8 March 2002 cold front passage

Brigham Young University

Dept. of Physics & Astronomy

Weather data graph

Most of the previous day (7 March) the sky had been overcast with stratus clouds. At about 2:15 PM a noticeable line of clouds extending below the existing cloud deck was seen moving eastward across the face of Mt. Timpanogos. At about 2:33 PM the temperature dropped several degrees, the humidity rose rapidly, the wind abruptly shifted from southerly to westnorthwest and a light rain began to fall. The pressure had been slowly dropping most of the day. As the squall passed there was a spike in the pressure that lasted about 30 minutes followed by a short rise in the pressure before it began falling again due to the cold front that was still approaching. There was a short snow squall at about 3:08 PM. Around 3:10 PM (near the end of the spike in the atmospheric pressure) the wind shifted to easterly with continued light rain. By 3:25 PM the winds were relatively calm and the skies were clearing in the west.

At about 6:20 PM there was another disturbance with a rapid drop in temperature and rise in humidity. The wind went through a shift from southerly to westerly then back to southerly and then easterly followed by a slow change back to southerly by 9 PM. At 10 PM there was another squall line with significant precipitation, a drop in temperature, rise in humidity, and somewhat erratic winds.

At about 2:00 am there was an abrupt drop in temperature (10 °F), slight rise in humidity, and significant rise in pressure followed by a slow, continuous rise in pressure. the wind also switched abruptly form southerly to northwesterly indicating the passage of the cold front.

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