FNUS75 KBOU 081829 FWSBOU SPOT FORECAST FOR GLACIER BASIN RX...USFS NATIONAL WEATHER SERVICE DENVER CO 1229 PM MDT THU OCT 8 2009 IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER SERVICE. .DISCUSSION...COLD...UPSLOPE CONDITIONS WILL CONTINUE THROUGH TONIGHT WITH PERIODS OF LIGHT SNOW...FOG AND FREEZING DRIZZLE. THE COLD AIRMASS WILL RECEDE ON FRIDAY AS MODERATE WEST TO NORTHWEST FLOW ALOFT BRINGS DRIER AND MILDER AIR INTO THE REGION. ANOTHER STRONG COLD FRONT IS EXPECTED TO MOVE INTO THE AREA FRIDAY NIGHT WITH MORE SUB-FREEZING TEMPERATURES...FREEZING DRIZZLE OR LIGHT SNOW THROUGH THE DAY ON SATURDAY. TEMPERATURES WILL MODERATE AGAIN ON SUNDAY THEN WARM THROUGH THE FIRST PART OF NEXT WEEK AS A STRONG UPPER RIDGE BUILDS OVER THE WESTERN U.S. AND COLORADO COMES UNDER DRY NORTHWESTERLY FLOW. ...THUNDERSTORMS IMPLY STRONG...GUSTY AND ERRATIC WINDS... .REST OF TODAY... SKY/WEATHER.........CLOUDY. AREAS OF FOG AND LIGHT SNOW LIKELY. MAX TEMPERATURE.....28-34. MIN HUMIDITY........80-90%. 20-FOOT WINDS.......UPSLOPE/UPVALLEY 4-10 MPH. TRANSPORT WINDS.....WEST 16-24 MPH. MIXING HEIGHT.......5000-5500 FT AGL. SMOKE DISPERSAL.....VERY GOOD. HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .TONIGHT... SKY/WEATHER.........MOSTLY CLOUDY. SNOW LIKELY UNTIL 2100...THEN CHANCE OF SNOW UNTIL 0200...THEN ISOLATED SNOW SHOWERS. MIN TEMPERATURE.....16-24. MAX HUMIDITY........100%. 20-FOOT WINDS.......DOWNSLOPE/DOWNVALLEY 2-8 MPH UNTIL 2100...THEN WEST 11-17 MPH. TRANSPORT WINDS.....WEST 25-32 MPH. MIXING HEIGHT.......4000-5000 FT AGL UNTIL 2200. 500-1000 FT AGL AFTER 0100. SMOKE DISPERSAL.....VERY GOOD UNTIL 2200. POOR AFTER 2400. HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .FRIDAY... SKY/WEATHER.........MOSTLY CLOUDY. ISOLATED SNOW SHOWERS UNTIL 1300...THEN SLIGHT CHANCE OF RAIN AND SNOW. MAX TEMPERATURE.....38-46. MIN HUMIDITY........50-60%. 20-FOOT WINDS.......BREEZY. WEST 15-25 MPH WITH GUSTS TO AROUND 35 MPH. TRANSPORT WINDS.....WEST 32-52 MPH. MIXING HEIGHT.......4500-5500 FT AGL. SMOKE DISPERSAL.....POOR UNTIL 0900. EXCELLENT AFTER 1200. HAINES INDEX........2 OR VERY LOW POTENTIAL FOR LARGE PLUME DOMINATED FIRE GROWTH. .FORECAST DAYS 3 THROUGH 5... .SATURDAY...SNOW LIKELY UNTIL 0600...THEN CHANCE OF SNOW. LOWS AROUND 18. HIGHS IN THE LOWER 30S. TYPICAL SLOPE/VALLEY WINDS LESS THAN 10 MPH. .SUNDAY...CLOUDY. CHANCE OF SNOW UNTIL 1800. CHANCE OF RAIN AFTER 1200 UNTIL 1800...THEN SLIGHT CHANCE OF SNOW. LOWS AROUND 17. HIGHS IN THE LOWER 40S. WEST WINDS