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FPCN39 CWLW 251430
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 THURSDAY 25 JULY 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 19 27 1150 1 100 37 3200 9
KAMLOOPS KEL 19 26 1350 1 100 35 3350 9
OKANAGAN KEL 14 24 800 1 100 34 3350 9
CASTLEGAR GEG 23 24 800 5 100 34 3500 12
CRANBROOK GEG 9 23 950 12 100 33 3950 15
REVELSTOKE KEL 11 21 600 1 100 29 3450 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 THURSDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PENTICTON N 05 N 05 N 05
CRANBROOK N 05 N 05 N 05
INVERSION HT BREAKTHRU TEMP
KELOWNA 825 m 23 C
SPOKANE 1550 m 29 C
TODAY'S VENTING: FAIR THIS MORNING BECOMING GOOD MID AFTERNOON DUE
TO RELATIVELY HIGH TEMPERATURES AT THE TOP OF THE INVERSION.
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: 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. 75 20 2200 8 100 27 3950 9
PR. GEORGE P.G. 58 19 1250 11 100 27 3700 10
SMITHERS ANN 36 19 750 14 100 27 3500 6
WELLS GRAY P.G. 78 20 2350 8 100 28 4000 9
FT NLSN F.N. 9 10 400 0 80 26 2500 5
FT STJOHN F.N. 40 17 1350 5 70 22 2500 5
*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.
FORECAST UPPER WINDS FOR THURSDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PR. GEORGE NE 11 N 05
SMITHERS NE 03 NW 05 SW 05
INVERSION HT BREAKTHRU TEMP
PR. GEORGE 1550 m 23 C
FT. NELSON 650 m 18 C
TODAY'S VENTING: FAIR TO GOOD BECOMING GOOD MIDDAY.
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: FAIR TO GOOD.
COAST
UPPER ***** MORNING ****** ***** AFTERNOON ****
AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd
(mASL) (kt) (mASL) (kt)
VANCOUVER QUIL 29 20 300 9 40 25 450 9
FRASER VLY QUIL 9 23 350 0 52 32 1250 5
SRN VRISL QUIL 9 21 300 0 25 29 650 5
CNTRL VRISL QUIL 9 23 350 0 56 33 1350 5
NRN VRISL HRDY 20 14 250 5 55 19 650 9
TERRACE ANN 45 15 250 10 96 29 2450 7
STEWART ANN 36 19 250 12 94 29 1700 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 THURSDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
VANCOUVER NE 03 N 05 NW 11
PORT HARDY NW 28 NW 17 NW 09
SANDSPIT NW 24 NW 09 SW 11
INVERSION HT BREAKTHRU TEMP
QUILLAYUTE 900 m 30 C
PORT HARDY 1520 m 30 C
ANNETTE 1700 m 29 C
TODAY'S VENTING: FAIR TO GOOD DUE TO COOL LOW LEVEL TEMPERATURES AND
WARM TEMPERATURES AT INVERSION LEVEL.
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: FAIR
VENTILATION GUIDELINES:
0-33.....POOR
34-54.....FAIR
55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.
END/KAL
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