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If you are not a subscriber yet, enter basic when asked to login. 2 FPCN39 CWLW 061443 SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF ENVIRONMENT CANADA AT 8:00 AM PDT THURSDAY 6 JUNE 1996 FOR TODAY. VENTILATION INDICES (TEMPERATURE) AND MIXING HEIGHTS. MIXING HEIGHTS IN METRES ABOVE SEA LEVEL. AVERAGE WINDS IN KNOTS. SPOT INDICES ARE DETERMINED BY THE ASPECT AND ELEVATION OF THE SITES. COMPARE WINDS, TEMPERATURES AND ELEVATION WITH THE SITES HERE TO DETERMINE THE INDEX IN ANY OTHER AREA. SOUTHERN INTERIOR UPPER ***** MORNING ****** ***** AFTERNOON **** AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd (mASL) (kt) (mASL) (kt) FRSR CANYN KEL 29 21 1100 2 100 28 2650 12 KAMLOOPS KEL 27 20 1200 2 100 27 3350 13 OKANAGAN KEL 25 19 1050 2 100 28 3350 13 CASTLEGAR GEG 44 19 950 9 100 29 3500 11 CRANBROOK GEG 67 17 1550 13 100 26 3950 12 REVELSTOKE KEL 17 16 900 2 100 24 2350 11 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PENTICTON S 9 SW 19 SW 33 CRANBROOK SW 11 SW 28 INVERSION HT BREAKTHRU TEMP KELOWNA 1410 m 22 C SPOKANE 1070 m 19 C TODAY'S VENTING: VENTING WILL START OUT POOR TODAY UNDER A CLOUD SHEILD ASSOCIATED WITH WARM AIR ALOFT. AN UPPER COLD FRONT MOVING RAPIDLY ACCROS THE REAGIONS TODAY WILL CLEAR THE SKIES ALLOWING SURFACE TEMPERATURES TO RISE SHARPLY AND BRINGING IN COLDER AIR ALOFT. THE RESULT WILL BE MUCH IMPROVED VENTING LATER THIS AFTERNOON. VENTING FOR FRIDAY: GOOD VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD CENTRAL INTERIOR/NORTHEAST UPPER ***** MORNING ****** ***** AFTERNOON **** AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd (mASL) (kt) (mASL) (kt) WILLIAMS L P.G. 100 16 2600 37 100 20 3950 35 PR. GEORGE P.G. 31 14 850 13 100 18 2400 30 SMITHERS ANN 100 13 1950 37 100 18 2850 35 WELLS GRAY P.G. 100 15 2450 37 100 21 4000 35 FT NLSN F.N. 50 12 835 10 100 16 2400 25 FT STJOHN F.N. 40 10 400 14 100 18 2400 30 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PR. GEORGE SW 30 SW 43 SMITHERS SW 30 SW 43 INVERSION HT BREAKTHRU TEMP PR. GEORGE 1050 m 16 C FT. NELSON MISSING TODAY'S VENTING: VENTING WILL START OUT POOR TODAY UNDER A CLOUD SHEILD ASSOCIATED WITH WARM AIR ALOFT. AN UPPER COLD FRONT MOVING RAPIDLY ACCROS THE REAGIONS TODAY WILL CLEAR THE SKIES ALLOWING SURFACE TEMPERATURES TO RISE SHARPLY AND BRINGING IN COLDER AIR ALOFT. THE RESULT WILL BE MUCH IMPROVED VENTING LATER THIS AFTERNOON. VENTING FOR FRIDAY: GOOD VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD COAST UPPER ***** MORNING ****** ***** AFTERNOON **** AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd (mASL) (kt) (mASL) (kt) VANCOUVER QUIL 40 17 300 17 73 19 600 17 FRASER VLY QUIL 9 18 400 0 100 23 1350 13 SRN VRISL QUIL 9 16 200 0 55 20 700 9 CNTRL VRISL QUIL 21 15 200 0 65 19 1250 7 NRN VRISL HRDY 23 13 350 4 97 16 1450 11 TERRACE ANN 100 13 1350 38 100 16 1950 36 STEWART ANN 100 13 800 29 100 16 1550 33 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m VANCOUVER SW 15 SW 24 SW 46 PORT HARDY S 30 S 41 SW 50 SANDSPIT S 50 S 52 S 54 INVERSION HT BREAKTHRU TEMP QUILLAYUTE 305 m 17 C PORT HARDY 360 m 13 C ANNETTE 140 m 11 C TODAY'S VENTING: VENTING WILL START OUT POOR OVER THE SOUTH TODAY UNDER A CLOUD SHEILD ASSOCIATED WITH WARM AIR ALOFT. AN UPPER COLD FRONT HAS ALREADY CROSSED THE NORTH AND WILL MOVE RAPIDLY SOUTHEASTWARD CLEARING SKIES AND BRINGING IN COLDER AIR ALOFT. THE RESULT WILL BE MUCH IMPROVED VENTING THIS AFTERNOON. VENTING FOR FRIDAY: GOOD VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD VENTILATION GUIDELINES: 0-33.....POOR 34-54.....FAIR 55-100.....GOOD. VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET. 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