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

VAZ096-220900-
Great Dismal Swamp RAWS-Suffolk VA
36.61N  76.55W Elev. 35 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                      32          51          39          59          36
TEMP             46 42 38 34 35 43 49 49 45 42 41 40 40 50 57 56 47 43 41 39 37
DEWPT            32 31 28 25 24 25 27 29 31 31 31 32 34 36 38 39 39 38 36 35 35
MAX/MIN RH                   72          41          77          45          92
RH               58 65 67 69 64 49 42 46 57 65 67 74 79 57 49 52 74 81 81 85 92
WIND DIR          W  W  W  W  W  W  W  W  W  W  W  W  W  W  W  W  W  W  W  W  W
WIND DIR DEG     26 27 27 26 26 26 26 26 25 26 26 27 27 29 28 28 26 26 27 27 26
WIND SPD          5  5  6  6  5 10 13 12 11 11 10  9  5 10 11 10  4  3  3  3  3
CLOUDS           SC FW FW FW FW FW FW SC B1 SC SC SC SC SC SC FW FW FW FW FW FW
CLOUDS(%)        34 11 12 23 12 16 24 44 64 46 28 27 26 30 34 24 13 13 13 12 11
VSBY              7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7  7
POP 12HR                      5          10           5           0           0
QPF 12HR                      0           0           0           0           0
SNOW 12HR                 00-00       00-00       00-00                        
LAL                     1     1     1     1     1     1     1     1     1     1
HAINES                  4     4     5     4     3     3     4     3     4     4
MIX HGT               400   500  5100  4600   700   600  5000  4400   400   400
T WIND DIR              W     W     W     W     W     W    NW     W     W     W
T WIND SPD              9    17    18    27    16    11    20    16     6     4
SMOKE DISP             PR    PR    GD    GD    PR    PR    GD    GD    PR    PR
ADI                     7    14    68    69    23    10    68    63     4     3
MAX LVORI               3     3     2     2     3     4     3     3     5     6
STABILITY               F     E     C     D     D     E     D     D     F     F
CEILING              7500 11700 11700 28500  4600  8300 30000 30000 23500 13800
PRESSURE            29.62 29.60 29.61 29.55 29.55 29.62 29.80 29.85 29.94 30.03


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          61    39    66    52    67    40    56    37    56
TEMP          58 49 43 40 63 59 55 53 65 53 45 41 54 46 41 38 54 46
DEWPT         38 41 39 39 44 45 45 49 48 42 35 34 35 37 35 35 38 41
MIN/MAX RH       44    96    46    83    47    76    47    90    53
RH            47 74 86 96 51 61 69 86 54 66 68 76 48 72 80 90 55 83
WIND DIR       W  W  W SW SW  S SW SW  W  N  N  N  W  E SW  W SW NW
WIND SPD       8  3  3  3  6  5  8  8 10  4  4  3  5  3  3  3  9  5
AVG CLOUDS    FW FW FW FW FW FW SC B1 B1 SC SC SC SC SC SC B1 B1 B1
POP 12HR          0     0     0    10    10     5    10    20    20
RAIN                                                        S  S  S

$$

VAZ098-220900-
Back Bay NWR RAWS-Virginia Beach VA
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