COAMPS processes leading to a false positive fog forecast during C-FOG IOP12
Abstract
During the C-FOG field campaign, we used COAMPS forecasts for planning Intense Observational Periods (IOP). During the last IOP 12 (October 3-4 2018), all consecutive forecasts from the days leading to IOP 12 were consistently predicting fog over the SW portion of the Avalon Peninsula. The fog was never observed at the instrument stations, except for a very short time at one station. The preliminary analysis after the experiment revealed that the fog creation mechanism in the model was cloud base lowering. While the stratus lowering was observed and measured, the cloud base never touched the ground in reality, but it did in COAMPS. We use extensive in-situ measurements collected during C-FOG to analyze and validate physical parameterizations in COAMPS representing processes involved in fog creation, duration and dissipation.
- Publication:
-
AGU Fall Meeting Abstracts
- Pub Date:
- December 2020
- Bibcode:
- 2020AGUFMA089.0001G
- Keywords:
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- 3307 Boundary layer processes;
- ATMOSPHERIC PROCESSES;
- 3311 Clouds and aerosols;
- ATMOSPHERIC PROCESSES;
- 3329 Mesoscale meteorology;
- ATMOSPHERIC PROCESSES;
- 3355 Regional modeling;
- ATMOSPHERIC PROCESSES