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Tulsa, OK Heavy Rain Event

Tulsa, OK Heavy Rain Event. May 5 – May 6, 2000. John LaGue & Mike Boehmke. Pre-Event Conditions. Weak mid- to upper-level cyclonic circulation Ongoing convection near area of interest

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Tulsa, OK Heavy Rain Event

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  1. Tulsa, OK Heavy Rain Event May 5 – May 6, 2000 John LaGue & Mike Boehmke

  2. Pre-Event Conditions • Weak mid- to upper-level cyclonic circulation • Ongoing convection near area of interest • Lack of well-defined surface boundary, but plenty of available low-level moisture and outflow boundaries • Mid-60s dewpoints over event area; low-70s dewpoints in southern Oklahoma • Somewhat increased afternoon surface heating in area of interest helped lead to initial evening development in Tulsa area.

  3. May 5 @ 2100 UTC Surface Plot

  4. Weak Isentropic Lift Present Over Event Area

  5. Theta-E Ridge to S; Moisture Advection into TUL Area

  6. Forcast Precipitable Water

  7. More Favorable Conditions by 0600 UTC • Increase in strength of low-level jet • Continued advection of warmer air and higher Theta-E air into TUL area as shown by RUC initializations • Continued thunderstorm development near center of mid- to upper-level circulation • Rainfall coverage and intensity rapidly increases after 0800 UTC • Note the area of regeneration just NW of TUL

  8. Continued Isentropic Lift Forecast @ 0600 UTC

  9. 1200 UTC Conditions • Increased low-level jet • Low-level jet veers from 0600 UTC • Mid- to upper-level circulation begins to move northeast • Mid-level dry intrusion evident on OUN sounding

  10. OUN sounding 1200 UTC 5/6/2000

  11. 12Z 24-hour rainfall ending 5/6/2000

  12. TULSA 9WNW - 6.81 TULSA 16SW - 6.26 HEYBURN DAM - 6.32 TULSA 7SSE - 5.71 TULSA 6SSW - 5.55 TULSA 5SSW - 5.48 TULSA 11SW - 5.20 TULSA 9SSE - 5.08 TULSA 4SW - 4.61 MANNFORD 6NW - 4.60 Tulsa Area 24-Hour Gage Totals( > 4.5”)

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