1. Home

Are there multiple GEO-IR or passive microwave (PMW) samples that contribute to the values within each IMERG grid-box, and if so, are these source data available from the PPS?

The most frequent number of samples of PMW data for an IMERG grid box in any given 30-minute period is overwhelmingly zero, with one in most of the rest. In a very few cases there are two or more. However, the histogram of single values of precipitation rate differs substantially from histograms of two, three, or four averaged together. Once the team realized this several IMERG versions ago, they instituted a down-select scheme to provide the single "best" PMW estimate in each grid box at each time.

IMERG V07 Delay

The IMERG V07 algorithm release has been delayed as the team works to address some artifacts discovered during the development process. Currently, a near-complete version of the algorithm is in the integration and testing phase at NASA's Precipitation Processing System (PPS). The IMERG team has also decided to run the Final V07 version first to obtain information that will be useful in the near real-time IMERG V07 Early and Late products. As a result, the Early and Late products will continue to process as IMERG V06 for several months after the Final shifts to Version 07. Please continue to

GPM products will interrupt during the satellite safe-mode patch installation on Tuesday April 18, 2023

On Tuesday April 18, 2023 at 12:00 UTC the GPM Flight Operations Team will be uploading a firmware update to the GPM satellite. During this time the instruments will be shut down and the spacecraft will be put into sun acquisition mode. No science data will be available until the spacecraft is commanded back into Mission Science Mode. Instruments are expected to be back to nominal operations by 20:00 UTC. It will take additional time for PPS production to ingest and verify the data before processing restart. We will provide an update when activities are complete and nominal production has

Long-lived Tropical Cyclone Freddy Brings Heavy Rain and Flooding to Madagascar and Mozambique

IMERG rainfall totals from Cyclone Freddy
Friday, March 3, 2023
Tropical Cyclone Freddy first made landfall along the east coast of Madagascar just north of the town of Mananjary on Feb. 21, 2023, as a Category 3 cyclone with average winds reported at ~81 mph (130 km/h) and gusts up to ~112 mph (180 km/h). After crossing over Madagascar Freddy continued westward over the Mozambique Channel before making landfall again along the east coast of Mozambique just south of Vilankulos as a moderate tropical storm with sustained winds estimated at 50 mph. Despite being weaker at landfall, Freddy caused widespread flooding across parts of Mozambique due to the storm stalling out near the coast after making landfall. Incredibly, Freddy drifted back out over the Mozambique Channel, nearly making landfall along the southwest coast of Madagascar. It then changed direction, re-intensified, weakened, re-intensified one last time, and made landfall once again on March 11 near Quelimane, Mozambique, as a Category 1 cyclone with sustained winds reported at 90 mph.
Read More

Join the 2023 GPM Mentorship Program

Thumbnail
Wednesday, January 18, 2023
The second edition of the Global Precipitation Measurement Mission (GPM) Mentorship program is now open for registration. Limited seats are available.
Read More
Subscribe to