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2
FPCN39 CWLW 191534
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 PST THURSDAY 19 DECEMBER 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 11 -5 200 3 51 -1 1200 5
KAMLOOPS KEL 13 -6 500 3 41 -3 1100 5
OKANAGAN KEL 22 -4 700 4 41 -3 1100 5
CASTLEGAR SPOK 18 -6 800 3 20 -4 850 3
CRANBROOK SPOK 12 -11 950 6 29 -8 950 6
REVELSTOKE KEL 10 -8 450 3 11 -6 500 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 THURSDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PENTICTON SW 9 W 26 W 61
CRANBROOK W 15 W 54
TODAY'S VENTING: FAIR SOUTHWEST. POOR SOUTHEAST.
VENTING FOR FRIDAY: FAIR
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 -6 950 28 28 -5 950 28
PR. GEORGE P.G. 12 -4 700 1 31 -3 900 10
SMITHERS P.G. 11 -5 500 1 26 -5 500 1
WELLS GRAY P.G. 11 -3 1000 28 11 -3 1000 28
FT NLSN F.N. 31 -12 700 8 31 -12 700 8
FT STJOHN F.N. 32 -2 900 12 31 -3 900 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 THURSDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PR. GEORGE W 43 W 50
SMITHERS W 48 W 50
TODAY'S VENTING: POOR.
VENTING FOR FRIDAY: POOR.
COAST
UPPER ***** MORNING ****** ***** AFTERNOON ****
AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd
(mASL) (kt) (mASL) (kt)
VANCOUVER QUIL 12 1 100 8 17 5 200 8
FRASER VLY QUIL 13 0 50 8 17 4 150 8
SRN VRISL QUIL 13 3 150 4 20 7 200 6
CNTRL VRISL QUIL 11 1 100 4 13 3 150 4
NRN VRISL HRDY 41 5 350 11 51 7 500 11
TERRACE ANT 10 -2 200 29 18 0 200 29
STEWART ANT 10 2 0 12 17 0 0 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 THURSDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
VANCOUVER S 24 W 54 W 69
PORT HARDY W 39 W 43 W 56
SANDSPIT W 48 W 44 W 44
TODAY'S VENTING: POOR.
VENTING FOR FRIDAY: POOR.
VENTILATION GUIDELINES:
0-33.....POOR
34-54.....FAIR
55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.
END/MWSO
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