Area Forecast Discussion
Issued by NWS Grand Forks, ND

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FXUS63 KFGF 251753

Area Forecast Discussion
National Weather Service Grand Forks ND
1253 PM CDT Sun Jun 25 2017

Issued at 1250 PM CDT Sun Jun 25 2017

No further changes. Those little showers near GFK have mostly
dissipated. Will still maintain a 20 pop for isold -shra this aftn
GFK/FAR/DTL areas in between the higher chance in LOW/Bemidji


.SHORT TERM...(Today and tonight)
Issued at 335 AM CDT Sun Jun 25 2017

Northwest flow continues across the northern plains with showers
lingering in the east this morning as another wave of precip
advances to the SE from Saskatchewan. Skies have cleared out
between the two systems with low 40s and a couple sites in the
upper 30s this morning. Unfortunately the clear skies will allow
surface heating and cumulus will quickly develop in the cool
airmass today. Convective temps on model soundings are start in
the 50s and only rise to the low 60s by noon. HRRR guidance
suggests a bit of instability develops with some negative LIs in
the Lake of the Woods area and across SE ND ahead of the next wave.
Did add the mention of thunder possible with afternoon showers in
these locations. Otherwise a shower remains possible across the
entire FA today. Activity will quickly diminish this evening with
skies clearing.

.LONG TERM...(Monday through Saturday)
Issued at 335 AM CDT Sun Jun 25 2017

After a cool start on Monday with lows in the 40s from ideal
radiative cooling environment with high pressure to the west and
clear skies, the full sun will allow temps to rise into the 70s
for most locations. Return flow begins with south winds as the SFC
high tracks to the east of the area Monday night. These south
winds will set the stage ahead of a broad area of developing low
pressure as heat and moisture return to the northern plains with
temps in the 80s and dew points in the 60s. By Tuesday afternoon
an axis of 2000 to 3000J/kg of most unstable CAPE will develop
across the central Dakotas with higher bulk shear values across
SD, 40 to 50kts, than the 20 to 30kts expected across ND. SPC did
issue a slight risk to the south of the area and marginal over the
FA for day 3 convective outlook based on this set up. Main
concern will be a convective complex moving into the area with
winds and hail the primary threats in the nighttime hours.

Wednesday to Saturday...The extended period begins with surface
low pressure pushing across the area. The greatest instability
attm will be in Minnesota ahead of the main area of low pressure,
as it is forecast to be in the vicinity of the Red River to start
the period. As the system passes, expect some slight cooling and
breezy conditions, with scattered showers and some thunder
possible. Otherwise, looking for more zonal flow aloft along the
Canadian border in the wake of the system. Impulses traversing the
flow will help increase the chances for showers and storms
through the end of the period. Temperatures behind the system for
the most part will be slightly cooler, then rebounding at the end
of the period as cool high pressure departs.


.AVIATION...(For the 18Z TAFS through 18Z Monday afternoon)
Issued at 1250 PM CDT Sun Jun 25 2017

VFR Cumulus this aftn/early eve in the 4-6k ft range. SCT-BKN
coverage. The Cu will scater and clear tonight most areas with
light winds overnight. Mainly clear Monday morning...though some
VFR CU may form toward midday Monday esp in MN.




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