000 FNUS56 KPDT 201552 FWFPDT FIRE WEATHER FORECAST NATIONAL WEATHER SERVICE PENDLETON OR 900 AM PDT TUE AUG 20 2002 CLOUTIER ...ISOLATED SHOWERS AND THUNDERSTORMS IN THE MOUNTAINS TODAY AND WEDNESDAY... DISCUSSION...AN UPPER LOW PRESSURE SYSTEM WILL MOVE OVER THE DISTRICT TODAY WITH A MARINE PUSH CAUSING COOLER AND MORE HUMID AIR TO FILTER EAST OF THE CASCADES. THE ATMOSPHERE WILL BECOME MORE UNSTABLE THIS AFTERNOON AND WILL CONTINUE THROUGH WEDNESDAY. THIS WILL RESULT IN SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS... MAINLY IN THE MOUNTAINS. ***THUNDERSTORMS IMPLY GUSTY AND ERRATIC WINDS*** ***CWR = CHANCE OF A WETTING RAIN WHICH IS GREATER THAN .10*** ***WINDS ARE 20 FOOT/10 MINUTE AVERAGE*** HIGH ELEVATION HAINES INDEX OBSERVED TUESDAY AUG 20... SALEM...2 MEDFORD...2 SPOKANE..3 BOISE...3 ZONE: 630...CENTRAL MOUNTAINS OF OREGON: TODAY... WEATHER...MOSTLY CLOUDY. ISOLATED SHOWERS AND THUNDERSTORMS LATE THIS AFTERNOON OVER THE OCHOCO MOUNTAINS. MAX TEMP...64-68 RIDGES...67-73 VALLEYS. 24 HR TREND...DOWN 4-6. MIN RH...30-40 PCT RIDGES...25-35 PCT VALLEYS. 24 HR TREND...UP 10-20 PCT. 20 FT WIND...NW-N 5-10 MPH WITH GUSTS TO 15-20 MPH. RIDGE TOP WIND...W-NW 6-12 MPH WITH GUSTS 20-25 MPH. CWR...10 PCT OVER THE OCHOCO MOUNTAINS...0 PCT ELSEWHERE. LAL...1-2. HAINES...4 (LOW). TONIGHT... WEATHER...PARTLY CLOUDY. ISOLATED EVENING SHOWERS AND THUNDERSTORMS. MIN TEMP...40-45 RIDGES...38-43 VALLEYS. 24 HR TREND...LITTLE CHANGE. MAX RH...55-65 PCT RIDGES...75-85 VALLEYS AND MEADOWS. 24 TREND...UP 4-6 PCT. 20 FOOT WIND...EVENING W-NW 5-10 MPH WITH GUSTS 15-20 MPH...DECREASING TO 5-10 MPH AFTER MIDNIGHT. RIDGE TOP WIND...EVENING W-NW 7-13 MPH WITH GUSTS 20-25 MPH...DECREASING TO 5-10 MPH AFTER MIDNIGHT. CWR...10 PCT. LAL...2 EARLY...BECOMING 1 BY MIDNIGHT. HAINES...4 (LOW). WEDNESDAY... WEATHER...PARTLY CLOUDY. MAX TEMP...65-71 RIDGES...71-77 VALLEYS. 24 HR TREND...UP 1-3. MIN RH...30-40 PCT RIDGES...25-35 PCT VALLEYS. 24 HR TREND...LITTLE CHANGE. 20 FT WIND...N 5-8 MPH WITH GUSTS TO 18 MPH. RIDGE TOP WIND...N 6-12 MPH WITH GUSTS TO 25 MPH. CWR...00 PCT. LAL...1. HAINES...4 (LOW). ZONES: 632,633,634,635,638...NORTHEAST OREGON MOUNTAINS: TODAY... WEATHER...MOSTLY CLOUDY. ISOLATED AFTERNOON SHOWERS OR THUNDERSTORMS. MAX TEMP...63-68 RIDGES...68-73 VALLEYS. 24 HR TREND...DOWN 10-15. MIN RH...40-50 PCT RIDGES...35-45 PCT VALLEYS. 