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Pennsylvania Historical and Museum Commission
Bureau of Archives and History
Pennsylvania State Archives


MG-288

U.S. WEATHER BUREAU RECORDS FOR PENNSYLVANIA

Series Descriptions


Winds-Aloft Computation Sheets (WBAN-20),
1967-1974.
(14 boxes)

{series #288.1}
[Holdings]

Arranged alphabetically by name of reporting station, then chronologically by date of recording.

Documents recording wind direction and wind speed at specified heights above the Earth's surface, obtained from pibals and rawins (two different types of balloons used to gather weather information), are contained in Series 1. Readings from recording stations at Harrisburg, Philadelphia, Pittsburgh and Williamsport are present. Information recorded on the sheets includes: pibal or rawin height above the Earth's surface, observed elevation angle, distance in meters from observation point, azimuth angle, wind direction and wind speed.

Summary of Winds Aloft Charts (WBAN-22),
1930-1964.
(5 boxes)

{series #288m.2}
[Holdings]

Arranged alphabetically by name of reporting station, then chronologically by date of recording.

Charts recording wind direction and wind speed at specified heights above the Earth's surface, obtained from pibals and rawins, are present in this series. Noted on the sheets are the stations which conducted the various observations, as well as the year, month, day, and hour the observations were taken. Weather conditions on days that measurements were not taken are also described on some of the earlier forms. Cloud readings appear for various days between 1940 and 1942. The design of the charts, as well as the way data was recorded, change over time. For example, a sixteen-point numbering system for wind direction instead of the traditional "NW," N," "SE" designations was adopted in the 1940s. Beginning in August 1936, four observations a day were taken, one every six hours. The times at which they were taken changed over the years, including a change on June 1, 1957 from 03, 09, 15 and 21 Greenwich mean time to 00, 06, 12 and 18 GMT.

Summary of Constant Pressure Charts (WBAN-33),
1946-1973.
(5 boxes)

{series #288m.3} [Holdings]

Arranged alphabetically by name of reporting station, then chronologically by date of recording.

Charts containing data relative to constant air pressure, reported at the Pittsburgh recording station. Information recorded includes: specific reporting station, station identification data, elevation, scheduled time of release, actual time of release, pressure reading, temperature, relative humidity, wind direction, wind velocity, initials of computer and initials of verifier. Daily readings were taken twice a day from 1946 through March 1954, then four times a day starting in April 1954. The measurements were taken at 03, 09, 15 and 21 GMT, and were changed 00, 06, 12 and 18 GMT beginning in June 1957. In October 1957 the readings were scaled back to twice a day once again, occurring at 00 and 12 GMT.


PA State Archives Hours, Directions, & Fees Research Topics Finding Aids for Collections Land Records