![]() ![]() It appears the pattern is changing though to what ultimately remains a mystery. ![]() Next week it turns cooler in the first half and colder late week as two weather systems are in play. Once the front moves offshore, some sunshine should break out of the clouds and highs will be in the 60s again. The low is going rather far to the northwest of the coast and the upper air energy is not supportive for showers and thunderstorms of any great magnitude for Saturday night into early Sunday morning. Saturday’s highs will reach into the 60s just about everywhere from Eastern Pennsylvania to Southern New England including coastal areas. Temperatures overnight will likely hold in the 40s to near 50. We don’t see any weather issues for tonight into Saturday other than clouds, some patchy fog, and the outside chance for a shower. Temperatures will still manage to get into the upper 40s and lower 50s later this afternoon. We do have a lot of clouds around today and there are some showers moving across upstate NY and Northewest Pennsylvania but they are headed northeastward and we don’t see any issues today other than the clouds. For Eastern Pennsylvania to Southern New England it is all about warm air with the warmest air here for Saturday and Sunday with highs both days in the 60s and record high temperatures forecast. North of there it will be a serious snow and ice storm from the Middle Mississippi Valley to the Great Lakes including Chicago as well as much of Michigan, and then eventually Northern New England. We have a serious severe weather outbreak developing from Texas to Mississippi north to Southern Missouri for today and tonight. A southwest flow is beginning today but this time of year when it warms up it usually comes with a lot of clouds especially when we have a storm developing in Texas that is pulling up very warm tropical air northeastward. The wheels are in motion for a big warm up for the Eastern Seaboard. Since hail can cause the rainfall estimates to be higher than what is actually occurring, steps are taken to prevent these high dBZ values from being converted to rainfall.Springlike Conditions This Weekend Severe Weather South Ice Storm Midwest Hail is a good reflector of energy and will return very high dBZ values. These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Depending on the type of weather occurring and the area of the U.S., forecasters use a set of rainrates which are associated to the dBZ values. ![]() The higher the dBZ, the stronger the rainrate. Typically, light rain is occurring when the dBZ value reaches 20. The scale of dBZ values is also related to the intensity of rainfall. The value of the dBZ depends upon the mode the radar is in at the time the image was created. ![]() Notice the color on each scale remains the same in both operational modes, only the values change. The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). Each reflectivity image you see includes one of two color scales. The dBZ values increase as the strength of the signal returned to the radar increases. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). "Reflectivity" is the amount of transmitted power returned to the radar receiver. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. ![]()
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