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SEVERE WEATHER CLIMATOLOGY FOR THE BLACKSBURG, VA WFO COUNTY WARNING AREA Robert Stonefield and James Hudgins Update through 2007 by Kathryn Prociv National Weather Service Forecast Office Blacksburg, Virginia Informational Tidbits

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SEVERE WEATHER CLIMATOLOGY FOR THE BLACKSBURG, VA WFO COUNTY WARNING AREA

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SEVERE WEATHER CLIMATOLOGY FOR THE BLACKSBURG, VA WFO COUNTY WARNING AREA

Robert Stonefield and James Hudgins

Update through 2007 by Kathryn Prociv

National Weather Service Forecast Office

Blacksburg, Virginia


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Informational Tidbits

  • 4527 Severe Weather Events (Tornado, Hail and Wind) from 1950 to 2007.

  • Data collected from NCDC and SPC.

  • Demographics: 1.7 million people across 20,000 square miles.

  • 1.1 million people reside east of the Blue Ridge.


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Population Density by County


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All Severe Weather Events by Month

May-July 65% [2959]

22%

[979]

22%

[988]

22%

[992]

12%

[545]

10%

[433]

4527 Total Events


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All Severe Weather Events by Time

53% [2383] (2p-6p)

27%[1228]

26%[1155]

16% [713]

14%[618]

<4% [199] (2a-8a)

4527 Total Events


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Tornados by Month

56% [76] Apr-July

3% [135] of all

severe weather

events [4527]

are Tornados.

95 East

40 West

16% [22] were

tropical cyclone

induced tornados

Average 2 per year


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Tornados by Time

135 reported tornados (1950-2007)

28%

[38]

64% [87] (12p-6p)

22%

[29]

15%

[20]


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Tornados by Magnitude

135 reported tornados (1950-2007)

76% [103]

24%[32]

0%[0]

19 tornados in April, 9 were (F2-F3)!


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Tropical Tornados by County

Of the 135 tornados, 16% [22] were tropical cyclone-induced tornados

Ivan spawned Two F2

Tornados (Bedford

and Henry County)

90% [20] were F0-F1


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Severe Hail by Month

41% [1845] of all severe weather events [4527] is Severe Hail.

85% [1559] April-July

33%

[608]

24%

[435]

16%

[291]

12%[225]

1% [18] Oct.-Feb.

0%

[0]


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Severe Hail by Time

1845 Severe Hail Events

30%

[558]

29%

[537]

88% [1628] (12p-8p)

15%

[283]

13%

[250]

59% [1095] (2p-6p)


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Severe Hail by Magnitude

81%[1500]

17%[311]

2%[34]

1845 Severe Hail Events


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Severe Winds by Month

56% [2547] of all severe weather events [4527] is Severe Winds.

77% [1959] May-Aug.

27%

[679]

21%

[534]

15%

[391]

14%

[355]


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Severe Winds by Time

2547 Severe Wind Events

25%

[632]

23%

[589]

78% [1989] (12p-8p)

17%

[420]

14%

[348]

48% [1221] (2p-6p)


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Highlights

  • If a storm does become severe, 56% of the events are from convective winds, 41% are from hail, and 3% are tornados, of which, 16% are from tropical systems.

  • Tornados that touch down in the WFO Blacksburg CWA are generally east of the Blue Ridge and near the North Carolina and Virginia border.

  • Tornados developing within the WFO Blacksburg CWA usually occur between the months of April and July.

  • On average, two tornados touch down within the WFO Blacksburg CWA per year.

  • The majority (72%) of the tornados occur between 12:00 pm and 8:00 pm with a diurnal peak between 2:00 pm and 6:00 pm.

  • Weak tornados account for 76% of all the tornado events.

  • Of the strong tornados (24%), most occur during the month of April.

  • No violent tornados have been reported within the CWA.

  • 90% of the tropical cyclone-induced tornados are weak tornados. Ivan spawned two F2 tornados (Bedford and Henry County on September 17, 2004).


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Highlights Continued

  • Severe hail occurs most often between the months of April and July (85%), with a seasonal peak in May.

  • The majority (88%) of severe hail occurs between 12:00 pm and 8:00 pm with a diurnal peak between 2:00 pm and 6:00 pm.

  • Severe hail of 0.75 to 1.00 inch constitutes 81% of all severe hail reports.

  • Severe thunderstorm wind events are most likely to occur between the months of May and August (77%), with a seasonal peak in July.

  • The majority (78%) of severe thunderstorm damaging winds occur between 12:00 pm and 8:00 pm, with a diurnal peak between 2:00 pm and 6:00 pm.

SEVERE WEATHER CLIMATOLOGY PAPER FOR THE RNK (1950-2005:

http://www.erh.noaa.gov/rnk/Research/Svr_Wx_Climo.pdf

OTHER LOCAL CLIMATE STUDIES:

http://www.weather.gov/climate/local_data.php?wfo=rnk

THE END


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