Area Forecast Discussion
Issued by NWS Bismarck, ND

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FXUS63 KBIS 261145
AFDBIS

Area Forecast Discussion
National Weather Service Bismarck ND
645 AM CDT Sun Mar 26 2017

.UPDATE...
Issued at 643 AM CDT Sun Mar 26 2017

After coordination with FGF, updated to issue a Dense Fog
Advisory for parts of the James River Valley. Surface observations
and local webcams show very low visibilities due to fog across
that area. We also made small adjustments to pops to account for
the latest radar trends. Short term models still support a
diminishing precipitation trend through the morning.

&&

.SHORT TERM...(Today and tonight)
Issued at 305 AM CDT Sun Mar 26 2017

The main problems in the short term period surround light
precipitation chances today along with clouds and temperatures.

Early morning radar mosaic shows most returns stretching from
southwest North Dakota, though the central part of the state. Have
not seen very many locations report precipitation accumulations
with very dry air in the mid and low levels of the atmosphere
keeping much of the precipitation aloft in the form of virga.
Short term models (HRRR, RAP) suggests the main band of
precipitation / radar returns should diminish this morning and
eventually shrink south into South Dakota. Will continue to carry
mainly chance pops for light rain this morning.

Satellite imagery this morning shows quite a bit of mid and high
level clouds which are helping mask the north and west extent of
the stratus/fog. Observations show the stratus has made it into
Jamestown, and the HRRR would suggest it will spread north and
west a bit more before its progress is halted. Will generally
follow the HRRR and SREF`s idea which keeps the stratus in place
much of the morning across the James River Valley before gradually
eroding it from west to east. This could have some impact on
temperatures, so opted to bring highs a little closer to the more
conservative guidance where the stratus may linger.

.LONG TERM...(Monday through Saturday)
Issued at 305 AM CDT Sun Mar 26 2017

The longer term period will feature a progressive H5 flow with
periodic chances for light precipitation. The GFS and ECMWF
suggest the next best chance of light precipitation will come
Tuesday night into Wednesday, though the NAM keeps the chances
south of North Dakota. Temperatures through the period should
generally be a little above normal with highs in the 40s and 50s
and lows in the 30s.

&&

.AVIATION...(For the 12Z TAFS through 12Z Monday morning)
Issued at 643 AM CDT Sun Mar 26 2017

IFR cigs and vis will slowly improve at KJMS this morning. There
could also be patchy fog or even a brief period of light rain
this morning at KBIS. Generally went VFR at the other TAF sites.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
Dense Fog Advisory until 10 AM CDT this morning for NDZ025-037-
047-048-050-051.

&&

$$

UPDATE...CK
SHORT TERM...CK
LONG TERM...CK
AVIATION...CK



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