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If you are not a subscriber yet, enter basic when asked to login. 2 FPCN39 CWLW 031441 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 3 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 28 8 650 4 100 13 2650 8 KAMLOOPS KEL 38 7 900 6 100 14 3350 8 OKANAGAN KEL 12 5 600 1 100 14 3350 8 CASTLEGAR GEG 36 7 1000 6 96 12 3500 5 CRANBROOK GEG 25 4 1100 9 93 9 3950 5 REVELSTOKE KEL 32 6 850 6 97 9 2400 8 *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 VR 5 VR 5 N 11 CRANBROOK VR 5 VR 5 INVERSION HT BREAKTHRU TEMP KELOWNA 695 m 5 C SPOKANE 1120 m 7 C TODAY'S VENTING: MORNING INVERSION GIVING POOR VENTING THEN GOOD VENTING ONCE IT BREAKS DOWN. BREAKDOWN TIME LIKELY CLOSE TO 11 A.M. VENTING FOR SATURDAY: GOOD VENTING OUTLOOK SUNDAY THRU TUESDAY: PATTERN SHOWS UPPER TROUGH OVER AREA WITH VERY COLD AIR FOR THIS TIME OF YEAR FEEDING DOWN FOR NORTH. LOOKS LIKE COLD NIGHTS ESPECIALLY IF SKIES ARE CLEAR OVERNIGHT WITH STRONG SURFACE INVERSIONS GIVING POOR VENTING. DEPTH OF THE INVERSION PROBABLY ONLY A FEW HUNDRED METRES ABOVE GOUND SO SHOULD BREAK DOWN TOWARDS LATE MORNING THEN GOOD VENTING EACH AFTERNOON. 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 4 950 6 100 8 2650 17 PR. GEORGE P.G. 54 7 1250 8 100 11 2850 16 SMITHERS ANN 9 4 500 11 94 10 1950 11 WELLS GRAY P.G. 100 7 2500 17 100 11 4000 16 FT NLSN F.N. 22 5 450 8 23 7 700 5 FT STJOHN F.N. 9 4 700 9 100 7 3700 8 *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 NE 22 NE 15 SMITHERS N 9 N 15 INVERSION HT BREAKTHRU TEMP PR. GEORGE NIL NIL FT. NELSON 762 m 9 C TODAY'S VENTING: IN THE CENTRAL INTERIOR POOR VENTING IN MORNING DUE TO NEAR ISOTHERMAL LAPSE RATE AND LIGHT WINDS. EXCEPTION IS WELLS GRAY AREA BECAUSE OF IT ELEVATION. GOOD VENTING IN THE AFTERNOON BUT ONLY NEAR PEAK HEATING TIME. IN THE NORTHEAST VENTING WILL BE POOR DUE TO SURFACE INVERSION. DSYTIME HEATING NOT EXPECTED TO BREAK IT. VENTING FOR SATURDAY: GOOD VENTING OUTLOOK SUNDAY THRU TUESDAY: PATTERN SHOWS UPPER TROUGH OVER SOUTHERN INTERIOR DRAWING A CONTINUED FEED OF COLD AIR FROM NORTH. EXPECT POOR VENTING TO CONTINUE OVER NORTHEAST. CENTRAL INTERIOR WILL BE POOR IN THE MORNING BECOMING GOOD IN THE LATE AFTERNOON. COAST UPPER ***** MORNING ****** ***** AFTERNOON **** AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd (mASL) (kt) (mASL) (kt) VANCOUVER QUIL 75 9 1450 7 93 12 2250 7 FRASER VLY QUIL 69 9 1400 6 89 12 2150 7 SRN VRISL QUIL 65 9 1250 6 89 12 2050 7 CNTRL VRISL QUIL 61 5 1200 9 89 12 2100 7 NRN VRISL HRDY 100 9 1150 10 100 11 1500 19 TERRACE ANN 10 8 250 10 100 14 2400 11 STEWART ANN 13 8 100 4 86 14 1400 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 W 17 W 11 VR 5 PORT HARDY NW 20 N 20 N 17 SANDSPIT NW 26 N 24 N 22 INVERSION HT BREAKTHRU TEMP QUILLAYUTE 300 m 6 C PORT HARDY NONE N/A ANNETTE 170 m 8 C TODAY'S VENTING: GOOD IN THE SOUTH. POOR IN THE MORNING IN THE NORTH BUT GOOD IN THE AFTERNOON. VENTING FOR SATURDAY: GOOD VENTING OUTLOOK SUNDAY THRU TUESDAY: UPPER TROUGH OVER THE SOUTHERN PART OF THE PROVINCE WILL CONTINUE TO DRAW COLD AIR FROM THE NORTH. SOUTH COAST SHOULD REMAIN GOOD. THE NORTH COAST WILL BE POOR IN THE MORNING BECOMING GOOD IN THE AFTERNOON. VENTILATION GUIDELINES: 0-33.....POOR 34-54.....FAIR 55-100.....GOOD. VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET. END/JEM -------------------------------------------------- Special Industry Related Information -------------------------------------------------- 1 - Smoke Forecast, Coast 2 - Smoke Forecast, Interior Q - Return to Previous menu -------------------------------------------------- l Previous usage time: 20:05:41 This session: 00:01:24 --------Total Usage time: 20:07:05 Today's usage time: 00:05:34 This month's usage time: 00:20:40 ----This account expires: 12/31/96 NO CARRIER