Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL0
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 670
NWS STORM PREDICTION CENTER NORMAN OK
735 PM MDT THU AUG 6 2009
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
PARTS OF NORTH CENTRAL AND NORTHEAST MONTANA
EFFECTIVE THIS THURSDAY NIGHT AND FRIDAY MORNING FROM 735 PM
UNTIL 200 AM MDT.
HAIL TO 2.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 70
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 60
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 115 MILES WEST
SOUTHWEST OF GLASGOW MONTANA TO 35 MILES SOUTH SOUTHEAST OF WOLF
POINT MONTANA. FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU0).
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 667...WW 668...WW 669...
DISCUSSION...SEVERE THUNDERSTORMS CONTINUE TO DEVELOP/MOVE EWD INTO
A MOIST AND UNSTABLE AIR MASS ACROSS THE WATCH AREA. FAVORABLE DEEP
LAYER SHEAR WILL MAINTAIN THREAT FOR SHORT LINE SEGMENTS ENHANCING
THE WIND DAMAGE THREAT.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 2.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 24030.
...HALES
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW0
WW 670 SEVERE TSTM MT 070135Z - 070800Z
AXIS..60 STATUTE MILES NORTH AND SOUTH OF LINE..
115WSW GGW/GLASGOW MT/ - 35SSE OLF/WOLF POINT MT/
..AVIATION COORDS.. 50NM N/S /42NE LWT - 64ESE GGW/
HAIL SURFACE AND ALOFT..2.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 24030.
LAT...LON 48430890 48500529 46750529 46680890
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU0.
Watch 670 Status Report Messages:
STATUS REPORT #5 ON WW 670
VALID 070635Z - 070740Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 70 NNE BIL
TO 85 E LWT TO 65 S GGW TO 30 SE OLF.
..EDWARDS..08/07/09
ATTN...WFO...GGW...
&&
STATUS REPORT FOR WS 670
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC033-055-070740-
MT
. MONTANA COUNTIES INCLUDED ARE
GARFIELD MCCONE
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #4 ON WW 670
VALID 070555Z - 070640Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 75 NNE BIL
TO 75 SSW GGW TO 40 SW GGW TO 40 WNW GGW.
..EDWARDS..08/07/09
ATTN...WFO...GGW...
&&
STATUS REPORT FOR WS 670
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC033-055-105-070640-
MT
. MONTANA COUNTIES INCLUDED ARE
GARFIELD MCCONE 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 670
VALID 070430Z - 070540Z
SEVERE WEATHER THREAT CONTINUES RIGHT OF A LINE FROM 75 NNE BIL
TO 75 E LWT TO 75 NE LWT TO 45 E HVR.
..MEAD..08/07/09
ATTN...WFO...GGW...
&&
STATUS REPORT FOR WS 670
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC033-055-071-105-070540-
MT
. MONTANA COUNTIES INCLUDED ARE
GARFIELD MCCONE PHILLIPS
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 #2 ON WW 670
VALID 070335Z - 070440Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/07/09
ATTN...WFO...GGW...
&&
STATUS REPORT FOR WS 670
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC033-055-069-071-105-070440-
MT
. MONTANA COUNTIES INCLUDED ARE
GARFIELD MCCONE PETROLEUM
PHILLIPS 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 #1 ON WW 670
VALID 070230Z - 070340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..MEAD..08/07/09
ATTN...WFO...GGW...
&&
STATUS REPORT FOR WS 670
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
MTC033-055-069-071-105-070340-
MT
. MONTANA COUNTIES INCLUDED ARE
GARFIELD MCCONE PETROLEUM
PHILLIPS VALLEY
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (20%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (5%)
|
Wind
Probability of 10 or more severe wind events
|
Mod (30%)
|
Probability of 1 or more wind events > 65 knots
|
Mod (30%)
|
Hail
Probability of 10 or more severe hail events
|
Mod (30%)
|
Probability
of 1 or
more hailstones > 2 inches
|
Low (20%)
|
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% (F2-F5 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.
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