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Investigation of Microphysics and Precipitation for Atlantic
Coast-Threatening Snowstorms (IMPACTS)

From the the ESPO IMPACTS Site..."

(IMPACTS) will fly a complementary suite of remote sensing and in-situ instruments for three 6-week deployments on the ER-2 and P-3 aircraft. IMPACTS will address three specific objectives, providing observations critical to understanding the mechanisms of snowband formation, organization, and evolution. IMPACTS will also examine how the microphysical characteristics and likely growth mechanisms of snow particles vary across snowbands. IMPACTS will improve snowfall remote sensing interpretation and modeling to significantly advance predictive capabilities.

In a synergistic effort GPM has deployed a suite of precipitation-measuring instruments to the University of Connecticut (Storrs, CT). The instruments were deployed on Dec. 8, 2021 and it is envisaged that they will remain there through March of 2022.

In addition GPM GV has several instruments located at or near NASA Wallops Flight Facility in support of the Wallops/GPM Precipitation Research Facility. Scroll down the page to learn more about the instruments, measurements and locations.

Micro Rain Radar

Latest daily plot from MRR2-03 located in Storrs, CT (U.Conn)

According to Metek...

The Micro Rain Radar MRR at 24 GHz is a unique meteorological radar profiler for Doppler spectra of hydrometeors in height ranges 15 m 6000 m. The high resolution in time and height enables the MRR to monitor the genesis of frozen hydrometeors, the melting zone (bright band) and the formation of rain drops. With the derived rain rate the MRR offers a calibration of weather radar. The MRR has been adapted even for monitoring of avalanches and volcanos.

View some MRR plots...

Monthly CK Grid

Daily MRR Plots

NOTE: Monthy Summary Plot format adapted from similar product introduced by Dr. Chris Kidd (


Latest All-in-One wind and state variables from Storrs Ct.

According to MetOne...

The AIO 2 Weather Sensor provides measurements of wind speed, wind direction, ambient air temperature, relative humidity, and barometric pressure in a single, compact, rugged unit. It integrates a folded-path, low-power sonic anemometer with a precision thermistor temperature sensor, fast-response capacitive relative humidity sensor, and a state-of-the-art barometric pressure sensor. It also includes an internal flux-gate compass that allows for automatic alignment of wind direction to magnetic north, regardless of the sensors orientation.

Click Here or on image to the left to see the latest data.

Or, use these options to view other dayss

Daily All-in-One Plots

Parsivel Disdrometer

According to OTT Hydromet...

The OTT Parsivel is a modern laser disdrometer for comprehensive measurement of all precipitation types. The Parsivel captures both the size and speed of falling particles, classifying them into one of 32 separate size and velocity classes. The raw data are used to calculate the type, amount, intensity and kinetic energy of the precipitation, the visibility in the precipitation, and the equivalent radar reflectivity

Daily Rain Plots (Parsivel)

Daily Dsd Plots (Parsivel)

Two-Dimensional Video Disdrometer (2DVD)

The 2DVD was designed and sold by Joanneum Research. It uses two orthogonal cameras to image precipitation size, shape and fall speed. For a more complete description of the 2DVD see this paper by Kruger and Krajewski (2002)

Daily Rain Plots (2DVD)

Daily Dsd Plots (2DVD)

Precipitation Imaging Package (PIP)

The NASA Precipitation Imaging Processor (PIP) is an instrument designed by Dr. Larry Bliven at NASA Wallops Flight Facility. Its high-frame-rate records of grey-scale images is able to determine both particle size and fall-speed measurements in both rain and snow. The current model has a frame rate of nearly 400 Hz over a 640 x 480 pixel window. Current efforts are underway to increase the rate to 1000 Hz at 1080p HD resolution (1920 x 1080 pixels.

Daily 4-panel PIP Plots

Pluvio Weighing (Snow) Gauge

According to OTT Hydromet...

The OTT Pluvio is an all-weather precipitation gauge that uses superior weight-based technology to measure the amount and intensity of rain, snow, and hail. Developed in conjunction with industry-leading meteorological services, the OTT Pluvio employs a high-precision load cell and algorithms that compensate for wind, temperature, and evaporation, ensuring the highest accuracy precipitation measurements over time.

Other Useful Links

GPM Wallops- and UConn-Based Instruments Supporting IMPACTS

Supporting text

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