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Hurricane Hanna makes landfall in Texas

By Scott Bachmeier •

GOES-16 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images [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 (above) showed Category 1 Hurricane Hanna making landfall along the South Coast of Texas at 2200 UTC on 25 July 2020. The coldest cloud-top infrared brightness temperature was -88.6ºC at 1633 UTC. Winds gusted to 76 mph at Buoy 42020, and at 18 UTC a ship about 30 miles off the Texas coast reported blowing spray.

GOES-16 GLM Flash Extent Density (below) showed little to no lightning activity within the immediate eyewall region of Hurricane Hanna during the 9 hours leading up to landfall; however, lighting did increase somewhat after the 22 UTC landfall.

GOES-16 “Clean” Infrared Window (10.35 µm) images, with an overlay of GLM Flash Extent Density [click to play animation | MP4]

GOES-16 “Clean” Infrared Window (10.35 µm) images, with an overlay of GLM Flash Extent Density [click to play animation | MP4]

A comparison of time-matched Infrared images from Suomi NPP and GOES-16 ABI (below) showed the effect of parallax displacement, even at the relatively low latitudes of South Texas. The coldest cloud-top infrared brightness temperature on the VIIRS image was -86ºC, compared to -81ºC on the ABI image (the same color enhancement is applied to both images).

Infrared images from Suomi NPP and GOES-16 ABI [click to enlarge]

Infrared images from Suomi NPP and GOES-16 ABI [click to enlarge]

Categories: GLM, GOES-16, Lightning, Suomi NPP, Tropical cyclones, VIIRS