FPCN39 CWLW 251423
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 WEDNESDAY 25 MARCH 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       9    7     200   3     59   13    1300  12
KAMLOOPS     KEL      13    7     500   3     57   13    2050  12
OKANAGAN     KEL      16    8     550   3     57   13    2050  12
CASTLEGAR    SPOK     17    8     750   3     56   12    1100  12
CRANBROOK    SPOK     10    6     950  13     60   11    2150  14
REVELSTOKE   KEL      12    7     550   3     61    9     850  11

*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   W   17   W   31
CRANBROOK             W    9   W   24

TODAY'S VENTING: GOOD


VENTING FOR THURSDAY: 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.     81    3    1350  27    100    9    3950  21
PR. GEORGE   P.G.     40    4     850  21    100    9    2650  21
SMITHERS     P.G.     23    4     700   9    100    9    2100  17
WELLS GRAY   P.G.    100    4    1950  23    100    9    4000  21
FT NLSN      F.N.     17    5     500   6     80    9    1950   6
FT STJOHN    F.N.      9    5     700   6    100    9    3700  23

*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            SW  30   SW  39
SMITHERS              SW  33   SW  39


TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD



COAST

           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  TMP  MXG HT  WND    VI  TMP  MXG HT  WND
                               (MASL)  (KT)            (MASL)  (KT)
VANCOUVER    QUIL     71   10     750  13    100   13    1750  11
FRASER VLY   QUIL     79   11    1150  10     97   14    1850   9
SRN VRISL    QUIL     66   11     950   8     91   14    1800   8
CNTRL VRISL  QUIL      9    9     200   0     85   12    1600   8
NRN VRISL    HRDY     17    7      50  16     91   10    1100  13
TERRACE      ANT     100    7    1150  23    100    9    1700  24
STEWART      ANT      85    7     650  19    100    9    1150  20

*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    W   28   W   31   W   33
PORT HARDY   SW  39   SW  52   SW  56
SANDSPIT     W   43   W   44   W   44


TODAY'S VENTING: GOOD

VENTING FOR THURSDAY: GOOD



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


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