Month: October 2019

Water vapor imagery in an extremely dry airmass – 31 October 2019

by Dan Bikos on October 31st, 2019

On 31 October 2019 a very dry airmass existed over the southwest US.  To illustrate the dry airmass, consider the sounding from Albuquerque, NM with a precipitable water amount of 0.05″ (1.27 mm): The synoptic scale pattern was characterized by above normal PW in the east ahead of a trough, with below normal PW in Continue Reading

GOES R POES Satellites

21 October 2019 – nighttime detection of fog and outflow boundaries

by Dan Bikos on October 21st, 2019

During the overnight hours of 21 October 2019, we analyze multiple applications of GOES imagery at night. First, we look over the northeast where fog developed.  Here is the GOES-16 nighttime microphysics product: http://rammb.cira.colostate.edu/templates/loop_directory.asp?data_folder=training/visit/loops/21Oct19/fog&loop_speed_ms=60 We observe large areas of fog (dull aqua) or low clouds (aqua) in Pennsylvania, New York, Vermont, New Hampshire and Massachusetts.  Continue Reading

Aviation Weather Ceilings Convection Fog Severe Weather Visibility

CIRA ALPW Comparison for Two Northeast US Heavy Precipitation Events

by Dan Bikos on October 17th, 2019

By Sheldon Kusselson ALPW loop of 2019 event: ALPW loop of 2017 event:

Coastal Effects Cyclogenesis Heavy Rain and Flooding Issues Hydrology POES Satellites

Subtropical storm Melissa

by Dan Bikos on October 11th, 2019

By Sheldon Kusselson and Dan Bikos Subtropical storm Melissa exists off the Eastern coastline of the U.S. on 10-11 October 2019, as GOES-16 visible imagery on 11 October shows: http://rammb.cira.colostate.edu/templates/loop_directory.asp?data_folder=training/visit/loops/11Oct19/vis&loop_speed_ms=60 note the lack of deep convection over the center of the circulation, however convection does exist north and northeast of the center at this time. Continue Reading

Heavy Rain and Flooding Issues Tropical Cyclones