Fire Weather Point Forecast Matrices
Mason RAWS
Issued by NWS San Angelo, TX

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989
FOUS54 KSJT 182052
PFWSJT

FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE SAN ANGELO TX
252 PM CST WED JAN 18 2017<br>

TXZ170-191015-
MASON RAWS-MASON TX
30.74N  99.19W ELEV. 1463 FT
252 PM CST WED JAN 18 2017

DATE           01/18/17      THU 01/19/17            FRI 01/20/17            SAT
UTC 3HRLY     21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12
CST 3HRLY     15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06

MIN/MAX                      42          74          45          75          46
TEMP          58 54 47 46 44 43 48 63 74 67 53 52 49 46 51 65 75 68 54 53 50 47
DEWPT         49 49 47 45 43 43 45 47 43 44 42 40 40 38 40 40 40 42 44 44 42 41
MAX/MIN RH                  100          33          79          28          83
RH            72 83100 96 96100 89 56 33 43 66 63 71 73 66 40 28 39 69 71 74 79
WIND DIR      NW  W  S SW SW SW SW SW  W SW SW SW  W  W  W  W SW  S  S SW SW SW
WIND SPD       3  1  1  2  3  3  3 11 13  9  5  6  6  6  6 10  9  4  3  3  4  3
WIND GUST
CLOUDS        B2 B2 B1 SC SC SC FW FW FW FW CL CL FW FW FW SC SC SC SC SC B1 B1
CLOUDS(%)     79 76 64 42 37 33 22 11 10  6  5  5  7 14 15 32 31 41 50 48 69 63
POP 12HR                      5           5           0           5          10
QPF 12HR                      0           0           0           0           0
RAIN SHWRS                                                                    S
LAL                     1     1     1     1     1     1     1     1     1     1
HAINES                  6     6     6     5     5     5     5     5     6     6
MIX HGT              1000   500  2300  4700   900   200  2900  5000   900   200
T WIND DIR              S    SW    SW    SW    SW    SW     W     W    SW     W
T WIND SPD              3     6    13    24    10     9    11    14     5     4
SMOKE DISP             PR    PR    FR    VG    PR    PR    FR    GD    PR    PR


DATE           01/21/17  SUN 01/22/17  MON 01/23/17  TUE 01/24/17  WED 01/25/17
UTC 6HRLY     18 00 06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00
CST 6HRLY     12 18 00   06 12 18 00   06 12 18 00   06 12 18 00   06 12 18

MAX/MIN          72      46    63      36    67      46    67      39    60
TEMP          63 66 52   47 57 56 42   37 57 62 51   47 60 60 46   40 53 53
DEWPT         42 39 35   34 34 33 33   31 34 38 35   37 36 32 28   29 31 32
MIN/MAX RH       31      63    32      85    32      71    28      70    34
RH            46 37 52   60 42 42 70   79 42 41 54   68 41 35 49   64 43 44
PWIND DIR         W       W    NW      NW    SW       S     W      NW    NW
WIND CHAR       <15     15>   15>     <15   <15     <15   <15     <15   <15
AVG CLOUDS    B1 B1 B1   FW FW FW CL   CL CL CL CL   FW FW FW FW   FW FW FW
POP 12HR         20      20     0       0     0       0     0       5     5

