FPCN39 CWLW 021418
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 PST TUESDAY 2 MARCH 1999 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       9    3     550   0     28    7    1100   2
KAMLOOPS     KEL       9    2     550   0     71    7    1950   5
OKANAGAN     KEL       9    2     550   0     71    7    1950   5
CASTLEGAR    SPOK     20    2     800   4     56    7    1450   6
CRANBROOK    SPOK      9    1     950   8    100    6    3950  11
REVELSTOKE   KEL       9    2     600   0     15    4     800   2

*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    SE  11   SE  20   SE  37
CRANBROOK             VR   5   S   11

TODAY'S VENTING: POOR THIS MORNING RISING TO GOOD THIS AFTERNOON OVER
THE OKANAGAN KAMLOOPS AND SOUTHEASTERN AREAS. REMAINING POOR OVER THE
FRASER CANYON AND REVELSTOKE.

VENTING FOR WEDNESDAY: 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.     10    0     950  12    100    5    3950  19
PR. GEORGE   P.G.      9    0     700  11     89    4    1700  13
SMITHERS     P.G.     12    0     650   2     30    4    1100   7
WELLS GRAY   P.G.     20   -4    1500   8    100    5    4000  19
FT NLSN      F.N.      9   -7     450   0     25   -5    1050   3
FT STJOHN    F.N.     29   -7    1200   5     40   -4    1250   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
PR. GEORGE            VR   5   SW  15
SMITHERS              VR   5   VR  15

TODAY'S VENTING: POOR OVER ALL AREAS THIS MORNING RISING TO FAIR TO
GOOD MOST AREAS. EXCEPT REMAINING POOR AT FORT NELSON AND SMITHERS.

VENTING FOR WEDNESDAY: GOOD

COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     19    4     250   6     60    7    1000   7
FRASER VLY   QUIL     20    4     250   6     69    8    1200   7
SRN VRISL    QUIL     19    4     250   5     58    7     650  10
CNTRL VRISL  QUIL     19    4     250   5     65    8    1150   7
NRN VRISL    HRDY     28    4     450   5     79    7    1650   7
TERRACE      ANT      24    1    1500   5     40    5    2000   8
STEWART      ANT       9   -2     200   2     24    3     450   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 TUESDAY AFTERNOON (WINDS IN KM/H):
             900m     1800m    2700m
VANCOUVER    E   39   E   46   SE  48
PORT HARDY   E   30   E   35   E   33
SANDSPIT     NE  28   E   20   SE  13

TODAY'S VENTING: POOR THIS MORNING. RISING TO GOOD OVER VANCOUVER
ISLAND AND SOUTHWEST BC THIS AFTERNOON AND FAIR AT TERRACE.


VENTING FOR WEDNESDAY: GOOD


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


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