20Z 23 MAY 2011 Surface Plot with Boundaries
There are several less-challenging boundaries found on this chart. A dryline extends from western OK into western TX with dry air to the west and humid air to the east. The wind shift across this dryline is weak but the dewpoint difference clearly defines its location.
A weak trough extends from southeastern CO, across the OK panhandle, through KS into IA. The themal difference across this boundary is minimal, but there is a weak moisture drop from east to west. The wind shift is sufficient to help locate this boundary.
The major challenge is found in northeastern OK, northern AR and southern MO. Both radar and satellite imagery show thunderstorms along the AR/MO border. Surface data show cool-pool air across this area. Using the model of a bubble high pressure center with winds flowing outward from the high center toward the outflow boundary, you can see two distinct boundaries as depicted in the Image below.