This website works best with a newer web browser such as Chrome, Firefox, Safari or Microsoft Edge. Internet Explorer is not supported by this website.

CIMSS Satellite Blog

MENU

Derecho from the Midwest to the Mid-South

By Scott Bachmeier •

GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) showed a large Mesoscale Convective System (MCS) which produced a long-lived path of large hail and damaging winds from eastern Nebraska to western Tennessee on 28 June 2018. The length and duration of damaging wind events (SPC storm reports) qualified this event as a derecho.The corresponding GOES-16... Read More

GOES-16

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

GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (above) showed a large Mesoscale Convective System (MCS) which produced a long-lived path of large hail and damaging winds from eastern Nebraska to western Tennessee on 28 June 2018. The length and duration of damaging wind events (SPC storm reports) qualified this event as a derecho.

The corresponding GOES-16 “Clean” Infrared Window (10.3 µm) images (below) revealed cold cloud-top infrared brightness temperatures that occasionally reached -80ºC (violet enhancement).

GOES-16 "Clean" Infrared Window (10.3 µm) images, with SPC storm reports plotted in cyan [click to play MP4 animation]

GOES-16 “Clean” Infrared Window (10.3 µm) images, with SPC storm reports plotted in cyan [click to play MP4 animation]

A closer look at the MCS using 375-meter resolution Suomi NPP VIIRS Infrared Window (11.45 µm) images (below) showed cloud-top gravity waves on the 1844 UTC image, propagating radially outward from the primary area of overshooting tops; cloud-top infrared brightness temperatures were as cold as -86ºC (violet enhancement).

Suomi NPP VIIRS Infrared Window (11.45 µm) images, with SPC storm reports plotted during the 3 hours preceding the 1844 UTC image [click to enlarge]

Suomi NPP VIIRS Infrared Window (11.45 µm) images, with plots of SPC storm reports during the 3 hours preceding the 1844 UTC image [click to enlarge]

View only this post Read Less

River valley fog in the Upper Midwest

By Scott Bachmeier •

Comparisons of NOAA-20 and Suomi NPP VIIRS Day/Night Band (0.7 µm) and “Fog Product” Infrared Brightness Temperature Difference images (above) showed the nighttime formation of river valley fog in parts of the Mississippi River and its tributaries in Minnesota, Wisconsin and Iowa on 28 June 2018.  Due to ample illumination... Read More

NOAA-20 VIIRS Day/Night Band (0.7 µm) and

NOAA-20 VIIRS Day/Night Band (0.7 µm) and “Fog Product” Infrared Brightness Temperature Difference (11.0 – 3.7 µm) images, with plots of Ceiling and Visibility [click to enlarge]

Suomi NPP VIIRS Day/Night Band (0.7 µm) and "Fog Product" Infrared Brightness Temperature Difference (11.0 - 3.7 µm) images, with plots of Ceiling and Visibility [click to enlarge]

Suomi NPP VIIRS Day/Night Band (0.7 µm) and “Fog Product” Infrared Brightness Temperature Difference (11.0 – 3.7 µm) images, with plots of Ceiling and Visibility [click to enlarge]

Comparisons of NOAA-20 and Suomi NPP VIIRS Day/Night Band (0.7 µm) and “Fog Product” Infrared Brightness Temperature Difference images (above) showed the nighttime formation of river valley fog in parts of the Mississippi River and its tributaries in Minnesota, Wisconsin and Iowa on 28 June 2018.  Due to ample illumination from the Full Moon, the Day/Night Band provided a “visible image at night” with better fog detail in some areas than was seen using the traditional “Fog Product”. (Note: the NOAA-20 images are incorrectly labeled as Suomi NPP)

A toggle between NOAA-20 and Suomi NPP VIIRS Day/Night Band images acquired by the SSEC Direct Broadcast ground station (below) revealed increased fog formation over portions of the Mississippi River between Rochester MN and Madison WI during the 52 minutes separating the two images.

NOAA-20 and Suomi NPP VIIRS Day/Night Band (0.7 µm) images [click to enlarge]

NOAA-20 and Suomi NPP VIIRS Day/Night Band (0.7 µm) images [click to enlarge]

During the subsequent daylight hours, GOES-16 (GOES-East) “Red” Visible (0.64 µm) images (below) showed that the fog dissipated by 15 UTC or 10am local time.

