Point Forecast Matrices
Issued by NWS Great Falls, MT

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Point Forecast Matrices
National Weather Service Great Falls MT
305 AM MST Mon Dec 18 2017

MTZ012-182300-
Great Falls-Cascade MT
47.47N 111.38W Elev. 3663 ft
305 AM MST Mon Dec 18 2017

Date                Mon 12/18/17            Tue 12/19/17            Wed 12/20/17
MST 3hrly     02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

Max/Min                      45          27          35          27          30
Temp             42 42 43 44 35 31 29 28 27 27 30 35 33 35 36 37 32 27 21 18 14
Dewpt            30 31 28 25 24 24 23 24 23 25 26 29 27 27 27 27 25 22 19 14 11
RH               62 65 55 47 64 75 78 85 85 92 85 78 78 72 69 67 75 81 92 84 88
Wind dir         SW SW SW  W  W NE SE  E  E NE NE SE  E  S  S  S  S SW NW  N  N
Wind spd         36 35 31 26 17 11 11  8 12 11 11 12 13 13 14 16 17 13 19 18 18
Wind gust        51 50 43 39
Clouds           OV OV B2 B2 OV OV OV OV OV OV OV OV OV OV OV B2 OV OV OV OV OV
PoP 12hr                     10          60          60          40          60
QPF 12hr                      0        0.07        0.11        0.04        0.14
Snow 12hr                 00-00           1           1
Rain                          C
Snow                          C  C  L  L  L  L  C  C  C  C  C  C  L  L  L  L  C
Obvis                                                            BS BS BS BS
Wind chill                                                                   -3
Min chill                                                                    -4
High Wind         W  W
Winter Storm                                 A  A  A  A  A  A  A  A  A


Date               Thu 12/21/17  Fri 12/22/17  Sat 12/23/17  Sun 12/24/17
MST 6hrly     23   05 11 17 23   05 11 17 23   05 11 17 23   05 11 17
UTC 6hrly     06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

Min/Max             2    23       9    12      -1     9       3    12
Temp           7    2 17 23 21   14  6  4  1    2  4  9  5    8 12  7
Dewpt          1   -3  8 18 18   12  1  1 -3   -1 -4  2 -3    2  5  0
PWind dir           W    SW       W     N      NW     W       W     W
Wind char          GN    BZ      GN    GN      GN    BZ      BZ    BZ
Avg clouds    B2   SC FW SC B2   OV OV OV OV   B2 B2 B2 B2   B1 B1 B1
PoP 12hr           30     5      50    40      30    20      20    20
Snow           C    S        C    C  C  C  C    C  S  S  S    S  S  S

$$
MTZ010-182300-
Cut Bank-Glacier MT
48.60N 112.39W Elev. 3838 ft
305 AM MST Mon Dec 18 2017

Date                Mon 12/18/17            Tue 12/19/17            Wed 12/20/17
MST 3hrly     02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

Max/Min                      39          23          27          17          20
Temp             39 39 38 35 28 25 25 24 24 23 25 27 26 26 25 25 20 17 17 17  7
Dewpt            27 31 29 25 22 19 19 19 21 21 25 26 25 24 23 24 19 16 15 11  5
RH               62 73 70 66 78 78 78 81 88 92100 96 96 92 92 96 96 96 92 77 91
Wind dir          W  W  W NW  N NE  S  S SE  E  E  E  E  E  E  N  N  N  N  N  N
Wind spd         39 33 25 18 12 12 11 10  9 13 17 16 16 16 14 12 13 19 21 19 16
Wind gust        55 47 36
Clouds           OV OV OV OV OV B2 OV OV OV OV OV OV OV OV OV OV OV OV OV B2 B2
PoP 12hr                     80          80          90          60          60
QPF 12hr                   0.06        0.10        0.30        0.13        0.08
Snow 12hr                     1           2           5
Rain                 S
Snow                 S  L  L  L  L  L  L  D  D  D  D  L  L  L  L  L  L  C  C  S
Obvis                                          BS BS             BS BS
Wind chill                                                                  -11
Min chill                                                                   -11
High Wind         W  W
Winter Storm                           A  A  A  A  A  A  A  A  A  A  A


Date               Thu 12/21/17  Fri 12/22/17  Sat 12/23/17  Sun 12/24/17
MST 6hrly     23   05 11 17 23   05 11 17 23   05 11 17 23   05 11 17
UTC 6hrly     06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

