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Occluded low in the Gulf of Alaska

By Scott Bachmeier •

GOES-17 (GOES-West) Mid-level Water Vapor (6.9 µm) images revealed ribbons of dry air wrapping around and within the circulation of an occluded Gale Force low (surface analyses) in the Gulf of Alaska on 28 May 2020. In the corresponding Air Mass RGB images, these ribbons of dry air exhibited darker shades of red —... Read More

GOES-17 Mid-level Water Vapor (6.9 µm), Air Mass RGB images (with and without an overlay of PV1.5 Pressure) [click to play animation | MP4]

GOES-17 Mid-level Water Vapor (6.9 µm) and Air Mass RGB images (with and without an overlay of PV1.5 Pressure) [click to play animation | MP4]

GOES-17 (GOES-West) Mid-level Water Vapor (6.9 µm) images revealed ribbons of dry air wrapping around and within the circulation of an occluded Gale Force low (surface analyses) in the Gulf of Alaska on 28 May 2020. In the corresponding Air Mass RGB images, these ribbons of dry air exhibited darker shades of red — caused by higher ozone concentrations aloft due to the dynamic tropopause (represented by the pressure of the PV1.5 surface) descending to the 400-500 hPa pressure level.

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Tropical Cyclone Bertha

By Scott Bachmeier •

1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (above) showed Tropical Storm Bertha as it moved inland across South Carolina on 27 May 2020. The clusters of deep convection rapidly dissipated after landfall, revealing the low-level circulation. Bertha did produce heavy rainfall and high winds.A GMI Microwave (85 GHz) image at 1416 UTC from the CIMSS Tropical Cyclones... Read More

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 Tropical Storm Bertha as it moved inland across South Carolina on 27 May 2020. The clusters of deep convection rapidly dissipated after landfall, revealing the low-level circulation. Bertha did produce heavy rainfall and high winds.

A GMI Microwave (85 GHz) image at 1416 UTC from the CIMSS Tropical Cyclones site (below) displayed an arc of moderate to heavy precipitation less than an hour following landfall.

GMI Microwave (85 GHz) image at 1416 UTC [click to enlarge]

GMI Microwave (85 GHz) image at 1416 UTC [click to enlarge]

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Heavy rainfall and flash flooding in South Florida

By Scott Bachmeier •

1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.35 µm) images (above) showed training and back-building thunderstorms that produced very heavy rainfall and flash flooding across parts of South Florida — particularly in the Miami (KMIA) area — on 26 May 2020. Pulsing overshooting tops were evident, with cloud-top infrared brightness temperatures... Read More

GOES-16 “Red” Visible (0.64 µm) and

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 training and back-building thunderstorms that produced very heavy rainfall and flash flooding across parts of South Florida — particularly in the Miami (KMIA) area — on 26 May 2020. Pulsing overshooting tops were evident, with cloud-top infrared brightness temperatures as cold as -77ºC.

The GOES-16 Total Precipitable Water product (below) revealed clear-sky TPW values as high as 2.2 inches (lighter shades of magenta).

GOES-16 Total Precipitable Water product [click to play animation | MP4]

GOES-16 Total Precipitable Water product [click to play animation | MP4]

Hourly images of the MIMIC Total Precipitable Water product (below) showed the rich tropical moisture associated with a tropical disturbance that had resided over the region for several days.

MIMIC Total Precipitable Water product [click to enlarge]

MIMIC Total Precipitable Water product [click to enlarge]

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1985 (May 31st) Tornado Outbreak as seen from GOES-6

By Tim Schmit •

The visible and infrared bands from GOES-6 observed the historic (31 May 1985) tornado outbreak over Pennsylvania and other parts of the Northeast. For the IR band, the coldest cloud-top temperatures are highlighted with colors. Here’s is a visible animation a bit more zoomed in.A GOES-6 visible loop, starting at... Read More

The visible and infrared bands from GOES-6 observed the historic (31 May 1985) tornado outbreak over Pennsylvania and other parts of the Northeast. For the IR band, the coldest cloud-top temperatures are highlighted with colors. Here’s is a visible animation a bit more zoomed in.

A GOES-6 visible loop, starting at 11:00 UTC on May 31, 1985 (and ends at 01:00 UTC on June 1, 1985):

A similar  GOES-6 visible loop, but a bit more zoomed in. Loop starting at 11:00 UTC on May 31, 1985 (and ends at 01:00 UTC on June 1, 1985):

A GOES-6 infrared loop, starting at 11:00 UTC on May 31, 1985 (and ends at 00:30 UTC on June 1, 1985):

 

Fade between a GOES-6 Visible and Infrared band:

https://cimss.ssec.wisc.edu/satellite-blog/images/2020/05/goes6_PA_1985_fader.html

“Swipe” between a GOES-6 Visible and Infrared band:

https://cimss.ssec.wisc.edu/satellite-blog/images/2020/05/goes6_PA_1985_swiper.html

 

NOAA GOES-6 data are via the University of Wisconsin-Madison SSEC Satellite Data Services.

More on this case, from Wikipedia and NOAA’s NWS.

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