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If you are not a subscriber yet, enter basic when asked to login. 2 FPCN39 CWLW 221430 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 SATURDAY 22 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 42 19 1000 5 100 26 3200 6 KAMLOOPS KEL 54 19 1450 5 100 25 3350 6 OKANAGAN KEL 42 18 1150 5 100 25 3350 6 CASTLEGAR GEG 83 18 2000 8 100 25 3500 11 CRANBROOK GEG 75 14 2050 9 100 19 3950 13 REVELSTOKE KEL 38 17 1150 5 100 23 3450 6 *SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS. FORECAST UPPER WINDS FOR SATURDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PENTICTON VR 5 VR 5 NW 9 CRANBROOK VR 5 SE 17 INVERSION HT BREAKTHRU TEMP KELOWNA 760 m 14 C SPOKANE none m 12 C TODAY'S VENTING: Fair this morning under shallow inversion becoming good by mid-morning under daytime heating. Deep convection this afternoon. Frontal wave approaching from west tonight will keep venting in fair range western sections under noon Sunday. VENTING FOR SUNDAY: Fair to good. VENTING OUTLOOK MONDAY THRU WEDNESDAY: Little change in pattern. Airmass remains convectively unstable. Fair venting early morning improving to good by late morning with 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. 9 12 950 8 98 19 3950 6 PR. GEORGE P.G. 23 14 1000 5 97 21 3700 5 SMITHERS ANN 28 14 800 8 100 20 3500 7 WELLS GRAY P.G. 98 15 4000 6 98 22 4000 6 FT NLSN F.N. 13 13 500 3 100 19 2200 13 FT STJOHN F.N. 9 12 700 13 100 19 2350 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 SATURDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m PR. GEORGE NE 13 E 11 SMITHERS E 9 SE 11 INVERSION HT BREAKTHRU TEMP PR. GEORGE 1080 m 17 C FT. NELSON 1000 m 18 C TODAY'S VENTING: Poor this morning under shallow inversion becoming good near noon with strong surface heating. VENTING FOR SUNDAY: Fair to good. VENTING OUTLOOK MONDAY THRU WEDNESDAY: Little change in pattern. Poor venting early morning becoming good by midday with daytime heating. Convective airmass remains in place. COAST UPPER ***** MORNING ****** ***** AFTERNOON **** AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd (mASL) (kt) (mASL) (kt) VANCOUVER QUIL 66 16 1450 6 65 20 1550 5 FRASER VLY QUIL 64 17 1450 5 73 22 2000 5 SRN VRISL QUIL 56 15 1200 5 64 20 1500 5 CNTRL VRISL QUIL 65 17 1450 5 72 22 1900 5 NRN VRISL HRDY 38 13 800 4 44 16 900 5 TERRACE ANN 44 17 800 7 100 23 3200 7 STEWART ANN 32 17 450 6 100 23 3000 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 SATURDAY AFTERNOON (WINDS IN KM/H): 900m 1800m 2700m VANCOUVER SW 15 SW 11 SW 9 PORT HARDY SW 9 S 19 S 20 SANDSPIT VR 5 E 11 E 11 INVERSION HT BREAKTHRU TEMP QUILLAYUTE 140 m 12 C PORT HARDY 910 m 17 C ANNETTE 170 m 14 C TODAY'S VENTING: Good except only fair outer coasts due deep marine inversion. VENTING FOR SUNDAY: GOOD. VENTING OUTLOOK MONDAY THRU WEDNESDAY: Good diminishing to fair Wednesday under a weak surface ridge. VENTILATION GUIDELINES: 0-33.....POOR 34-54.....FAIR 55-100.....GOOD. VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET. 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