Special Weather Statement, NWS Bismarck, ND

Area Forecast Discussion
National Weather Service Bismarck ND
1001 PM CDT Mon Jul 19 2021

.UPDATE...
Issued at 957 PM CDT Mon Jul 19 2021

Thunderstorm activity has tamed down quite a bit, with only a few
little cells floating through eastern parts of our area. With that
said, will keep low chances in through the night as a variety of
weak disturbances moving through the ridge could cause a few
storms to develop. Have also spread areas of smoke through our
whole area as have noticed some lowered visibility reports
peppered through parts of western/central ND. In addition, models
are hinting at some fog possibly developing later over the
northern tier, where surface air is nearly saturated. So, have
spread the patchy fog across the far north.

UPDATE Issued at 708 PM CDT Mon Jul 19 2021

An area of thunderstorms, with one becoming significantly severe,
has developed over north central North Dakota where a plethora of
boundaries are noted. This is in an area of 40kt+ deep layer shear
and strong instability of around 2-3 KJ/Kg. The most significant
storm is now pushing south in southern McHenry County about to
slide into Sheridan and possibly far eastern McLean. This storm
has had a history of producing baseball hail and 70 mph wind
gusts. For the next few hours, expect the severe threat to
continue over north central North Dakota possibly nudging into the
northern James River Valley, with current development off to the
northeast of the significant storm. With that said, CIN expected
to quickly increase as we close into sunset, therefore expect the
severe threat to wane in a couple of hours.

&&

.SHORT TERM...(This evening through Tonight)
Issued at 229 PM CDT Mon Jul 19 2021

Fire weather, heat and thunderstorms (in no particular order) are
the main threats late this afternoon and tonight.

Fire Weather...We continue to hold in the near critical fire
weather conditions range, and unless we see winds really pick-up,
we'll probably leave this as is. Current humidities are generally
around 15 percent in the far southwest, although did see Beach
drop down to 12 percent this hour. Other than the far southwest,
readings are generally 15 to 30 percent. Wind speeds are around 15
knots in the far southwest, but under 10 knots elsewhere. Given
the marginal area, and marginal thresholds will likely ride with
the near critical fire conditions.

Heat Advisory...The Heat Advisory continues through 9 PM CDT. So
far we've seen heat index values to around 103 at Bismarck, with
many stations in the 95 to 100 range as of 230 PM CDT. Maximum
heat indices look to peak around 4-5PM CDT and then drop off
thereafter.

Thunderstorms...A very unstable airmass remains over central into
eastern ND with MLCAPE values of 1500-3500 from north central into
east central ND with little CIN indicated from the EMC RAP on the
SPC mesoanalysis page. However shear remains weak. This would
favor possibly a marginally severe hail or wind event with an
updraft that can survive the cap. Recent convection that developed
near Jamestown was briefly able to sustain an updraft, but as of
300 PM the cell was dissipating. It's possible we could see a few
more cells develop along the southward moving outflow boundary
this afternoon. Whether they can sustain themselves remains to be
seen. If so, a marginally severe wind or hail report can not be
ruled out base in the strong instability.

A baroclinic zone remains along the International Border and later
tonight it's possible we could see a few storms along this
boundary and northward into Canada, but most will remain dry.

.LONG TERM...(Tuesday through Monday)
Issued at 229 PM CDT Mon Jul 19 2021

Hot and dry conditions continue through much of the work week.

A weak cold front moves through the forecast area in the Tue-Wed
timeframe with only slight chances for thunderstorms due to the
strong capping. Temperatures Tuesday through Friday remain in the
90 to 100 degree range across western and central ND, with the
warmest readings west and south central. Humidity values drop a
bit, but we could still be flirting with Heat Advisory criteria.
Most likely it will be a day to day call with marginal Heat
Advisory criteria possible each afternoon. There does look to be
an increase in surface based smoke tonight into Tuesday morning
north of the frontal boundary that's been lingering along the
International Border. We kept a mention of smoke in the forecast
far north central late tonight into Tuesday morning, as well as
some patchy fog.

The best chance of thunderstorms in the next several days looks to
be on Friday as as stronger shortwave impulse tracks across
southern Canada and flattens our upper level ridge. This should
also cool us down a little through the upcoming weekend. At this
time it's looking like mid 80s north to mid 90s south through the
weekend, so not a big drop in temperatures at all, but some
relief. After the chance of thunderstorms Friday, the rest of the
weekend looks mostly dry at this time, with indications of
possibly warming up again early next week.

&&

.AVIATION...(For the 00Z TAFS through 00Z Tuesday evening)
Issued at 708 PM CDT Mon Jul 19 2021

Ongoing strong/severe thunderstorms over north central North
Dakota will continue to settle southerly this evening, but at this
time do not expect them to hit any of the TAF sites. With that
said, additional development is possible, but will withhold from
mentioning in any TAFs as confidence is quite low whether they
would be affected. Otherwise, VFR conditions are expected.

