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FPCN39 CWLW 061430
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 TUESDAY 6 AUGUST 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 44 20 1000 5 100 25 3200 9
KAMLOOPS KEL 34 18 900 5 100 25 3350 9
OKANAGAN KEL 44 19 1200 5 100 25 3350 9
CASTLEGAR GEG 29 18 900 5 100 24 3500 13
CRANBROOK GEG 10 13 950 12 100 20 3950 16
REVELSTOKE KEL 10 15 500 1 100 20 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 TUESDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PENTICTON W 9 W 19 NW 26
CRANBROOK W 15 NW 39
INVERSION HT BREAKTHRU TEMP
KELOWNA 460 m 16 C
SPOKANE 840 m 17 C
TODAY'S VENTING: Becoming good by late morning. Shallow inversion
should be removed quickly with daytime heating.
VENTING FOR WEDNESDAY: Fair to good.
VENTING OUTLOOK THURSDAY THRU SATURDAY: Fair to poor Thursday and
Friday under strong ridge of high pressure. Improving to good
Saturday as ridge weakens and winds strengthen.
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. 100 15 1550 28 100 19 3950 26
PR. GEORGE P.G. 9 15 700 27 100 19 2150 26
SMITHERS ANN 89 14 1800 11 100 20 3500 16
WELLS GRAY P.G. 100 16 2150 26 100 20 4000 26
FT NLSN F.N. 31 14 800 6 97 18 2250 9
FT STJOHN F.N. 72 13 1650 10 100 18 2900 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 TUESDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PR. GEORGE W 39 NW 54
SMITHERS W 33 NW 52
INVERSION HT BREAKTHRU TEMP
PR. GEORGE 860 m 18 C
FT. NELSON 610 m 13 C
TODAY'S VENTING: Good. Shallow inversions and strong winds off
the surface.
VENTING FOR WEDNESDAY: GOOD
VENTING OUTLOOK THURSDAY THRU SATURDAY: Fair Thursday under
settling ridge of high pressure then improving to good Friday
and Saturday as cold front sweeps through Interior.
COAST
UPPER ***** MORNING ****** ***** AFTERNOON ****
AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd
(mASL) (kt) (mASL) (kt)
VANCOUVER QUIL 33 17 900 3 48 23 1350 4
FRASER VLY QUIL 33 18 900 3 54 25 1650 4
SRN VRISL QUIL 33 16 850 3 47 23 1250 4
CNTRL VRISL QUIL 33 17 850 3 60 27 1950 3
NRN VRISL HRDY 19 14 250 4 36 19 700 4
TERRACE ANN 87 17 1250 11 100 21 2500 14
STEWART ANN 87 17 1250 11 100 21 2300 11
*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.
FORECAST UPPER WINDS FOR TUESDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
VANCOUVER SW 13 NW 22 NW 32
PORT HARDY NW 11 NW 22 NW 33
SANDSPIT W 17 NW 30 NW 43
INVERSION HT BREAKTHRU TEMP
QUILLAYUTE 2450 m 32 C
PORT HARDY 1110 m 22 C
ANNETTE 40 m 12 C
TODAY'S VENTING: Fair south coast under settling ridge of high
pressure. Good north coast.
VENTING FOR WEDNESDAY: Fair.
VENTING OUTLOOK THURSDAY THRU SATURDAY: Fair in the south Thursday
otherwise good.
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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