Special Weather Statement, NWS Grand Forks, ND

Area Forecast Discussion
National Weather Service Grand Forks ND
401 AM CDT Mon Aug 5 2019

.SHORT TERM...(Today and tonight)
Issued at 400 AM CDT Mon Aug 5 2019

Stalled frontal zone slowly moves south as cold front this morning,
while shortwave trough upstream digging into northwest ND early this
morning moves across our CWA through midday.

Large cluster of showers/storms (MCS) along frontal zone will
continue to drift south and southeast towards better instability
axis and has shown tendency towards being more elevated in nature,
but ahead of frontal zone new updrafts still have upwards of 3000
J/KG MUCAPE to aid redevelopment through this morning. Deep layer
effective shear is impressive (though linear) with values in the
35-50kt range. This instability axis will continue to shift south
and southeast ahead of front and this activity should eventually
move out of our area between 12-15Z this morning with an eventual
weakening trend. Due to elevated nature hail/wind continue to be
favored severe modes. High PWAT and tendency for training along
frontal zone does raise concern for localized flooding especially
in the southern Red River Valley that has had much more precip
over the last 30 days than northern locations.

This afternoon-Tonight: Dry conditions and slightly cooler
temperatures should arrive as post frontal/stable air mass settles
into our CWA. NW flow and increased mixing may allow breezing
conditions to develop with gusts around 25 mph this afternoon. Highs
today will be near seasonal values in the low 80s (a few mid 80s
still possible depending on clearing).

.LONG TERM...(Tuesday through Monday)
Issued at 400 AM CDT Mon Aug 5 2019

Tuesday-Tuesday night: Guidance shows quick recovery ahead of
another shortwave trough moving through southern Canada just
northeast of our CWA. While upper level forcing is less organized we
do see recovery with WAA and models indicated increasing
instability supportive of diurnal shower/thunderstorm development
(maybe even strong/marginally severe). Better deep layer shear lags
behind shortwave further north and east, but there will be
increasing mid level vorticity, so while severe risk isn't high it
can't be ruled out.

Wednesday-Monday: The majority of these periods are highlighted
by dominant northwest flow pattern and after a stronger cold
frontal passage Tuesday night below normal temperatures are
expected at least through Tuesday. Precip chances uncertain due to
progressive pattern and weaker wave passages near our CWA. Ridge
breaks down by this weekend with flow becoming more westerly and
eventually allows a stronger upper trough passage by Sunday or
Monday (variance in model timing). There would be a much
better/organized period of forcing with the advertised
trough/upper low early next week, and potential for increasing
precip and severe chances so it's worth monitoring for impacts.

&&

.AVIATION...(For the 06Z TAFS through 06Z Monday night)
Issued at 1147 PM CDT Sun Aug 4 2019

Timing from the previous set of TAFs worked out pretty well. Just
stuck in some TEMPO groups for the hours when the best chances for
storms is expected. Think most of the activity should be done by
sometime early to mid Monday morning.

&&

.FGF WATCHES/WARNINGS/ADVISORIES...
ND...None.
MN...None.
&&

SHORT TERM...DJR
LONG TERM...DJR
AVIATION...Godon

Hazardous Weather Outlook
National Weather Service Grand Forks ND
514 PM CDT Sun Aug 4 2019

MNZ001>009-013>017-022>024-027>032-040-NDZ006>008-014>016-024-
026>030-038-039-049-052>054-052215-
West Polk-Norman-Clay-Kittson-Roseau-Lake Of The Woods-
West Marshall-East Marshall-North Beltrami-Pennington-Red Lake-
East Polk-North Clearwater-South Beltrami-Mahnomen-
South Clearwater-Hubbard-West Becker-East Becker-Wilkin-
West Otter Tail-East Otter Tail-Wadena-Grant-Towner-Cavalier-
Pembina-Benson-Ramsey-Eastern Walsh County-Eddy-Nelson-
Grand Forks-Griggs-Steele-Traill-Barnes-Cass-Ransom-Sargent-
Richland-Western Walsh County-
514 PM CDT Sun Aug 4 2019

This hazardous weather outlook is for portions of eastern North
Dakota, west central and northwest Minnesota.

.DAY ONE...Tonight

Scattered severe thunderstorms are possible this evening, with
hail up to 2 inches in diameter and damaging wind gusts to 75 mph
being the main hazards.

.DAYS TWO THROUGH SEVEN...Monday through Saturday

Isolated thunderstorms may develop Tuesday afternoon and evening.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be required this evening.

Special Weather Statement
National Weather Service Grand Forks ND
320 AM CDT Mon Aug 5 2019

NDZ029-030-050900-
Steele ND-Traill ND-
320 AM CDT Mon Aug 5 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHWESTERN TRAILL AND SOUTHERN
STEELE COUNTIES UNTIL 400 AM CDT...

At 320 AM CDT, Doppler radar was tracking a strong thunderstorm near
Hope, or 35 miles northeast of Valley City, moving east at 35 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Mayville, Hillsboro, Portland, Hope, Blanchard, Clifford and Blabon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.

