FPCN39 CWLW 271349 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 WEDNESDAY 27 MAY 1998 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 13 200 8 96 18 1300 14 KAMLOOPS KEL 82 15 1150 14 96 19 1550 13 OKANAGAN KEL 76 14 1050 14 96 18 1450 14 CASTLEGAR SPOK 76 14 1050 14 96 18 1450 14 CRANBROOK SPOK 76 14 1050 14 96 18 1450 14 REVELSTOKE KEL 92 18 1550 13 100 22 2350 12 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PENTICTON SW 9 VR 5 NE 13 CRANBROOK VR 5 VR 5 INVERSION HT BREAKTHRU TEMP KELOWNA 600 m 12 C SPOKANE NONE TODAY'S VENTING: GOOD VENTING FOR THURSDAY: GOOD VENTING OUTLOOK FRIDAY THRU SUNDAY: 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. 10 16 950 28 100 22 2550 25 PR. GEORGE P.G. 46 19 1000 15 100 23 2250 24 SMITHERS P.G. 9 16 500 4 100 23 1500 18 WELLS GRAY P.G. 10 16 1000 28 100 22 2550 25 FT NLSN F.N. 9 18 400 6 35 24 1100 4 FT STJOHN F.N. 9 18 700 6 72 25 3700 3 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PR. GEORGE NE 24 E 19 SMITHERS E 19 SE 19 INVERSION HT BREAKTHRU TEMP PR. GEORGE 1200 m 21 C FT. NELSON 700 m 22 C TODAY'S VENTING: GOOD VENTING FOR THURSDAY: GOOD VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD COAST UPPER ***** MORNING ****** ***** AFTERNOON **** AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd (mASL) (kt) (mASL) (kt) VANCOUVER QUIL 62 11 550 15 100 13 1300 16 FRASER VLY QUIL 25 10 150 15 100 13 1200 15 SRN VRISL QUIL 61 12 650 11 100 14 1450 15 CNTRL VRISL QUIL 89 13 1100 13 100 16 1850 16 NRN VRISL HRDY 54 12 700 8 70 14 1150 8 TERRACE ANT 9 15 200 13 9 19 200 13 STEWART ANT 10 14 100 1 11 19 200 1 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m VANCOUVER SW 26 SW 17 E 19 PORT HARDY S 24 E 31 E 44 SANDSPIT NE 19 E 17 E 15 INVERSION HT BREAKTHRU TEMP QUILLAYUTE NONE PORT HARDY NONE ANNETTE NONE TODAY'S VENTING: GOOD VENTING FOR THURSDAY: GOOD VENTING OUTLOOK FRIDAY THRU SUNDAY: GOOD VENTILATION GUIDELINES: 0-33.....POOR 34-54.....FAIR 55-100.....GOOD. VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET. END/