Area Forecast Discussion
Issued by NWS Grand Forks, ND

Home | Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50

FXUS63 KFGF 232358

Area Forecast Discussion
National Weather Service Grand Forks ND
658 PM CDT THU JUN 23 2016

Issued at 655 PM CDT Thu Jun 23 2016

Mainly clear sky expected this evening into the overnight. some
mid or high level scattered cloud cover psbl late tonight in warm
advection zone in dvl region into northeastern South Dakota. A few
short term models want to develop some high based showers in this
warm advection zone in far northestern South Dakota after 09z.
Something to watch.


.SHORT TERM...(This evening through Friday)
Issued at 320 PM CDT Thu Jun 23 2016

Surface ridge axis to shift east allowing return flow and warm
advection to initiate from west to east overnight. Coolest
readings over the far east however overall minimum temperatures
will be closer to seasonal averages.

On friday surface low pressure will organize and shift into the
western dakotas during the afternoon. East west oriented warm
frontal boundary will lift north to the northern fa by evening.
Capping will increase during the day with lowest CIN north of warm
front vcnty international border. This looks to be the most likely
area for convective initiation late afternoon. Instability axis
initially across the central dakotas will shift east in the
afternoon. Maintained some low pops across the western fa however
with strong capping confidence not real high. Expanded pops
eastward across the north late afternoon but this also dependent
on when cap breaks. Temperatures will recover to at or above
average with continued warm advection/mixing during the day.

.LONG TERM...(Friday night through Thursday)
Issued at 320 PM CDT Thu Jun 23 2016

Friday night through Saturday night...Potentially active period
begins with a warm front lifting north across the northern portions
of the FA. Strong capping remains a major question mark in terms of
where, if and when storms occur Friday evening. If the cap is broken
supercells will be the dominate convective mode with large hail and
a few tornadoes as storms interact with the warm front. Once storms
lift north into Canada there will be a lull in activity before the
western forecast area sees a line of storms advancing eastward along
the westerly wind shift early Saturday morning. Main threats will be
damaging winds and large hail. Timing of the wind shift and its
eastward progression will show what area will see the threat of
severe weather redevelop Saturday late morning into the
afternoon...current thinking is along the eastern edge of the Red
River valley and points east...per SPC Day 2 convective outlook.

Sunday to Thursday a relatively calmer period appears to be setting
up across the northern plains. After the upper low departs with its
lingering showers Sunday the 500mb flow aloft will keep moderate and
extreme instability to the south and west of the forecast area and
with it a quieter weather regime is in store for the FA.
Temperatures will be predominantly in the 70s with a gradual warming
trend through the week and some low 80s by thursday. Only POPs
during the work week will be Wednesday night into Thursday.


.AVIATION...(For the 00Z TAFS through 00Z Friday evening)
Issued at 655 PM CDT Thu Jun 23 2016

VFR is the forecast thru the pd. A light south to southeast wind
tonight increasing to 15 to 25 kts in the RRV and DVL basin Friday
midday and aftn. Increasing in some cirrus or mid clouds Friday.
Main issues are late in the TAF pd in regards to thunderstorm
chances. Too low to mention in any one TAF site, but in general
highest risk is DVL, GFK and TVF.


.FGF Watches/Warnings/Advisories...


SHORT TERM...Voelker
AVIATION...Riddle is the U.S. government's official web portal to all federal, state and local government web resources and services.