Severe weather in Kansas, Nebraska and Iowa

May 1st, 2018 |

GOES-16

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

Severe thunderstorms produced tornadoes, large hail and damaging winds across parts of Kansas, Nebraska and Iowa on 01 May 2018. A Mesoscale Domain Sector  provided images at 1-minute intervals — SPC storm reports are plotted on 0.64 µm “Red” Visible images (above) and 10.3 µm “Clean” Infrared Window images (below).

GOES-16

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

Many of the storms exhibited cloud-top signatures commonly associated with severe weather — for example, pronounced “enhanced-v” signatures with “cold/warm thermal couplets” were seen on Infrared imagery with the tornado-producing storms in northern Kansas and southern Nebraska (below), and both a well-defined “overshooting top” and an “above-anvil plume” were seen on Visible imagery with the Nebraska storm.

GOES-16

GOES-16 “Red” Visible (0.64 µm) and “Clean” Infrared Window (10.3 µm) images, with SPC storm reports [click to enlarge]

Valley fog and mountain snow in the Catskills of New York

May 1st, 2018 |

As pointed out by NWS Binghamton, valley fog and higher-elevation snow cover was apparent on GOES-16 (GOES-East) Visible imagery in the Catskills of southeastern New York on the morning of 01 May 2018. A closer view comparing GOES-16 “Red” Visible (0.64 µm) and Near-Infrared “Snow/Ice” (1.61 µm) images (below) showed the dissipation of the valley fog, followed by the melting of the snow cover in higher terrain (snowfall amounts of up to 3-4 inches fell in the area on 29 April). The Snow/Ice imagery was helpful in discriminating between the brighter valley fog features and the darker snow cover.

GOES-16

GOES-16 “Red” Visible (0.64 µm, left) and Near-Infrared “Snow/Ice” (1.61 µm, right) images, with hourly plots of surface reports [click to play animation | MP4]

A 250-meter resolution Terra MODIS True-color Red-Green-Blue (RGB) image acquired from the SSEC Direct Broadcast ground station (below) showed the remaining snow cover over the Catskills (near the center of the image) at 1539 UTC.

Terra MODIS True-color image [click to enlarge]

Terra MODIS True-color image [click to enlarge]