Case: 27 October 2018

Summary

A multi-day open cell to widespread stratocumulus event under northeasterly flow

Description

This was a multi-day (October 27th - 28th) event that featured open cell cumulus conditions on October 27th that gradually transitioned to closed cell cloud conditions by early morning hours on October 28th. There were light boundary layer winds throughout this event that were out of the northeast. The open cell periods during the early and overnight hours of October 27th exhibited signatures of heavier precipitation, whereas the eventual closed cell conditions on October 28th also exhibited several intervals of suggested subcloud precipitation. Inversion height at approximately 1.9 km AGL, and this lowered to approximately 1.3 km by October 28th.

Available assets

Standard ARM profiling assets, SEVIRI. SACR. RLPROF-FEX

Critical period: 18:00-24:00

A transition from open to predominantly closed cellular organization

True color MODIS AQUA — Figure 16 True color afternoon MODIS AQUA image with overlaid LES domains. The image domain corresponds to the size of the model forcing domain.