tulsa, ok heavy rain event
DESCRIPTION
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 - PowerPoint PPT PresentationTRANSCRIPT
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• 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.
May 5 @ 2100 UTC Surface Plot
Weak Isentropic Lift Present Over Event Area
Theta-E Ridge to S; Moisture Advection into TUL Area
Forcast Precipitable Water
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
Continued Isentropic Lift Forecast @ 0600 UTC
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
OUN sounding 1200 UTC 5/6/2000
12Z 24-hour rainfall ending 5/6/2000
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