FPCN39 CWLW 211331
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 PDT THURSDAY 21 MAY 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 29 20 650 5 100 26 3200 7
KAMLOOPS KEL 19 18 600 4 100 25 3350 7
OKANAGAN KEL 19 18 600 4 86 23 2050 7
CASTLEGAR SPOK 53 17 1650 5 96 23 3500 5
CRANBROOK SPOK 55 15 1950 6 100 21 3950 6
REVELSTOKE KEL 22 18 750 5 100 25 3450 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
PENTICTON NW 11 N 19 N 24
CRANBROOK VR 5 E 19
INVERSION HT BREAKTHRU TEMP
KELOWNA 800 m 19 C
SPOKANE 2200 m 19 C
TODAY'S VENTING: GOOD
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: 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 13 950 2 59 22 3950 2
PR. GEORGE P.G. 13 13 850 2 63 22 3700 2
SMITHERS P.G. 13 15 900 1 58 22 3500 2
WELLS GRAY P.G. 9 13 1000 2 59 22 4000 2
FT NLSN F.N. 25 16 450 18 91 24 1100 20
FT STJOHN F.N. 15 17 750 20 100 24 3700 13
*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 S 11 S 19
SMITHERS S 22 S 19
INVERSION HT BREAKTHRU TEMP
PR. GEORGE 1200 m 20 C
FT. NELSON 1500 m 24 C
TODAY'S VENTING: GOOD
VENTING FOR FRIDAY: GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD
COAST
UPPER ***** MORNING ****** ***** AFTERNOON ****
AIR VI Tmp MXG HT Wnd VI Tmp MXG HT Wnd
(mASL) (kt) (mASL) (kt)
VANCOUVER QUIL 70 16 1250 7 50 20 1550 8
FRASER VLY QUIL 71 16 1250 7 52 21 1550 8
SRN VRISL QUIL 68 16 1250 7 54 20 1450 7
CNTRL VRISL QUIL 69 17 1250 7 60 25 2650 7
NRN VRISL HRDY 14 11 550 1 30 16 700 2
TERRACE ANT 80 15 1000 14 50 21 2350 18
STEWART ANT 36 14 450 6 60 21 1900 15
*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 19 W 13 SW 9
PORT HARDY S 30 S 44 S 48
SANDSPIT S 61 S 61 S 65
INVERSION HT BREAKTHRU TEMP
QUILLAYUTE 1700 m 21 C
PORT HARDY 1200 m 20 C
ANNETTE 100 m 13 C
TODAY'S VENTING: POOR TO GOOD
VENTING FOR FRIDAY: POOR TO GOOD
VENTING OUTLOOK SATURDAY THRU MONDAY: GOOD
VENTILATION GUIDELINES:
0-33.....POOR
34-54.....FAIR
55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.
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