National Weather Service United States Department of Commerce

Powerful Pacific System Impacting the West; First Significant Snow for Portions of the East

Power Pacific system will continue to bring significant impacts for Pacific Northwest into northern California the remainder of the week. Dangerous coastal affects, heavy rain, flooding, strong winds, and higher elevation mountain snow continues. Meanwhile, a storm across the east is set to bring the first accumulating snow to many higher elevations of the Catskills into the central Appalachians. Read More >


	EXPERIMENTAL...FIRE WEATHER POINT FORECAST MATRICES
NATIONAL WEATHER SERVICE Wakefield VA
410 PM EST Thu Nov 21 2024

VAZ064-220900-
Ft AP Hill RAWS - Caroline VA
38.10N  77.27W Elev. 201 ft
410 PM EST Thu Nov 21 2024

Date           11/21/24      Fri 11/22/24            Sat 11/23/24            Sun
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                      30          48          38          57          36
TEMP             42 38 34 32 32 40 46 46 43 41 40 39 39 49 55 54 46 42 40 39 37
DEWPT            34 31 27 24 24 27 30 31 33 33 33 34 35 36 38 38 38 36 35 34 34
MAX/MIN RH                   78          51          83          49          91
RH               72 76 75 74 71 59 53 56 68 74 76 82 85 62 53 54 73 80 83 84 91
WIND DIR          W  W  W  W SW  W  W  W  W  W NW NW NW NW  W  W  W  W  W  W  W
WIND DIR DEG     27 28 27 26 24 25 25 26 26 27 29 31 30 30 29 29 29 28 27 26 25
WIND SPD          5  5  5  5  4  9 11 11 10 10  9  8  5  9 10 10  6  4  3  3  3
CLOUDS           B1 SC FW FW SC B1 B2 B2 OV B1 SC SC SC SC B1 SC SC SC SC SC SC
CLOUDS(%)        61 27 23 24 26 63 83 86 90 67 44 42 41 47 53 40 26 27 29 30 32
VSBY              7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7
POP 12HR                     10          50          20           0           0
QPF 12HR                      0        0.04           0           0           0
SNOW 12HR                 00-00       00-00       00-00                        
RAIN                          S  C                                             
RAIN SHWRS                          C  C  S  S                                 
SNOW                          S                                                
LAL                     1     1     1     1     1     1     1     1     1     1
HAINES                  4     4     4     3     3     4     4     4     4     4
MIX HGT               900   800  3700  3300   800   700  4900  4400   500   400
T WIND DIR              W     W     W     W     W    NW    NW     W     W    SW
T WIND SPD             21    16    17    21    16     9    16    20     9     3
SMOKE DISP             PR    PR    GD    GD    PR    PR    GD    GD    PR    PR
ADI                    13    10    64    60    18     8    75    66     9     3
MAX LVORI               4     4     3     3     4     5     3     4     5     7
STABILITY               F     F     C     D     D     D     C     D     F     F
CEILING              5500  5400 17100  4000  2400 30000 30000  4000 15900 30000
PRESSURE             29.5 29.45 29.44 29.36 29.37 29.48 29.67 29.71 29.82 29.89


Date           11/24Mon 11/25/24Tue 11/26/24Wed 11/27/24Thu 11/28/24
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          58    36    63    49    62    37    51    31    48
TEMP          56 46 40 37 60 56 52 50 61 49 42 38 49 40 35 32 46 39
DEWPT         35 38 37 36 41 44 45 47 40 35 31 30 30 32 31 31 32 35
MIN/MAX RH       44    97    46    87    41    74    46    96    56
RH            46 74 89 96 49 65 78 89 46 59 65 74 48 73 85 96 58 85
WIND DIR       W  W SW  S SW  S SW  W NW  N  N  N  W  N  N  N NW  N
WIND SPD       5  3  2  3  5  5  6  6 10  4  3  3  4  3  1  2  6  4
AVG CLOUDS    SC FW FW FW SC SC B1 B1 B1 SC SC SC SC SC B1 B1 B2 B2
POP 12HR          0     0     0    10    10     5    10    20    30
RAIN                                                     S  S  C  C

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