Cyclone Tauktae in the Arabian Sea

May 16th, 2021 |

US Space Force EWS-G1 Infrared (10.7 µm) images [click to play animation | MP4]

US Space Force EWS-G1 Infrared (10.7 µm) images [click to play animation | MP4]

US Space Force EWS-G1 Infrared (10.7 µm) images (above) showed Cyclone Tauktae in the Arabian Sea (just off the west coast of India) as it intensified from a Category 1 to a Category 3 storm on 16 May 2021.

A DMSP-18 SSMIS Microwave (85 GHz) image from the CIMSS Tropical Cyclones site (below) revealed a fully enclosed eye at 1142 UTC, shortly before Tauktae reached Category 3 intensity at 12 UTC.

DMSP-18 SSMIS Microwave (85 GHz) image at 1142 UTC [click to enlarge]

DMSP-18 SSMIS Microwave (85 GHz) image at 1142 UTC [click to enlarge]

===== 17 May Update =====

US Space Force EWS-G1 Infrared (10.7 µm) images [click to play animation | MP4]

US Space Force EWS-G1 Infrared (10.7 µm) images [click to play animation | MP4]

EWS-G1 Infrared images (above) showed Cyclone Tauktae making landfall along the coast of India around 1745 UTC on 17 May, with a Category 3 intensity (ADT | SATCON).

Palisades Fire in southern California

May 15th, 2021 |

GOES-17 Shortwave Infrared (3.9 µm) images [click to play animation | MP4]

GOES-17 Shortwave Infrared (3.9 µm) images [click to play animation | MP4]

1-minute Mesoscale Domain Sector GOES-17 (GOES-West) Shortwave Infrared (3.9 µm) images (above) displayed the explosive growth of the  Palisades Fire thermal signature late in the day on 15 May 2021. The maximum 3.9 µm brightness temperature sensed was 138.7ºC — which is the saturation temperature for those ABI detectors. The fire prompted evacuation orders in the Topanga, California area.

A time-matched comparison of Shortwave Infrared images from Suomi NPP VIIRS (3.74 µm) and GOES-17 ABI (3.9 µm) at 0918 UTC or 2:18 am PDT is shown below (overpass times of the Suomi NPP satellite). Although a decrease in the fire’s intensity occurred during the subsequent overnight hours, the Shortwave Infrared brightness temperatures sensed by Suomi NPP and GOES-17 at that time were 59.9ºC and 28.1ºC, respectively.

Shortwave Infrared images from Suomi NPP VIIRS (3.74 µm) and GOES-17 ABI (3.9 µm) at 0918 UTC [click to enlarge]

Shortwave Infrared images from Suomi NPP VIIRS (3.74 µm) and GOES-17 ABI (3.9 µm) at 0918 UTC [click to enlarge]

1-minute GOES-17 True Color RGB images created using Geo2Grid (below) revealed a series of “pyrocumulus jump” events (beginning around 01 UTC), when smoke/cloud material was ejected to higher altitudes than the primary smoke plume.

GOES-17 True Color RGB images [click to play animation | MP4]

GOES-17 True Color RGB images [click to play animation | MP4]

Tropical Invest 90E becomes Tropical Storm Andres

May 8th, 2021 |

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

GOES-17 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images [click to play animation | MP4]

1-minute Mesoscale Domain Sector GOES-17 (GOES-West) “Red” Visible (0.64 µm) images (above) showed the convective banding associated with Tropical Invest 90E in the East Pacific Ocean on 08 May 2021. Invest 90E was centered along a northward bulge in the ITCZ/Monsoon Trough (below).

GOES-17 “Clean” Infrared Window (10.35 µm) image (Mesoscale Sector), with an overlay of the 12 UTC surface analysis [click to enlarge]

Invest 90E was located over water characterized by modest Ocean Heat Content and very warm Sea Surface Temperature values (below), favorable factors for further intensification.

Ocean Heat Content and Sea Surface Temperature [click to enlarge]

Ocean Heat Content and Sea Surface Temperature [click to enlarge]

===== 09 May Update =====

GOES-17 “Red” Visible (0.64 µm) and "Clean" Infrared Window (10.35 µm) images [click to play animation | MP4]

GOES-17 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images [click to play animation | MP4]

1-minute GOES-17 Infrared and Visible images on 09 May (above) showed the period where Invest 90E intensified to a Tropical Depression (at 0900 UTC) and then to Tropical Storm Andres at 1500 UTC — the earliest calendar year tropical storm on record in the East Pacific basin. The convective overshooting tops occasionally exhibited infrared brightness temperatures of -90ºC or colder (yellow pixels embedded within dark purple regions).

A GOES-17 Infrared / Water Vapor Difference product (reference) from the CIMSS Tropical Cyclones site (below) highlighted areas of deep convection where overshooting tops were likely penetrating the tropopause (yellow to red enhancement).

GOES-17 Infrared - Water Vapor Difference product [click to enlarge]

GOES-17 Infrared – Water Vapor Difference product [click to enlarge]

GOES-17 Infrared images, with an overlay of deep-layer wind shear (below) indicated that Andres was approaching an environment of moderate to high shear, which would limit intensification.

GOES-17 Infrared images, with an overlay of deep-layer wind shear [click to enlarge]

GOES-17 Infrared images, with an overlay of deep-layer wind shear [click to enlarge]

===== 10 May Update =====

GOES-17 “Red” Visible (0.64 µm) and "Clean" Infrared Window (10.35 µm) images [click to play animation | MP4]

GOES-17 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images [click to play animation | MP4]

On 10 May, 1-minute GOES-17 Infrared and Visible images (above) showed that after one final convective burst, the low-level center of Tropical Storm Andres became exposed — and the storm was then downgraded to a Tropical Depression at 2100 UTC.

Blowing dust across Mongolia and China

May 6th, 2021 |

Himawari-8 Dust RGB images [click to play animation | MP4]

Himawari-8 Dust RGB images [click to play animation | MP4]

JMA Himawari-8 Dust RGB images (created using Geo2Grid) covering the 48-hour period from 21 UTC on 04 May to 21 UTC on 06 May 2021 (above) revealed multiple plumes of blowing dust (brighter shades magenta/pink) which originated over parts of Mongolia — and were then transported southeastward and eastward across northeastern China.

Surface analyses from the Korean Meteorological Agency (below) showed an impressive pressure gradient between a midlatidude cyclone (moving southeastward from Mongolia into China) and high pressure moving southward behind it. Some of the airborne dust was entrained into the circulation of this low pressure system.

Surface analyses during the period from 21 UTC on 0 May to 21 UTC on 06 May [click to enlarge | MP4]

Surface analyses during the period from 21 UTC on 04 May to 21 UTC on 06 May [click to enlarge | MP4]

VIIRS True Color RGB mages from Suomi NPP and NOAA-20 viewed using RealEarth (below) showed the hazy arc of blowing dust along the trailing cold front (south of the cyclone in northeastern China) on 6 May.

VIIRS True Color RGB mages from Suomi NPP and NOAA-20 [click to enlarge]

VIIRS True Color RGB mages from Suomi NPP and NOAA-20 [click to enlarge]