| Caption: |
The weather showing surface atmospheric conditions for the United States and southern Canada on April 13, 2003. Map shows positions of surface high (H) and low (L) pressure centers, two low pressure troughs (reddish brown dashed lines extending from a LOW in Idaho and a LOW in eastern Montana), a cold front extending east from Georgia into the Atlantic Ocean (blue line with triangles), a warm front in North Dakota (red line with half circles), a stationary front in the lower Mississippi Valley (alternating cold and warm front symbols on opposite sides of the same line), an occluded front off the California coast (alternating cold and warm front symbols on the same side of a purple line), the line marking freezing temperature (curving dashed blue line), and areas of precipitation (solid green). The green contour lines show atmospheric pressure in millibars (e.g., 1016). (Courtesy of the National Weather Service) |
| Keywords: |
atmosphere, midlatitude cyclones, middle-latitude cyclones, warm fronts, precipitation, cold fronts, precipitation, air pressures, atmospheric pressures |
