Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 197
NWS Storm Prediction Center Norman OK
305 PM MDT Wed May 20 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and Eastern Montana
* Effective this Wednesday afternoon and evening from 305 PM
until 1100 PM MDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Thunderstorms will continue to intensify initially across
central/southern Montana this afternoon, and subsequent
spread/develop north-northeastward across east-central Montana by
evening. Severe hail/wind are the primary risks.
The severe thunderstorm watch area is approximately along and 125
statute miles east and west of a line from 55 miles north northwest
of Glasgow MT to 70 miles west southwest of Broadus MT. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for 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. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 195...WW 196...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
21025.
...Guyer
SEL7
URGENT - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Watch Number 197
NWS Storm Prediction Center Norman OK
305 PM MDT Wed May 20 2020
The NWS Storm Prediction Center has issued a
* Severe Thunderstorm Watch for portions of
Central and Eastern Montana
* Effective this Wednesday afternoon and evening from 305 PM
until 1100 PM MDT.
* Primary threats include...
Scattered large hail and isolated very large hail events to 2
inches in diameter possible
Isolated damaging wind gusts to 70 mph possible
A tornado or two possible
SUMMARY...Thunderstorms will continue to intensify initially across
central/southern Montana this afternoon, and subsequent
spread/develop north-northeastward across east-central Montana by
evening. Severe hail/wind are the primary risks.
The severe thunderstorm watch area is approximately along and 125
statute miles east and west of a line from 55 miles north northwest
of Glasgow MT to 70 miles west southwest of Broadus MT. For a
complete depiction of the watch see the associated watch outline
update (WOUS64 KWNS WOU7).
PRECAUTIONARY/PREPAREDNESS ACTIONS...
REMEMBER...A Severe Thunderstorm Watch means conditions are
favorable for 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. Severe thunderstorms can and occasionally do produce
tornadoes.
&&
OTHER WATCH INFORMATION...CONTINUE...WW 195...WW 196...
AVIATION...A few severe thunderstorms with hail surface and aloft to
2 inches. Extreme turbulence and surface wind gusts to 60 knots. A
few cumulonimbi with maximum tops to 450. Mean storm motion vector
21025.
...Guyer
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW7
WW 197 SEVERE TSTM MT 202105Z - 210500Z
AXIS..125 STATUTE MILES EAST AND WEST OF LINE..
55NNW GGW/GLASGOW MT/ - 70WSW 4BQ/BROADUS MT/
..AVIATION COORDS.. 110NM E/W /48NNW GGW - 18NE SHR/
HAIL SURFACE AND ALOFT..2 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 450. MEAN STORM MOTION VECTOR 21025.
LAT...LON 48920433 45010417 45010928 48920984
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU7.
Watch 197 Status Report Messages:
STATUS REPORT #4 ON WW 197
VALID 210345Z - 210440Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 N SDY TO
15 NE OLF TO 20 WNW OLF TO 30 SSE GGW TO 35 S GGW TO 40 WSW GGW
TO 55 ENE HVR.
..SPC..05/21/20
ATTN...WFO...BYZ...TFX...GGW...
&&
STATUS REPORT FOR WS 197
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC019-071-085-105-210440-
MT
. MONTANA COUNTIES INCLUDED ARE
DANIELS PHILLIPS ROOSEVELT
VALLEY
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 197
VALID 210235Z - 210340Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 25 N BHK TO
35 NNW MLS TO 70 WNW MLS TO 70 E LWT TO 55 NE LWT TO 10 S HVR.
..SPC..05/21/20
ATTN...WFO...BYZ...TFX...GGW...
&&
STATUS REPORT FOR WS 197
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC005-019-021-033-055-071-079-083-085-105-109-210340-
MT
. MONTANA COUNTIES INCLUDED ARE
BLAINE DANIELS DAWSON
GARFIELD MCCONE PHILLIPS
PRAIRIE RICHLAND ROOSEVELT
VALLEY WIBAUX
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 197
VALID 210050Z - 210140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 55 ESE 4BQ
TO 15 ENE 4BQ TO 45 SW MLS TO 50 ENE BIL TO 60 N BIL TO 30 NE LWT
TO 50 N LWT.
..SPC..05/21/20
ATTN...WFO...BYZ...TFX...GGW...
&&
STATUS REPORT FOR WS 197
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC005-011-017-019-021-025-027-033-055-065-069-071-079-083-085-
087-103-105-109-210140-
MT
. MONTANA COUNTIES INCLUDED ARE
BLAINE CARTER CUSTER
DANIELS DAWSON FALLON
FERGUS GARFIELD MCCONE
MUSSELSHELL PETROLEUM PHILLIPS
PRAIRIE RICHLAND ROOSEVELT
ROSEBUD TREASURE VALLEY
WIBAUX
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 197
VALID 210005Z - 210140Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 50 SE 4BQ TO
50 NNE SHR TO 35 ESE BIL TO 10 SSW LWT.
..SPC..05/21/20
ATTN...WFO...BYZ...TFX...GGW...
&&
STATUS REPORT FOR WS 197
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC003-005-011-017-019-021-025-027-033-055-065-069-071-075-079-
083-085-087-103-105-109-111-210140-
MT
. MONTANA COUNTIES INCLUDED ARE
BIG HORN BLAINE CARTER
CUSTER DANIELS DAWSON
FALLON FERGUS GARFIELD
MCCONE MUSSELSHELL PETROLEUM
PHILLIPS POWDER RIVER PRAIRIE
RICHLAND ROOSEVELT ROSEBUD
TREASURE VALLEY WIBAUX
YELLOWSTONE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (20%)
|
Probability of 1 or more strong (EF2-EF5) tornadoes
|
Low (<2%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Low (10%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (50%)
|
Probability of 1 or more hailstones > 2 inches
|
Mod (30%)
|
Combined Severe Hail/Wind
Probability of 6 or more combined severe hail/wind events
|
High (70%)
|
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
