FPCN39 CWLW 151504
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 15 May 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 13 22 600 1 100 29 3200 10
KAMLOOPS KEL 12 21 600 1 43 29 1150 5
OKANAGAN KEL 11 20 550 1 43 28 1150 5
CASTLEGAR SPOK 19 19 750 4 34 27 1150 4
CRANBROOK SPOK 9 17 950 5 31 25 1150 4
REVELSTOKE KEL 10 17 500 2 48 25 1450 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 THURSDAY AFTERNOON (WINDS IN KM/H):
900m 1800m 2700m
PENTICTON VR 5 W 11 W 17
CRANBROOK VR 5 W 20
INVERSION HT BREAKTHRU TEMP
KELOWNA 1150 m 28 C
SPOKANE 1100 m 27 C
TODAY'S VENTING: Poor to Fair. Good above 1200 metres.
VENTING FOR FRIDAY: Fair.
VENTING OUTLOOK SATURDAY THRU MONDAY: Good as a cold front sweeps
through the region and bringing gusty strong winds and
destabilizing the airmass.
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 17 2450 27 100 25 3950 20
PR. GEORGE P.G. 100 18 2050 20 100 23 3700 20
SMITHERS P.G. 21 16 700 8 100 23 3500 20
WELLS GRAY P.G. 100 18 4000 27 100 26 4000 20
FT NLSN F.N. 100 17 1850 32 100 28 3400 32
FT STJOHN F.N. 100 17 3700 33 100 24 3700 33
*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 SW 26 SW 35
SMITHERS SW 33 SW 35
INVERSION HT BREAKTHRU TEMP
PR. GEORGE 700 m 18 C
FT. NELSON 700 m 17 C
TODAY'S VENTING: Becoming good by mid morning in the Central
Interior. Becoming good in the afternoon in the Peace District.
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: Good as a cold front sweeps
through the region and bringing gusty strong winds and destabilizing
theairmass.
COAST
UPPER ***** MORNING ****** ***** AFTERNOON ****
AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd
(mASL) (kt) (mASL) (kt)
VANCOUVER QUIL 9 16 900 5 61 20 1250 8
FRASER VLY QUIL 9 16 900 2 90 25 2100 5
SRN VRISL QUIL 9 13 350 0 49 20 1000 5
CNTRL VRISL QUIL 9 17 700 0 43 22 1300 2
NRN VRISL HRDY 25 13 150 13 39 18 850 5
TERRACE ANT 34 14 1050 11 57 19 1550 7
STEWART ANT 34 14 700 8 57 19 1550 7
*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 W 15 SW 19 SW 28
PORT HARDY S 22 S 30 S 37
SANDSPIT SW 24 SW 31 SW 39
INVERSION HT BREAKTHRU TEMP
QUILLAYUTE 1400 m 25 C
PORT HARDY 700 m 20 C
ANNETTE 1800 m 22 C
TODAY'S VENTING: Generally fair except good inland in the afternoon
where temperature rise to the mid Twenties.
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY:Good as a cold front sweeps
through the region destabilizing the airmass.
VENTILATION GUIDELINES:
0-33.....POOR
34-54.....FAIR
55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.
END/lm