Note:
The expiration time in the watch graphic is amended if the watch is
replaced, cancelled or extended.
Note: Click for
Watch Status Reports.
SEL3
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 303
NWS STORM PREDICTION CENTER NORMAN OK
130 PM MDT SAT MAY 14 2011
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
MUCH OF EASTERN OREGON
EFFECTIVE THIS SATURDAY AFTERNOON AND EVENING FROM 130 PM UNTIL
800 PM MDT.
HAIL TO 1.5 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 80
STATUTE MILES EAST AND WEST OF A LINE FROM 20 MILES NORTH OF
PENDLETON OREGON TO 40 MILES SOUTH OF ROME OREGON. FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU3).
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 302...
DISCUSSION...AHEAD OF STRONG UPPER TROUGH OFF OR COAST...WIND FIELDS
HAVE INCREASED AS WELL AS INSTABILITY. THUNDERSTORMS DEVELOPING
OVER HIGHER TERRAIN OF ERN OR WILL INTENSIFY AND INCREASE IN NUMBER
THROUGH THE AFTERNOON. PRIMARY THREAT WILL BE MULTICELLULAR STORMS
RESULTING IN LARGE HAIL AND LOCAL DOWNBURST WINDS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 60
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 500. MEAN STORM
MOTION VECTOR 18025.
...HALES
Note:
The Aviation Watch (SAW) product is an approximation to the watch area.
The actual watch is depicted by the shaded areas.
SAW3
WW 303 SEVERE TSTM OR 141930Z - 150200Z
AXIS..80 STATUTE MILES EAST AND WEST OF LINE..
20N PDT/PENDLETON OR/ - 40S REO/ROME OR/
..AVIATION COORDS.. 70NM E/W /18NNE PDT - 35S REO/
HAIL SURFACE AND ALOFT..1.5 INCHES. WIND GUSTS..60 KNOTS.
MAX TOPS TO 500. MEAN STORM MOTION VECTOR 18025.
LAT...LON 45971716 42001630 42001943 45972050
THIS IS AN APPROXIMATION TO THE WATCH AREA. FOR A
COMPLETE DEPICTION OF THE WATCH SEE WOUS64 KWNS
FOR WOU3.
Watch 303 Status Report Messages:
STATUS REPORT #5 ON WW 303
VALID 150135Z - 150200Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
WW 303 WILL BE ALLOWED TO EXPIRE AT 150200Z.
..SMITH..05/15/11
ATTN...WFO...BOI...PDT...
&&
STATUS REPORT FOR WS 303
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ORC001-013-021-023-025-045-049-059-061-063-069-150200-
OR
. OREGON COUNTIES INCLUDED ARE
BAKER CROOK GILLIAM
GRANT HARNEY MALHEUR
MORROW UMATILLA UNION
WALLOWA WHEELER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #4 ON WW 303
VALID 150040Z - 150140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..SMITH..05/15/11
ATTN...WFO...BOI...PDT...
&&
STATUS REPORT FOR WS 303
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ORC001-013-021-023-025-045-049-059-061-063-069-150140-
OR
. OREGON COUNTIES INCLUDED ARE
BAKER CROOK GILLIAM
GRANT HARNEY MALHEUR
MORROW UMATILLA UNION
WALLOWA WHEELER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #3 ON WW 303
VALID 142335Z - 150040Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
FOR ADDITIONAL INFORMATION SEE MESOSCALE DISCUSSION 791
..SMITH..05/14/11
ATTN...WFO...BOI...PDT...
&&
STATUS REPORT FOR WS 303
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ORC001-013-021-023-025-045-049-059-061-063-069-150040-
OR
. OREGON COUNTIES INCLUDED ARE
BAKER CROOK GILLIAM
GRANT HARNEY MALHEUR
MORROW UMATILLA UNION
WALLOWA WHEELER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #2 ON WW 303
VALID 142225Z - 142340Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..SMITH..05/14/11
ATTN...WFO...BOI...PDT...
&&
STATUS REPORT FOR WS 303
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ORC001-013-021-023-025-045-049-059-061-063-069-142340-
OR
. OREGON COUNTIES INCLUDED ARE
BAKER CROOK GILLIAM
GRANT HARNEY MALHEUR
MORROW UMATILLA UNION
WALLOWA WHEELER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
STATUS REPORT #1 ON WW 303
VALID 142045Z - 142140Z
THE SEVERE WEATHER THREAT CONTINUES ACROSS THE ENTIRE WATCH AREA.
..ROGERS..05/14/11
ATTN...WFO...BOI...PDT...
&&
STATUS REPORT FOR WS 303
SEVERE WEATHER THREAT CONTINUES FOR THE FOLLOWING AREAS
ORC001-013-021-023-025-045-049-059-061-063-069-142140-
OR
. OREGON COUNTIES INCLUDED ARE
BAKER CROOK GILLIAM
GRANT HARNEY MALHEUR
MORROW UMATILLA UNION
WALLOWA WHEELER
$$
THE WATCH STATUS MESSAGE IS FOR GUIDANCE PURPOSES ONLY. PLEASE
REFER TO WATCH COUNTY NOTIFICATION STATEMENTS FOR OFFICIAL
INFORMATION ON COUNTIES...INDEPENDENT CITIES AND MARINE ZONES
CLEARED FROM SEVERE THUNDERSTORM AND TORNADO WATCHES.
$$
Note:
Click for Complete Product Text.
Tornadoes
Probability of 2 or more tornadoes
|
Low (10%)
|
Probability of 1 or more strong (F2-F5) tornadoes
|
Low (<2%)
|
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 (50%)
|
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.