Area Forecast Discussion
Issued by NWS New Orleans/Baton Rouge, LA

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FXUS64 KLIX 190107

Area Forecast Discussion
National Weather Service New Orleans LA
707 PM CST Sun Feb 18 2018

The sounding this evening is still very warm through low levels.
PW is at 1.2 inches. Winds are southerly near the surface then
become more southwesterly aloft. There is an elevated inversion
near 700 mb. Only patchy fog is expected again later tonight thanks
in part to a well mixed boundary layer and nearshore waters that
are becoming warmer than several days ago.



.PREV DISCUSSION... /issued 355 PM CST Sun Feb 18 2018/

Warm temperatures will continue to be the rule across the area
thanks to a pretty pronounced high pressure over the Atlantic.
This ridge should keep us fairly dry from frontal boundaries for
the next few days. Onshore flow around the high will keep moisture
in the atmosphere and a few stray convective showers cannot be
ruled out any day this week. Guidance still points at a period of
wet weather for a large part of the country by mid week and into
the weekend. A front will approach and stall across the mid south.
This will bring a large area of the south some heavy rain. The
high over the Atlantic should keep our area out of the heaviest
rainfall, but the placement and the ultimate position of the
frontal boundary will still need some tweaking over the next few
days. There is a possibility that a few thunderstorms could
occur in our area on Tuesday but the best instability begins to
arrive Wednesday. These thunderstorms will be capable of producing
some heavy rainfall. Wednesday looks to also be the start of a
lengthy duration of heavy rainfall along the new frontal boundary
that will develop from Texas to Oklahoma/Arkansas and Missouri.
Again, daily rainfall chances will be elevated in the forecast
due to the uncertainty of the placement of the stalled front.
Overall expect springlike conditions to prevail through the week
thanks to that Atlantic ridge.

Low clouds finally scattered out this afternoon between
18-20z Expect low clouds to redevelop tonight over much of the area
likely dropping down into MVFR and IFR status. As for vsbys again
the greatest impacts should be closer to the coast. GPT and possibly
ASD will have the greatest impacts with vsbys falling to IFR and
possibly as low as LIFR but again the greatest issue for all
terminals looks like low cigs. /CAB/

Holding off on a dense fog advisory for now but need to
watch closely. The waters are still relatively cool compared to the
warm moist air abv it and fog may initially develop this evening
but as winds increase overnight the fog looks like it will push
inland some and lift becoming mostly low clouds. Will continue to
show fog in the grids and zones. Return flow will really begin to
take hold of the waters tonight and persist through the week.

DSS code: Green.
Deployed: None.
Activation: None.
Activities: None.

Decision Support Services (DSS) Code Legend
Green  = No weather impacts that require action.
Blue   = Long-fused watch, warning, or advisory in effect or
         high visibility event.
Yellow = Heightened impacts with short-fused watch, warning or
         advisory issuances; radar support.
Orange = High Impacts; Slight to Moderate risk severe; nearby tropical
         events; HazMat or other large episodes.
Red    = Full engagement for Moderate risk of severe and/or
         direct tropical threats; Events of National Significance.


MCB  61  82  65  80 /  10  20  20  30
BTR  62  82  66  81 /  10  20  20  30
ASD  63  81  66  81 /  10  20  20  30
MSY  64  82  66  82 /  10  20  20  30
GPT  62  79  64  79 /  10  20  20  30
PQL  61  79  64  80 /  10  20  20  30



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