1 / 38

Aspects of the May 13/14 th northern high plains Derecho

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.

luther
Download Presentation

Aspects of the May 13/14 th northern high plains Derecho

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Aspects of the May 13/14th northern high plains Derecho Jeffry S. Evans Storm Prediction Center 10/10/07

  2. 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.

  3. Quick 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.

  4. GOES-W IR12z (5/13) – 08z (5/14)

  5. SHR- 45G55 0145z

  6. BYG- 40G54 0232z

  7. RAWS site M60 mph 0350z

  8. E60 mph 0430z

  9. RAP- 35G48 0652z

  10. Environment

  11. 21z

  12. 23z

  13. 01z

  14. 03z

  15. 2153z BIL 04020G26 2150z

  16. 2223z

  17. 2253z

  18. 2323z

  19. 2340z BIL PK WND 36043 2353z

  20. 0030z

  21. 0053z

  22. 0123z

  23. 0148z SHR 31037G52 0153z SHR 31045G55 0150z

  24. Conclusions/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?

  25. Conclusions/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?

  26. The End

More Related