# Patterns on Weather Maps

Surface Weather Map, 15 UTC 22 March 2011

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

0900 AM CST or 1000 AM CDT.

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.

See map above.

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.

See map above.

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.

See map above.

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

See map above.

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?

The clouds appeared towering or vertically-layered in Region A and the northern part of Region C.

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

It appears that the moistest air (in terms of high dew point temperature) does correspond to the region in which we'd suspect precipitating cloud systems.

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?)

The clouds in Regions B and C seem to be associated with low dew point temperatures and not as much water vapor. That seems, at first glance, to be inconsistent.