Cutoff low off the Southern California coast

April 8th, 2020 |

GOES-17 Mid-level Water Vapor (6.9 µm) images [click to play animation | MP4]

GOES-17 Mid-level Water Vapor (6.9 µm) images [click to play animation | MP4]

GOES-17 (GOES-West) Mid-level Water Vapor (6.9 µm) images from the AOS site (above) showed the broad circulation around an anomalously-deep middle tropospheric cutoff low centered along the California coast on 08 April 2020. The system was producing record daily rainfall amounts, which in tandem with the clouds kept daily high temperatures at record low values at some locations across Southern California.

Overlapping 1-minute Mesoscale Domain Sectors provided GOES-17 “Red” Visible (0.64 µm) images at 30-second intervals (below) — which revealed the southeastward propagation of a compact circulation of clouds west of San Nicholas Island.

GOES-17

GOES-17 “Red” Visible (0.64 µm) images [click to play animation | MP4]

Experimental: The VIIRS Today website

April 8th, 2020 |

NOAA-20 VIIRS Day Night Band over the western United States, ~0900 UTC on 8 April 2020 (Click to enlarge)

CIMSS has long hosted the popular site ‘MODIS Today‘ that allows easy access to full-resolution imagery from the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on board Terra (launched in 1999 and still producing imagery) and Aqua (launched in 2002 and still producing imagery). That site remains active and allows access to imagery back to 2007.

Ongoing work at CIMSS means a similar site for VIIRS imagery will soon be available, allowing access to full-resolution VIIRS imagery. For example, the Day-Night Band image above, during the Full Moon on 8 April 2020, is presented in one region of the USA — the Pacific Northwest just after 0900 UTC, on a clear night. The image below shows the midwestern United States at around 0700 UTC. (Reminder:  NOAA-20 Orbits can be viewed here).

Stay tuned!

NOAA-20 VIIRS Day Night Band over the midwestern United States, ~0700 UTC on 8 April 2020 (Click to enlarge)