Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 281504

Area Forecast Discussion
National Weather Service Grand Forks ND
1004 AM CDT Tue Mar 28 2017

Issued at 1004 AM CDT Tue Mar 28 2017

Fog continues to be dense in many spots across the
southwestern/southern CWA, especially in the Fargo/Moorhead area.
Will extend the dense fog advisory until 17Z as short range model
visibilities start to improve by that point and we should have
better mixing from the winds. Will continue to keep highs we have
going in the 40s into the 50s, but may make some adjustments at
the next update for lingering cloud cover.


.SHORT TERM...(Today and tonight)
Issued at 320 AM CDT Tue Mar 28 2017

Dense fog and low clouds continue to be the main forecast
challenges. The area of dense fog is currently along and south of
a line from Maddock to Cooperstown ND to Ada MN, and is slowly
moving southward. Satellite imagery shows there are already
portions of Griggs/Steele/Traill counties that are clearing out,
while the fog is moving into the far southern Red River Valley
south of Wahpeton. So unlike last night, the fog may not be a long
term feature. As far as the clouds go, one clear hole has formed
from Rugby to Lakota to Cooperstown. There also appears to be
less cloud cover east of the Red River Valley. A few showers were
located just north of Grand Forks, but they finally appear to be
shrinking in coverage, so do not plan to mention any showers with
the 4 am forecast issuance. Models today shrink the fog from north
to south and also push it to the west. If this happens there will
be a lot more sun and warming along the Red River Valley and
points to the east, with more uncertainty to the west. Winds still
look to remain pretty weak today into tonight, but for once the
models are not anticipating much fog tonight.

.LONG TERM...(Wednesday through Monday)
Issued at 320 AM CDT Tue Mar 28 2017

The main question for Wednesday through Thursday night will be
whether any light pcpn will affect the far western or northern FA.
Guidance threw in some low pcpn chances for these areas, but if
anything falls it will be minimal. Sfc winds finally look to
increase a little Wednesday into Thursday too. Nothing too
substantial, but probably enough to keep the fog at bay.

The best chance for precipitation of the week looks to arrive on
Friday and linger into the early part of the weekend. Models
continue to depict a deep upper low coming out of the Four Corners
region and propagating across the southern CONUS while a decent
shortwave moves through the northern stream of the continued split
flow pattern, impacting the Northern Plains. Regardless, impacts
should be minimal as precipitation looks to be fairly light and
mostly rain with maybe a little bit of snow mixing in late Friday
night/early Saturday before exiting to the east.

Once the late week system exits, brief upper ridging looks to build
in for the remainder of the weekend. A weak cold front/wind shift
looks to move through the area on Saturday which will briefly keep
high temperatures just a bit cooler than the end of the work week
(upper 40s/low 50s) but will quickly warm back into the mid to upper
50s for Sunday.

Chances then increase for a more active pattern returning to the
area for next week. However, models continue to vary considerably so
not a lot of confidence at this point. Model blend precipitation
chances (mostly slight chance to chance) on and off for the first
half of the work week appear reasonable with above normal
temperatures continuing.


.AVIATION...(For the 12Z TAFS through 12Z Wednesday morning)
Issued at 650 AM CDT Tue Mar 28 2017

KFAR is the only TAF site that still has dense fog and think it
will last there for a few more hours. After the fog is gone, think
there will only be mid level clouds around for the rest of the
TAF period. Winds stay light.


Issued at 320 AM CDT Tue Mar 28 2017

Impacts from snow melt runoff will begin to make its way into the
Grafton and Pembina areas this week. River levels are expected to
continue to quickly rise at Grafton into major levels with an
expected crest between 14.5 and 15.5 feet. Moderate flooding is
expected by the end of the week at Pembina as northern valley
tributaries combine to push the river into the 43 to 45 foot
range late this week.

Streams are beginning to show some response across the Devils Lake
basin and along the Pembina River due to field runoff. Most
culverts remain frozen however they should begin to slowly open
as the temperatures remain above freezing for all but a few hours
in the morning. As a result continued slow rises are expected on
the Pembina River and across the coulees and streams of the Devils
Lake basin.


ND...Dense Fog Advisory until noon CDT today for NDZ038-039-049-052-

MN...Dense Fog Advisory until noon CDT today for MNZ003-029.



LONG TERM...Godon/Lee
HYDROLOGY...JK is the U.S. government's official web portal to all federal, state and local government web resources and services.