AROUND 9 MPH. .COLUMBUS DAY...PARTLY CLOUDY. SLIGHT CHANCE OF SNOW UNTIL 0600. LOWS IN THE LOWER 20S. HIGHS IN THE LOWER 40S. TYPICAL SLOPE/VALLEY WINDS LESS THAN 10 MPH. EXPERIMENTAL FIRE WEATHER TABLE FOR GLACIER BASIN RX. +++ DATA IN THE FOLLOWING TABLE HAS BEEN SAMPLED DIRECTLY FROM THE DIGITAL DATABASE. VALUES IN THE TABLE MAY NOT AGREE WITH INFORMATION IN THE NARRATIVE FORECAST. INFORMATION CONTAINED IN THIS TABLE SHOULD NOT BE CONSIDERED AN OFFICIAL FORECAST. PLEASE PROVIDE FEEDBACK IF THE INFORMATION IN THIS TABLE HAS BEEN REPRESENTATIVE AND/OR USEFUL. +++ FORECAST SC PP TF RH 20FT G H L 10K MIXG TRAN VENTL AJTV VALID AT % % F % WIND S I A WIND HGT WIND RATE RATNG MPH T L MPH AGL MPH KT-FT 10/08-12 96 71 34 71 NE 2 2 2 1 W33 5144 W 17 78755 G 10/08-13 96 71 34 70 N 2 1 5241 W 20 89940 G 10/08-14 96 71 34 69 NW 2 1 5339 W 22 101126 V 10/08-15 96 71 34 69 W 2 2 2 1 W45 5436 W 24 112311 V 10/08-16 96 71 34 69 W 3 1 5354 W 25 115366 V 10/08-17 96 71 33 71 W 3 1 5272 W 25 118421 V 10/08-18 89 66 32 74 W 5 5 2 1 W47 5190 W 26 121476 V 10/08-19 89 66 29 80 W 5 1 4779 W 28 113321 V 10/08-20 89 66 27 85 W 6 1 4368 W 28 105165 V 10/08-21 89 10 26 86 W 6 6 2 1 W45 3958 W 29 97009 G 10/08-22 89 10 25 87 W 7 1 3300 W 28 79576 G 10/08-23 85 10 25 87 W 8 1 2643 W 26 62142 G 10/09-00 85 10 24 87 W 9 9 2 1 W48 1986 W 26 44708 F 10/09-01 85 10 23 94 W 10 1 1691 W 28 39494 P 10/09-02 63 10 22 96 W 13 1 1396 W 29 34281 P 10/09-03 63 10 22 97 W 14 22 2 1 W60 1101 W 30 29067 P 10/09-04 63 10 21 99 W 15 1 954 W 31 25604 P 10/09-05 63 10 21 100 W 15 1 807 W 32 22140 P 10/09-06 60 10 21 100 W 16 25 2 1 W76 660 W 32 18677 P 10/09-07 60 10 22 99 W 18 1 1432 W 39 56605 F 10/09-08 60 10 26 86 W 21 1 2203 W 45 94534 G 10/09-09 60 10 31 72 W 23 37 2 1 W78 2975 W 52 132463 V 10/09-10 60 10 35 61 W 23 1 3704 W 52 165025 E 10/09-11 60 10 37 58 W 23 1 4433 W 52 197587 E 10/09-12 60 10 39 55 W 23 37 2 1 W77 5161 W 52 230150 E 10/09-13 60 20 40 55 W 22 1 5355 W 48 223302 E 10/09-14 60 20 40 55 W 20 1 5549 W 45 216455 E 10/09-15 69 20 41 55 W 18 30 2 1 W75 5743 W 41 209607 E 10/09-16 69 20 40 58 W 17 1 5586 W 41 202787 E 10/09-17 69 20 39 61 W 16 1 5428 W 41 195967 E 10/09-18 69 23 37 65 W 15 15 2 1 W81 5270 W 41 189146 E 10/09-19 69 23 33 75 W 14 1 3841 W 37 133957 V 10/09-20 81 23 30 84 W 14 1 2412 W 32 78768 G 10/09-21 81 42 28 86 W 13 13 2 1 W81 982 W 28 23579 P 10/09-22 81 42 26 89 W 10 1 852 W 23 18138 P 10/09-23 81 42 25 90 W 8 1 722 W 18 12698 P 10/10-00 81 70 24 92 W 6 6 2 1 W68 591 