National Weather Service United States Department of Commerce

Heavy rain, mountain snow and strong winds in the western U.S. this week

The western U.S. will experience active weather yet again this week as significant Pacific moisture brings rain and mountain snow to the region. This heavy rain will bring flood concerns to parts of WA, OR and CA. Very heavy snow is possible in the Sierra, Cascades, Great Basin and parts of the northern Rockies. Read More >


	EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE WAKEFIELD VA
520 PM EST TUE JAN 17 2017

VAZ096-180900-
GREAT DISMAL SWAMP RAWS-SUFFOLK VA
36.61N  76.55W ELEV. 35 FT
520 PM EST TUE JAN 17 2017

DATE           01/17/17      WED 01/18/17            THU 01/19/17            FRI
UTC 3HRLY     21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12
EST 3HRLY     16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07

MIN/MAX                      56          64          39          56          38
TEMP             58 59 59 59 58 59 62 61 51 47 44 41 40 48 53 53 47 44 42 40 39
DEWPT            53 54 55 56 54 51 47 44 42 40 39 38 38 38 37 37 39 38 39 39 39
MAX/MIN RH                   92          54          91          54         100
RH               83 83 87 92 86 75 58 54 70 76 82 89 91 68 54 54 73 79 89 96100
WIND DIR         SW SW SW SW  W  W NW NW NW NW  N  N  N  N  N  N SE  S  S  S SE
WIND DIR DEG     21 21 22 23 25 29 30 31 33 33 34 34 35 00 34 34 11 16 16 17 14
WIND SPD          8 10 10  9  9 11 11 10  6  4  4  3  3  5  3  3  1  3  2  3  2
CLOUDS           OV OV OV OV B2 B2 B1 SC FW FW FW FW FW SC SC SC SC SC B1 B2 B2
CLOUDS(%)        97100100 99 86 87 55 40 24 12 11 14 24 33 43 42 41 49 58 71 84
VSBY              7  4  5  4  2  5  7  7  7  7  7  7  7  7  7  7  7  7  7  7  6
POP 12HR                     60          40           0           0          10
QPF 12HR                   0.13        0.01           0           0           0
SNOW 12HR                 00-00       00-00       00-00                        
RAIN                                                                          L
RAIN SHWRS        C  L  L  L  C  S                                             
LAL                     1     1     1     1     1     1     1     1     1     1
HAINES                  4     4     4     4     3     3     4     4     4     3
MIX HGT               300   300  3100  4000  1400   400  3000  3000   300   300
T WIND DIR             SW    SW     W    NW    NW     N     N     N    SE    SE
T WIND SPD             16    13    14    18     6    10     6     3     3     4
SMOKE DISP             PR    PR    FR    GD    PR    PR    PR    PR    PR    PR
ADI                    15    15    53    65     5    11    18    15     2     6
MAX LVORI               4     5     4     3     5     6     4     3     6     9
STABILITY               D     D     D     C     C     F     F     B     B     F
CEILING              5500  4700  4000 30000 30000 26600 23500  3200 15900 13800
PRESSURE            30.03 29.95 29.93 29.94 30.04 30.06 30.10 30.04 30.06 30.01


DATE           01/20 SAT 01/21/17 SUN 01/22/17 MON 01/23/17 TUE 01/24/17
UTC 6HRLY     18 00 06 12 18 00 06 12 18 00 06 12 18 00 06 12 18 00
EST 6HRLY     13 19 01 07 13 19 01 07 13 19 01 07 13 19 01 07 13 19

MAX/MIN          54    44    57    45    58    50    63    47    59
TEMP          52 49 46 45 55 51 48 46 56 54 52 51 61 55 50 48 58 52
DEWPT         45 46 46 44 47 45 45 45 47 48 50 53 52 50 46 46 44 42
MIN/MAX RH       73   100    67    96    68   100    65    93    56
RH            78 88100 96 74 80 89 96 73 81 94100 72 83 86 93 60 69
WIND DIR      SE SE NW  N NE  E  E  E  E  E SE SE  S  S  S SW  W  W
WIND SPD       5  3  3  2  3  3  3  3  5  8  9 10 10  8  3  4  8  4
AVG CLOUDS    OV OV B2 B2 B1 B1 B2 B2 B2 B2 OV OV OV B2 B2 B2 B1 SC
POP 12HR         60    30    10    20    50    60    60    40    20
RAIN           L  L                                                
RAIN SHWRS           C              S  C  C  L  L  L  L  C  C  S  S
TSTMS                                        S  S                  

EXPERIMENTAL ONLY...THIS PRODUCT IS FOR PLANNING AND REVIEW PURPOSES ONLY AND
IS NOT TO BE SUBSTITUTED FOR AN OFFICIAL FIRE WEATHER SPOT
FORECAST.
BELOW IS A WEATHER ELEMENT KEY FOR THIS PRODUCT.
(NOTE...WINDS DO NOT REFLECT LOCAL TERRAIN EFFECTS.)

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
VSBY................................VISIBILITY VALUE IN STATUTE MILES
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
HAINES(CAT).........................HAINES INDEX
MIX HGT(FT AGL).....................MIXING HEIGHT
T WIND DIR(8 POINT COMPASS).........TRANSPORT WIND DIRECTION
T WIND SPD(MPH).....................TRANSPORT WIND SPEED
SMOKE DISPERSION....................SMOKE DISPERSION CATEGORY
     VALUES: VP = VERY POOR; PR = POOR; FR = FAIR; GD = GOOD
ADI (INDEX).........................ATMOSPHERIC DISPERSION INDEX
CEILING (FT)........................CEILING
PRESSURE (INCHES MERCURY)...........STATION PRESSURE
MAX LVORI (INDEX)...................LOW VISIBILITY OCCURRENCE RISK INDEX
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 DIR............................20 FT. WIND DIRECTION
WIND SPD(MPH).......................20 FT. WIND SPEED
AVG CLOUDS(CAT).....................AVERAGE CLOUD COVER CATEGORY
POP 12HR(%).........................PROBABILITY FOR ACCUMULATING PRECIPITATION
WEATHER...
     SEE DAY 1 THROUGH 3 WEATHER DESCRIPTIONS