&&

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

UPDATE...JJS
SHORT TERM...TWH
LONG TERM...TWH
AVIATION...JJS

Hazardous Weather Outlook
National Weather Service Bismarck ND
953 PM CDT Mon Jul 19 2021

NDZ001>005-009>013-017>023-025-033>037-046>048-050-051-210300-
Divide-Burke-Renville-Bottineau-Rolette-Williams-Mountrail-Ward-
McHenry-Pierce-McKenzie-Dunn-Mercer-Oliver-McLean-Sheridan-Wells-
Foster-Stark-Morton-Burleigh-Kidder-Stutsman-Emmons-Logan-
La Moure-McIntosh-Dickey-
953 PM CDT Mon Jul 19 2021 /853 PM MDT Mon Jul 19 2021/

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

.DAY ONE...Tonight

There is a chance for thunderstorms tonight. Severe weather is not
expected.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Near critical fire weather conditions are likely for areas along
and to the west and south of the Missouri River on Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

NDZ031-032-040>045-210300-
Golden Valley-Billings-Slope-Hettinger-Grant-Bowman-Adams-Sioux-
953 PM CDT Mon Jul 19 2021 /853 PM MDT Mon Jul 19 2021/

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

.DAY ONE...Tonight

The probability for widespread hazardous weather is low.

.DAYS TWO THROUGH SEVEN...Tuesday through Sunday

Near critical fire weather conditions are likely for areas along
and to the west and south of the Missouri River on Tuesday.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not expected.

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
816 PM CDT MON JUL 19 2021

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

0715 PM     TSTM WND GST     1 S BALFOUR             47.93N 100.53W
07/19/2021  E65 MPH          MCHENRY            ND   PUBLIC

            PUBLIC REPORT OF THUNDERSTORM WIND GUSTS
            AROUND 60-65 MPH ALONG WITH HAIL NOT QUITE
            GOLF BALL SIZE. GARDEN IS RUINED.

&&

BG

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
824 PM CDT MON JUL 19 2021

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

0630 PM     TSTM WND DMG     5 NW GEORGE LAKE        48.15N 100.47W
07/19/2021                   MCHENRY            ND   TRAINED SPOTTER

            70 MPH WIND GUSTS AND PING PONG BALL SIZE
            HAIL CAUSED A VARIETY OF DAMAGE. WINDOW
            SCREENS WERE SHREDDED, SOME WINDOWS WERE
            BROKEN, SIDING WAS DAMAGED ON HOUSE AND
            CAMPER. IN ADDITION, NEARBY POTATO FIELD WAS
            SHREDDED, AND CORN WAS ABOUT 50 PERCENT
            DAMAGED. 1.70 INCHES OF RAIN ALSO FELL.

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
825 PM CDT MON JUL 19 2021

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

0824 PM     HEAVY RAIN       5 NW GEORGE LAKE        48.15N 100.47W
07/19/2021  M1.70 INCH       MCHENRY            ND   TRAINED SPOTTER

&&

Special Weather Statement
National Weather Service Bismarck ND
846 PM CDT Mon Jul 19 2021

NDZ013-200215-
Pierce ND-
846 PM CDT Mon Jul 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL PIERCE COUNTY UNTIL 915
PM CDT...

At 846 PM CDT, a strong thunderstorm was located over Balta, or 11
miles south of Rugby, moving south at 15 mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Balta and Silva.

LAT...LON 4828 9993 4819 9985 4802 9985 4802 10010
      4825 10010
TIME...MOT...LOC 0146Z 344DEG 12KT 4820 10002

EDWARDS

PRELIMINARY LOCAL STORM REPORT...SUMMARY
NATIONAL WEATHER SERVICE BISMARCK ND
937 PM CDT MON JUL 19 2021

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

0545 PM     HAIL             10 S BERWICK            48.22N 100.25W
07/19/2021  M2.00 INCH       MCHENRY            ND   PUBLIC

            RELAYED BY BROADCAST MEDIA. TIME ESTIMATED
            FROM RADAR.

0622 PM     TSTM WND GST     4 NNW GEORGE LAKE       48.16N 100.40W
07/19/2021  E60 MPH          MCHENRY            ND   PUBLIC

0630 PM     TSTM WND DMG     5 NW GEORGE LAKE        48.15N 100.47W
07/19/2021                   MCHENRY            ND   TRAINED SPOTTER

            70 MPH WIND GUSTS AND PING PONG BALL SIZE
            HAIL CAUSED A VARIETY OF DAMAGE. WINDOW
            SCREENS WERE SHREDDED, SOME WINDOWS WERE
            BROKEN, SIDING WAS DAMAGED ON HOUSE AND
            CAMPER. IN ADDITION, NEARBY POTATO FIELD WAS
            SHREDDED, AND CORN WAS ABOUT 50 PERCENT
            DAMAGED. 1.70 INCHES OF RAIN ALSO FELL.

