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2
FPCN39 CWLW 191530
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 PST TUESDAY 19 NOVEMBER 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      ##   ##     ###  ##     40   -6     600  10
KAMLOOPS     KEL      ##   ##     ###  ##     50   -8    1050  10
OKANAGAN     KEL      ##   ##     ###  ##     40   -3    1250   5
CASTLEGAR    GEG      ##   ##     ###  ##     40   -2     500  15
CRANBROOK    GEG      ##   ##     ###  ##      9   -9     950  14
REVELSTOKE   KEL      ##   ##     ###  ##     47   -6    1400   5


*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    VR   5   VR   5   SW  24
CRANBROOK             VR   5   SW  28

           INVERSION HT    BREAKTHRU TEMP
KELOWNA         1710 m          8 C
SPOKANE         2100 m         13 C

TODAY'S VENTING: Poor in the east and fair in the west.

VENTING FOR WEDNESDAY: Fair.

VENTING OUTLOOK THURSDAY THRU SATURDAY: Fair to good in the
afternoons.

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    1750  29
PR. GEORGE   P.G.     ##   ##     ###  ##     79  -15    1300  18
SMITHERS     P.G.     ##   ##     ###  ##     75  -12    1400  18
WELLS GRAY   P.G.     ##   ##     ###  ##    100  -13    1900  27
FT NLSN      F.N.     ##   ##     ###  ##     70  -18    1400  15
FT STJOHN    F.N.     ##   ##     ###  ##     48  -19    1400   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            NE  35   E   17
SMITHERS              E   41   E   17

           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      2600 m          4 C
FT. NELSON       900 m        M17 C

TODAY'S VENTING: GOOD EXCEPT FAIR IN THE NORTHEAST.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: GENERALLY GOOD IN THE
AFTERNOONS

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     ##   ##     ###  ##     41    3     350  13
FRASER VLY   QUIL     ##   ##     ###  ##     50    0     300  20
SRN VRISL    QUIL     ##   ##     ###  ##     44    4     400  11
CNTRL VRISL  QUIL     ##   ##     ###  ##     93    3     950  11
NRN VRISL    HRDY     ##   ##     ###  ##     95    1     950  17
TERRACE      ANN      ##   ##     ###  ##     90   -8     900  17
STEWART      ANN      ##   ##     ###  ##     90   -4     900  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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    N   11   NW  22   W   43
PORT HARDY   NE  11   NW  19   NW  31
SANDSPIT     NE  22   NE  15   N   17

           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE       800 m          8 C
PORT HARDY      No inversion
ANNETTE         Missing

TODAY'S VENTING: fair in the south. good in the north.

VENTING FOR WEDNESDAY: GOOD

VENTING OUTLOOK THURSDAY THRU SATURDAY: continuing good.

VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.

END/MWSO


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