Northeast weather loop9/28/2023 Forecast Radar The Forecast Radar map shows where area of precipitation are expected to be in the next 20-30 minutes. The same idea applies to the precipitation normal values, except enhanced odds forĪbove- (below-) normal precipitation values are green (brown). Yesterday's Radar Loop shows areas of precipitation for the prior day. If the selected point is within an area of enhanced odds forīelow-normal temperatures, the shading around the normal maximum/minimum temperature will appear blue. If the selected point is withinĪn area of enhanced odds for above-normal temperatures, the shading around the normal maximum/minimum temperature will appear red. Storms packing high winds and flash flooding will sweep away hot air across the Northeast this weekend and will usher in a new weather pattern into early August. The color used to highlight the normal values (precipitation or maximum/minimum temperature) are used to delineate the category of the forecast at the point clicked. What does the highlighting around the normal precipitation or normal maximum/minimum temperature imply? What color scheme is used? The color scheme follows that of the static images for the 6-10 day forecasts and 8-14 day forecasts. Intervening values are linearly interpolated, combined with data from the COOP, and averaged over the 5-day period to createĪverage maximum/minimum temperature normals. For temperatures, monthly average maximum/minimum temperatures are assigned to theġ5th of the current month and subsequent month. These values are then summed over the 5-day period to create total precipitation normals. PRISM data are inherently available as monthly values.įor precipitation, daily average values are calculated (Monthly Total/Number of Days in Month) and combined with data from the Cooperative Observer Network (COOP). ![]() PRISM (Parameter-elevation Regressions on Independent Slopes Model) normals are used in this display. Many thanks to the staff there for developing the prototype and assisting in the transition to CPC.įAQ What climatologies are used in this display? 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.This webpage was developed in conjunction with the Weather Forecast Office in Pendleton, Oregon (WFO PDT). ![]() 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. Radar Radar with Surface Map Radar with U.S. Notice the color on each scale remains the same in both operational modes, only the values change. United States High Resolution 24 Hour Animated Radar Loop National Radar with Rain, Sleet, Hail and Snow Indicated Animation: None 1Hr 2Hr 6Hr 12Hr 24Hr 24hr Radar Loop Options U.S. 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). 22:12 EDT - 02:12 UTC GOES-East - Sector view: Northeast - GeoColor 2 hour loop - 24 images - 5 minute update To enlarge, pause animation & click the image. 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). ![]() ![]() During the day, the imagery looks approximately as it would appear when viewed. Geocolor is a multispectral product composed of True Color (using a simulated green component) during the daytime, and an Infrared product that uses bands 7 and 13 at night. "Reflectivity" is the amount of transmitted power returned to the radar receiver. Northeast Geocolor True Color Visible SatelliteTrue Color daytime, multispectral IR at night. Up to 90 days of daily highs, lows, and precipitation chances. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. Radar Current and future radar maps for assessing areas of precipitation, type, and intensity Currently Viewing RealVue Satellite See a real view of Earth from space, providing a detailed view. Know whats coming with AccuWeathers extended daily forecasts for Como, Lombardy, Italy.
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