IMERG Rainfall Totals from Eta & Iota, November 1 - 18
The record-breaking 2020 Atlantic hurricane season, aided by the ongoing La Niña, is officially the most active Atlantic hurricane season on record, surpassing the 2005 season in the total number of named storms with 30 to date. Incredibly, the latest storm Iota wasn’t just another named storm, but a powerful Category 5 hurricane and the strongest storm of the season. It was also only the 2nd Category 5 storm to occur in the month of November on record, the other being in 1932. The warm waters of the Caribbean continue to serve as a breeding ground for late-season storms this season. Iota
Landslide Risk in Central America
On November 3, 2020, Hurricane Eta made landfall as one of the most powerful hurricanes to hit Central America in years. The category 4 storm destroyed hundreds of homes, killed more than 100 people, and brought torrential rains that triggered large and numerous landslides in Guatemala and Honduras. Less than two weeks later, Hurricane Iota—an even more powerful category 4 storm—nearly retraced Eta’s path. Within hours of Eta’s landfall and flooding rains, researchers at NASA’s Goddard Space Flight Center worked to predict landslides and map the storm’s aftermath. One team assessed potential

What effect do mountainous regions have on measuring precipitation? (orographic precipitation)

Wind flow up a mountain tends to enhance precipitation – when the air moves higher into the atmosphere it is cooled, which drops the saturation dew point, and therefore tends to make more moisture available.  Wind blowing down the mountain does the opposite.  If the atmosphere is sufficiently unstable, the lift provokes deep convection.  But in less convective situations, the extra moisture is squeezed out in the lowest layers of the atmosphere, mostly as the entirely liquid “warm rain process”.

In what sense is the entire record for each Run (Early, Late, Final) processed “consistently”?

The entire record for each Run (Early, Late, or Final) is computed with the same version of processing, with the same input steams specified for that Run.  The data that are processed afresh are called “Initial Processing” (IP) and those that processed after the fact when the new version starts are called “retrospective processing” (RP).  The RP have a couple of simplifications that the team doesn’t believe are important, but should be mentioned for completeness:

Drop Size Distribution Measurements in Outer Rainbands of Hurricane Dorian at the NASA Wallops Precipitation-Research Facility

Submitted by LisaN on Sun, 11/15/2020
Publication Year
Authors
Thurai, M., V. N. Bringi, D. B. Wolff, D. A Marks, and C. S. Pabla
Journal
atmosphere
Volume
11(6)
Page Numbers
578
DOI
10.3390/atmos11060578
Mission Affiliation
Major Category

The Precipitation Imaging Package: Assessment of Microphysical and Bulk Characteristics of Snow

Submitted by LisaN on Sun, 11/15/2020
Publication Year
Authors
Pettersen, C., L. F. Bliven, A. von Lerber, N. B. Wood, M. S. Kulie, M. E. Mateling, D. N. Moisseev, S. J. Munchak, W. A. Petersen, and D. B. Wolff
Journal
atmosphere
Volume
11(8)
Page Numbers
785
DOI
10.3390/atmos11080785
Mission Affiliation
Major Category

The GPM Validation Network and Evaluation of Satellite-Based Retrievals of the Rain Drop Size Distribution

Submitted by LisaN on Sun, 11/15/2020
Publication Year
Authors
Gatlin, P., W. A Petersen, J. L. Pippitt, T. A Berendes, D. B. Wolff, and A. Tokay
Journal
atmosphere
Volume
11(9)
Page Numbers
1010
DOI
10.3390/atmos11091010
Mission Affiliation
Major Category
GPM Overpass of Hurricane Eta Nov. 11 2020
After a long and meandering journey over Central America, across central Cuba, and through the Florida Keys, Eta, the 28th named storm and 12th hurricane of the 2020 Atlantic hurricane season, wound up nearly stationary as a moderate tropical storm in the southeastern Gulf of Mexico just north of the western tip of Cuba on the morning of November 10th. Before long however, a deep layer trough located over the western third of the US began to shift eastward, and by the afternoon of the 10th, it started to pull Eta back towards the north and the west coast of the Florida peninsula. As it did so