Hurricane Teddy rapidly intensifies to a Category 4 storm

September 17th, 2020 |

GOES-16 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (with and without an overlay of GLM Flash Extent Density) [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (with and without an overlay of GLM Flash Extent Density) [click to play animation | MP4]

1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images — with and without an overlay of GLM Flash Extent Density (above) showed Hurricane Teddy as it rapidly intensified (ADT | SATCON ) to a Category 4 storm on 17 September 2020. The coldest cloud-top infrared brightness temperatures were in the -80 to -85ºC range.

Metep-A ASCAT surface scatterometer wind speeds were as high as 74 knots in the northwestern portion  of the eyewall (below).

GOES-16 “Red” Visible (0.64 µm) image, with plots of Metop-A ASCAT winds [click to enlarge]

GOES-16 “Red” Visible (0.64 µm) image, with plots of Metop-A ASCAT winds [click to enlarge]

Microwave (85 GHz) DMSP-17 (at 1023 UTC), GMI (at 1720 UTC) and DMSP-18 (at 2034 UTC) images from the CIMSS Tropical Cyclones site are shown below.

DMSP-17 SSMI Microwave (85 GHz) image at 1023 UTC [click to enlarge]

DMSP-17 SSMI Microwave (85 GHz) image at 1023 UTC [click to enlarge]

GMI Microwave (85 GHz) image at 1720 UTC [click to enlarge]

GMI Microwave (85 GHz) image at 1720 UTC [click to enlarge]

DMSP-18 SSMI Microwave (85 GHz) image at 2034 UTC [click to enlarge]

DMSP-18 SSMI Microwave (85 GHz) image at 2034 UTC [click to enlarge]

Medicane approaching Greece

September 17th, 2020 |

Daily VIIRS True-Color images over the central Mediterranean Sea, 14 – 19 September 2020 (Click to enlarge)

A Medicane (a portmanteau of Mediterranean and Hurricane) has developed in the central Mediterranean Sea, and moved northeastward through the Ionian Sea towards Greece and Albania. Daily snapshots of VIIRS true-color imagery, above, from NASA Worldview, show a slow increase in organization. (Previous CIMSS Blog Posts on Medicanes are here, here and here.) This Medicane was given the name ‘Ianos’.

There is an isolated region of small values of wind shear over this system (1800 UTC image from 17 September, from this website), as expected for a tropical storm.  An image of hourly CMORPH precipitation values, below, show heavy precipitation associated with the storm as well.

CMORPH Hourly Precipitation ending 1700 UTC on 17 September 2020 (Click to enlarge)

The ASCAT instrument on Metop-B observed a very tight cyclonic circulation on 16 September, as shown below (imagery from this site).

Metop-B ASCAT winds, 16 September 2020 (Click to enlarge)

MIMIC Total Precipitable Water (TPW) (below, from this site) shows a compact swirl around the storm, with large values of TPW.

MIMIC Total Precipitable Water for the 24 hours ending 2000 UTC on 17 September 2020 (click to enlarge)


NASA’s IMERG product showed the heavy rain that was associated with this storm as it moved towards Greece.