IMERG

Drought and the Australia Wildfire Season

Surface rainfall accumulations (mm) estimated from the NASA IMERG satellite precipitation product from 1 to 30 November 2019 over Australia and the surrounding waters.

Droughts and dry, arid conditions are naturally occurring phenomena in Australia.  Such an environment is conducive to wild fires, which are started mainly by lightning and can occur throughout the year, but typically emerge between October and April and are most prevalent during the Southern Hemisphere summer; they are part of the seasonal cycle in Australia.  However, some years are worse than others, and the 2019-2020 wild fire season was especially bad.

Early and Late IMERG IR Issues

Difficulties with accessing NOAA CPC 4-km Merged Global IR data resulted in the loss of IR data in IMERG Early Run for 12 November 12:00-21:30 UTC and 14 November 10:00-15 November 10:30 UTC, and in IMERG Late Run for 12 November 12:00-20:30 UTC and 14 November 10:00-15 November 09:30 UTC.  Subsequently, the IR data were retrieved for use in the Final Run.

IMERG Sees a Dry September

IMERG Sees a Dry September

Rainfall was scarce across much of the country in the month of September, pushing the eastern and southern thirds of the country into drought conditions.  IMERG, the Integrated Multi-satellitE Retrievals for GPM, is a unified satellite precipitation product produced by NASA to estimate surface precipitation over most of the globe.  With IMERG, precipitation estimates from the GPM core satellite are used to calibrate precipitation estimates from microwave and IR sensors on other satellites.

Dorian Stalls, Brings Heavy Rain to Bahamas

Hurricane Dorian Brings Heavy Rain to Bahamas

In addition to the powerful winds that have raked the northern Bahamas over the past few days, Hurricane Dorian’s slow motion has brought very heavy rainfall to the islands as well.  Dorian first formed into a tropical depression on the 24th of August about 800 miles east southeast of Barbados in the Lesser Antilles from an area of low pressure; the depression was quickly upgraded to a minimal tropical storm and named Dorian by the National Hurricane Center (NHC) later in the day.

IMERG Measures Rainfall in Hurricane Dorian

IMERG Measures Rainfall in Hurricane Dorian

UPDATE 9/9/19:

On Monday morning, September 9, Hurricane Dorian was a post-tropical storm after a mid-latitude weather front and cold seas had altered its tropical characteristics over the weekend. On Saturday and Sunday, Hurricane Dorian struck eastern Canada, causing wind damage and bringing heavy rainfall.  According to the Associated Press, a peak of 400,000 people were without power in Nova Scotia, Canada, because of Dorian.

GPM Integrated Multi-Satellite Retrievals for GPM (IMERG) Algorithm Theoretical Basis Document (ATBD) v06

Document File: 
Published Date: 
03/13/2019

This document describes the algorithm and processing sequence for the Integrated Multi-satellitE Retrievals for GPM (IMERG). This algorithm is intended to intercalibrate, merge, and interpolate “all” satellite microwave precipitation estimates, together with microwave-calibrated infrared (IR) satellite estimates, precipitation gauge analyses, and potentially other precipitation estimators at

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