Seasonably cool Fall-like temperatures overspread the western Great Lakes and northern Plains on 5 October. The animation above shows the Day Cloud Phase Distinction overlain with LightningCast probability from 1321-1721 UTC on 5 October (that is, 8:21-12:21 CDT). SPC on this day was anticipating general thunder over northern Minnesota. Given that,... Read More

Target Sector (2.5-minute interval) JMA Himawari-9 AHI Clean Infrared Window (10.4 µm) images (above) showed Typhoon Koinu after it reached Category 4 intensity at 0600 UTC (SATCON) on 04 October 2023. The coldest cloud-top infrared brightness temperatures (-80 to -89C, shades of violet to purple) were generally confined to the southern semicircle of the storm.... Read More

The North Texas panhandle is experiencing severe weather on October 4, 2023. Animation 1 shows Radar reflectivity in tight areas of convection across the panhandle. The GOES Day Cloud Phase Distinction RGB shown in Animation 2 confirms convection, showing overshooting tops becoming wispy ice clouds (appearing orange in the RGB).An enhanced risk of convection... Read More

Mostly clear skies over the western Atlantic on 4 October 2023 meant that the Advanced Clear Sky Processor for Oceans (ACSPO) algorithm could produce a near-complete picture of sea-surface temperatures using data from NOAA-20’s VIIRS instrument. The sinuous Gulf Stream is marked as a region of warmest waters, around 85oF... Read More