kts.

0

0

0

0

14 Wells

05/30/2006

02:45 PM

Tstm Wind

60 kts.

0

0

0

0

15 Caroga Lake

05/30/2006

02:55 PM

Hail

0.75 in.

0

0

0

0

16 Caroga Lake

05/30/2006

03:00 PM

Hail

0.88 in.

0

0

0

0

17 Gloversville

05/30/2006

03:05 PM

Tstm Wind

60 kts.

0

0

0

0

18 Mayfield

05/30/2006

03:05 PM

Tstm Wind

60 kts.

0

0

0

0

19 Bridgewater

05/30/2006

03:06 PM

Hail

1.00 in.

0

0

0

0

20 Galway

05/30/2006

03:30 PM

Tstm Wind

60 kts.

0

0

0

0

21 Richfield Spgs

05/30/2006

03:30 PM

Tstm Wind

50 kts.

0

0

20K

0

22 Ames

05/30/2006

03:33 PM

Hail

0.75 in.

0

0

0

0

23 Long Lake

05/30/2006

03:35 PM

Hail

0.75 in.

0

0

0

0

24 Schenectady

05/30/2006

03:45 PM

Tstm Wind

60 kts.

0

0

0

0

25 Carlisle

05/30/2006

04:07 PM

Tstm Wind

60 kts.

0

0

0

0

26 Berne

05/30/2006

04:25 PM

Tstm Wind

60 kts.

0

0

0

0

27 Monticello

05/30/2006

04:30 PM

Hail

0.88 in.

0

0

0

0

28 North Blenheim

05/30/2006

04:35 PM

Tstm Wind

60 kts.

0

0

0

0

29 Climax

05/30/2006

04:40 PM

Tstm Wind

60 kts.

0

0

0

0

30 Fleischmanns

05/30/2006

05:00 PM

Tstm Wind

50 kts.

0

0

0

0

31 Mt Vision

05/30/2006

05:00 PM

Tstm Wind

50 kts.

0

0

0

0

32 Unadilla

05/30/2006

05:05 PM

Tstm Wind

50 kts.

0

0

0

0

33 Endwell

05/30/2006

05:25 PM

Hail

0.88 in.

0

0

0

0

34 Endwell

05/30/2006

05:25 PM

Tstm Wind

50 kts.

0

0

0

0

35 Maine

05/30/2006

05:25 PM

Hail

1.00 in.

0

0

0

0

36 Phoenicia

05/30/2006

05:25 PM

Tstm Wind

60 kts.

0

0

0

0

37 Halcott Center

05/30/2006

05:30 PM

Tstm Wind

60 kts.

0

0

0

0

38 Walton

05/30/2006

05:30 PM

Hail

0.88 in.

0

0

0

0

39 Endwell

05/30/2006

05:32 PM

Hail

0.75 in.

0

0

0

0

40 Downsville

05/30/2006

05:52 PM

Tstm Wind

72 kts.

0

0

0

0

41 Canisteo

05/30/2006

06:25 PM

Tstm Wind

50 kts.

0

0

5K

0

42 Woodhull

05/30/2006

06:30 PM

Tstm Wind

50 kts.

0

0

5K

0

43 Woodhull

05/30/2006

07:20 PM

Flash Flood

N/A

0

0

10K

0

44 Troupsburg

05/30/2006

07:30 PM

Flash Flood

N/A

0

0

10K

0

45 North Creek

05/31/2006

02:10 PM

Hail

1.00 in.

0

0

0

0

46 North Creek

05/31/2006

02:10 PM

Tstm Wind

60 kts.

0

0

0

0

47 Chestertown

05/31/2006

02:30 PM

Hail

0.88 in.

0

0

0

0

48 Spencer

05/31/2006

03:52 PM

Tstm Wind

50 kts.

0

0

2K

0

49 Indian Lake

05/31/2006

03:53 PM

Hail

0.75 in.

0

0

0

0

50 Indian Lake

05/31/2006

04:00 PM

Hail

1.00 in.

0

0

0

0

51 South Edmeston

05/31/2006

04:05 PM

Tstm Wind

50 kts.

0

0

5K

0

52 Wellsburg

05/31/2006

04:35 PM

Flash Flood

N/A

0

0

0

0

53 Smyrna

05/31/2006

04:40 PM

Tstm Wind

50 kts.

0

0

0

0

54 Hamilton

05/31/2006

04:45 PM

Tstm Wind

50 kts.

0

0

5K

0

55 Lounsberry

05/31/2006

04:51 PM

Tstm Wind

50 kts.

0

0

10K

0

56 Van Hornesville

05/31/2006

04:55 PM

Hail

0.75 in.

0

0

0

0

57 St Johnsville

05/31/2006

05:25 PM

Hail

0.75 in.

0

0

0

0

58 Cooperstown

05/31/2006

05:30 PM

Hail

0.75 in.

0

0

0

0

59 Caroga Lake

05/31/2006

05:45 PM

Hail

0.88 in.

0

0

0

0

60 Woodhull

05/31/2006

07:00 PM

Lightning

N/A

0

0

10K

0

61 East Greenbush

05/31/2006

07:02 PM

Tstm Wind

60 kts.

0

0

0

0

62 Bolivar

05/31/2006

07:10 PM

Tstm Wind

50 kts.

0

0

5K

0

63 La Fayette

05/31/2006

07:10 PM

Hail

0.75 in.

0

0

0

0

64 La Fayette

05/31/2006

07:20 PM

Hail

0.88 in.

0

0

0

0

65 Addison

05/31/2006

08:45 PM

Tstm Wind

50 kts.

0

0

5K

0

66 Addison

05/31/2006

09:00 PM

Flash Flood

N/A

0

0

10K

0

67 Cohocton

05/31/2006

09:00 PM

Lightning

N/A

0

0

10K

0

68 Gang Mills

05/31/2006

10:00 PM

Tstm Wind

50 kts.

0

0

0

0

69 Plattsburgh

05/31/2006

12:40 PM

Hail

0.88 in.

0

0

0

0

TOTALS:

0

0

264K

0

Vermont

Location or County

Date

Time

Type

Mag

Dth

Inj

PrD

CrD

1 Bennington

05/30/2006

04:42 PM

Tstm Wind

60 kts.

0

0

0

0

TOTALS:

0

0

0

0

 

 

Figure 6.  Severe weather reports for 30 May 2006.