Weather Update – 12/12/17

From NWS Nashville

…Some Wintry Precipitation May Fall, but No Accumulation expected in Middle Tennessee…

With the cold air and precipitation lagging, it seems as though we won’t have any snow accumulations occur in Middle Tennessee this morning. However, several reports around the region have indicated that a wintry mix of precipitation has occurred in some areas, including a few reports of light snow and other reports of sleet.

Again, while no accumulations are expected, some folks along and east of I-65 may see some sleet or light snow. Travels impacts should be minimal as the windy conditions keep area roads dry.

Submitted by KD4WX

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Weather Discussion – 12/6/17

Area Forecast Discussion
National Weather Service Nashville TN
521 AM CST Wed Dec 6 2017

&&

.SHORT TERM…
(Today Thru Fri Night)

Weather across the mid state region today thru Fri night will be characterized by dry conditions and variable sky conditions as the mid state is generally expected to be between any potential precipitation producing systems. Cold air advection is expected to continue across the area also as high pressure influences to our north and west continue to usher in a colder than seasonal normal air mass to the region. One of the quandaries in this short term forecast period centers around cloud coverage amounts, specifically how much high level cloud coverage will persist across the mid state as one main storm track remains to our south and weak upper level disturbances approach from the northwest, especially during the Fri thru Fri night time frame. Per consensus of model solutions, believe greater cloud coverage amounts will remain across southern and eastern portions of area, with decreasing cloudiness to the northwest. Looking at surface obs/satellite imagery just after 12/09Z(3 AM CST), cloudiness prevails and believe that will continue to be the trend thru the mid morning hours. Dissipation is expected as the day progresses as dry and more broad upper level troughing influences build into our region per persistence of vertically stacked sfc/upper level low pressure systems centered across the Hudson Bay Region that is expected to continue moving slowly northeastward and pronounced ridging influences surface/aloft continuing across the western contiguous U.S. A reinforcing weak and dry surface cold front will move thru the mid state region during the daylight hours on Thu. Another weak and dry surface cold front will approach the mid state region from the upper Mississippi River Valley by late Fri night. Earlier model run consensus suggested the potential of a more pronounced upper level disturbance moving into the mid state region Fri night resulting in the potential of wintry precipitation. However, timing at this point shows that the best moisture, weak instability and lifting potential for any potential snowfall will shift to after the Fri night time frame. Continue reading

GOES-16 Satellite

William, KW1LL, passed along this information about the GOES-16 satellite. It is the first lighting mapper in geosynchronous orbit. He thought this could be interesting to club members, especially to those who are involved with severe weather nets. Links below.

http://www.usatoday.com/story/weather/2017/03/06/lightning-detection-satellite/98778554/

http://www.goes-r.gov/mission/firstGLM_images.html