FPCN39 CWLW 111434
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 Wednesday 11 June 1997 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 12 21 500 1 49 25 750 8
KAMLOOPS KEL 11 19 500 1 44 24 850 8
OKANAGAN KEL 11 19 500 1 44 24 850 8
CASTLEGAR SPOK 32 19 800 8 78 25 1950 7
CRANBROOK SPOK 9 18 950 5 100 23 3950 6
REVELSTOKE KEL 9 17 500 1 38 23 850 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 WEDNESDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PENTICTON VR 5 VR 5 W 11
CRANBROOK E 9 E 20
INVERSION HT BREAKTHRU TEMP
KELOWNA 975 m 23 C
SPOKANE 975 m 19 C
TODAY'S VENTING: VENTING WILL BE FAIR FOR MOST AREAS TODAY.
THE WARM AIR IN THE LOW LEVELS AND THE SURFACE INVERSION WILL MEAN
ONLY A SMALL WINDOW -AT MOST- FOR GOOD VENTING THIS AFTERNOON.
VENTING FOR THURSDAY: GOOD.
VENTING OUTLOOK FRIDAY THRU SUNDAY: 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. 9 17 950 8 61 23 1750 9
PR. GEORGE P.G. 24 17 850 9 44 23 1100 10
SMITHERS P.G. 15 15 650 4 31 19 900 7
WELLS GRAY P.G. 9 16 1000 8 100 24 4000 12
FT NLSN F.N. 18 16 500 8 100 24 3400 6
FT STJOHN F.N. 9 14 700 8 100 22 3700 6
*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.
FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PR. GEORGE E 17 E 28
SMITHERS VR 5 SE 28
INVERSION HT BREAKTHRU TEMP
PR. GEORGE 1180 m 26 C
FT. NELSON 670 m 21 C
TODAY'S VENTING: SHARP INVERSION PRESENT OVER REGIONS. THE LOWER
LYING AREAS WILL SEE THE LEAST FAVOURABLE CONDITIONS BECAUSE OF THE
HIGH BREAKTHROUGH TEMPERATURE NECESSARY.
VENTING FOR THURSDAY: GOOD.
VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR TO GOOD.
COAST
UPPER ***** MORNING ****** ***** AFTERNOON ****
AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd
(mASL) (kt) (mASL) (kt)
VANCOUVER QUIL 75 17 750 15 100 21 1250 16
FRASER VLY QUIL 70 16 650 15 100 22 1400 16
SRN VRISL QUIL 67 17 700 12 94 21 1100 14
CNTRL VRISL QUIL 76 18 800 13 95 21 1150 14
NRN VRISL HRDY 9 13 0 2 28 15 600 4
TERRACE ANT 80 16 1000 15 100 22 3200 19
STEWART ANT 53 17 700 8 100 22 3000 17
*SUBTRACT 20 FROM THE VENTILATION INDEX IN VALLEYS IF THE MIXING
HEIGHT IS BELOW THE HEIGHT OF THE LOCAL HILLS.
FORECAST UPPER WINDS FOR WEDNESDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
VANCOUVER VR 5 SW 9 S 13
PORT HARDY VR 5 S 11 SE 26
SANDSPIT S 11 SE 11 SE 22
INVERSION HT BREAKTHRU TEMP
QUILLAYUTE nil m ## C
PORT HARDY nil m ## C
ANNETTE nil m ## C
TODAY'S VENTING:
WEAK OR NO INVERSION EVIDENT THIS MORNING. LOW LEVEL WINDS WILL
FAVOUR GOOD VENTING OVER MOST AREAS ALTHOUGH THE MIXING HEIGHTS WILL
NOT BE HIGH.
VENTING FOR THURSDAY: GOOD.
VENTING OUTLOOK FRIDAY THRU SUNDAY: FAIR.
VENTILATION GUIDELINES:
0-33.....POOR
34-54.....FAIR
55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.
END/BJS