24 HR TREND...UP 20-30 PCT. 20 FT WIND...NW 4-8 MPH WITH GUSTS TO 12-18 MPH. RIDGE TOP WIND...NW 6-12 WITH GUSTS TO 20-25 MPH. CWR...10 PCT. LAL...1-2. HAINES...4 (LOW). TONIGHT... WEATHER...MOSTLY CLOUDY WITH ISOLATED SHOWERS AND EVENING THUNDERSTORMS. SNOW LEVEL LOWERING TO AROUND 7500 FEET OVERNIGHT. MIN TEMP...42-52 RIDGES...32-42 VALLEYS AND HIGHER MOUNTAINS/MEADOWS. 24 HR TREND...LITTLE CHANGE. MAX RH...55-65 PCT RIDGES...70-80 PCT VALLEYS/MEADOWS 24 TREND...UP 2-4 PCT. 20 FOOT WIND...W-NW 5-8 MPH WITH EVENING GUSTS TO 15 MPH... BECOMING DOWNSLOPE 2-5 MPH AROUND MIDNIGHT. RIDGE TOP WIND...W-NW 6-10 MPH WITH EVENING GUSTS TO 20 MPH. CWR...20 PCT. LAL...1-2. HAINES...4 (LOW). WEDNESDAY... WEATHER...MOSTLY CLOUDY WITH ISOLATED SHOWERS OR THUNDERSTORMS. MAX TEMP...65-70 RIDGES...70-75 VALLEYS. 24 HR TREND...UP 1-3. MIN RH...38-44 PCT RIDGES....35-45 PCT VALLEYS. 24 HR TREND...DOWN 2-3 RIDGES...LITTLE CHANGE VALLEYS. 20 FT WIND...NW-N 5-8 MPH WITH GUSTS TO 20 MPH. RIDGE TOP WIND...NW 8-13 MPH WITH AFTERNOON GUSTS TO 25 MPH. CWR...10 PCT. LAL...1-2. HAINES...4 (LOW). ZONE 631 AND 675...COLUMBIA BASIN OF OREGON AND THE EASTERN COLUMBIA BASIN OF WASHINGTON: TODAY... WEATHER...MOSTLY CLOUDY. MAX TEMP...65-73 RIDGES...73-80 VALLEYS. 24 HR TREND...DOWN 6-9. MIN RH...29-37 PCT. 24 HR TREND...UP 15-20 PCT. 20 FT WIND...W-NW 6-12 MPH...WITH GUSTS 15-20 MPH WITH HIGHER GUSTS IN THE EASTERN COLUMBIA GORGE. RIDGE TOP WIND...W-NW 8-15 WITH GUSTS TO NEAR 25 MPH THIS AFTERNOON CWR...0 PCT. LAL...1. HAINES...4 (LOW). TONIGHT... WEATHER...PARTLY CLOUDY. ISOLATED SHOWERS OR A THUNDERSTORM NEAR THE BLUE MOUNTAINS THIS EVENING. MIN TEMP...48-58. 24 HR TREND...LITTLE CHANGE. MAX RH...65-75 PCT. 24 TREND...LITTLE CHANGE. 20 FOOT WIND...SW-W 3-7 MPH...EXCEPT 10-15 MPH WITH GUSTS TO 20 MPH EASTERN COLUMBIA GORGE. RIDGE TOP WIND...EVENING W-NW 6-12 MPH WITH GUSTS TO 20 MPH. CWR...0 PCT. LAL...1-2. HAINES...4 (LOW). WEDNESDAY... WEATHER...PARTLY CLOUDY. A SLIGHT CHANCE OF MAINLY AFTERNOON SHOWERS. MAX TEMP...65-73 RIDGES...73-80 VALLEYS. 24 HR TREND...DOWN 2-5. MIN RH...31-39 PCT. 24 HR TREND...UP 2-3 PCT. 20 FT WIND...SW-W 5-10 MPH...EXCEPT 10-15 MPH WITH GUSTS TO 25 MPH IN THE EASTERN COLUMBIA GORGE. RIDGE TOP WIND...W-NW 8-13 MPH. CWR...0 PCT. LAL...1. HAINES...4 (LOW). ZONE 681...YAKAMA ALPINE DISTRICT: TODAY... WEATHER...MOSTLY CLOUDY. MAX TEMP...55-65 RIDGES...65-75 VALLEYS. 