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Team 1

Team 1. Bryan Guarente And Katie Roussy 3/31/05. Discussion. 500mb Vorticity Advection in relation to clouds:

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  1. Team 1 Bryan Guarente And Katie Roussy 3/31/05

  2. Discussion 500mb Vorticity Advection in relation to clouds: Areas of positive vorticity advection correspond to areas of cloudiness. However, in areas where you may be having frontal forcing, negative vorticity advection can still be present and clouds will still be forming due to the forcing of the front. At 00z, in WI, there is an area of negative vorticity advection that corresponds to a cloudy area. This is because QG theory has neglected fronts. At 12z, there is an area of negative vorticity advection over the MCS over the southeast, but there is still obviously cloud coverage. This is again due to fronts not being included in QG theory. The clouds over the Gulf of Mexico are associated with Inertial Instability Bands which are associated with Jetstreaks. Since QG theory also neglects jetstreaks, then these clouds will not correspond to areas of PVA.

  3. Discussion 850mb Thermal Advection in relation to clouds: At 00z, the cold air advection pattern in the dry slot of the mid-latitude cyclone corresponds well to clear skies. The warm air advection pattern over the great lakes region also corresponds to upward motion and clouds. So, temperature advection in lieu of fronts, matches up well with cloud coverage. There are however areas on these maps (both 00z and 12z) that do not correspond well with cloud coverage. The main areas that this does not correspond well along the Gulf Coast and around Brownsville, TX. We are not sure why these areas do not correspond to cloud coverage despite the warm air advection patterns. Over the MCS in the southeast, there are no advection patterns but this is all frontal related, so QG theory has thrown the baby out with the bathwater in this case. On the 00z map there is also an area of cold air advection that has cloud cover over CO. This cold air advection is actually at the surface in Denver if not underground farther to the west, so this will have little to no effect on the cloud coverage in this area.

  4. Discussion 500mb Vorticity Advection in relation to precipitation: At 00z, the precipitation area along the cold front is not likely related to the vorticity advection. In IL, KY, and TN, the positive vorticity advection pattern is actually zero along the cloud line. The precipitation is in front of the greatest area of positive vorticity advection. It seems in most areas that the advection pattern has no correlation to the precipitation pattern. The reason we say most areas, is because in KS, there is an area where vorticity advection has caused precipitation, but this is because there is very little frontal structure on this low pressure system. Baroclinic effects are not yet maximized in this area. At 12z, the same patterns hold true.

  5. Discussion 850mb Thermal Advection in relation to precipitation: Areas of precipitation have no correlation to areas of thermal advection. Precipitation like the area in the southeast is frontally generated, thus ignored by QG theory. There were no areas of thermal advection that actually corresponded to precipitation on the map.

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