EAS 486 Mesoscale Meteorology - Assignment 2: Station Averaging

In order to be able to analyze mesoscale features for the September 14 and 15, 2004, we need to find out if there was any systematic station errors and correct them. To do this, we need to examine the stations in the areas on a day when there isn't much of a pressure gradient. We will use September 7 as the correction day.

For all of the stations in the Minnesota-Iowa area (area shown on this map; station names shown on maps for Minnesota, Iowa, Nebraska, South Dakota, Wisconsin, and northern Illinois), divide the number of stations into 6 equal groups. Each student will take one group.

Then, gather all surface observations in your group from Plymouth State College's 24-hour meteorgram during 00Z-23Z 7 September from the table format (use decoded obs text listing option). From these data, collect the temperature (°F), dew point (°F), and altimeter setting (convert to mb) (see format).

Then, compute the average values of temperature, dew point, and altimeter setting as noted above according to the following categories:

1. Accept station with no question if there are 24 hours worth of data.
2. Accept station with some question if there are 21-23 hours worth of data. (keep averages separate from data in category 1).
3. Reject station with less than 21 hours worth of data.

Compute these average values and email to Bob before noon Monday, January 26.

Send comments to Bob Weisman.

Last Updated: January 20, 2009