200
FNUS76 KPDT 031853
FWSPDT
SPOT FORECAST FOR MACK CREEK RX...UNIVERSITY OF IDAHO
NATIONAL WEATHER SERVICE PENDLETON OR
1153 AM PDT SAT OCT 3 2026
FORECAST IS BASED ON IGNITION TIME OF 1200 PDT ON OCTOBER 03.
***THUNDERSTORMS IMPLY GUSTY AND ERRATIC WINDS ***
***WINDS ARE 20 FOOT 10-MINUTE AVERAGES ***
***CWR: CHANCE OF WETTING RAIN 0.10 OR GREATER ***
***VENTILATION INDEX IS DERIVED FROM TRANSPORT WIND
MULTIPLIED BY THE MIXING HEIGHT IN 100'S OF FT.
CATEGORIES ARE A GENERALIZED INDICATOR ONLY:
LOW (< 200), MODERATE (200-500), HIGH (500-700),
AND VERY HIGH (> 700). ***
IF YOU HAVE QUESTIONS OR CONCERNS WITH THIS FORECAST, PLEASE
CONTACT OUR OFFICE AT (541) 276-8134.
DISCUSSION
HIGH PRESSURE BUILDING OVER THE AREA WILL RESULT
IN DIURNALLY/TERRAIN DRIVEN WINDS TODAY AND TOMORROW, WITH
SOUTH TO SOUTHEAST WINDS DURING THE DAY AND DRAINAGE WINDS
OVERNIGHT. AFTERNOON RHS WILL BE IN THE UPPER 30S TODAY AND
LOWER 30S TOMORROW WITH EXCELLENT OVERNIGHT RECOVERY. LOW LEVEL
INVERSION WILL DEVELOP BETWEEN 6PM AND 7PM THIS EVENING, THEN
LIFT AROUND 10AM, BUT PERSISTENT MID LEVEL INVERSION ALOFT WILL
KEEP MIXING HEIGHTS BELOW 3KFT AGL TOMORROW.
REST OF TODAY
SKY/WEATHER.........SUNNY (0-10 PERCENT).
MAX TEMPERATURE.....75-78.
MIN HUMIDITY........37-42 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 4 TO 8 MPH.
MIXING HEIGHT.......3600 FT AGL.
TRANSPORT WINDS.....SOUTHEAST 7 TO 10 MPH.
VENTILATION INDEX...MODERATE (280).
TIME (PDT) 12P 1PM 2PM 3PM 4PM 5PM 6PM 7PM 8PM 9PM 10P 11P
TEMP............69 72 74 74 75 74 71 68 61 58 56 53
RH..............53 48 44 42 41 42 49 55 64 70 75 79
20 FT WIND DIR..SE SE SE SE SE SE SE E NE NE NE N
20 FT WIND SPD..6 7 7 8 7 5 4 3 4 4 3 2
20 FT WIND GUST.
TONIGHT
SKY/WEATHER.........MOSTLY CLEAR (0-10 PERCENT).
MIN TEMPERATURE.....45-48.
MAX HUMIDITY........84-89 PERCENT.
WIND (20 FT)........SOUTHEAST WINDS 4 TO 8 MPH SHIFTING TO THE
NORTHEAST AFTER 7PM, THEN BECOMING LIGHT
DRAINAGE WINDS AROUND 10PM.
MIXING HEIGHT.......1600 FT AGL EARLY IN THE EVENING THEN 500 FT
AGL OVERNIGHT.
TRANSPORT WINDS.....EAST 6 TO 7 MPH SHIFTING TO THE NORTHEAST
AROUND 5 MPH LATE IN THE EVENING.
VENTILATION INDEX...LOW (50) DECREASING TO LOW (30) OVERNIGHT.
SUNDAY
SKY/WEATHER.........MOSTLY SUNNY (20-30 PERCENT).
MAX TEMPERATURE.....79-82.
MIN HUMIDITY........31-36 PERCENT.
WIND (20 FT)........LIGHT DRAINAGE WINDS BECOMING SOUTHEAST
4 TO 7 MPH AROUND 12PM, THEN SHIFTING
TO THE SOUTH AROUND 2PM.
MIXING HEIGHT.......2700 FT AGL.
TRANSPORT WINDS.....NORTHEAST AROUND 5 MPH EARLY IN THE MORNING
BECOMING LIGHT, THEN BECOMING SOUTH 5 TO 6 MPH
LATE IN THE MORNING BECOMING LIGHT.
VENTILATION INDEX...LOW (30) INCREASING TO LOW (100) IN THE
AFTERNOON.
FORECASTER...LAWHORN
REQUESTED BY...HEATHER HEWARD
TYPE OF REQUEST...PRESCRIBED
.TAG 2623012.0/PDT
.DELDT 10/03/26
.FORMATTERVERSION 2.0.0
.EMAIL HHEWARD@UIDAHO.EDU
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