The NOAA National Severe Storms Laboratory and The University of Oklahoma's Cooperative Institute for Mesoscale Meteorological Studies needs your help with severe weather research!

The Meteorological Phenomena Identification Near the Ground project (mPING) needs you, the Citizen Scientist, to watch and report on precipitation.

mPING is looking for volunteers of all ages and backgrounds to make observations - teachers, classes, families, everyone, and anyone! This app is your portal for providing observations to researchers at NSSL. Your reports will help them develop and refine algorithms that use the newly upgraded dual-polarization NEXRAD radars to detect and report on the type of precipitation that you see falling. To do a good job, we need tens of thousands of observations from all over the US. We can succeed only with your help.

mPING volunteer observers can spend as much time as they want, from a little to a lot, making observations. The basic idea is simple: NSSL will collect radar data from NEXRAD radars in your area along with sounding data from our models during storm events, and use your data to develop and validate new and better algorithms. We have two focus areas: winter precipitation types, such as rain, freezing rain, drizzle, freezing drizzle, snow, graupel, ice pellets, mixed rain and snow, mixed ice pellets and snow and even observations of “none” when the precipitation has stopped, even if only briefly.

Why? Because the radars cannot see close to the ground at far distances and because automated surface sensors are only at airports. But the people affected by winter weather are everywhere so we need you to tell us what is happening where you are.

But we need more than winter weather details: when there are thunderstorms, we need to know if hail falls and, if it does, how big it is. Measuring with a ruler is best but, whatever you do, stay safe.

All you need to do is use this app to select the precipitation type. Tell us what is hitting the ground. NSSL scientists will compare your report with what the radar has detected and what our models think the atmosphere is doing, and use it to develop new technologies and techniques to determine what kind of precipitation such as snow, ice, rain or hail and its size is falling where.

What’s New

Version 2.2.2

- Enhanced user experience
- Bug fixes

Ratings and Reviews

3.9 out of 5
75 Ratings

75 Ratings

Kim er ,

Needs state highway numbers for “view reports”

So far the app seems to be a great tool for only complaint (I haven’t been able to locate a “contact or comment section) is it will tell you street names but highway and interstate numbers are not visible on the view reports part of it. When using maps gps it’s hard to coordinate a good route to take without this key piece of information. I anticipate an update that will include this info and make this a 5 Star app for travelers unfamiliar with the area they are in!

msdrpepper ,

Fun App & maybe helpful too?

I got this app with my iPhone 4G and kept using it now with the 5s. There are times I want to report "just barely barely teeny tiny rain" as opposed to the "driving hard gully-washing toad-stranger" types of descriptions. But you science types don't seem to need the quantity... Oh and I miss that map where I could see where else weather was reported (especially when we get those big storms that cover two or three states - like KS & MO or OK & KS etc. I realize the east coast has states that are smaller then some of our counties...).

Gimpelson96 ,

One bad person ruins it for the rest of us

This app is a great app paired with Radar scope. This will allow anyone to submit a weather report in their area to share with others important weather conditions. Unfortunately, some people have taken advantage of it by posting a lot of fake reports spamming the system. Hopefully this issue can be resolved and the app can come back!

Developer Response ,

Hi! Thank you for your support and patience! We greatly appreciate it and are working diligently to eliminate vulnerabilites that allowed false reports to happen. We will announce on the website when mPING is back up:


University of Oklahoma (Information Technology)
9.6 MB

Requires iOS 12.0 or later. Compatible with iPhone, iPad, and iPod touch.


English, Dutch, Estonian, French, Greek, Hungarian, Polish, Portuguese, Serbian, Simplified Chinese, Spanish, Vietnamese

Age Rating


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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