Global Visible True-Color Imagery

February 14th, 2020 |

True-Color visible imagery from 9 February 2020 (Click to enlarge)

Prediction: This is the most beautiful satellite image you will see today. The above imagery, from the talented Rick Kohrs at the Space Science and Engineering Center, knits (seemingly seamlessly) together vertical local-noon swaths of multispectral visible/near-infrared Geostationary imagery, all using McIDAS-X. At some point in the near future, daily imagery will be created, and then an annual movie. (Click here for an image from 21 March 2019, or from 21 September 2019).

In each image, the sub-point of a satellite used to create the image is evident in the Sun Glint (at 140.2ºE for Himawari-8, or 137.2ºW and 75.2ºW for GOES-17 and GOES-16, respectively). Values at the eastern and western edges do not match up because they are offset by 1 day. A break-point has to be inserted, so why not at the edge?

Mesoscale Convective System in Argentina

February 14th, 2020 |

GOES-16

GOES-16 “Clean” Infrared Window (10.35 µm) images [click to play animation | MP4]

GOES-16 (GOES-East) “Clean” Infrared Window (10.35 µm) images (above) showed a large Mesoscale Convective System (MCS) west of Resistencia (station identifier SARE) in far northern Argentina on 14 February 2020 — this MCS developed southeast of an area of low pressure that was situated well north of a slow-moving cold front (surface analyses). The coldest GOES-16 cloud-top infrared brightness temperature was -94.1ºC on the 0750 UTC image.

VIIRS Infrared Window (11.45 µm) images from NOAA-20 (at 0452 UTC) and Suomi NPP (at 0541 UTC) as viewed using RealEarth (below) revealed intricate patterns of cloud-top waves and radial banding.

VIIRS Infrared Window (11.45 µm) images from NOAA-20 (at 0452 UTC) and Suomi NPP (at 0541 UTC) [click to enlarge]

VIIRS Infrared Window (11.45 µm) images from NOAA-20 (at 0452 UTC) and Suomi NPP (at 0541 UTC) [click to enlarge]

Plots of available NOAA-20 NUCAPS sounding points are shown below. NUCAPS profiles immediately north and south of the MCS revealed a very moist and unstable atmosphere, with Total Precipitable Water values around 2.4 inches and Most Unstable air parcel Convective Available Potential Energy (CAPE) values of 4500-5200 J/kg. The red NUCAPS profile dots indicate points where both the infrared and microwave retrievals failed — these are located within the core of the MCS.

Plots of available NUCAPS sounding points at 0341 UTC [click to enlarge]

Plots of available NOAA-20 NUCAPS sounding points [click to enlarge]

NUCAPS profile north of the MCS [click to enlarge]

NOAA-20 NUCAPS profile just north of the MCS [click to enlarge]

NUCAPS profile south of the MCS [click to enlarge]

NOAA-20 NUCAPS profile just south of the MCS [click to enlarge]


Plots of rawinsonde data from Córdoba, Argentina (below) — located not far southwest of the MCS — indicated a tropopause temperature of -74.7ºC at an altitude of 16.4 km on 14 February at 12 UTC.

Plots of rawinsonde data from Córdoba, Argentina [click to enlarge]

Plots of rawinsonde data from Córdoba, Argentina [click to enlarge]