1 / 31

Regional Variations in Sounding Derived Significant Severe Weather Parameters

Regional Variations in Sounding Derived Significant Severe Weather Parameters. Jeff Craven, NWS Sullivan/Milwaukee WI NWA Annual Meeting Cleveland OH, Oct 2006. Two Datasets. 0000z Soundings from across CONUS 1997-1999 (3 Years) 2100-0300z, within 100 nm of sounding

nhu
Download Presentation

Regional Variations in Sounding Derived Significant Severe Weather Parameters

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. Regional Variations in Sounding Derived Significant Severe Weather Parameters Jeff Craven, NWS Sullivan/Milwaukee WI NWA Annual Meeting Cleveland OH, Oct 2006

  2. Two Datasets • 0000z Soundings from across CONUS 1997-1999 (3 Years) • 2100-0300z, within 100 nm of sounding • 0000z Soundings from 1957-1996 that include only Significant Severe reports • 2+” Hail • 65+ knot gusts • F2+ Tornadoes

  3. Ohio Valley Datasets • Significant Severe Categories only • Individual Parameters • (Sample Size on bottom)

  4. Seasonal Definitions • Cold Season (November to April) • Warm Season (May to October) • Use Ohio Valley as example (have all of them completed)

  5. Parameter Combinations Product of MLCAPE and 0-6 km shear (Significant Severe Parameter, AKA Craven-Brooks Sig Svr) (Units in m3 s-3)

  6. 1997-1999 Database

  7. 1957-1996 Database

  8. Parameter Combinations Strong Tornado Parameter MLCAPE * 0-1 km shear * 0-6 km shear _______________________________ MLLCL height * DCAPE (Units in m s-2 acceleration?)

  9. 1997-1999 Database

  10. 1957-1996 Database

  11. Regional/Seasonal Variations • Significant Severe Categories only • Combination Parameters: • Significant Severe Parameter • Strong Tornado Parameter

  12. Summary • Some regional variation, but thresholds seem to work pretty well across the CONUS (20,000-30,000 on Sig Svr, 0.25 on Strong Tor Parm) • In general, higher combination of MLCAPE and 0-6 km shear, more intense convection is • Expected differences betweenCold (Low CAPE, High Shear)and Warm Season (High CAPE, Low Shear) severe events

More Related