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

MDZ025-220900-
Assateague Island RAWS - Worchester MD
38.08N  75.20W Elev. 12 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                      39          49          42          56          46
TEMP             48 45 43 41 40 45 48 48 45 44 43 43 43 50 54 54 51 49 48 47 47
DEWPT            38 37 36 34 32 33 33 36 39 39 40 40 40 40 41 41 42 41 40 40 39
MAX/MIN RH                   77          56          92          58          77
RH               67 73 75 76 72 62 57 63 77 82 87 88 88 70 60 61 74 74 73 75 74
WIND DIR          W  W  W  W  W  W  W  W  W  W  W NW NW NW NW  W  W  W  W  W  W
WIND DIR DEG     28 27 27 28 27 26 25 25 26 26 29 30 31 31 30 29 29 29 29 29 28
WIND SPD         14 13 14 14 14 14 18 20 21 21 21 20 19 19 18 20 18 17 14 14 16
CLOUDS           B1 SC SC SC SC SC B1 B2 OV B2 B1 B1 SC SC SC SC SC SC SC SC SC
CLOUDS(%)        65 45 32 37 28 39 61 77 93 80 66 51 36 34 32 32 32 29 26 26 26
VSBY              7  7  7  7  7  7  6  6  6  6  7  7  7  7  7  7  7  7  7  7  7
POP 12HR                     20          60          60           5           0
QPF 12HR                      0        0.06        0.08           0           0
SNOW 12HR                 00-00       00-00       00-00                        
RAIN              S  S        S  S                                             
RAIN SHWRS                          L  L  L  L                                 
LAL                     1     1     1     1     1     1     1     1     1     1
HAINES                  4     3     4     4     3     3     4     4     4     4
MIX HGT              3500  3300  4700  4500  3400  3400  4200  4300  3800  2800
T WIND DIR              W     W     W     W     W    NW    NW     W    NW     W
T WIND SPD             20    19    20    27    32    31    25    27    25    21
SMOKE DISP             GD    GD    VG    GD    GD    GD    GD    VG    GD    FR
ADI                    32    44    74    77    44    68    65    87    37    47
MAX LVORI               3     3     3     3     4     4     3     3     3     3
STABILITY               D     D     D     D     D     D     D     D     D     D
CEILING              4700  3500  4700  7200  2400  1700 30000 30000  9600 30000
PRESSURE            29.59 29.54 29.55 29.48 29.46 29.52 29.75 29.80 29.90  30.0


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          56    47    60    52    61    44    51    41    53
TEMP          55 51 49 48 59 56 54 52 60 52 47 44 50 46 43 42 52 47
DEWPT         40 41 43 42 45 49 50 50 46 40 36 35 34 36 36 37 38 40
MIN/MAX RH       54    83    60    93    53    69    54    80    57
RH            55 68 80 81 61 76 85 93 60 63 65 71 55 69 75 80 58 76
WIND DIR       W  W  W  W SW  S SW SW NW NW NW  N  W NW NW NW  N  N
WIND SPD      16 10  9  8 10 11 16 16 17 12 12 10 12 12 10 10 10 12
AVG CLOUDS    FW FW FW FW FW SC B1 B1 B1 SC SC SC SC SC B1 B1 B1 B2
POP 12HR          0     0     0    10    10     5    10    20    30
RAIN                                                     S  S  S  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