Rapid Refresh (RAP) and High-Resolution Rapid Refresh (HRRR) Forum
moisture over northwestern Mexico
Posted By: Todd Hutchinson
Date: 18-March-04 1730Z
I noticed that in the NCEP operational RUC analyses from yesterday, 2 m mixing ratios were extremely high, up to 24 g/kg (results in a dew point of about 78 F at 960 mb). Mixing ratios began increasing at 18Z (17 Mar), peaked at 00Z, and were back down to reasonable values (about 7 g/kg) by 6Z (18 Mar). This resulted in the RUC generating convection in the region--no convection was observed. You can look at a few plots of mixing ratios at:
This occurred over a relatively large area (several hundred square kilometers). Unfortunately, I could not find one surface observation in the region. The satellite picture from 00Z was completely clear--so, not convection was occurring.
I don't believe that the dew points could possibly be this high--could something have gone wrong in the RUC assimilation?
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