24 HR TREND...DOWN 4-6. MIN RH...43-50 RIDGES...37-43 VALLEYS. 24 HR TREND...UP 12-18 PCT. 20 FT WIND...W-NW 5-10 MPH. RIDGE TOP WIND...W-NW 6-12 MPH. CWR...10 PCT. LAL...1. HAINES...3 (VERY LOW). TONIGHT... WEATHER...MOSTLY CLOUDY. MIN TEMP...38-43 RIDGES...43-48 VALLEYS. 24 HR TREND...DOWN 2-3. MAX RH...65-75 PCT RIDGES...75-85 PCT VALLEYS. 24 TREND...LITTLE CHANGE. 20 FOOT WIND...W-NW 5-10 MPH WITH EVENING GUSTS TO 20 MPH...DECREASING TO 4-8 MPH AFTER MIDNIGHT. RIDGE TOP WIND...NW-N 7-12 MPH WITH EVENING GUSTS TO 25 MPH...DECREASING TO 5-10 MPH LATE. CWR...0 PCT. LAL...1. HAINES...3 (VERY LOW). WEDNESDAY... WEATHER...PARTLY CLOUDY. MAX TEMP...55-65 RIDGES...65-75 VALLEYS. VALLEYS. 24 HR TREND...LITTLE CHANGE. MIN RH...43-50 RIDGES...37-43 VALLEYS. 24 HR TREND...LITTLE CHANGE. 20 FT WIND...W-NW 3-7 MPH WITH GUSTS TO 15 MPH. RIDGE TOP WIND...N 6-12 MPH WITH GUSTS TO 20 MPH. CWR...0 PCT. LAL...1. HAINES...3 (VERY LOW). EXTENDED FORECAST...THURSDAY THROUGH SATURDAY... THURSDAY...PARTLY CLOUDY. ISOLATED SHOWERS OR THUNDERSTORMS. LOWS 35-45 MOUNTAINS...EXCEPT 50-55 BASIN. HIGHS 70-80 MOUNTAINS AND 80-90 VALLEYS/BASIN. FRIDAY...PARTLY CLOUDY. A SLIGHT CHANCE OF SHOWERS OR THUNDERSTORMS OVER THE MOUNTAINS. LOWS 40-50...EXCEPT 55-60 BASIN. HIGHS 70-80 MOUNTAINS AND 80-90 VALLEYS/BASIN. SATURDAY...PARTLY CLOUDY WITH ISOLATED SHOWERS OR THUNDERSTORMS. LOWS 40-50...EXCEPT 55-60 BASIN. HIGHS 70-80 MOUNTAINS AND 80-90 VALLEYS/BASIN. WIND OUTLOOK: THURSDAY...NW-NE 5-10 MPH. FRIDAY...SW-NW 5-10 MPH. SATURDAY...E 5-10 MPH. 6-10 DAY OUTLOOK...SUNDAY AUG 25 - THURSDAY AUG 29 2002... NEAR NORMAL TEMPERATURES AND NEAR NORMAL PRECIPITATION THROUGH THE PERIOD. FIRE WEATHER PROBABILITY FORECAST FOR ZONE 632 THIS IS AN EXPERIMENTAL FIVE DAY PROBABILITY FORECAST OF SELECTED WEATHER PARAMETERS IN TENS OF PERCENT. THIS DATA DOES NOT APPLY TO AND SHOULD NOT BE USED FOR ANY ZONE...OTHER THAN OREGON ZONE 632. ISSUED...MON AUG 19 2002...VALID BEGINNING TUE AUG 20 2002. ZONE PRECIP RH WIND LIGHTNING 632 11010 33434 43111 22112 1. CHANCE OF 0.10 OR MORE PRECIP OVER HALF OR MORE OF THE ZONE. 2. CHANCE OF RH LESS THAN 15% OCCURRING OVER HALF OR MORE OF THE ZONE. 3. CHANCE OF SUSTAINED SURFACE WINDS OF 14 MPH OR GREATER OVER HALF OR MORE OF THE ZONE FOR AT LEAST ONE HOUR. 4. CHANCE OF RECEIVING ONE OR MORE LIGHTNING STRIKES IN THE ZONE.