In the Midwest, where a snowstorm started Monday, up to 12 inches (30 centimeters) of snow could blanket a broad area stretching from southeastern Colorado all the way to the Upper Peninsula of Michigan, including western Kansas, eastern Nebraska, large parts of Iowa, northern Missouri and northwestern Illinois, said Bob Oravec, a forecaster with the National Weather Service in College Park, Md. A person clears snow from their car during a snowstorm in Des Moines Iowa on Tuesday, Jan.Snow covers the ground during a snowstorm in Des Moines Iowa on Tuesday, Jan.( Chris Machian /Omaha World-Herald via AP) Omaha police and a tow truck respond to an accident on I480 in Omaha, Neb on Tuesday, Jan.(Chris Machian /Omaha World-Herald via AP) A rider gets off a bus on Harney Street during a snowstorm in downtown Omaha, Neb, on Tuesday, Jan.A couple walks a dog as snow falls in downtown Des Moines, Iowa, Tuesday, Jan.The Des Moines river is visible as snow falls in downtown Des Moines, Iowa, Tuesday, Jan.It was the first significant snowfall of this winter in the area. Matt Stilwell of Des Moines, Iowa, uses a snowblower to clear his driveway and sidewalk at him home Tuesday, Jan.A sprawling storm has hit the South with strong thunderstorms and tornado warnings that blew roofs off homes and tossed about furniture in the Florida Panhandle and brought cities across the Midwest to a standstill with more than half of foot of snow. This photo provided by Bay County Sheriff’s Office shows storm damage around around Panama City Beach, Fla., in Bay County, early Tuesday, Jan.Bright reflectivity returns that are stationary and appear during both calm and inclement weather are usually land-based obstructions such as mountains, trees, or especially wind farms (nothing gets electromagnetic signals confused like spinning metal blades!).This is helpful for picking out snow/mix/rain transition zones In all snow situations, dBZ values of 40 indicate 3-4”/hr snowfall rates and whiteout conditions. Anything larger than this is usually due to “bright banding” where the radar is seeing the part of the atmosphere where snowflakes are clumping together and melting into raindrops. In cold climates during the winter months, actual dBZ values rarely exceed 40.This is your standard radar data that shows precip or other solid/liquid particles in the atmosphere. The first type of data currently available is reflectivity. We currently have two types of radar data available with plans to add more soon. Use radar data with caution especially if your area of interest is far from the nearest radar location! A lot can happen between 0 and 5,000 feet and therefore the depiction of precipitation given by radar may differ some from what’s actually happening on the ground. Because of this phenomenon, the radar beam will only see precipitation falling through the mid levels of the atmosphere. To see this in action, imagine a circle (earth) with a straight line emanating from some point on the circle if you continue this line out into space, it will gradually get farther and farther from the circle. Because the earth is round and the radar beam is flat, the farther away from the radar tower the beam (energy) travels, the farther removed from the ground becomes. There is a notable constraint to radar data though. This is the highest resolution radar data available which enables you to see features such as sea breeze or outflow boundaries that standard resolution radar entirely misses. This data is gathered from over a hundred radar towers located across the US. Lake Murray, Ardmore OK (WeatherOK, USA).Lightning CG worldwide (since 2004) Plus.Base reflectivity (with archive since 1991).Radar & Lightning Radar & Lightning Radar.
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