FPCN39 CWLW 071321
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 TUESDAY 7 APRIL 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      15    8     450   2     56   13    1350   5
KAMLOOPS     KEL      35   10     850   6    100   16    3350   7
OKANAGAN     KEL      14    8     550   2     95   14    2800   6
CASTLEGAR    SPOK     19    9     850   3    100   13    2650   9
CRANBROOK    SPOK      9    6     950  13    100   10    3950  11
REVELSTOKE   KEL      20    8     650   5     83   12    2450   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
PENTICTON    VR   5   W   13   SW  13
CRANBROOK             VR   5   NW  17
 
           INVERSION HT    BREAKTHRU TEMP
KELOWNA          740 m          9 C
SPOKANE         1030 m          9 C
 
TODAY'S VENTING: GOOD
 
VENTING FOR WEDNESDAY: GOOD
 
VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD EXCEPT LOCALLY FAIR
THURSDAY.
 
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    4     950  14    100   11    3950  15
PR. GEORGE   P.G.     23    3     850  10     93   10    1950  12
SMITHERS     P.G.     28    4     800   7     55    9    1200   8
WELLS GRAY   P.G.     24    4    1100  14    100   12    4000  15
FT NLSN      F.N.      9    6     400   8     81   14    2050   7
FT STJOHN    F.N.      9    6     700  10     73   11    2100   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            S   19   S   24
SMITHERS              SW  17   SW  24
 
           INVERSION HT    BREAKTHRU TEMP
PR. GEORGE      1050 m          8 C
FT. NELSON      1040 m         13 C
 
TODAY'S VENTING: GOOD
 
VENTING FOR WEDNESDAY: GOOD
 
VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD EXCEPT LOCALLY FAIR
 THURSDAY.
 
COAST
 
           UPPER      ***** MORNING ******    ***** AFTERNOON ****
             AIR      VI  Tmp  MXG HT  Wnd    VI  Tmp  MXG HT  Wnd
                               (mASL)  (kt)            (mASL)  (kt)
VANCOUVER    QUIL     99   10    1750  10    100   13    3100  12
FRASER VLY   QUIL     98   10    1700  10    100   13    2900  11
SRN VRISL    QUIL     79    9    1250   9    100   12    2200  10
CNTRL VRISL  QUIL     33    7     650   4    100   11    1900   9
NRN VRISL    HRDY     52    6     600   9    100   10    2250  12
TERRACE      ANT     100    7    2100  13    100   11    3200  14
STEWART      ANT      92    7    1450  10    100   11    3000  12
 
*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    SW  20   SW  22   SW  24
PORT HARDY   W   19   W   19   SW  19
SANDSPIT     W   20   W   19   SW  19
 
           INVERSION HT    BREAKTHRU TEMP
QUILLAYUTE      NONE           ## C
PORT HARDY      NONE           ## C
ANNETTE         NONE           ## C
 
TODAY'S VENTING: GOOD
 
VENTING FOR WEDNESDAY: GOOD
 
VENTING OUTLOOK THURSDAY THRU SATURDAY: GOOD
 
VENTILATION GUIDELINES:
          0-33.....POOR
          34-54.....FAIR
          55-100.....GOOD.
VENTILATION INDICES NORMALLY DROP TO POOR AFTER SUNSET.
 
 
END/PJS