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 Dew Point Temperature and Wind Change
surface analysis pairs


Example Surface 3 Hour Dew point Temperature and Wind Change


This is the Surface 3 Hour Dew Point Temperature and Wind Change image, and on this image are areas of 3 hour positive and negative dew point temperature change, plus 3 hour wind changes. This image is useful in the spring when thunderstorms are a concern.

Positive dew point temperature change areas are contoured in solid yellow lines and indicate that the dew point temperature is rising in that region. Negative temperature change areas are contoured in dashed yellow lines and indicate that the dew point temperature is falling in that region. Both dew point temperature change areas are contoured in intervals of 5 degrees Fahrenheit. Therefore, a positive dew point temperature change contour of 5 would indicate that the dew point 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 can be especially useful in the spring time, when thunderstorms are a concern. Moisture plays an important role in thunderstorm development, and where there are regions of positive 3 hour dew point temperature changes there are better chances for thunderstorm development than if there were regions of negative 3 hour dew point temperature changes. Since dew point temperature can be thought of as a measurement of moisture, the higher the dew point temperatures the greater amount of moisture present. Therefore, an area of positive 3 hour dew point temperature change can indicate that the moisture content of the air has increased in that region, which can aide in the development of thunderstorms.

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 strong dew point temperature decrease and an increase in the westerly winds located near Wisconsin and Illinois. Both of these features are signs that a cold front has passed through that area.



dew point advect
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 temp & wind