Stereoscopic View of Tropical Storm Gordon in the Gulf of Mexico

September 4th, 2018 |

GOES-16 (left) and GOES-17 (right) Visible (0.64 µm) imagery on 4 September 2018, starting at 1132 UTC (Click to play mp4 animation)


GOES-17 Data shown here are preliminary and non-operational!

Stereoscopic views (using GOES-16 and — preliminary and non-operational — GOES-17 Visible (0.64 µm) imagery) of strengthening Tropical Storm Gordon are shown above. The stereoscopic view shows an initially sheared storm, with the surface circulation apparent becoming somewhat less sheared as convection redevelops over the surface center. (To view in three dimensions: cross your eyes until 3 equal images are apparent, and focus on the image in the center). This animation will be updated periodically as more GOES-17 data become available. (Click here for animated gif)

For more information on this storm, consult the National Hurricane Center website, or the CIMSS Tropical Weather Website.

Why Mesoscale Sectors Matter: Hurricane Norman

August 30th, 2018 |

GOES-16 Mesoscale Sectors over Hurricane Norman (left) and a tropical wave (right), along with a CONUS image

Pacific Hurricane Norman, a potent storm with sustained winds of 150 mph, exists outside of GOES-16’s CONUS (Contiguous United States) domain. In fact, on 30 August 2018, both GOES-16 Meso sectors were placed over the tropics to provide 1-minute imagery of tropical systems, both Norman over the Pacific, and a strong tropical easterly wave over the Atlantic and Caribbean. The toggle above shows the two positions (using visible imagery at 0.64 µm) along with the CONUS domain (using the clean window, band 13 at 10.3 µm).

The Mesoscale Sector allows 1-minute imagery over Norman. Otherwise, full-disk imagery with a time cadence of every 15 minutes would be used. The hour-long animation, below, shows the evolution of the storm and its environment.

GOES-16 ABI Band 2 Visible (0.64 µm) imagery, 2016-2115 UTC (Click to enlarge)

A closer view of the eye, below, (Click to play animated gif), shows a well-developed eye with embedded low clouds. Because Norman is near 120 W, the view angle is oblique and only the western edge of the eyewall can be viewed.

GOES-16 ABI Band 2 Visible (0.64 µm) imagery, 2016-2115 UTC (Click to animate)

Norman appears to be at the northern edge of deep tropical moisture, based on the toggle below of GOES-16 Clear Sky Total Precipitable Water and the GOES-16 infrared Low-Level Water Vapor image (7.34 µm). The projected path of Norman is mostly Westward so the storm will remain within deep tropical moisture for the next several days. It is forecast to remain a strong hurricane.

GOES-16 ABI Clear-Sky Total Precipitable Water toggled with GOES-16 Infrared Low-Level Water Vapor (7.34 µm) in cloudy skies, 2000 UTC on 30 August 2018 (Click to enlarge)

For more information on Norman, please consult the website of the National Hurricane Center or the SSEC/CIMSS Tropical Weather Website.

Stereoscopic Views of Convection every minute in Mesoscale Domains

August 29th, 2018 |

GOES-17 and GOES-16 Mesoscale Domains at 1616 UTC on 29 August 2018 (Click to enlarge)

GOES-17 images shown here are preliminary and non-operational

The presence of GOES-17 data means that 4 mesoscale sectors, each taking 1-minute imagery, are over the United States. In the example above, from 1616 UTC on 29 August 2018, there is no overlap. (Note: Three of the Four are in their default locations; the Mesoscale sector over the northeast United States has been shifted north to monitor convection over New England).

On 28 August 2018, however, two mesoscale sectors overlapped over the central United States, and sampled convection developing over Oklahoma (that subsequently caused wind damage in Roger Mills County in western Oklahoma). The Stereoscopic View of that convection is shown below. To view the convection in three dimensions, cross your eyes until you see 3 images, and focus on the image in the center. An animated gif (215 Megabytes!!) is available here.

GOES-16 (Left) and GOES-17 (right) Visible (0.64) stereoscopic views of convection developing over western Oklahoma, 2000 UTC 28 August – 0118 UTC 29 August 2018 (Click image to play mp4 animation)

GOES-17 Data are flowing in GRB

August 28th, 2018 |

GOES-17 0.86 µm Near-Infrared and 3.9 µm Infrared imagery, 1607 UTC on 28 August 2018 (Click to enlarge)

GOES-17 images shown here are preliminary and non-operational

The GOES Rebroadcast (GRB) is now transmitting GOES-17 data that remain Preliminary and non-operational.  The first data sent were at 1530 UTC on 28 August. The toggle above shows Bands 3 (“Veggie Band”, 0.86 µm) and Band 7 (“Shortwave Infrared”, 3.9 µm) from the Meso-1 sector that was positioned over the West Coast at 1607 UTC on 28 August 2018.  Band 13 (“Clean Window”, 10.3 µm), below, from the Meso-2 sector is over the High Plains.

GOES-17 10.3 µm Infrared imagery, 1613 UTC on 28 August 2018 (Click to enlarge)

Visible (Band 2, 0.64 µm) Imagery from 1531 UTC, below, was produced using CSPP Geo, a software package that reads the GRB signal and produces imagery. (Image courtesy Graeme Martin, CIMSS)

GOES-17 Visible (0.64) Imagery at 1531 UTC on 28 August 2018 (Click to enlarge)

The Geo2Grid Software Package can be used with GRB output to produce True-Color imagery, as shown below. The full-disk image was created in about 8 minutes using a centOS server, and it is corrected for atmospheric and solar zenith angle effects. Green Band information is simulated from other ABI channels.

Geo2Grid True Color Imagery, 1700 UTC on 28 August 2018 (Click to enlarge)

Full Disk examples of imagery from all 16 ABI bands (in addition to a Natural Color RGB image) are shown below (courtesy Mat Gunshor, CIMSS).

GOES-17 Natural Color RGB and individual ABI band images (Click to animate)

GOES-17 Natural Color RGB and individual ABI band images (Click to animate)