Severe thunderstorms in the Upper Midwest

September 24th, 2019 |

GOES-16 “Clean” Infrared Window (10.35 µm) images, with SPC Storm Reports plotted in cyan [click to play animation | MP4]

GOES-16 “Clean” Infrared Window (10.35 µm) images, with SPC Storm Reports plotted in cyan [click to play animation | MP4]

1-minute Mesoscale Domain Sector GOES-16 (GOES-East) “Clean” Infrared Window (10.35 µm) images (above) showed the development of severe thunderstorms across parts of the Upper Midwest on 24 September 2019 — these storms produced hail as large as 2.5 inches in diameter in Nebraska, a wind gust to 80 mph in Minnesota and an EF3-rated tornado in Wisconsin (SPC Storm Reports | NWS Twin Cities | NWS La Crosse).

The corresponding 1-minute GOES-16 “Red” Visible (0.64 µm) images leading up to sunset are shown below.

GOES-16 “Red” Visible (0.64 µm) images, with SPC Storm Reports plotted in red [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm) images, with SPC Storm Reports plotted in red [click to play animation | MP4]

A “probability of intense convection” model was run for this particular event (below).

“Probability of intense convection” model [click to play MP4 animation]

Satellite views of a Spacecraft Freighter Launch from Tanegashima Island in Japan

September 24th, 2019 |

NOAA-20 Day Night Band visible (0.7 µm) imagery at 1602 UTC on 24 September 2019 (Click to enlarge) (Image courtesy Mike Ziobro and Brandon Aydlett, WFO Guam)

NOAA-20 has viewed the launch from Tanegashima Island of a Japanese Spacecraft (NASA Blog Coverage; YouTube video, launch is at minute 35 in the video). Brandon Aydlett, NWS Guam, noted the appearance of a very bright spot in the Day Night Band imagery from NOAA-20 at 1602 UTC on 24 September (and a hot spot as well in the infrared imagery shown below). (NOAA-20 and Suomi-NPP data in this blog post were downloaded at the Direct Broadcast Antenna at the Forecast Office in Guam). NOAA-20 Orbital passes (from this site) show an overpass near the island at 1605 UTC; Suomi NPP had a more direct overpass over the island around 1657 UTC. Compare the NOAA-20 image, above, timestamped 1602 UTC, to the Suomi NPP image, below, timestamped at 1654 UTC. The bright signal over Tanegashima at 1602 UTC is missing from the 1654 UTC Suomi NPP imagery.

Suomi-NPP Day Night Band visible imagery (0.7 µm) at 1654 UTC on 24 September 2019 (Click to enlarge) (Image courtesy Mike Ziobro and Brandon Aydlett, WFO Guam)

Infrared Imagery captured the thermal signature of this launch as well. The hot spots in VIIRS imagery are obvious at 1602 UTC from NOAA-20, but not at 1654 UTC from Suomi NPP, at both 3.74 and 11.45, as shown below.

VIIRS shortwave infrared (3.74 µm) imagery at 1654 UTC (left) and at 1602 UTC (center, right, with two different color enhancements). Blown-up versions of the warm pixels are shown (Click to enlarge) (Image courtesy Mike Ziobro and Brandon Aydlett, WFO Guam)

VIIRS infrared (11.45 µm) imagery at 1654 UTC (left) and at 1602 UTC (right, same color enhancements). Blown-up versions of the warm pixels are shown (Click to enlarge) (Image courtesy Mike Ziobro and Brandon Aydlett, WFO Guam)

 

Himawari-8 shortwave infrared imagery also captured the launch, with a hot spot in a Japan Sector image at 1605 UTC on 24 September 2019, below.

Himawari-8 shortwave infrared (3.9 µm) imagery from 1600-1610 UTC on 24 September 2019 (Click to enlarge). Himawari data courtesy of JMA.

There is a considerable parallax shift in the NOAA-20 imagery, as the VIIRS instrument is scanning at the limb in the image, and the rocket at the time was very high in the atmosphere. The parallax shift in the Himawari-8 imagery is less noticeable.