FPCN39 CWLW 131438
SMOKE CONTROL FORECAST FOR COASTAL BC AND THE INTERIOR INCLUDING THE
NORTHEAST ISSUED BY THE MOUNTAIN WEATHER SERVICE OFFICE OF
ENVIRONMENT CANADA AT 7:00 AM PST SUNDAY 13 DECEMBER 1998 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 9 7 200 2 30 9 600 12
KAMLOOPS KEL 44 12 1050 9 74 12 1350 9
OKANAGAN KEL 11 9 450 2 30 9 850 12
CASTLEGAR SPOK 9 3 500 8 9 5 500 8
CRANBROOK SPOK 9 4 950 34 9 5 950 14
REVELSTOKE KEL 9 5 450 2 9 6 450 2
*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.
FORECAST UPPER WINDS FOR SUNDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PENTICTON S 13 S 30 SW 69
CRANBROOK SW 22 SW 67
TODAY'S VENTING: POOR EXCEPT GOOD IN KAMLOOPS AREA BY LATE AFTERNOON.
VENTING FOR 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. 30 2 1100 10 54 2 1500 10
PR. GEORGE P.G. 30 1 800 10 54 2 1200 10
SMITHERS P.G. 9 -1 500 1 80 0 1500 8
WELLS GRAY P.G. 30 0 1300 10 54 1 1500 10
FT NLSN F.N. 9 -12 400 5 9 -8 400 5
FT STJOHN F.N. 9 2 700 10 9 2 700 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 SUNDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PR. GEORGE NW 19 W 19
SMITHERS W 30 W 19
TODAY'S VENTING: POOR TO FAIR EXCEPT GOOD THIS AFTERNOON IN THE
NORTHWEST.
VENTING FOR MONDAY: FAIR.
COAST
UPPER ***** MORNING ****** ***** AFTERNOON ****
AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd
(mASL) (kt) (mASL) (kt)
VANCOUVER QUIL 11 10 100 27 100 10 1100 27
FRASER VLY QUIL 100 13 1250 25 100 13 1250 25
SRN VRISL QUIL 16 10 150 7 100 11 1400 17
CNTRL VRISL QUIL 9 8 50 7 100 9 1050 10
NRN VRISL HRDY 10 6 50 4 100 8 1150 10
TERRACE ANT 9 1 200 9 100 1 1200 10
STEWART ANT 9 1 100 5 100 1 1200 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 SUNDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
VANCOUVER W 33 W 44 SW 56
PORT HARDY NW 46 NW 54 NW 43
SANDSPIT W 37 W 43 W 41
TODAY'S VENTING: GOOD.
VENTING FOR MONDAY: FAIR TO GOOD.
VENTILATION GUIDELINES:
0-33.....POOR
34-54.....FAIR
55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.
END/JDG