WW2010
University of Illinois

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NOTE: We've guessed that you're not using a client that supports colored tables and have tried to compensate. Low graphics mode looks much better on clients that do... we recommend switching to Netscape 3.0 or Microsoft Internet Explorer.
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Surface 3 Hour Temperature and Wind Change
surface analysis pairs


Example Surface 3 Hour Temperature and Wind Change


This is the Surface 3 Hour Temperature and Wind Change image, and on this image are areas of 3 hour positive and negative temperature change, plus 3 hour wind changes. This images is useful for locating the position of fronts

Positive temperature change areas are contoured in solid yellow lines and indicate that the temperature is rising in that region. Negative temperature change areas are contoured in dashed yellow lines and indicate that the temperature is falling in that region. Both temperature change areas are contoured in intervals of 5 degrees Fahrenheit. Therefore, a positive temperature change contour of 5 would indicate that the temperature has risen by 5 degrees Fahrenheit in the past 3 hours within that contour.

The 3 hour wind change is represented by wind vectors in units of meters per second, as indicated by the length of each wind vector. The wind vectors also show the change in wind direction during the past 3 hours, as indicated by the direction the arrow is pointing. The length and magnitude of the strongest wind vector is shown in the lower right-hand corner.


This image is useful to locate the position of fronts since fronts are boundaries of different air masses, and for warm and cold fronts the air masses have different temperature characteristics. Since there is typically warm advection ahead of a cold front and behind a warm front, positive temperature change regions could be found there. Also, since there is typically cold advection behind a cold front, negative temperature change regions could be found there.

The 3 hour wind change can help show the location of fronts, since one characteristic of both cold and warm fronts is a change in wind direction across the front.

The example image above shows an area of negative temperature change and an increase in the westerly winds located in Iowa. Both of these features are indications that a cold front has passed through the area.



3hr dew pt & wind
Terms for using data resources. CD-ROM available.
Credits and Acknowledgments for WW2010.
Department of Atmospheric Sciences (DAS) at
the University of Illinois at Urbana-Champaign.

3hr press & wind