Min/Max            -3    21       8    10      -1    11       3    11
Temp           1    1 19 19 19   11  6  3  3    2 10  1  7   10 11  4
Dewpt         -6   -6 12 10 15    9  4  0 -2   -4  2 -5 -1    6  7  0
PWind dir           W    SW      NW     N      NW    NW       W     W
Wind char          GN    GN      BZ    BZ      BZ    BZ      BZ    BZ
Avg clouds    B2   SC FW B1 B2   OV OV OV B2   B2 B2 B2 B2   B1 B1 B1
PoP 12hr           20    10      50    30      20    20      20    10
Snow           S             C    C  C  C  S    S  S  S  S    S

$$
MTZ014-182300-
Helena-Lewis & Clark MT
46.61N 111.96W Elev. 3893 ft
305 AM MST Mon Dec 18 2017

Date                Mon 12/18/17            Tue 12/19/17            Wed 12/20/17
MST 3hrly     02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

Max/Min                      42          29          38          26          29
Temp             27 29 36 42 39 36 33 31 30 29 34 38 37 34 32 30 28 26 28 25 16
Dewpt            23 25 29 29 30 30 29 27 28 26 29 29 29 27 26 25 25 22 22 15  9
RH               85 85 75 60 70 79 85 85 92 88 82 70 72 75 78 81 88 85 78 65 73
Wind dir         SW SW  W  W  W SW SW SW  S  S SE  S  S  S  S  S  S SW NW NW  N
Wind spd         14 14 17 18 12  6  4  3  3  3  4  8  6  8  5  8  5  5 10 12  9
Wind gust                 29 26
Clouds           B2 B2 B1 B1 B2 B2 B2 B2 B2 B2 OV OV OV B2 OV B2 B2 B2 OV OV OV
PoP 12hr                     10          30          30          30          60
QPF 12hr                      0        0.01        0.02        0.02        0.10
Snow 12hr                 00-00           T           T
Rain                          S  S              C  C  C  C
Snow                             S  C  C  C  C  C  C     C  C  C  L  L  L  L  C
High Wind         W  W


Date               Thu 12/21/17  Fri 12/22/17  Sat 12/23/17  Sun 12/24/17
MST 6hrly     23   05 11 17 23   05 11 17 23   05 11 17 23   05 11 17
UTC 6hrly     06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

Min/Max             7    22      10    15       2     9      -1    11
Temp          11    7 20 17 21   16 10  5  4    6  5  0  0    6 11  8
Dewpt          5    5  8  8 16   14  0 -6 -2    3 -7-12 -7    2  0 -3
PWind dir          NW    SW       W     N       N    NW       W     W
Wind char          LT    LT      LT    GN      GN    LT      LT    LT
Avg clouds    B2   B1 SC SC B2   B2 OV OV OV   B2 B2 B1 B1   B1 B1 B1
PoP 12hr           40    10      40    40      30    20      20    20
Snow           C    S        C    C  C  C  C    C  S  S  S       S

$$
MTZ055-182300-
Bozeman-Gallatin MT
45.78N 111.16W Elev. 4475 ft
305 AM MST Mon Dec 18 2017

Date                Mon 12/18/17            Tue 12/19/17            Wed 12/20/17
MST 3hrly     02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

Max/Min                      37          27          37          26          31
Temp             23 25 34 37 36 31 31 29 29 27 34 37 37 34 34 34 31 26 30 30 23
Dewpt            20 21 25 27 25 24 25 24 24 23 28 31 28 26 25 26 23 22 24 26 18
RH               88 84 69 67 64 75 78 81 81 85 78 79 70 72 69 72 72 85 78 85 81
Wind dir         SW SW SW SW SW SW SW SW  S  S  S  S SW  S SW  S  S SW SW NW NW
Wind spd         10  9 11 14 10  9  8  9  8  6  5  8  6  9  8  9  8  9  6  8  6
Clouds           OV OV B2 B2 B2 B2 OV OV OV OV OV OV OV B2 OV B2 B2 B2 B2 B2 OV
PoP 12hr                     20          40          30          20          60
QPF 12hr                      0        0.03        0.02           0        0.13
Snow 12hr                 00-00           T           T
Rain                       S  C                 C  C  S  S
Snow                       S  C  C  C  C  C  C  C  C  S  S  S  S  C  C  L  L  C


Date               Thu 12/21/17  Fri 12/22/17  Sat 12/23/17  Sun 12/24/17
MST 6hrly     23   05 11 17 23   05 11 17 23   05 11 17 23   05 11 17
UTC 6hrly     06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

Min/Max             4    19       7    15      -3     4      -9     8
Temp           9    5 13 19 15    9 12  8 -1    2 -1  2 -8   -1  6  7
Dewpt          4    2  4  8  4    6  5 -1-11   -1-12 -9-14   -5 -6 -2
PWind dir          NW    SW      SW    NW      NW     W      SW    SW
Wind char          LT    LT      LT    LT      LT    LT      LT    LT
Avg clouds    OV   B2 SC SC B1   B2 OV OV OV   B2 B2 B2 B1   B1 B1 B1
PoP 12hr           50    10      30    50      40    20      10    20
Snow           C    S        C    C  C  C  C    C  S  S          S  S

$$
MTZ055-182300-
West Yellowstone-Gallatin MT
44.66N 111.11W Elev. 6700 ft
305 AM MST Mon Dec 18 2017

