Special Weather Statement, NWS Grand Forks, ND

Area Forecast Discussion
National Weather Service Grand Forks ND
623 PM CDT Fri Sep 1 2017

.UPDATE...
Issued at 615 PM CDT Fri Sep 1 2017

Forecast challenge for next couple of hours will be potential for
brief spin-ups along frontal boundary as it moves through the
area. 0-3 KM mean layer cape overlaying sfc vorticity highlighting
well the potential for these spin-ups. Received multiple calls of
rope clouds and a few touchdowns vicinity of Stump Lake prompting
one TOR being issued. Expect storms to be isold in nature but that
threat will continue through mid evening as frontal boundary
pushes through the area.

&&

.SHORT TERM...(This evening through Saturday)
Issued at 317 PM CDT Fri Sep 1 2017

Main cold front/NW Wind shift approaching Langdon and Devils Lake
at 2030 UTC. A band of shower/tstms tried to form ahead of it
west of DVL past noon, but as it moves east it is encountering
less favorable airmass and are pretty weak. Low clouds holding in
the Red River valley ahead of the cold front and preventing much
heating ahead of the front. Thus foresee chance for development
of storms lowering and risk of severe storm while not zero is
lessening.

Will hold onto pops thru the evening mainly east of the Red River.

.LONG TERM...(Saturday night through Friday)
Issued at 317 PM CDT Fri Sep 1 2017

NW wind on Saturday but with sunshine, temperatures will rebound
back into the mid 70s to low 80s. Very warm day on Sunday as winds
turn southwest ahead of a cold front which will enter the northern
RRV late aftn and move south Sunday evening. Some areas of E ND
will see 90. Limited moisture with front itself means a general
dry frontal passage.

Mid level moisture behind the front dropping southeast thru the
area Labor Day will bring clouds and a few showers. Cooler temps
as well.

Tuesday will see a shortwave trof trof exiting northern Minnesota
with lingering showers across northcentral MN through the morning
and a cool northerly near surface wind flow behind a departing cold
front. Surface high pressure steadily marches across the area from
late Tuesday into Wednesday... with north winds turning light and
variable on Wednesday and temperatures starting to recover back into
the 70s. During this period... the H5 ridge axis remains firmly
locked over the western intermountain region with a moderate
northwest H5 flow aloft over the Northern Plains.

For the late week period... the H5 ridge axis starts to lean into
the Northern Plains a bit, with northwest flow weakening and warming
occurring at layers aloft. Late Thursday should see a southerly
return flow near the surface as surface low pressure deepens in the
western dakotas. Overall dry conditions are expected to persist with
temperature arcing near to slightly above seasonal normals for
Thursday and Friday.

&&

.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 615 PM CDT Fri Sep 1 2017

IFR/MVFR cigs across eastern ND and northern MN will clear from
west to east through early Sat morning. Primarily rain showers
will impact BJI area through 02Z while some isolated storms
between DVL and GFK may approach the GFK aerodrome over the next
hour. Saturday expected to be VFR throughout the day with winds
from the NW.

&&

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

UPDATE...Speicher
SHORT TERM...Riddle
LONG TERM...Riddle/Gust
AVIATION...Speicher

Hazardous Weather Outlook
National Weather Service Grand Forks ND
419 AM CDT Fri Sep 1 2017

MNZ001>005-007-008-013>015-029-NDZ006>008-014>016-024-026>030-038-
039-049-052>054-021200-
West Polk-Norman-Clay-Kittson-Roseau-West Marshall-East Marshall-
Pennington-Red Lake-East Polk-Wilkin-Towner-Cavalier-Pembina-
Benson-Ramsey-Eastern Walsh County-Eddy-Nelson-Grand Forks-Griggs-
Steele-Traill-Barnes-Cass-Ransom-Sargent-Richland-
Western Walsh County-
419 AM CDT Fri Sep 1 2017

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

.DAY ONE...Today and Tonight

Isolated severe thunderstorms are possible late this afternoon
into the evening across eastern North Dakota and adjacent portions
of Minnesota. Expected impacts will be hail greater than one inch,
damaging wind gusts up to 60 mph, and possibly a tornado or two.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is possible this afternoon and evening.

MNZ006-009-016-017-022>024-027-028-030>032-040-021200-
Lake Of The Woods-North Beltrami-North Clearwater-South Beltrami-
Mahnomen-South Clearwater-Hubbard-West Becker-East Becker-
West Otter Tail-East Otter Tail-Wadena-Grant-
419 AM CDT Fri Sep 1 2017

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

.DAY ONE...Today and Tonight

Showers along with isolated thunder possible today. A few stronger
storms are possible.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

No hazardous weather is expected at this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
718 PM CDT FRI SEP 01 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0656 PM     HAIL             4 W SHARON              47.60N 97.98W
09/01/2017  E1.50 INCH       GRIGGS             ND   PUBLIC

            OCASSIONAL NICKEL TO PING PONG BALL SIZED HAIL IN VERY
            HEAVY RAIN ACROSS SOUTHEAST LENORA TOWNSHIP.

&&

GGUST

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
724 PM CDT FRI SEP 01 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0538 PM     TORNADO          7 S LAKOTA              47.94N 98.35W
09/01/2017                   NELSON             ND   TRAINED SPOTTER

            A TORNADO TRACKED TO THE EASTWARD OVER MAINLY OPENED
            FIELDS FROM NORTHEAST WAMDUSKA TOWNSHIP INTO NORTHEAST
            CENTRAL TOWNSHIP. MULTIPLE REPORTS AND PHOTOS SHOWED A
            PERSISTENT ROPE TORNADO WITH EPISODIC DUST SWIRLS THROUGH
            AROUND 6PM CDT.

&&

GGUST

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE EASTERN ND/GRAND FORKS ND
733 PM CDT FRI SEP 01 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0715 PM     FUNNEL CLOUD     6 NE COOPERSTOWN        47.51N 98.03W
09/01/2017                   GRIGGS             ND   TRAINED SPOTTER

            BRIEF FUNNEL CLOUD OBSERVED JUST WEST OF THE STEELE
            COUNTY COUNTY LINE IN FAR SOUTHEAST ROMNESS TOWNSHIP.

&&

GGUST

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