Geostationary satellite views of the most rain over 72-hours in 2007

February 27th, 2021 |

The record for the most rain over a 72-hour period was in late February 2007, with 3.930m (154.72″)! This was on Reunion Island, associated with Tropical Cyclone Gamede in South Indian Ocean. The island is east of Madagascar. This island also holds the record for the most rain (4,869 mm (191.7 in)) over a 96-hour period, associated with the same event. More on this case can be found in this 2009 BAMS article.

Meteosat-8

While the view of the cyclone from EUMETSAT‘s MET-8 was on the edge of the viewing area, the infrared window loop was still impressive.

A 3-day color-enhanced infrared window loop from EUMETSAT’s Meteosat-8 geostationary imager.

A longer loops of 3 and 4 days were also generated. Which shows Tropical Cyclone Favio as well. For these images, the coldest brightness temperatures have the green/yellow/red/pink colors. A one-day loop (February 25, 2007) in both mp4 and animated gif formats.

Meteosat-7

EUMETSAT’s Meteosat-7, due to its location over the Indian Ocean, had a more direct view of these cyclones.

A 3-day color-enhanced infrared window loop from EUMETSAT’s Meteosat-7 geostationary imager.

Note that the view angle is improved over Meteosat-8, but the image frequency is reduced. A longer Meteosat-7 loop was also generated. Again, Tropical Cyclone Favio can be seen.

A loop of Meteosat-7 visible band from February 25, 2007.

Visible loops (mp4 format) from February 23 and 24 and 26, 2007. The same loops as animated gifs: February 23, 24, 25 and 26, 2007.

H/T

Thanks to @Weather_History for the post on this event.

The above satellite data are from EUMETSAT, accessed via the University of Wisconsin-Madison Space Science and Engineering Center (SSEC) Data Services. The images were generated with McIDAS-X. More on EUMETSAT’s Meteosat Third Generation will appear in the Bulletin of the AMS.

Snow squalls in Montana

February 27th, 2021 |

GOES-16 “Red” Visible (0.64 µm) and Day Cloud Phase Distinction RGB images [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm) and Day Cloud Phase Distinction RGB images [click to play animation | MP4]

GOES-16 (GOES-East) “Red” Visible (0.64 µm) and Day Cloud Phase Distinction RGB images (above) showed a cluster of convective features propagating south-southeastward over and to the east of Billings, Montana on 27 February 2021. The shades of green in the RGB images indicated that some of these cloud tops were glaciating, suggesting enough vertical development to produce significant precipitation — and the resulting snow squalls could have contributed to a multi-vehicle accident which closed down Interstate 90 (between Billings and the I-90/I-94 junction) shortly after 1900 UTC. A brief accumulation of 1.3 inches was reported just north of Billings around the time of the accident, and the 1900 UTC surface visibility dropped to 3/4 mile at Billings airport (but was likely lower where the more intense snow squalls were occurring farther east).

The corresponding GOES-17 (GOES-West) Visible/RGB animations are available here: GIF | MP4. A toggle between the 1901 UTC Day Cloud Phase Distinction RGB images from GOES-16 and GOES-17 is shown below. The satellite viewing angles are nearly equivalent from both satellites (around 60 degrees) — but the apparent location of the snow squall features is shifted, due to parallax.

1901 UTC Day Cloud Phase Distinction RGB images from GOES-16 and GOES-17 [click to enlarge]

1901 UTC Day Cloud Phase Distinction RGB images from GOES-16 and GOES-17 [click to enlarge]