Download - Tulsa, OK Heavy Rain Event
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Tulsa, OK Heavy Rain Event
May 5 – May 6, 2000
John LaGue & Mike Boehmke
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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.
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May 5 @ 2100 UTC Surface Plot
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Weak Isentropic Lift Present Over Event Area
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Theta-E Ridge to S; Moisture Advection into TUL Area
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Forcast Precipitable Water
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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 RUCinitializations
• 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
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Continued Isentropic Lift Forecast @ 0600 UTC
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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
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OUN sounding 1200 UTC 5/6/2000
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12Z 24-hour rainfall ending 5/6/2000
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Tulsa Area 24-Hour Gage Totals( > 4.5”)
• 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