Severe Thunderstorm Warning 91, NWS Bismarck, ND

Area Forecast Discussion
National Weather Service Bismarck ND
558 PM CDT Fri Jul 12 2019

.UPDATE...
Issued at 457 PM CDT Fri Jul 12 2019

Thunderstorms ongoing in southern Saskatchewan were exhibiting
supercell characteristics in an environment marked by near 60 kts
of effective bulk shear and a high based thermodynamic profile of
MLCAPE around 500-1000 J/kg. With right moving supercell motion
vectors oriented to the southeast at around 25 kts, this would
bring ongoing convection into Divide/Williams/Burke counties by
23-01Z. While boundary layer moisture is on the low side, strong
deep layer shear and enough instability may lead to an isolated
high based supercell threat this evening in northeast North Dakota
with a risk for large hail.

In far southwest North Dakota, visible satellite imagery recently
showed a field of more agitated cumulus. This will need to be
monitored for thunderstorm development over the next few hours as
it exhibits an environment of strong deep layer shear and adequate
instability for an isolated severe thunderstorm threat.

&&

.SHORT TERM...(This evening through Saturday)
Issued at 202 PM CDT Fri Jul 12 2019

Scattered thunderstorms forming on a trough axis/baroclinic zone
across eastern Montana. Expect thunderstorms will slowly increase
in intensity but be marginally severe as the CAPE is slim but the
shear looks strong. It might be difficult to initially sustain
strong updrafts with the shear of 50-60 kts but 500 to 800 cape
values. CAM models showing disorganized convection through mid
evening, then get a little e more organized across the southwest
and central. At this time will spread some low POPs across wets
and central north dakota with the best chance south central later
tonight. However will not add teh severe wording to the grids at
this time.

Saturday morning the remnants of the overnight convection will
will be exiting the region, with widely scattered thunderstorms.
Saturday will be a warm day with highs in the mid to upper 80s
and heat indexes near 90.

.LONG TERM...(Saturday night through Friday)
Issued at 202 PM CDT Fri Jul 12 2019

The extended period continues to look warm and fairly active with
a mean h500 ridge over the central and a trough over the western
CONUS. This flow will continue to keep shortwave energy in the
mix and a rather strong gradient flow will provide dynamic support
aloft.

Sunday should be the warmest day with highs in the mid 80s to
lower 90s and dewpoints in the 60s to around 70. Heat index values
will be in the 90s, to around 100 south. For this we will
highlight the heat in the weather story for Saturday and Sunday.

Temperatures in the low to mid 80s are expected for the beginning
of the work week then warming into the mid to upper 80s by
Friday. We will see daily chances of showers and thunderstorms.

&&

.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 553 PM CDT Fri Jul 12 2019

Main hazard for this forecast period will be isolated to scattered
thunderstorms developing this evening through the overnight
period. Confidence in timing/location was low through the
overnight period so TAFs generally kept to VCTS for now, favoring
the 00-06 UTC period. Otherwise VFR expected at all TAF sites.

&&

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

UPDATE...AE
SHORT TERM...WAA
LONG TERM...WAA
AVIATION...AE

Hazardous Weather Outlook
National Weather Service Bismarck ND
607 PM CDT Fri Jul 12 2019

NDZ001>005-009>013-017>023-025-031>037-040>048-050-051-132315-
Divide-Burke-Renville-Bottineau-Rolette-Williams-Mountrail-Ward-
McHenry-Pierce-McKenzie-Dunn-Mercer-Oliver-McLean-Sheridan-Wells-
Foster-Golden Valley-Billings-Stark-Morton-Burleigh-Kidder-
Stutsman-Slope-Hettinger-Grant-Bowman-Adams-Sioux-Emmons-Logan-
La Moure-McIntosh-Dickey-
607 PM CDT Fri Jul 12 2019 /507 PM MDT Fri Jul 12 2019/

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

Scattered thunderstorms, a few possibly strong to severe, are
possible this evening and tonight.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday

There are chances for thunderstorms Saturday through Thursday. A
few storms could be severe during this period. However,
uncertainty in details remains.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed.