&&

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
southeastern North Dakota.

LAT...LON 4749 9791 4751 9706 4724 9695 4724 9709
      4735 9799
TIME...MOT...LOC 0820Z 271DEG 31KT 4739 9767

CJ

Special Weather Statement
National Weather Service Grand Forks ND
327 AM CDT Mon Aug 5 2019

NDZ028-029-038-050915-
Griggs ND-Steele ND-Barnes ND-
327 AM CDT Mon Aug 5 2019

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHERN GRIGGS...NORTHWESTERN
BARNES AND SOUTHWESTERN STEELE COUNTIES UNTIL 415 AM CDT...

At 327 AM CDT, Doppler radar was tracking a strong thunderstorm near
Courtenay, or 32 miles northwest of Valley City, moving east at 25
mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Wimbledon, Dazey, Rogers, Luverne, Sibley, Leal and Walum.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential 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 a safe
shelter inside a building or vehicle.

&&

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
southeastern North Dakota.

LAT...LON 4725 9847 4727 9846 4729 9787 4695 9789
      4704 9847
TIME...MOT...LOC 0827Z 272DEG 24KT 4718 9859

CJ

Special Weather Statement
National Weather Service Grand Forks ND
347 AM CDT Mon Aug 5 2019

MNZ002-003-027-NDZ039-050930-
West Becker MN-Clay MN-Norman MN-Cass ND-
347 AM CDT Mon Aug 5 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN CLAY...SOUTHERN
NORMAN...WESTERN BECKER AND NORTHEASTERN CASS COUNTIES UNTIL 430 AM
CDT...

At 347 AM CDT, Doppler radar was tracking a strong thunderstorm over
Perley, or 19 miles north of Fargo, moving east at 30 mph.

Nickel size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Ulen, Felton, Georgetown, Borup, Perley, Syre and Twin Valley.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.

&&

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
northwestern Minnesota...and southeastern North Dakota.

LAT...LON 4705 9685 4721 9693 4732 9632 4706 9607
TIME...MOT...LOC 0847Z 260DEG 27KT 4715 9677

CJ

Special Weather Statement
National Weather Service Grand Forks ND
349 AM CDT Mon Aug 5 2019

MNZ015>017-050945-
East Polk MN-North Clearwater MN-South Beltrami MN-
349 AM CDT Mon Aug 5 2019

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL POLK...SOUTH CENTRAL
BELTRAMI AND NORTHERN CLEARWATER COUNTIES UNTIL 445 AM CDT...

At 349 AM CDT, Doppler radar was tracking a strong thunderstorm over
Gonvick, or 34 miles northwest of Bemidji, moving east at 30 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Clearbrook, Gonvick, Gully, Puposky, Berner, Island Lake in Beltrami
County and Debs.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.

&&

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
northwestern Minnesota.

LAT...LON 4771 9568 4784 9566 4784 9488 4761 9491
TIME...MOT...LOC 0849Z 260DEG 26KT 4777 9550

CJ

Special Weather Statement
National Weather Service Grand Forks ND
351 AM CDT Mon Aug 5 2019

NDZ029-030-038-039-050930-
Steele ND-Traill ND-Barnes ND-Cass ND-
351 AM CDT Mon Aug 5 2019

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN CASS...SOUTHWESTERN
TRAILL...NORTHEASTERN BARNES AND SOUTHEASTERN STEELE COUNTIES UNTIL
430 AM CDT...

At 351 AM CDT, Doppler radar was tracking a strong thunderstorm over
Page, or 23 miles northeast of Valley City, moving east at 30 mph.

Penny size hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Arthur, Hunter, Page, Galesburg, Amenia, Erie and Absaraka.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.

&&

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
southeastern North Dakota.

LAT...LON 4701 9780 4725 9783 4729 9709 4694 9712
TIME...MOT...LOC 0851Z 271DEG 26KT 4714 9761

CJ

Special Weather Statement
National Weather Service Grand Forks ND
418 AM CDT Mon Aug 5 2019

NDZ038-039-049-053-051000-
Richland ND-Ransom ND-Barnes ND-Cass ND-
418 AM CDT Mon Aug 5 2019

...SIGNIFICANT WEATHER ADVISORY FOR RANSOM...SOUTHWESTERN CASS...
BARNES AND NORTHWESTERN RICHLAND COUNTIES UNTIL 500 AM CDT...

At 417 AM CDT, Doppler radar was tracking a strong thunderstorm over
Lucca, or 19 miles southeast of Valley City, moving southeast at 45
mph.

Penny size hail and wind gusts up to 50 mph will be possible with
this storm.

Locations impacted include...
Valley City, Lisbon, Enderlin, Kindred, Tower City, Davenport and
Leonard.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
office in Grand Forks.

&&

A Severe Thunderstorm Watch remains in effect until 700 AM CDT for
southeastern North Dakota.

LAT...LON 4663 9803 4663 9844 4698 9844 4698 9847
      4700 9847 4704 9758 4663 9680 4636 9762
      4631 9803
TIME...MOT...LOC 0917Z 311DEG 41KT 4670 9775

CJ