GFS Forecast for 3/18
GFS Forecast for 3/27
In the picture above, that snow showing up in Tennessee, Alabama and Georgia is possible but unlikely. I think it will end up being right over Indiana.
Here is what the National Weather Service is saying about long range forecast:
.LONG TERM (Wednesday through Monday)... Issued at 254 AM EDT Tue Mar 12 2024 Wednesday into Thursday Night... A weakening upper short wave will move into the area Wednesday. Deep moisture will be lacking. Thus, any showers that survive into central Indiana Wednesday morning should weaken or dissipate completely. Will have some slight chance PoPs during the morning, but will go dry in the afternoon with the lack of any forcing. Wednesday night into Thursday morning, a warm front will move northeast through the area. A low level jet will bring moisture and forcing along with the warm front. Thus, will go with likely PoPs over much of the area later Wednesday night and likely or higher PoPs all areas Thursday morning. Questions then arise for additional forcing Thursday afternoon before a low pressure system brings widespread forcing Thursday night. Some models indicate upper energy moving through Thursday afternoon, sparking off some showers and storms. Others keep best chances for rain near the warm front across northern Indiana. With the uncertainty, will not deviate much from blended guidance`s low likely PoPs north (closer to the warm front) and chance PoPs south. Will go likely PoPs Thursday night as the low pressure system interacts with plentiful moisture and a continued low level jet. If the atmosphere can recover from Thursday morning`s rainfall, instability and shear will be high enough for a conditional severe thunderstorm threat later Thursday afternoon into Thursday night. Uncertainty remains high though given impacts from morning rain as well as potential interference from stronger convection to the south and west of central Indiana. Warm air will remain across central Indiana with highs in the 60s to lower 70s and lows in the 50s. Friday and Saturday... A cold front will move through on Friday, but best moisture will be east of the area. Will keep some lower PoPs around, mainly Friday morning. Friday night and Saturday, the area will be in between systems and dry. Saturday night and beyond... An upper trough will approach the area through Sunday and then move in for Monday. Ahead of it, a cold front will move through on Saturday night. Moisture will be mainly tied up to the south with a southern system, Will go dry most areas through Sunday. As cold air aloft moves in with the upper trough on Monday, a few snow/rain showers will be possible. Temperatures will fall to below normal on Monday, with highs only in the lower to middle 40s. Monday night`s lows will be in the 20s. Models are hinting at the cold temperatures may not last as long as previously thought, with zonal flow potentially returning by Thursday the 21st.
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