Month: February 2019

Low cloud / fog over snow covered ground on 25 February 2019

by Dan Bikos on February 25th, 2019

During the overnight hours of 25 February 2019, low clouds and fog developed over portions of northwest Kansas, eastern Colorado and southwest Nebraska.  The low cloud and fog developed over a field of snow on the ground from a recent blizzard.  Low cloud and fog on top of snow on the ground can be difficult Continue Reading

Ceilings Fog Visibility

Popocatépetl Volcanic Eruption

by Jorel Torres on February 15th, 2019

Popocatépetl Volcano erupted overnight, spewing volcanic ash emissions, from 0200-1600UTC, 15 February 2019. Geostationary and polar-orbiting satellites observed this atmospheric phenomenon from 00-16 UTC, 15 February 2019. GOES-16 3.9um  A hot spot (i.e. white, warm brightness temperature) is produced from the volcanic eruption, along with its ash plume (i.e. elongated, cooler, black, brightness temperatures). Notice Continue Reading

Aviation Weather GOES R POES Satellites Volcano Weather

14 February 2019 California Atmospheric River event

by Dan Bikos on February 15th, 2019

Advected Layer Precipitable Water loop: http://rammb.cira.colostate.edu/templates/loop_directory.asp?data_folder=training/visit/loops/14feb19/alpw&loop_speed_ms=400 Blended Total Precipitable Water loop: http://rammb.cira.colostate.edu/templates/loop_directory.asp?data_folder=training/visit/loops/14feb19/blended_tpw&loop_speed_ms=100 Percent of Normal TPW loop: http://rammb.cira.colostate.edu/templates/loop_directory.asp?data_folder=training/visit/loops/14feb19/blended_percent&loop_speed_ms=100

Heavy Rain and Flooding Issues Hydrology Satellites

VIIRS Captures Ice/Ocean Movements

by Jorel Torres on February 13th, 2019

By Lewis Grasso and Jorel Torres VIIRS captures interesting imagery in the Arctic. From 0314 UTC to 1233 UTC, 13 February 2019, VIIRS, on-board NOAA-20 and S-NPP, imaged fascinating features in the Arctic. In particular, imagery from Band I4 (3.74um) with a sub-satellite footprint size of 375-meters captured several features: 1) oscillation of an ice Continue Reading

Miscellaneous POES Satellites

4 February 2019 significant ice storm in the Upper Great Lakes

by Dan Bikos on February 7th, 2019

On 4 February a shortwave tracked across the Upper Great Lakes towards the east, ahead of the shortwave, anomalously high moisture at low to mid-levels existed which contributed to a historic ice storm for the region. The NWS forecast office in Marquette, MI has a great web-page summarizing this event including pictures and the meteorological Continue Reading

Icing

Observing sea surface temperatures from GOES and JPSS

by Jorel Torres on February 7th, 2019

Observing sea surface temperatures (SSTs) from satellite is an important aspect in weather forecasting for a variety of applications. Applications consist of (but not limited to) forecasting hurricane intensity, sea fog, and convection over the oceans. But remember, oceans are vast, making up ~70% of the Earth’s surface, and more importantly, oceans are remote, where Continue Reading

GOES R Miscellaneous POES