Special Weather Statement, NWS Bismarck, ND

Area Forecast Discussion
National Weather Service Bismarck ND
415 PM CDT Sat Jul 3 2021

.UPDATE...
Issued at 415 PM CDT Sat Jul 3 2021

Ran a quick update to better align pops with current radar trends.
A few thunderstorms have developed across southwest North Dakota
with a few echoes now also showing up across parts of Sioux
County. The latest Hi-Res models continue to have varying
solutions in regards to convective development this evening, but
the HRRR lends support for more storms generally in south central
parts of the state towards the James River Valley. The potential
for a strong to severe storm still looks on track with the latest
mesoanalysis showing an environment of MLCAPE values in the
1500-2500 j/kg range, though shear remains fairly weak at 20 to
30 kts.

&&

.SHORT TERM...(This afternoon through Sunday)
Issued at 244 PM CDT Sat Jul 3 2021

Hot temperatures and thunderstorm potential this afternoon and
evening highlight the short term forecast period.

At the mid to upper levels, a compact shortwave/trough was located
over central North Dakota and continues to move east. A remnant
MCV also continue to rotate towards the Devil's Lake Basin. This
feature along with any remnant outflow from morning storms will
serve as focus for more thunderstorm development this afternoon
and into this evening.

The best chance for some strong to severe storms will generally
be from the eastern Turtle Mountains and south into the James
River Valley. Here, plenty of buoyancy will be available with
MLCAPE values ranging from 1500 to 2500 J/kg, however shear will
be fairly weak in the 20 to 30 knot range. This will support the
potential for some strong to severe storms capable of producing
large hail up to the size of quarters and wind gusts to 60 mph. A
conditional weak tornado/landspout threat may also exist here
with plenty of background vorticity present along the remnant MCV,
but the lack of better moisture and borderline LCLs may keep this
threat minimal at best.

Further west, a warm front will also move east and may provide
enough lift for more thunderstorm development across portions of
the west and central, but coverage will be limited as weak
transient ridging/height rises try to nudge in. Parameters here
will also be less favorable for severe storms. A cold front then
approaches from the northwest late this afternoon and into the
evening, crossing the state overnight. This afternoon, ahead of
the cold front, breezy southerly winds are likely across the
central and east.

The heat will be the other main story today as a couple of sites
have already hit 100 and numerous sites across western and
central North Dakota are already in the mid to upper 90s.

For your Independence Day, broad ridging and high pressure will
lead to a mostly sunny sky with temperatures not quite as hot as
today with highs generally expected from the upper 80s to upper
90s. Expect breezy winds again across portions of the central and
into the James River Valley, but this time out of the northwest
behind the cold front.

.LONG TERM...(Sunday night through Saturday)
Issued at 244 PM CDT Sat Jul 3 2021

Ridging starts to deamplify again Sunday night as a northern
stream shortwave tries to flatten it. This will lead to increasing
cloud cover and precipitation chances overnight through Tuesday.
Widespread showers are likely with chances of thunderstorms.
However, buoyancy will be fairly limited so severe weather is not
really a concern. While precipitation will be widespread, it will
still be convective/hit or miss in nature but many will see
beneficial rainfall.

A brief cool down continues through Tuesday when highs will range
from the mid 60s across the Turtle Mountains, to the lower 80s
across the far southwest. Ridging builds in again on Wednesday,
warming back into the mid 70s to mid 80s. Thunderstorm chances
return Wednesday night through Friday as a potent shortwave
trough approaches. Details remain uncertain regarding amplitude
and timing as global models continue to flip flop. Over the past
few runs the deterministic ECMWF had started coming in more
amplified/stronger and the GFS had backed off. However, today's 12z
deterministic GFS is now the stronger solution with the ECMWF
backing off a bit. Taking a closer look at the ensembles, it is
evident that we are still a few days away from getting a clear
picture of how this system will unfold. However, CIPS analogs and
pattern recognition would suggest the potential for at least some
severe weather mid to late week, so we will keep an eye on the
ensemble trends over the coming days.

