2009 Christmas Eve Blizzard . Lamont Bain OWL Director of Operations Chairperson for the Committee on Adverse Weather OWL Winter Weather Workshop . Source: Marlow Review . Case Study Outline. Upper Air/Surface Maps Norman, OK and Springfield, MO RAOBs “Noteworthy” mesoscale features
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2009 Christmas Eve Blizzard
OWL Director of Operations
Chairperson for the Committee on Adverse Weather
OWL Winter Weather Workshop
Source: Marlow Review
Upper trough becoming more negatively tilted
500 mb closed low
Strong thermal gradient
Strong 850 mbbaroclinic zone
WARM ADVECTION WILL PERSIST FROM ABOUT 850-700 MB...BUT VERTICAL MOTION WITH THE DEEPENING SYSTEM WILL HELP TO OFFSET ACTUAL WARMING. SUFFICIENT BUT NOT STRONG DEEP FRONTOGENETICAL FORCING WILL ALSO TRANSLATE EWD ACROSS THE TX PANHANDLE AND WRN OK AS TEMPERATURES COOL DURING THE DAY. AREAS ALONG I-35 IN OK CAN EXPECT RAIN EARLY...MIXING WITH ICE PELLETS TOWARDS MID MORNING...AND BECOMING ALL SNOW BY 18Z. AT THAT TIME...1 IN/HR RATES MAY OCCUR. W OF I-44...MIXED PRECIPITATION WILL CHANGE TO ALL SNOW BY AROUND 15Z WITH OVER 1 IN/HR SNOWFALLS RATES. STRONG NWLY WINDS GUSTING OVER 40 MPH WILL RESULT IN VERY LOW VISIBILITY IN HEAVY SNOW WITH BLIZZARD CONDITIONS AT TIMES OVER WRN OK AND NW TX.
Wintry precipitation & stiffening SFC pressure gradient
Deepening SFC low
Heaviest precipitation along I-35 corridor
Dry air intrusion