Afternoon heat index values are expected to be 100 to 105 degrees Today through Sunday.
Nashville, TN – The National Weather Service (NWS) says there is a potential for severe thunderstorms tonight across Clarksville-Montgomery County as well as Middle Tennessee as a complex of showers and thunderstorms is expected to move into the mid state in association with an established northwesterly upper level flow pattern aloft.
The storm prediction center in Norman, OK has placed locations generally around and northeast of a Erin to Franklin to McMinnville line in an enhanced risk for severe thunderstorms.
Written by Alan Buis
Pasadena, CA – NASA has joined a multi-agency field campaign studying summer storm systems in the U.S. Great Plains to find out why they often form after the sun goes down instead of during the heat of the day.
The Plains Elevated Convection at Night, or PECAN, project began June 1st and continues through mid-July. Participants from eight research laboratories and 14 universities are collecting storm data to find out how and why storms form.
Washington, D.C. – Algae are complicated. The little plants can be both good and bad.
Single-celled algae called phytoplankton are a main source of food for fish and other aquatic life, and account for half of the photosynthetic activity on Earth—that’s good.
But certain varieties such as some cyanobacteria produce toxins that can harm humans, fish, and other animals. Under certain conditions, algae populations can grow explosively — a spectacle known as an algal bloom, which can cover hundreds of square kilometers. For example, in August 2014, a cyanobacteria outbreak in Lake Erie prompted Toledo, Ohio, officials to ban the use of drinking water supplied to more than 400,000 residents.
Written by Patrick Lynch
Washington, D.C. – Ethanol fuel refineries could be releasing much larger amounts of ozone-forming compounds into the atmosphere than current assessments suggest, according to a new study based on a field campaign that included a NASA sensor.
Airborne measurements made downwind from an ethanol fuel refinery in Decatur, Illinois, in 2013 found ethanol emissions 30 times higher than government estimates.
The measurements also showed emissions of all volatile organic compounds (VOCs), which include ethanol, were five times higher than government numbers, which estimate emissions based on manufacturing information.
Written by Rob Gutro
Greenbelt, MD – The ISS-RapidScat instrument has been in orbit seven months, and forecasters are already finding this new eye-in-the-sky helpful as they keep watch on major storms around the globe.
RapidScat measures Earth’s ocean surface wind speed and direction over open waters. The instrument’s data on ocean winds provide essential measurements for researchers and scientists to use in weather predictions, including hurricane monitoring.
Written by Alan Buis
Pasadena, CA – You can’t predict the outcome of a marathon from the runners’ times in the first few miles. You’ve got to see the whole race. Global climate change is like that: You can’t understand it if all you have is a few years of data from a few locations. That’s one reason that a fourth-generation satellite launching this summer is something to get excited about.
Jason-3, a mission led by the National Oceanic and Atmospheric Administration that is currently scheduled to launch on July 22nd, is the latest in a series of U.S.-European satellite missions that have been measuring the height of the ocean surface for 23 years.
Written by Alan Buis
Pasadena, CA – Researchers from several institutions are in the Four Corners region of the U.S. Southwest with a suite of airborne and ground-based instruments, aiming to uncover reasons for a mysterious methane “hot spot” detected from space.
“With all the ground-based and airborne resources that the different groups are bringing to the region, we have the unique chance to unequivocally solve the Four Corners mystery,” said Christian Frankenberg, a scientist at NASA’s Jet Propulsion Laboratory, Pasadena, California, who is heading NASA’s part of the effort.
Written by Karen C. Fox
Greenbelt, MD – The Magnetospheric Multiscale, or MMS, mission is scheduled to launch into space on March 12th, 2015. The mission consists of four spacecraft to observe a phenomenon called magnetic reconnection — which doesn’t happen naturally on Earth all that often, but is a regular occurrence in space.
At the heart of magnetic reconnection is a fundamental physics process in which magnetic field lines come together and explosively realign, often sending the particles in the area flying off near the speed of light.
Written by Rob Gutro
Greenbelt, MD – NASA’s Terra satellite captured an image of the snow-covered eastern U.S. that looks like the states have been sitting in a freezer. In addition to the snow cover, Arctic and Siberian air masses have settled in over the Eastern U.S. triggering many record low temperatures in many states.
On February 19th at 16:40 UTC (11:40am EST), the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument that flies aboard NASA’s Terra satellite captured a picture of the snowy landscape.
Nashville, TN – The Tennessee Emergency Management Agency (TEMA), the Tennessee Department of Safety and Homeland Security, and the Tennessee Department of Transportation (TDOT) urge citizens to avoid unnecessary road travel on Monday as the state prepares for a severe winter storm. Motorists who must drive on Monday are advised to check local forecasts and road conditions before travelling.
Middle Tennessee will be under a Winter Storm Warning starting at 9:00pm, CST, Sunday until 6:00am, CST, Monday. The National Weather Service is forecasting a wintry mixture of snow, sleet and freezing rain at Tennessee’s border with Alabama. Along Tennessee’s border with Kentucky, six inches to 10 inches of snow is possible.
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