&&

.AVIATION...(For the 18Z TAFS through 18Z Sunday afternoon)
Issued at 1231 PM CDT Sat Jul 3 2021

VFR conditions are expected through the period. Breezy winds will
develop across portions of the central and east out of the south,
shifting to the southwest later this afternoon and eventually
west. Winds will shift to out of the northwest by tomorrow
morning. A few strong to severe thunderstorms will be possible
from the eastern Turtle Mountains south to the James River Valley
late this afternoon and evening with hail up to the size of
quarters and wind gusts to 60 mph. Across the central, isolated
non-severe storms will be possible this afternoon and evening.

&&

.BIS WATCHES/WARNINGS/ADVISORIES...
NONE.
&&

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

Hazardous Weather Outlook
National Weather Service Bismarck ND
406 PM CDT Sat Jul 3 2021

NDZ001>003-009>011-017>021-031>033-040-041-043-044-042115-
Divide-Burke-Renville-Williams-Mountrail-Ward-McKenzie-Dunn-
Mercer-Oliver-McLean-Golden Valley-Billings-Stark-Slope-Hettinger-
Bowman-Adams-
406 PM CDT Sat Jul 3 2021 /306 PM MDT Sat Jul 3 2021/

This Hazardous Weather Outlook is for portions of north central
North Dakota, northwest North Dakota, south central North Dakota,
and southwest North Dakota.

.DAY ONE...Tonight

Isolated thunderstorms are possible across portions of western and
central North Dakota into the early evening. Severe weather is
not anticipated at this time.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

NDZ004-005-012-013-022-023-025-034>037-042-045>048-050-051-042115-
Bottineau-Rolette-McHenry-Pierce-Sheridan-Wells-Foster-Morton-
Burleigh-Kidder-Stutsman-Grant-Sioux-Emmons-Logan-La Moure-
McIntosh-Dickey-
406 PM CDT Sat Jul 3 2021 /306 PM MDT Sat Jul 3 2021/

This Hazardous Weather Outlook is for portions of north central
North Dakota, south central North Dakota, and southeast North
Dakota.

.DAY ONE...Tonight

Isolated severe thunderstorms are possible into the evening. The
main hazards will be large hail up to quarter size and damaging
wind gusts up to 60 mph.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

The probability for widespread hazardous weather is low.

.SPOTTER INFORMATION STATEMENT...

Weather spotters may be needed on a limited basis.

Special Weather Statement
National Weather Service Bismarck ND
421 PM CDT Sat Jul 3 2021

NDZ005-013-032145-
Rolette ND-Pierce ND-
421 PM CDT Sat Jul 3 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PIERCE AND
SOUTHEASTERN ROLETTE COUNTIES UNTIL 445 PM CDT...

At 421 PM CDT, a strong thunderstorm was located near Wolford, or 19
miles northeast of Rugby, moving northeast at 30 mph.

Nickel size hail and wind gusts to 55 mph will be possible with this
storm.

Locations impacted include...
Wolford, Mylo, Agate and Nanson.

Very heavy rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek shelter
inside a building or vehicle.

&&

LAT...LON 4873 9953 4872 9949 4837 9949 4837 9961
      4849 9992 4880 9953
TIME...MOT...LOC 2121Z 218DEG 24KT 4851 9962

ANGLIN

Special Weather Statement
National Weather Service Bismarck ND
445 PM CDT Sat Jul 3 2021

NDZ005-013-032215-
Rolette ND-Pierce ND-
445 PM CDT Sat Jul 3 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN PIERCE AND
SOUTHEASTERN ROLETTE COUNTIES UNTIL 515 PM CDT...

At 445 PM CDT, a strong thunderstorm was located over Wolford, or 18
miles northeast of Rugby, moving east at 15 mph.

Nickel size hail and wind gusts to 55 mph will be possible with this
storm.

Locations impacted include...
Wolford, Mylo, Agate and Nanson.

Very heavy rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek shelter
inside a building or vehicle.

&&

LAT...LON 4872 9952 4872 9949 4837 9949 4837 9961
      4843 9977 4858 9978 4874 9953
TIME...MOT...LOC 2145Z 261DEG 12KT 4851 9964

ANGLIN