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If you are not a subscriber yet, enter basic when asked to login. 2 FPCN39 CWLW 311434 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 FRIDAY 31 MAY 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 60 16 1200 7 100 21 2500 13 KAMLOOPS KEL 45 14 1000 7 100 20 2650 13 OKANAGAN KEL 76 15 1550 8 100 20 2600 13 CASTLEGAR GEG 49 11 900 12 100 16 1750 17 CRANBROOK GEG 55 10 1200 22 100 14 2200 20 REVELSTOKE KEL 9 10 450 1 80 13 1700 7 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PENTICTON W 9 W 19 W 24 CRANBROOK W 17 W 43 INVERSION HT BREAKTHRU TEMP KELOWNA 650 m 13 C SPOKANE 1000 m 13 C TODAY'S VENTING: AN UNSTABLE AIRMASS REMAINS OVER THE PROVINCE. AS A RESULT VENTING WILL BECOME GOOD BY LATE MORNING. VENTING FOR SATURDAY: GOOD. VENTING OUTLOOK SUNDAY THRU TUESDAY: VENTING WILL BECOME GENERALLY FAIR DURING THIS PERIOD AS THE AIRMASS STABILIZES DUE TO A RIDGE OF HIGH PRESSURE. THE VENTING MAY BE GOOD FOR A SHORT PERIOD DURING THE AFTERNOONS JUST BECAUSE OF DAYTIME HEATING. 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. 68 12 1650 12 100 17 3950 9 PR. GEORGE P.G. 67 13 1400 11 99 17 2500 9 SMITHERS ANN 88 15 2050 9 100 22 3500 10 WELLS GRAY P.G. 80 13 2150 10 100 18 4000 9 FT NLSN F.N. 9 10 400 0 68 21 3400 3 FT STJOHN F.N. 33 11 1000 10 45 14 1250 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 FRIDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PR. GEORGE N 17 N 19 SMITHERS VR 5 VR 19 INVERSION HT BREAKTHRU TEMP PR. GEORGE NONE m ## C FT. NELSON 1350 m 17 C TODAY'S VENTING: AN UNSTABLE AIRMASS WILL RESULT IN GOOD VENTING TODAY. HOWEVER THE BC PEACE WILL ONLY EXPERIENCE FAIR VENTING DUE TO A THICK CLOUD COVER. VENTING FOR SATURDAY: GOOD. VENTING OUTLOOK SUNDAY THRU TUESDAY: VENTING WILL BECOME GENERALLY FAIR DURING THIS PERIOD AS THE AIRMASS STABILIZES DUE TO A RIDGE OF HIGH PRESSURE. THE VENTING MAY BE GOOD FOR A SHORT PERIOD DURING THE AFTERNOONS JUST BECAUSE OF DAYTIME HEATING. COAST UPPER ***** MORNING ****** ***** AFTERNOON **** AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd (mASL) (kt) (mASL) (kt) VANCOUVER QUIL 75 13 1150 9 96 18 1600 10 FRASER VLY QUIL 73 14 1300 8 91 18 1600 9 SRN VRISL QUIL 23 11 250 6 91 18 1550 9 CNTRL VRISL QUIL 23 11 250 6 93 19 1650 9 NRN VRISL HRDY 39 11 600 6 77 15 1450 7 TERRACE ANN 80 16 1450 9 100 22 3200 10 STEWART ANN 76 15 1100 9 100 22 2300 9 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR FRIDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m VANCOUVER SW 15 W 11 SW 9 PORT HARDY S 13 S 19 S 20 SANDSPIT S 20 SE 30 SE 37 INVERSION HT BREAKTHRU TEMP QUILLAYUTE 250 m 11 C PORT HARDY 150 m 11 C ANNETTE NONE m ## C TODAY'S VENTING: THE AIRMASS WILL REMAIN UNSTABLE ENOUGH AT LOW LEVELS THAT THE VENTING WILL REMAIN GOOD TODAY. VENTING FOR SATURDAY: FAIR. VENTING OUTLOOK SUNDAY THRU TUESDAY: VENTING WILL REMAIN GENERALLY FAIR DUE TO A RIDGE OF HIGH PRESSURE. VENTILATION GUIDELINES: 0-33.....POOR 34-54.....FAIR 55-100.....GOOD. VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET. 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