Special Weather Statement
National Weather Service Bismarck ND
649 PM CDT Fri Jul 12 2019

NDZ001-009-130030-
Divide ND-Williams ND-
649 PM CDT Fri Jul 12 2019

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN WILLIAMS AND
SOUTHWESTERN DIVIDE COUNTIES UNTIL 730 PM CDT...

At 648 PM CDT, a strong thunderstorm was located 8 miles west of
Writing Rock State Historical Site, or 24 miles east of Plentywood,
moving southeast at 30 mph.

Penny size hail and wind gusts to 40 mph will be possible with this
storm.

Locations impacted include...
Grenora, Writing Rock State Historical Site, Hanks, Zahl and Appam.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4885 10405 4872 10344 4845 10371 4862 10405
TIME...MOT...LOC 2348Z 297DEG 24KT 4874 10404

SCHILD

Special Weather Statement
National Weather Service Bismarck ND
800 PM CDT Fri Jul 12 2019

NDZ009-130130-
Williams ND-
800 PM CDT Fri Jul 12 2019

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN WILLIAMS COUNTY
UNTIL 830 PM CDT...

At 800 PM CDT, a strong thunderstorm was located 6 miles southwest of
Wildrose, or 24 miles south of Crosby, moving southeast at 30 mph.

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

Locations impacted include...
Tioga and Corinth.

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

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4858 10289 4857 10288 4831 10297 4851 10348
      4864 10337 4864 10334
TIME...MOT...LOC 0100Z 297DEG 27KT 4856 10329

EDWARDS

Special Weather Statement
National Weather Service Bismarck ND
826 PM CDT Fri Jul 12 2019

NDZ009-017-130215-
McKenzie ND-Williams ND-
826 PM CDT Fri Jul 12 2019

...A STRONG THUNDERSTORM WILL AFFECT NORTHWESTERN MCKENZIE AND
SOUTHWESTERN WILLIAMS COUNTIES UNTIL 915 PM CDT/815 PM MDT/...

At 826 PM CDT/726 PM MDT/, a strong thunderstorm was located 8 miles
north of Fort Union Trading Post, or 19 miles west of Williston,
moving southeast at 35 mph.

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

Locations impacted include...
Alexander, Fort Union Trading Post, Trenton, Fort Buford State
Historical Site, Fort Union and Charbonneau.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4825 10405 4794 10335 4772 10374 4798 10405
TIME...MOT...LOC 0126Z 309DEG 32KT 4812 10404

EDWARDS

Special Weather Statement
National Weather Service Bismarck ND
830 PM CDT Fri Jul 12 2019

NDZ009-010-017-130215-
McKenzie ND-Mountrail ND-Williams ND-
830 PM CDT Fri Jul 12 2019

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN MCKENZIE...
NORTHEASTERN WILLIAMS AND NORTHWESTERN MOUNTRAIL COUNTIES UNTIL 915
PM CDT...

At 830 PM CDT, a strong thunderstorm was located near Tioga, or 26
miles west of Stanley, moving southeast at 35 mph.

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

Locations impacted include...
Stanley, Tioga, Ross, White Earth and White Earth Bay Recreation
Area.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4832 10313 4858 10300 4834 10226 4797 10267
TIME...MOT...LOC 0130Z 308DEG 30KT 4834 10296

SCHILD

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
847 PM CDT FRI JUL 12 2019

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

0835 PM     TSTM WND GST     2 SE TIOGA              48.38N 102.90W
07/12/2019  M68 MPH          WILLIAMS           ND   AWOS

&&

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE BISMARCK ND
915 PM CDT FRI JUL 12 2019

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

0707 PM     TSTM WND GST     8 N GRENORA             48.73N 103.94W
07/12/2019  M59 MPH          DIVIDE             ND   MESONET

            NDAWN MESONET SITE.

&&

AE