0630 PM     HAIL             7 NE KARLSRUHE          48.16N 100.51W
07/19/2021  E1.75 INCH       MCHENRY            ND   PUBLIC

            RELAYED BY BROADCAST MEDIA PARTNER. MOST
            HAIL WAS SMALLER, BUT WERE A FEW GOLF BALLS.

0630 PM     TSTM WND DMG     7 NE KARLSRUHE          48.16N 100.51W
07/19/2021                   MCHENRY            ND   PUBLIC

            COTTONWOOD TREES BLOWN OVER. SAME INDIVIDUAL
            REPORTED THE GROUND WAS WHITE WITH HAIL 4
            MILES EAST OF KARLSRUHE, AND ALL HIS HAY
            THERE WAS BLOWN WAY. REPORT WAS RELAYED TO
            THE NWS BY A BROADCAST MEDIA PARTNER.

0635 PM     TSTM WND GST     5 NW GEORGE LAKE        48.15N 100.47W
07/19/2021  E70 MPH          MCHENRY            ND   TRAINED SPOTTER

0635 PM     HAIL             5 NW GEORGE LAKE        48.15N 100.47W
07/19/2021  E1.50 INCH       MCHENRY            ND   TRAINED SPOTTER

0707 PM     HAIL             4 E KARLSRUHE           48.09N 100.53W
07/19/2021  E2.75 INCH       MCHENRY            ND   PUBLIC

            MOST OF THE HAIL WAS SMALL MIXED WITH SOME
            GOLF BALL SIZE AND A FEW BASEBALL SIZE
            HAILSTONES. RELAYED TO NWS BY BROADCAST
            MEDIA PARTNER.

0710 PM     HAIL             2 SSE BALFOUR           47.93N 100.53W
07/19/2021  E1.00 INCH       MCHENRY            ND   PUBLIC

            CORRECTS PREVIOUS HAIL REPORT FROM 1 S
            BALFOUR. DRIFTS OF DIME SIZE HAIL BUT A FEW
            QUARTERS WERE NOTED. WAS COMBINED WITH 60
            MPH WIND GUSTS. GARDEN WAS FLATTENED.

0710 PM     TSTM WND GST     2 SSE BALFOUR           47.93N 100.52W
07/19/2021  E60 MPH          MCHENRY            ND   PUBLIC

            DRIFTS OF DIME SIZE HAIL BUT A FEW QUARTERS
            WERE NOTED. WAS COMBINED WITH 60 MPH WIND
            GUSTS. GARDEN WAS FLATTENED.

0715 PM     TSTM WND GST     1 S BALFOUR             47.93N 100.53W
07/19/2021  E65 MPH          MCHENRY            ND   PUBLIC

            PUBLIC REPORT OF THUNDERSTORM WIND GUSTS
            AROUND 60-65 MPH ALONG WITH HAIL NOT QUITE
            GOLF BALL SIZE. GARDEN IS RUINED.

0715 PM     HAIL             1 S BALFOUR             47.93N 100.53W
07/19/2021  E1.50 INCH       MCHENRY            ND   PUBLIC

            PUBLIC REPORT OF HAIL NOT QUITE GOLF BALL
            SIZE, ALONG WITH 60-65 MPH WINDS. GARDEN IS
            RUINED.

0720 PM     TSTM WND GST     2 NNW KIEF              47.89N 100.53W
07/19/2021  E60 MPH          MCHENRY            ND   PUBLIC

            COMBINED WITH PEA SIZE HAIL.

&&

Special Weather Statement
National Weather Service Bismarck ND
1129 PM CDT Mon Jul 19 2021

NDZ005-200500-
Rolette ND-
1129 PM CDT Mon Jul 19 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN ROLETTE COUNTY UNTIL
MIDNIGHT CDT...

At 1128 PM CDT, strong thunderstorms were located along a line
extending from International Peace Garden to near Belcourt to near
Rolla. Movement was southeast at 20 mph.

Half inch hail and wind gusts to 40 mph will be possible with these
storms.

Locations impacted include...
Rolla, St. John, International Peace Garden, Belcourt, Shell Valley,
and Thorne.

Campers should move to a sturdy shelter until these storms pass.

&&

LAT...LON 4872 9952 4872 9998 4900 10014 4900 9953
TIME...MOT...LOC 0428Z 328DEG 15KT 4897 10008 4884 9982 4888 9955

HOLLAN