Severe Thunderstorm Warning 29, NWS Pendleton, OR

NORTHEAST OREGON/SOUTHEAST WASHINGTON FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
830 PM PDT WED AUG 6 2003

A WEAK SHORT WAVE MOVED THROUGH WALLOWA COUNTY NEAR 00Z AND
CONTAINED ENOUGH FORCING TO INITIATE DECENT SHOWERS AND
THUNDERSTORMS BEFORE EXITING INTO IDAHO. IN ADDITION SHOWERS AND
THUNDERSTORMS ARE FIRING OFF AHEAD OF A PRETTY DECENT SHORTWAVE
MOVING INTO SOUTHWEST OREGON. THIS IS A GOOD INDICATOR OF HOW
UNSTABLE THE ATMOSPHERE OVER THE PACIFIC NORTHWEST IS THIS PM.
EXPECT THE SHORT WAVE TO BE THE FOCUSING POINT FOR CONTINUED
THUNDERSTORM ACTIVITY THROUGH THE NIGHT. AT THIS TIME THE TRACK OF
THE SHORTWAVE APPEARS TO BE NORTHERLY ALONG THE CASCADES AND EAST
SLOPES. CURRENT FORECASTS ARE IN LINE FOR THE TIME BEING. A FEW WEAK
RETURNS SHOWING UP GRANT COUNTY AS WELL...BUT SPOTTERS ARE
INDICATING ONLY MID LEVEL CLOUDINESS. AS SUCH ANY UP DATES WOULD BE
FOR THE CONVECTIVE POTENTIAL ACROSS THE EASTERN PORTIONS OF THE
CWFA. I WILL GIVE A LITTLE TIME TO LET THINGS SHAKE OUT BEFORE
REMOVING ANY THUNDERSTORM WORDING. IN THE MEAN TIME THE UPPER LOW
WILL CONTINUE TO SPIN AND WOBBLE AROUND OFF THE COAST OF WASHINGTON
AND B.C.. THIS KEEPS THE REGION IN A WARM AND SOMEWHAT UNSTABLE S-SW
FLOW...THEREFORE ANY EJECTED SHORTWAVES WILL BRING THE POTENTIAL FOR
CONVECTION THROUGH THE SHORT TERM. TOBIN

PDT 321-  ALW 321-  PSC 221-  YKM 111-

.KPDT...NONE.

ORZ041>050-WAZ024>030-071200-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE PENDLETON OR
500 AM PDT WED AUG 6 2003

THIS HAZARDOUS WEATHER OUTLOOK IS FOR CENTRAL AND NORTHEAST OREGON
AS WELL AS SOUTH CENTRAL AND SOUTHEAST WASHINGTON.

.DAY ONE...

SHOWERS AND ISOLATED THUNDERSTORMS HAVE FORMED OVER GRANT COUNTY AND
ARE MOVING NORTH THROUGH THE MOUNTAINS OF NORTHEAST OREGON. A
DISTURBANCE WILL MOVE NORTH ALONG THE CASCADES THIS AFTERNOON.
INCREASED INSTABILITY AND DAYTIME HEATING WILL COMBINE TO TRIGGER
SCATTERED THUNDERSTORMS...MAINLY OVER THE MOUNTAINS OF NORTHEAST
OREGON AND ALONG THE CASCADES. STRONG WINDS...RAIN...HAIL...AND
LIGHTNING WILL ACCOMPANY THESE STORMS.

.DAYS TWO THROUGH SEVEN...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

A MOIST SOUTHWEST FLOW PATTERN ALOFT WILL CONTINUE THROUGH THE
PERIOD. HOWEVER THE ATMOSPHERE WILL BE MORE STABLE WITH LESS SHOWER
AND THUNDERSTORM ACTIVITY EXPECTED.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION MAY BE REQUIRED.

WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER
CONDITIONS ACCORDING TO STANDARD OPERATING PROCEDURES.