aspects of the may 13/14 th northern high plains derecho
DESCRIPTION
Aspects of the May 13/14 th northern high plains Derecho. Jeffry S. Evans Storm Prediction Center. 10/10/07. Overview. Derecho-producing MCS- 66 severe wind reports/wind damage along with 6 significant wind reports measured up to 75 mph. - PowerPoint PPT PresentationTRANSCRIPT
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Aspects of the May 13/14th northern high plains Derecho
Jeffry S. Evans
Storm Prediction Center
10/10/07
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Overview
• Derecho-producing MCS- 66 severe wind reports/wind damage along with 6 significant wind reports measured up to 75 mph.
• Severe and near severe winds extended swd for nearly 100 mi south of main convection.
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Quick OverviewQuick Overview
• Strong, progressive shortwave trough moving across nrn Rockies.
• E-W surface cold front moving swd across ern MT through the day.
• Moderate instability and strong effective bulk-shear develop ahead of and just behind front.– Low and deep layer shear strengthens in E-
NE surface flow behind front.
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GOES-W IR12z (5/13) – 08z (5/14)
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SHR- 45G55 0145z
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BYG- 40G54 0232z
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RAWS site M60 mph 0350z
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E60 mph 0430z
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RAP- 35G48 0652z
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Environment
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21z
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23z
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01z
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03z
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2150z
2153z BIL 04020G26
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2223z
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2253z
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2323z
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2353z
2340z BIL PK WND 36043
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0030z
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0053z
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0123z
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0148z SHR 31037G520153z SHR 31045G55
0150z
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Conclusions/QuestionsConclusions/Questions
• Appears convective cold pool enhanced cold front, surging front ssewd.
• Strong capping limited new thunderstorm development into MT, but not into ND.
• Measured wind gusts were amplified along eastern slopes of Big Horn mountains and Black Hills.– Blocking effect enhanced frontal surge?
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Conclusions/QuestionsConclusions/Questions
• WFOs Billings and Riverton both addressed wind threat with short term forecasts.
• WFO Rapid City used severe thunderstorm warnings.
• How should the NWS handle these events with current product suite?
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The EndThe End