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The Meteorology Leading up to and on Measurement Day Reno 11/05 00Z Sounding • Cold and moist near surface • Under the trough still with clouds present Reno 11/05 12Z Sounding • Morning shows a small inversion but not strong • Winds from the north keep up cool and in the trough Reno 11/06 00Z Sounding • Moisture advection on the back side of the trough indicates a small shortwave disturbance • The moisture creates cloud overnight from the afternoon to morning Reno 11/06 12Z Sounding • Clouds present in the morning on measurement day but not in a thick layer • The inversion was not strong due to the cloud layer • Likely to burn off throughout the day Reno 11/07 00Z Sounding • Drying out in the lower levels • There is a slight increase near 425 mb where the cirrus cloud were likely to have formed during the day from contrails • A stable layer just below 700 mb caps the boundary layer just a little below the high peak levels Reno 11/07 12Z Sounding • A much deeper inversion the following morning • No clouds present which allowed for better radiative cooling UNR Farm • Cold air is present in the days prior • The next morning the temperature dipped to the dewpoint and most likely there was frost • Wind are much lighter and variable on the back side of the trough • We can also see the solar radiation track become more constant and less variable DRI Station • Cold air is present again • The max and min are not as sharp as after the trough moves out • Winds are much weaker after the trough and there is no longer any precipitation as when the trough passed • The rising pressure notes the building high pressure anticyclone Conclusion • The back side of the trough leads to clearer skies • These clear skies lead to much larger temperature spread in the Nevada desert from day to night • On our measurement day the lingering water vapor produce some cloud with interesting radiative effects • Over night clouds can keep night time temperatures up and clouds during the day can keep day time temperatures down (Depending on the type of cloud)