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

VAZ098-220900-
Back Bay NWR RAWS-Virginia Beach VA
36.68N  75.93W Elev. 8 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                      37          51          43          58          44
TEMP             49 45 42 39 39 45 49 50 47 46 45 44 44 52 56 56 51 48 47 46 45
DEWPT            36 35 33 31 30 30 30 32 35 35 36 37 38 40 42 42 42 41 40 40 40
MAX/MIN RH                   77          48          80          55          81
RH               61 68 70 74 71 57 48 51 63 68 71 75 78 64 58 59 72 77 77 79 81
WIND DIR          W  W  W  W  W  W  W  W  W  W  W  W NW NW  W  W  W  W  W  W  W
WIND DIR DEG     27 27 27 27 27 27 26 26 26 26 27 28 29 30 29 28 28 28 28 28 27
WIND SPD         11 13 13 13 12 14 16 17 19 20 19 18 16 16 16 14 10 10 10  9 10
CLOUDS           SC FW FW FW FW FW FW SC B1 B1 SC SC SC SC SC FW FW FW FW FW FW
CLOUDS(%)        35 17 10 22 17 17 23 45 68 51 33 31 28 29 29 23 17 17 16 14 13
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          20          10           5           0
QPF 12HR                      0           0           0           0           0
SNOW 12HR                 00-00       00-00       00-00                        
RAIN SHWRS                          S  S                                       
LAL                     1     1     1     1     1     1     1     1     1     1
HAINES                  4     4     4     4     3     4     5     4     4     4
MIX HGT              1200  1700  5000  4800  3200  2900  4700  4500  1500  1000
T WIND DIR              W     W     W     W     W     W    NW     W     W     W
T WIND SPD             25    23    20    29    35    27    24    21    16    12
SMOKE DISP             PR    PR    GD    VG    VG    GD    GD    GD    PR    PR
ADI                    24    39    70    82    51    65    69    70    21    14
MAX LVORI               3     3     3     1     3     3     3     3     4     4
STABILITY               D     D     D     D     D     D     D     D     E     E
CEILING              9300 12700 11600 22100  4700  4000 30000 30000 28300 18200
PRESSURE            29.67 29.62 29.63 29.57 29.56 29.63 29.81 29.88 29.96 30.05


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          60    47    64    55    65    48    56    46    58
TEMP          58 53 50 48 62 59 57 56 64 56 51 48 55 51 48 47 57 52
DEWPT         41 43 43 43 48 49 48 51 52 46 40 39 40 41 41 41 43 44
MIN/MAX RH       51    83    56    84    58    71    56    81    59
RH            53 69 78 83 60 68 73 83 65 69 66 72 56 69 78 82 60 76
WIND DIR       W  W  W SW SW  S SW SW  W  N  N  N  N  N  W  W SW NW
WIND SPD      10  6  5  4 10 10 13 13 12 10 10 10 10  8  9  9 11  9
AVG CLOUDS    FW FW FW FW FW FW SC B1 B1 SC SC SC SC SC B1 B1 B1 B2
POP 12HR          0     0     0    10    10    10    10    20    20
RAIN                                                        S  S  S

$$

NCZ014-220900-
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