W 14 7257 P 10/10-01 81 70 23 94 W 6 1 806 W 15 10997 P 10/10-02 81 70 22 97 SW 5 1 1021 W 16 14737 P 10/10-03 81 70 21 100 SW 5 5 2 1 W78 1235 W 17 18477 P 10/10-04 81 70 20 100 W 5 1 1398 W 18 22811 P 10/10-05 81 70 20 100 W 6 1 1560 W 20 27145 P 10/10-06 90 48 19 89 W 6 6 2 1 W84 1723 W 21 31479 P 10/10-07 90 48 21 88 W 6 1 2633 W 28 73567 G 10/10-08 90 48 22 86 W 6 1 3544 W 35 115656 V 10/10-09 90 48 25 76 W 6 6 2 1 W92 4454 W 40 157744 E 10/10-10 90 48 28 71 W 7 1 4563 W 43 168358 E 10/10-11 90 48 29 70 W 8 1 4671 W 44 178972 E 10/10-12 90 48 30 71 W 9 9 3 1 W87 4780 W 46 189586 E 10/10-13 90 48 31 70 W 9 1 4669 W 44 179112 E 10/10-14 90 48 31 71 W 10 1 4559 W 43 168637 E 10/10-15 90 48 31 71 W 10 10 3 1 W79 4448 W 41 158162 E 10/10-16 90 48 31 72 W 9 1 4110 W 39 140261 V 10/10-17 90 48 30 75 W 9 1 3771 W 37 122359 V 10/10-18 97 30 29 77 W 8 8 3 1 W73 3432 W 35 104458 V 10/10-19 97 30 26 84 W 7 1 2548 W 30 73925 G 10/10-20 97 30 24 87 W 7 1 1663 W 24 43393 F 10/10-21 97 30 23 87 SW 6 6 2 1 W70 778 W 20 12860 P 10/10-22 97 30 22 88 W 7 1 592 W 17 9397 P 10/10-23 97 30 21 87 W 7 1 405 W 15 5934 P 10/11-00 89 30 20 88 W 8 8 2 1 W67 219 W 13 2471 P 10/11-01 89 30 20 88 W 8 1 209 W 14 2418 P 10/11-02 89 30 19 88 W 9 1 200 W 14 2364 P 10/11-03 89 30 18 88 W 9 9 2 1 W74 191 W 14 2311 P 10/11-04 89 30 18 89 W 10 1 195 W 15 2573 P 10/11-05 89 30 18 89 W 12 1 199 W 16 2834 P 10/11-06 77 28 17 89 W 13 13 2 1 W75 204 W 17 3096 P 10/11-07 77 28 18 100 W 12 1 10/11-08 77 28 23 87 W 10 1 10/11-09 77 28 29 69 W 10 10 1 10/11-10 77 28 34 57 W 9 1 10/11-11 77 28 36 52 W 8 1 10/11-12 75 28 38 48 W 7 7 1 10/11-13 75 28 39 46 W 7 1 10/11-14 75 28 39 45 W 7 1 10/11-15 75 28 40 43 W 7 7 1 10/11-16 75 28 39 44 W 7 1 10/11-17 75 28 38 46 W 7 1 10/11-18 85 20 37 48 W 7 7 1 KEY: FORECAST - MONTH/DAY-HOUR OF FORECAST /24-HOUR CLOCK LOCAL TIME/ VALID AT SC - SKY COVER /PERCENT/ PP - PROBABILITY OF PRECIPITATION /PERCENT/ TF - TEMPERATURE /DEGREES F/ RH - RELATIVE HUMIDITY /PERCENT/ 20FT WIND - 20-FOOT WIND /MPH/ GST - 20-FOOT WIND GUST /MPH/ HI - HAINES INDEX LAL - LIGHTNING ACTIVITY LEVEL 10K WIND - 10000 FEET ABOVE GROUND LEVEL FREE-AIR WINDS /MPH/ MIXG HGT - MIXING HEIGHT /FEET ABOVE GROUND LEVEL/ TRAN WIND - TRANSPORT WINDS /MPH/ VENTL RATE - VENTILATION RATE /KNOT-FEET/ AJTV RATNG - SMOKE DISPERSION ADJECTIVE RATING P - POOR F - FAIR G - GOOD V - VERY GOOD E - EXCELLENT $$ DANKERS...WFO BOULDER REQUESTED BY...DOUG WATRY REASON FOR REQUEST...PRESCRIBED .TAG 20091008.GLACI.01/BOU