$$

BELOW IS A WEATHER ELEMENT KEY FOR THIS PRODUCT

DAY 1 THROUGH 3...
MAX/MIN TEMP OR MIN/MAX TEMP(F).....MAXIMUM/MINIMUM AIR TEMPERATURE
TEMP(F).............................AIR TEMPERATURE
DEWPT(F)............................DEW POINT TEMPERATURE
MIN/MAX RH OR MAX/MIN RH(%).........MAXIMUM/MINIMUM HUMIDITY
RH(%)...............................RELATIVE HUMIDITY
WIND DIR(8 POINT COMPASS)...........20 FT. WIND DIRECTION
WIND DIR DEG(DEGREES)...............20 FT. WIND DIRECTION IN TENS OF DEGREES
                                    RELATIVE TO DUE NORTH.
     EXAMPLE: 09 = 90 DEGREES = EAST; 18 = 180 DEGREES = SOUTH;
              27 = 270 DEGREES = WEST; 36 = 360 DEGREES = NORTH
WIND SPD(MPH).......................20 FT. WIND SPEED
WIND GUST(MPH)......................20 FT. WIND GUST
WIND CHILL..........................WIND CHILL TEMPERATURE
HEAT INDX...........................HEAT INDEX
CLOUDS(CAT).........................CLOUD COVER CATEGORY
     EXAMPLE: CL = CLEAR; FW = FEW; SC = SCATTERED;
              B1 = MOSTLY CLOUDY; B2 = CONSIDERABLE CLOUDS; OV = OVERCAST
CLOUDS(%)...........................CLOUD COVER AS A PERCENTAGE
POP 12HR(%).........................PROBABILITY FOR ACCUMULATING PRECIPITATION
QPF 12HR(IN)........................LIQUID EQUIVALENT PRECIPITATION AMOUNT
WEATHER...
     TYPE...
       RAIN...........RAIN
       RAIN SHWRS.....RAIN SHOWERS
       TSTMS..........THUNDERSTORMS
       DRIZZLE........DRIZZLE
       SNOW...........SNOW
       SNOWSHWRS......SNOW SHOWERS
       SLEET..........SLEET
       FLURRIES.......FLURRIES
       FRZG RAIN......FREEZING RAIN
       FRZG DRZL......FREEZING DRIZZLE
     COVERAGE...
       S..............SLIGHT CHANCE
       C..............CHANCE
       L..............LIKELY
       O..............OCCASIONAL
       D..............DEFINITE
       AR.............AREAS
       PA.............PATCHY
OBVIS...............................OBSTRUCTION TO VISIBILITY
     TYPE...
       F..............FOG
       PF.............PATCHY FOG
       F+.............DENSE FOG
       H..............HAZE
       BS.............BLOWING SNOW
       K..............SMOKE
       BD.............BLOWING DUST
       AF.............VOLCANIC ASHFALL
LAL(CAT)............................LIGHTNING ACTIVITY LEVEL
MIX HGT(FT AGL).....................MIXING HEIGHT
T WIND DIR(8 POINT COMPASS).........TRANSPORT WIND DIRECTION
T WIND SPD(MPH).....................TRANSPORT WIND SPEED
ADI (INDEX).........................ATMOSPHERIC DISPERSION INDEX
DISPERSION..........................LDSI
MAX LVORI...........................LVORI
STA PRES (INCHES MERCURY)...........STATION PRESSURE
ADI (INDEX).........................ATMOSPHERIC DISPERSION INDEX
CEILING (FT)........................CEILING
STABILITY (CAT).....................PASQUILL TURNER STABILITY
WATCH/WARNING/ADVISORY...
     EXAMPLE: W = WARNING; Y = ADVISORY; A = WATCH
     IN EFFECT FOR THE INDICATED HOUR

DAY 4 THROUGH 7...
MAX/MIN TEMP OR MIN/MAX TEMP(F).....MAXIMUM/MINIMUM AIR TEMPERATURE
TEMP(F).............................AIR TEMPERATURE
DEWPT(F)............................DEW POINT TEMPERATURE
RH(%)...............................RELATIVE HUMIDITY
WIND SPD(MPH).......................20 FT. WIND SPEED
     EXAMPLE: <15 = LESS THAN 15 MPN; 15> = 15 MPH OR GREATER
AVE CLOUDS(CAT).....................AVERAGE CLOUD COVER CATEGORY
POP 12HR(%).........................PROBABILITY FOR ACCUMULATION PRECIPITATION
WEATHER...
     SEE DAY 1 THROUGH 3 WEATHER DESCRIPTIONS



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