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JMA Himawari-9 True Color RGB images created using Geo2Grid (above) showed the motion of a plume of discolored water — located between Saipan and Anatahan in the Northern Mariana Islands — which was the result of an eruption of the Ruby submarine volcano late in the day on 14 September 2023 (Volcanic Activity Notice).... Read More
JMA Himawari-9 True Color RGB images, from 2150 UTC to 0450 UTC on 14/15 and 15/16 September [click to play animated GIF | MP4]
JMA Himawari-9 True Color RGB images created using Geo2Grid(above) showed the motion of a plume of discolored water — located between Saipan and Anatahan in the Northern Mariana Islands — which was the result of an eruption of the Ruby submarine volcano late in the day on 14 September 2023 (Volcanic Activity Notice). The plume was semi-circular in shape on Day 1 of the 2-day animation, but had become more oblong on Day 2. No atmospheric volcanic clouds were created by this eruption.
The eruption of Mt. Shisaldin late in the day on 15 September (Blog Post) was accompanied by lightning. Shishaldin’s latitude is 54.75oN, very near the northern edge of the GOES-18 Geostationary Lightning Mapper’s (GLM’s) field of view, as shown in this Quick Guide; although most of Alaska is not sampled by the GLM... Read More
The eruption of Mt. Shisaldin late in the day on 15 September (Blog Post) was accompanied by lightning. Shishaldin’s latitude is 54.75oN, very near the northern edge of the GOES-18 Geostationary Lightning Mapper’s (GLM’s) field of view, as shown in this Quick Guide; although most of Alaska is not sampled by the GLM instrument, parts of the Aleutians are, including the land surrounding Shishaldin. The toggle below shows the SO2 RGB at 0220 UTC and 1-minute Flash Extent Density at 0219 UTC on 16 September 2023. This case is a good reminder that GLM can give lightning information, even in Alaska!
GOES-18 SO2 RGB (0220 UTC) with and without GOES-18 observations of GLM 1-minute Flash Extent Density at 0219 UTC 16 September 2023 (Click to enlarge)
Similarly, GLM observed lightning at 0151 and 0152 UTC 0n 16 September 2023, as shown below.
GOES-18 SO2 RGB (0150 UTC) with and without GOES-18 observations of GLM 1-minute Flash Extent Density at 0151/0152 UTC 16 September 2023 (Click to enlarge)
GLM imagery for this blog post was created using CSPP’s Gridded GLM software that operates on Level 2 LFCA files; resultant GLMF files were then placed into AWIPS.
GOES-18 (GOES-West) SO2 RGB images (above) showed the eastward drift of a volcanic cloud produced by an explosive eruption of Mount Shishaldin that began around 0150 UTC on 16 September 2023. Trace amounts of ash fall were observed at False Pass from 0200-0430 UTC.GOES-18 True Color RGB images from the CSPP GeoSphere site (below) helped to highlight the... Read More
GOES-18 SO2 RGB images [click to play animated GIF | MP4]
GOES-18 (GOES-West)SO2 RGB images (above) showed the eastward drift of a volcanic cloud produced by an explosive eruption of Mount Shishaldin that began around 0150 UTC on 16 September 2023. Trace amounts of ash fall were observed at False Pass from 0200-0430 UTC.
GOES-18 True Color RGB images from the CSPP GeoSphere site (below) helped to highlight the ash-laden volcanic cloud (light shades of tan) moving east from the summit of Shishaldin.
GOES-18 True Color RGB images [click to play MP4 animation]
GOES-18 “Red” Visible (0.64 µm) images (below) include plots of GLM Group points — which revealed 2 brief periods of satellite-detected volcanic lightning activity near the summit of Shishaldin shortly after the eruption onset. Station PAKF is False Pass, where some light ash fall was observed.
GOES-18 “Red” Visible (0.64 µm) images, with GLM Group points plotted in cyan [click to play animated GIF | MP4]
Lots of lightning from the ongoing eruption of Shishaldin Volcano in western Alaska. pic.twitter.com/hYVBEQ0vhA
Hurricane Lee, moving northward off the east coast of the United States, is generating a large cirrus shield (see the ABI Band 4 image below) at high levels over New England, as also shown in the Air mass RGB shown above. The corrugated features in the cirrus are well-known predictors... Read More
Air mass RGB over Hurricane Lee, 1336 – 2051 UTC, along with PIREPs of turbulence and CIMSS estimates of Turbulence Probability, 1336 – 2051 UTC 15 September 2023 (Click to enlarge)
Hurricane Lee, moving northward off the east coast of the United States, is generating a large cirrus shield (see the ABI Band 4 image below) at high levels over New England, as also shown in the Air mass RGB shown above. The corrugated features in the cirrus are well-known predictors of aircraft turbulence, and pilot reports of observations are common within the field of cirrus (as shown in these blog posts). Additionally, the CIMSS Turbulence product, a prediction developed using Machine Learning and ABI Channels 8 (Upper-level water vapor, 6.19 µm) and 13 (Clean window infrared, 10.3 µm), along with GFS thermondynamic fields, shows a high probability of turbulence in the region where turbulence is observed. CIMSS turbulence probability fields are also available online here. A training recording (mp4) on the product is here.
GOES-East ABI Cirrus Channel (Band 4, 1.37 µm), 2006 UTC, 15 September 2023 (Click to enlarge)
For the latest on Hurricane Lee, refer to the National Hurricane Center (USA, Canada). Information is also available at the NWS Forecast Offices in Boston, Portland (Gray Maine), and Caribou.
Many thanks to Professor Rick DiMaio at Lewis University for focusing our attention on this event!
