Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 318
NWS Storm Prediction Center Norman OK
355 PM MDT Mon Jun 29 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Eastern Montana
Western North Dakota
Western South Dakota
Northeast Wyoming
* Effective this Monday afternoon from 355 PM until Midnight MDT.
* Primary threats include...
A couple tornadoes possible
Scattered large hail likely with isolated very large hail events
to 3 inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Supercells are expected to develop especially across
eastern Montana/western North Dakota through late afternoon/early
evening, especially in vicinity of a surface low and warm front
where the large hail and tornado risk should be maximized. Other
somewhat higher based storms including supercells are expected
farther south across northeast Wyoming and western South Dakota.
The tornado watch area is approximately along and 90 statute miles
east and west of a line from 60 miles north of Williston ND to 50
miles east southeast of Gillette WY. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 21020.
...Guyer
SEL8
URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 318
NWS Storm Prediction Center Norman OK
355 PM MDT Mon Jun 29 2020
The NWS Storm Prediction Center has issued a
* Tornado Watch for portions of
Eastern Montana
Western North Dakota
Western South Dakota
Northeast Wyoming
* Effective this Monday afternoon from 355 PM until Midnight MDT.
* Primary threats include...
A couple tornadoes possible
Scattered large hail likely with isolated very large hail events
to 3 inches in diameter possible
Scattered damaging wind gusts to 70 mph possible
SUMMARY...Supercells are expected to develop especially across
eastern Montana/western North Dakota through late afternoon/early
evening, especially in vicinity of a surface low and warm front
where the large hail and tornado risk should be maximized. Other
somewhat higher based storms including supercells are expected
farther south across northeast Wyoming and western South Dakota.
The tornado watch area is approximately along and 90 statute miles
east and west of a line from 60 miles north of Williston ND to 50
miles east southeast of Gillette WY. For a complete depiction of the
watch see the associated watch outline update (WOUS64 KWNS WOU8).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.
&&
AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 3 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 21020.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW8
WW 318 TORNADO MT ND SD WY 292155Z - 300600Z
AXIS..90 STATUTE MILES EAST AND WEST OF LINE..
60N ISN/WILLISTON ND/ - 50ESE GCC/GILLETTE WY/
..AVIATION COORDS.. 80NM E/W /52N ISN - 69W RAP/
HAIL SURFACE AND ALOFT..3 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 550. MEAN STORM MOTION VECTOR 21020.
LAT...LON 49030164 44050279 44050641 49030562
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU8.
Watch 318 Status Report Messages:
STATUS REPORT #4 ON WW 318
VALID 300535Z - 300640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 60 NNE RAP
TO 40 SE 2WX TO 10 W Y22 TO 20 E Y22.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 1056
..GLEASON..06/30/20
ATTN...WFO...BYZ...GGW...BIS...UNR...
&&
STATUS REPORT FOR WT 318
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
SDC105-300640-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
PERKINS
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 318
VALID 300245Z - 300340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 45 ESE GCC
TO 25 SSE BHK TO 40 NNE BHK TO 25 W SDY TO 70 NNE OLF.
..SPC..06/30/20
ATTN...WFO...BYZ...GGW...BIS...UNR...
&&
STATUS REPORT FOR WT 318
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC011-083-085-091-300340-
MT
. MONTANA COUNTIES INCLUDED ARE
CARTER RICHLAND ROOSEVELT
SHERIDAN
$$
NDC001-013-023-025-041-053-055-057-061-075-089-101-105-300340-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BURKE DIVIDE
DUNN HETTINGER MCKENZIE
MCLEAN MERCER MOUNTRAIL
RENVILLE STARK WARD
WILLIAMS
$$
SDC019-063-081-093-105-300340-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BUTTE HARDING LAWRENCE
MEADE PERKINS
$$
WYC011-045-300340-
WY
. WYOMING COUNTIES INCLUDED ARE
CROOK WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 318
VALID 300130Z - 300240Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 SW GCC TO
30 NNE 4BQ TO 35 SSW GDV TO 20 ENE OLF TO 65 NNE OLF.
..SPC..06/30/20
ATTN...WFO...BYZ...GGW...BIS...UNR...
&&
STATUS REPORT FOR WT 318
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC011-021-025-083-085-091-109-300240-
MT
. MONTANA COUNTIES INCLUDED ARE
CARTER DAWSON FALLON
RICHLAND ROOSEVELT SHERIDAN
WIBAUX
$$
NDC001-007-011-013-023-025-033-041-053-055-057-061-075-087-089-
101-105-300240-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BILLINGS BOWMAN
BURKE DIVIDE DUNN
GOLDEN VALLEY HETTINGER MCKENZIE
MCLEAN MERCER MOUNTRAIL
RENVILLE SLOPE STARK
WARD WILLIAMS
$$
SDC019-063-081-093-105-300240-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BUTTE HARDING LAWRENCE
MEADE PERKINS
$$
WYC005-011-045-300240-
WY
. WYOMING COUNTIES INCLUDED ARE
CAMPBELL CROOK WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 318
VALID 292345Z - 300040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..SPC..06/29/20
ATTN...WFO...BYZ...GGW...BIS...UNR...
&&
STATUS REPORT FOR WT 318
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC011-017-021-025-055-075-079-083-085-091-109-300040-
MT
. MONTANA COUNTIES INCLUDED ARE
CARTER CUSTER DAWSON
FALLON MCCONE POWDER RIVER
PRAIRIE RICHLAND ROOSEVELT
SHERIDAN WIBAUX
$$
NDC001-007-011-013-023-025-033-041-053-055-057-061-075-087-089-
101-105-300040-
ND
. NORTH DAKOTA COUNTIES INCLUDED ARE
ADAMS BILLINGS BOWMAN
BURKE DIVIDE DUNN
GOLDEN VALLEY HETTINGER MCKENZIE
MCLEAN MERCER MOUNTRAIL
RENVILLE SLOPE STARK
WARD WILLIAMS
$$
SDC019-063-081-093-105-300040-
SD
. SOUTH DAKOTA COUNTIES INCLUDED ARE
BUTTE HARDING LAWRENCE
MEADE PERKINS
$$
WYC005-011-045-300040-
WY
. WYOMING COUNTIES INCLUDED ARE
CAMPBELL CROOK WESTON
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Mod (40%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (10%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (40%)
|
Probability of 1 or more wind events > 65 knots
|
Low (20%)
|
Hail
Probability of 10 or more severe hail events
|
High (70%)
|
Probability of 1 or more hailstones > 2 inches
|
Mod (40%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (90%)
|
For each watch, probabilities for particular events inside the watch
(listed above in each table) are determined by the issuing forecaster.
The "Low" category contains probability values ranging from less than 2%
to 20% (EF2-EF5 tornadoes), less than 5% to 20% (all other probabilities),
"Moderate" from 30% to 60%, and "High" from 70% to greater than 95%.
High values are bolded and lighter in color to provide awareness of
an increased threat for a particular event.
weather.gov 
@NWSSPC