Date                Mon 12/18/17            Tue 12/19/17            Wed 12/20/17
MST 3hrly     02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

Max/Min                      23          16          28          19          28
Temp             15 16 19 23 21 19 18 16 17 17 22 28 25 22 22 25 22 19 23 28 22
Dewpt            13 15 16 17 18 15 15 14 15 16 18 20 19 17 16 21 15 17 18 23 18
RH               92 96 88 77 88 84 88 92 92 96 84 71 78 81 77 84 74 92 81 81 84
Wind dir         SW SW SW SW SW SW SW SW  S  S SW SW  S SW SW SW SW  S SW SW SW
Wind spd         11 11 14 13  9  5  8 12  6  8 11 11  9  8 11 14 11 12 14 11  6
Wind gust                 25                                     24
Clouds           OV OV OV OV OV OV OV OV OV OV OV OV OV OV OV B2 OV OV OV OV OV
PoP 12hr                     40          50          40          40          70
QPF 12hr                   0.03        0.04        0.02        0.04        0.19
Snow 12hr                     T           1           T
Snow              C  C  C  C  C  C  C  C  C  C  C  C  C  C  C  C  L  L  L  L  C


Date               Thu 12/21/17  Fri 12/22/17  Sat 12/23/17  Sun 12/24/17
MST 6hrly     23   05 11 17 23   05 11 17 23   05 11 17 23   05 11 17
UTC 6hrly     06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

Min/Max            -3    16       2    14     -10    -1     -26    -1
Temp           8   -3 11 15  3    4 13 12 -4  -10 -7 -1-20  -25 -6 -2
Dewpt          2   -5  3  6 -1    2  8 11-10  -14-13 -7-24  -27 -9 -6
PWind dir           N    NW      SW     S      NW     N      NE    SW
Wind char          LT    LT      LT    LT      LT    LT      LT    LT
Avg clouds    OV   B2 SC SC SC   B2 OV OV OV   B2 B1 B1 B1   SC SC SC
PoP 12hr           50    20      40    50      40    20      10    10
Snow           C    S     S  S    C  C  C  C    C  S  S

$$
MTZ008-182300-
Dillon-Beaverhead MT
45.26N 112.55W Elev. 5357 ft
305 AM MST Mon Dec 18 2017

Date                Mon 12/18/17            Tue 12/19/17            Wed 12/20/17
MST 3hrly     02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

Max/Min                      37          25          38          26          31
Temp             24 24 32 37 32 30 29 28 27 25 33 38 33 31 31 30 28 26 31 29 19
Dewpt            18 18 21 26 19 22 21 22 20 19 25 26 21 20 21 21 19 20 22 18  9
RH               77 77 63 64 58 72 72 78 74 78 72 62 61 63 66 69 68 78 69 63 64
Wind dir          S  S SW SW  S  S  S  S  S  S  S  S  S  S  S  S  S  S SW SW  N
Wind spd         23 21 21 19 16 14 13 11 14 13 14 17 16 17 14 11 12 11 11  9 10
Clouds           B2 B2 B2 B1 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 B2 OV
PoP 12hr                     20          30          20          20          60
QPF 12hr                      0        0.03           0           0        0.11
Snow 12hr                 00-00           T       00-00
Snow                       S  S  S  C  C  S  S  S  S  S  S  S  S  C  C  L  L  C


Date               Thu 12/21/17  Fri 12/22/17  Sat 12/23/17  Sun 12/24/17
MST 6hrly     23   05 11 17 23   05 11 17 23   05 11 17 23   05 11 17
UTC 6hrly     06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

Min/Max             6    19       9    16      -5     2      -9     6
Temp          11    6 15 13 15   17 15  3 -2   -5 -1 -7 -9   -6  4  5
Dewpt          4    2  4  1  4   10 11 -8-11   -8-12-15-16  -11 -6 -7
PWind dir           N    SW       S     E      NE     N      SW     S
Wind char          GN    LT      GN    GN      GN    GN      GN    GN
Avg clouds    B2   B2 SC SC B1   B2 B2 OV OV   B2 B2 B1 B1   SC B1 SC
PoP 12hr           40    10      20    50      30    20      10    10
Snow           C    S             S  C  C  C    C  S

$$
MTZ011-182300-
Havre-Hill MT
48.54N 109.76W Elev. 2585 ft
305 AM MST Mon Dec 18 2017