GOES-16

GOES-16 “Red” Visible (0.64 µm) images, with hourly plots of surface weather type [click to play animation | MP4]

GOES-16 Natural Color Red-Green-Blue (RGB) images are shown below.

GOES-16 Natural Color RGB images [click to play MP4 animation]

GOES-16 Natural Color RGB images [click to play MP4 animation]

View only this post Read Less

Pyrocumulonimbus cloud from the Spring Fire in southern Colorado

By Scott Bachmeier •

GOES-16 “Red” Visible (0.64 µm), Shortwave Infrared (3.9 µm) and “Clean” Infrared Window (10.3 µm) images (above) showed the Spring Fire which began burning just west of La Veta Pass (station identifier KVTP) in south-central Colorado on 27 June 2018. The fire produced a small pyrocumulonimbus (pyroCb) cloud around 0100 UTC, which drifted slowly to... Read More

GOES-16

GOES-16 “Red” Visible (0.64 µm, top), Shortwave Infrared (3.9 µm, middle) and “Clean” Infrared Window (10.3 µm, bottom) images, with hourly plots of surface reports [click to play animation | MP4]

GOES-16 “Red” Visible (0.64 µm), Shortwave Infrared (3.9 µm) and “Clean” Infrared Window (10.3 µm) images (above) showed the Spring Fire which began burning just west of La Veta Pass (station identifier KVTP) in south-central Colorado on 27 June 2018. The fire produced a small pyrocumulonimbus (pyroCb) cloud around 0100 UTC, which drifted slowly to the northeast. The 10.3 µm cloud-top infrared brightness temperature cooled below the -40ºC (lime green enhancement) pyroCb threshold.

===== 29 June Update =====

NOAA-20 VIIRS Day/Night Band (0.7 µm), Shortwave Infrared (3.75 µm and 4.05 µm) and Near-Infrared (1.61 µm and 2.25 µm) images [click to enlarge]

NOAA-20 VIIRS Day/Night Band (0.7 µm), Shortwave Infrared (3.75 µm and 4.05 µm) and Near-Infrared (1.61 µm and 2.25 µm) images [click to enlarge]

A nighttime comparison of NOAA-20 VIIRS Day/Night Band (0.7 µm), Shortwave Infrared (3.75 µm and 4.05 µm) and Near-Infrared (1.61 µm and 2.25 µm) images at 0852 UTC or 2:52 am MST on 29 June (above; courtesy of William Straka, CIMSS) showed the visible and thermal signatures of the Spring Fire. With ample illumination from the Moon (in the Waning Gibbous phase, at 98% of full), the hazy signature of smoke could be seen drifting northeastward past the Colorado/Kansas border.

View only this post Read Less

Eruption of the Sierra Negra volcano in the Galapagos

By Scott Bachmeier •

Onset of the #SierraNegra #eruption (#Galapagos) in the afternoon of June 26 captured by GOES & other satellites. The previous two Sierra Negra eruptions (1979 & 2005) both emitted a lot of SO2. Source: @NOAA/@UWCIMSS volcanic cloud monitoring system; https://t.co/OZWmWBOVs9 pic.twitter.com/Gg3Yqw6pp3 — Simon Carn (@simoncarn) June 27, 2018 GOES-16 (GOES-East) “Clean”... Read More

GOES-16 (GOES-East) “Clean” Infrared Window (10.3 µm), Mid-level Water Vapor (6.9 µm) and Low-level Water Vapor (7.3 µm) images beginning late in the day on 26 June 2018 (below) showed that a signature of the volcanic plume was evident in the 7.3 µm imagery for several hours after it was no longer seen in the 10.3 µm or 6.9 µm imagery — this is due to the fact that the 7.3 µm spectral band is also sensitive to SO2 absorption (and this volcanic eruption produced large amounts of SO2).

GOES-16

GOES-16 “Clean” Infrared Window (10.3 µm, top), Mid-level Water Vapor (6.9 µm, middle) and Low-level Water Vapor (7.3 µm, bottom) images [click to play animation | MP4]

View only this post Read Less

  • last_page First
  • Last last_page

Search blog