US National Weather Service Memphis Center Weather Service Unit
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09/24/2021
Fog is often hard to see on satellite at night, making it hard to forecast and track early in the day. The new GOES products are making some inroads, though.
Two new products can help, one is the "Nighttime Microphysics" and another is a chart showing probability of "LIFR" or Low Instrument Flight Rules conditions. The LIFR Probability product worked fairly well at Nashville (BNA) this morning as seen compared to the regular visible satellite view.
That hazy look in the sky is more smoke from western wildfires. The smoke is riding the westerlies out of the Pacific Northwest then bending southward into the region along the upper level winds. The "HRRR" model can map the smoke and produce a forecast out several hours. Red is the most intense concentration vertically.
The smoke is aloft over our region and generally not obscuring visibility at the surface.
Smoke from western wildfires continues to end up in the central and eastern parts of the nation. Here's a satellite loop that shows elevated smoke over Kansas being carried southeast behind an upper level trough (which kicked off thunderstorms over eastern Missouri). Airports through the region reported good surface visibility, but it's likely the "slant range visibility" was reduced.
07/29/2021
Thunderstorms across the region the past few days have been summer-like: very tall. Here's a cross section of a storm near Jackson, MS on Wednesday showing a storm top to 60,000 feet. We noticed several others over the past few days (not shown) in the range of 61-63,000 feet.
Tops this tall don't normally last long as slow moving storms go through the growth-decay cycle and collapse. The collapse phase can cause local microbursts.
(image courtesy Gibson Ridge Software, GR2 Analyst)
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