Patterns on Weather Maps

Surface Weather Map

Surface Weather Map, 15 UTC 22 March 2011

1. What is the date and time of this map, in Central Standard Time? (10 pts)

2. Examine the weather information for the region bounded by the box, particularly for the weather sations in the southeastern third (indicated by the letter A), the northwestern third (indicated by the letter B) and northeastern third (indicated by the letter C). Indicate if the temperatures are relatively warm (>60) or cold (<45) by putting a large red "W" or large blue "C" in the three regions. (20 pts)

3. Examine the dew point temperatures in the same regions. Indicate whether the three regions have relatively high (dew point temperatures>50F) mixing ratios ("M" = moist) with a green "M" or relatively low (dew point temperatures <40F) mixing ratios ("D"=dry) with a brwon "D" for the the three regions. (20 pts)

4. Sketch approximate streamlines (as discussed in class) to show the sense of the wind flow in the box, but color the streamlines red if they are in the warm region (from question 2) and blue if they are in the cold region. (10 pts)

5. Draw a large black "X"to indicate the center of circulation, as explained in class. (10 pts)


6. Examine the visibile and infrared satellite images given above, which are roughly for the same time as the surface weather map.

(a) In which of the regions (A,B and/or C) do the clouds appear likely to be either towering (e.g., cumulonimbus) or vertically-layered (e.g., nimbostratus) and how did you tell? (10 pts)

(b) Describe how the cloud patterns in the southern half of the images related to your answer in (3) above. (10 pts)

7. In what areas do the cloud patterns appear NOT to correspond to the moist and dry areas you found in (3) above. (In other words, you might expect clouds to be where the moistest air is. But there are inconsistencies. Where are those inconsistencies?) (10 pts)