FPCN39 CWLW 201400 SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF ENVIRONMENT CANADA AT 7:00 AM PDT TUESDAY 20 APRIL 1999 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 9 11 550 0 100 15 2500 11 KAMLOOPS KEL 12 10 650 1 100 16 3350 12 OKANAGAN KEL 9 8 550 0 100 14 2700 11 CASTLEGAR SPOK 52 10 950 12 100 15 3500 17 CRANBROOK SPOK 100 10 3950 20 100 14 3950 20 REVELSTOKE KEL 11 9 650 1 100 12 2450 10 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PENTICTON W 11 NW 20 NW 24 CRANBROOK NW 11 NW 28 TODAY'S VENTING: GOOD BY AFTERNOON. VENTING FOR WEDNESDAY: FAIR TO 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 7 2150 19 100 12 3950 16 PR. GEORGE P.G. 100 8 1850 19 100 12 2700 16 SMITHERS P.G. 77 7 1250 14 100 10 1900 16 WELLS GRAY P.G. ## ## ### ## 100 12 4000 16 FT NLSN F.N. 9 9 650 0 94 16 1700 12 FT STJOHN F.N. 9 8 700 19 91 13 1750 14 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PR. GEORGE NW 17 NW 11 SMITHERS W 13 VR 11 TODAY'S VENTING: GOOD BY AFTERNOON. VENTING FOR WEDNESDAY: FAIR TO GOOD COAST UPPER ***** MORNING ****** ***** AFTERNOON **** AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd (mASL) (kt) (mASL) (kt) VANCOUVER QUIL 100 8 1150 18 100 12 2300 19 FRASER VLY QUIL 100 9 1500 19 100 12 2250 19 SRN VRISL QUIL 100 9 1400 16 100 12 2100 17 CNTRL VRISL QUIL 100 9 1500 16 100 12 2150 17 NRN VRISL HRDY 51 7 500 11 100 10 1750 10 TERRACE ANT 100 8 1600 13 100 11 2350 14 STEWART ANT 76 8 900 11 100 11 1650 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 TUESDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m VANCOUVER W 20 W 19 NW 11 PORT HARDY NW 17 NW 11 VR 5 SANDSPIT SW 9 W 9 S 9 TODAY'S VENTING: GOOD. VENTING FOR WEDNESDAY: FAIR VENTILATION GUIDELINES: 0-33.....POOR 34-54.....FAIR 55-100.....GOOD. VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET. END/TCS $$$$^^