Date                Mon 12/18/17            Tue 12/19/17            Wed 12/20/17
MST 3hrly     02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

Max/Min                      41          23          31          22          26
Temp             39 39 41 38 32 27 23 24 23 24 30 31 30 26 23 26 23 22 21 21 16
Dewpt            28 34 33 30 27 23 21 19 19 18 23 24 24 22 21 21 20 20 19 16 14
RH               64 82 73 73 81 85 92 81 84 77 75 75 78 85 92 81 88 92 92 81 92
Wind dir         SW  W  W NW NW  W  W SW SW  E  E  E  E  E  E  E  E NE  N  N  N
Wind spd         21 18 14 14 10  8  6  6  8  8 13 17 16 14 14 11 12 11 13 16 12
Clouds           OV OV OV OV OV B2 B2 B2 OV OV OV OV OV OV OV OV OV OV OV OV OV
PoP 12hr                     90          30          80          70          70
QPF 12hr                   0.06        0.03        0.12        0.15        0.17
Snow 12hr                     T           T           2
Rain              C  C  L
Snow                       D  C  C  C  C  C  C  D  D  L  L  L  L  L  L  L  L  C
Winter Storm                                 A  A  A  A  A  A  A  A  A


Date               Thu 12/21/17  Fri 12/22/17  Sat 12/23/17  Sun 12/24/17
MST 6hrly     23   05 11 17 23   05 11 17 23   05 11 17 23   05 11 17
UTC 6hrly     06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

Min/Max            -2    16       6    11       0    10       0     8
Temp           3   -2  6 16  9    8  7 11  1    3  7 10  0    4  6  8
Dewpt          0   -5  1  9  5    2  2  7 -2   -2  0  5 -4    0  2  4
PWind dir          NW    SW       W    NW      NW     W       W     W
Wind char          GN    GN      GN    BZ      GN    BZ      BZ    BZ
Avg clouds    B2   B1 SC SC B1   B2 B2 B2 B2   B2 B1 B2 B1   B1 B1 B1
PoP 12hr           30     5      30    20      20    20      20    10
Snow           C    S        C    C  S  S  S    S  S  S  S

$$
MTZ051-182300-
Lewistown-Fergus MT
47.05N 109.46W Elev. 4144 ft
305 AM MST Mon Dec 18 2017

Date                Mon 12/18/17            Tue 12/19/17            Wed 12/20/17
MST 3hrly     02 05 08 11 14 17 20 23 02 05 08 11 14 17 20 23 02 05 08 11 14 17
UTC 3hrly     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

Max/Min                      44          25          36          27          32
Temp             39 39 42 44 38 30 25 25 25 27 31 36 32 32 31 34 27 32 29 24 14
Dewpt            25 24 27 29 29 29 22 21 22 24 27 29 28 28 25 26 20 26 27 22 12
RH               57 54 55 55 70 96 88 84 88 88 85 75 85 85 78 72 74 78 92 92 92
Wind dir         SW SW  W  W NW NW  W SW  E SE SE  S  S  S  S SW SW  W NW NW NW
Wind spd         27 26 25 24 17  9  5  4  5 12 11  9 11 10 10 12 12 11 10 13 14
Wind gust        37 36 35
Clouds           OV B2 B2 B2 OV OV OV OV OV OV OV OV OV OV OV B2 B2 B2 B2 OV OV
PoP 12hr                     30          80          60          40          60
QPF 12hr                   0.01        0.12        0.09        0.03        0.12
Snow 12hr                 00-00           2           1
Rain                    S  S
Snow                          L  L  D  L  L  L  C  C  C  C  C  C  C  C  L  L  C
Wind chill                                                                   -1
Min chill                                                                    -1
Winter Storm                                 A  A  A  A  A  A  A  A  A


Date               Thu 12/21/17  Fri 12/22/17  Sat 12/23/17  Sun 12/24/17
MST 6hrly     23   05 11 17 23   05 11 17 23   05 11 17 23   05 11 17
UTC 6hrly     06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

Min/Max             1    23       9    10      -2     8       1     8
Temp           7    1 18 22 20   14  6  5  1   -1 -1  8  1    8  8  5
Dewpt          3   -4  9 13 13   12  0  3 -1   -4 -9  3 -8   -1  0  1
PWind dir          NW    SW       W    NW      NW    NW       W     W
Wind char          GN    LT      GN    GN      GN    GN      GN    GN
Avg clouds    OV   B2 SC SC B1   B2 OV OV OV   B2 B2 B2 B2   B1 B1 B1
PoP 12hr           40    10      40    40      30    20      20    20
Snow           C    S        C    C  C  C  C    C  S  S  S    S  S  S

$$
http://www.weather.gov/greatfalls



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