Although the significant convection stayed well south of the IFloodS area of study on the evening of 28 May, the multiple wavelength radars at the NPOL site captured the large anvil spreading out from the convection and the associated undulations beneath, known as mammatus. Mammatus clouds are often (but not necessarily) associated with severe weather […]
When I heard that student volunteers were needed for IFloodS, I knew I wanted to take part. I had had little experience with fieldwork in the past. Most of my graduate work has been spent in front of a computer, conducting data analysis and performing hydrological modeling. I had difficulty visualizing the information I was […]
Finding a location for two of the four University of Iowa XPOL radars was easy. They will remain at their current home base locations near Iowa City and Cedar Rapids overlooking the Clear Creek Watershed for the IFloodS campaign. For the other two destined for the Turkey River basin in northeast Iowa — well, there […]
Last year, when working with the NASA GPM team in the planning stages for the Iowa Flood Studies project, more affectionately known as IFloodS, I worried — a lot. 2012 was a year of historic drought in Iowa. IFloodS is all about studying and measuring precipitation. What if drought continued into 2013? In short, what […]
The big science highlight so far is that over May 2 through May 4, the GPM Ground Validation team finally collected a coordinated, co-scanned multi-radar frequency and dual-polarimetric dataset with the D3R and NPOL radars and we did it in one of the most complex multi-day precipitation events that we’ll measure in mid and high […]
Our forecasters at Iowa State, and I believe via the National Weather Service, are calling this a “once in a career storm.” The heavy snow in central Iowa—really, almost on top of us right now, is the reason. We ran NPOL all night long with the D3R radar in cold rain that started around 2 […]
We have been waiting for rain at the NPOL site. Yesterday evening it got very close- within 50 km or so. In the interim, we were waiting for convective cells to develop along what is called a radar “fine-line”. Fine-lines are little boundaries in the lowest part of the atmosphere associated with small changes in […]
A rain gauge will collect how much rain falls, but how exactly do scientists measure the size, shape, and fall speed of raindrops near the ground? Patrick Gatlin of NASA’s Marshall Space Flight Center, sent us a couple photos from Iowa of the instrument that does exactly that: a two-dimensional video disdrometer. Shaped like a […]
Walt Petersen is the Ground Validation Scientist for the Global Precipitation Measurement (GPM) mission, based at NASA’s Wallops Flight Facility in Virginia. He manages all of GPM’s ground validation operations, the field campaigns that ensure that satellites measure rainfall and precipitation from space accurately. From May 1 to June 15, he is leading the Iowa […]
By Clément Miège Hi there! Today I have another story to share with you! It’s about the tracking of the temperature evolution of the firn aquifer temperature by using two thermistor strings that we set up in the two holes made by Jay (see Jay’s post on drilling for details). By tracking temperatures over a […]
