Area Forecast Discussion
Issued by NWS Pendleton, OR

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000
FXUS66 KPDT 281659
AFDPDT

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE PENDLETON OR
959 AM PDT SUN JUN 28 2015

.SHORT TERM...MORNING UPDATE...A STRONG UPPER LEVEL HIGH PRESSURE
RIDGE WILL CONTINUE OVER THE WESTERN U.S. TODAY. A WEAK UPPER LOW,
CURRENTLY NEAR 40N/128W, WILL SHIFT TO THE OREGON COAST TONIGHT.
THIS LOW WILL FORCE THE UPPER RIDGE AXIS TO SHIFT EAST OF THE
PACIFIC NORTHWEST OVERNIGHT. FOR TODAY, HIGH TEMPS WILL REMAIN WELL
ABOVE SEASONAL OVER A GOOD PORTION OF THE REGION. THUS WILL CONTINUE
THE CURRENT HEAT ADVISORIES. INCREASING CLOUD COVER WITH SHOWERS AND
THUNDERSTORMS WILL CAUSE HIGH TEMPS OVER CENTRAL OREGON TO COOL SOME
VERSUS SATURDAY AFTERNOON. A WEAK INTRUSION OF MARINE AIR WILL ALSO
BRING SOME COOLING TO THE CENTRAL COLUMBIA RIVER GORGE. THE THREAT
OF THUNDERSTORMS CONTINUES THROUGH TONIGHT DUE TO THE GENERAL HEAT
INDUCED INSTABILITY AND ENERGY AHEAD OF THE APPROACHING UPPER LOW.
MADE SOME ADJUSTMENTS TO TIMING AND COVERAGE OF STORMS TODAY AND
TONIGHT. ALSO ADDED THE MENTION OF GUSTY WINDS WITH THUNDERSTORMS
FOR THIS AFTERNOON AND EVENING. 90

.LONG TERM...PREVIOUS DISCUSSION...A LARGE MID/UPPER LEVEL RIDGE OF
HIGH PRESSURE WILL REMAIN OVER THE GREAT BASIN, THE PACIFIC
NORTHWEST AND WESTERN CANADA THROUGH INDEPENDENCE DAY. SINKING AIR
ALOFT ASSOCIATED WITH THE HIGH PRESSURE WILL RESULT IN DRY AND
STABLE CONDITIONS WITH HIGH TEMPERATURES EACH DAY WELL ABOVE NORMAL.
HIGH TEMPERATURES ON WEDNESDAY WILL BE IN THE 90S AND FOR THURSDAY
THROUGH INDEPENDENCE DAY HIGHS WILL BE IN THE UPPER 90S TO THE LOWER
TRIPLE DIGITS.

&&

.AVIATION...PREVIOUS DISCUSSION...12Z TAFS...VFR CONDITIONS WILL
PREVAIL THROUGH THE FORECAST PERIOD. MOSTLY MID CLOUDS ARE EXPECTED
THROUGH THE PERIOD BUT BY THIS AFTERNOON SCATTERED HIGH BASED
CUMULONIMBUS WILL DEVELOP AROUND THE AREA, ESPECIALLY OVER THE
MOUNTAINS AND INVOF KBDN AND KRDM. THE STORMS WILL MOVE NORTH
THROUGH THE EVENING AND POSSIBLY REACH KPDT AND KALW. WINDS COULD
EXCEED 40 KT NEAR THUNDERSTORMS. OTHERWISE, EXPECT WINDS WILL
INCREASE TO 10 TO 15 KTS WITH HIGHER GUSTS IN THE AFTERNOON.

&&

.FIRE WEATHER...

&&

.PRELIMINARY POINT TEMPS/POPS...
PDT 108  72  97  64 /  10  30  20  10
ALW 109  78  98  70 /  10  20  20  10
PSC 112  78 102  67 /  10  20  20  10
YKM 106  76  97  64 /  10  30  10  10
HRI 109  77 100  66 /  10  30  20  10
ELN 107  75  95  63 /  20  30  10  10
RDM  96  61  93  54 /  30  40  10  10
LGD 103  71  92  58 /  20  30  20  20
GCD 104  65  96  55 /  30  40  20  20
DLS  98  75  97  66 /  20  40  10  10

&&

.PDT WATCHES/WARNINGS/ADVISORIES...
OR...RED FLAG WARNING UNTIL 9 PM PDT THIS EVENING FOR ORZ639.

     RED FLAG WARNING UNTIL 4 PM PDT MONDAY FOR ORZ641-642-644.

     HEAT ADVISORY UNTIL 10 PM PDT THIS EVENING FOR ORZ044-049-050-
     505-507.

     RED FLAG WARNING UNTIL 9 PM PDT MONDAY FOR ORZ643-645.

     RED FLAG WARNING UNTIL 9 PM PDT THIS EVENING FOR ORZ610-611-640.

WA...RED FLAG WARNING UNTIL 9 PM PDT THIS EVENING FOR WAZ639-681.

     HEAT ADVISORY UNTIL 10 PM PDT THIS EVENING FOR WAZ026>029.

     RED FLAG WARNING UNTIL 9 PM PDT MONDAY FOR WAZ643-645.

     RED FLAG WARNING FROM 5 PM THIS AFTERNOON TO 8 PM PDT MONDAY FOR
     WAZ675.

&&

FOR ADDITIONAL WEATHER INFORMATION, CHECK OUR WEB SITE AT...
WWW.WEATHER.GOV/PENDLETON

$$

90/99/97/85


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