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

MDZ022-220900-
Powellville RAWS - Wicomico MD
38.35N  75.42W Elev. 16 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                      33          48          36          56          39
TEMP             43 41 39 35 36 41 46 46 42 39 38 37 37 47 54 53 47 44 42 41 40
DEWPT            35 34 32 29 28 29 30 33 36 36 36 36 36 37 38 39 39 38 36 36 35
MAX/MIN RH                   81          53          96          54          84
RH               73 77 77 78 71 62 53 60 79 89 92 96 94 68 56 59 74 78 78 81 81
WIND DIR          W  W  W  W  W  W SW  W  W  W  W NW NW NW NW  W  W  W  W  W  W
WIND DIR DEG     29 26 27 27 26 25 24 25 25 27 28 31 30 31 30 29 28 28 28 28 27
WIND SPD          6  6  8  9  8 11 12 13 12 12 11 11 10 13 14 14 10  9  9  8  9
CLOUDS           B1 SC SC SC SC SC B2 B2 OV B2 B1 B1 SC SC SC SC SC SC FW SC SC
CLOUDS(%)        58 41 27 31 26 46 73 83 93 80 67 51 35 36 37 36 36 31 25 27 29
VSBY              7  7  7  7  7  7  6  6  7  7  7  7  7  7  7  7  7  7  7  7  7
POP 12HR                     20          70          50           0           0
QPF 12HR                      0        0.09        0.06           0           0
SNOW 12HR                 00-00       00-00       00-00                        
RAIN              S  S        S  C                                             
RAIN SHWRS                          L  L  C  C                                 
LAL                     1     1     1     1     1     1     1     1     1     1
HAINES                  3     3     4     4     3     4     4     4     3     4
MIX HGT               500   700  4500  4000  1700  1600  4400  4100   800   500
T WIND DIR              W     W     W     W     W    NW    NW     W     W     W
T WIND SPD              6    18    20    25    25    25    24    23    12     9
SMOKE DISP             PR    PR    GD    GD    PR    PR    GD    GD    PR    PR
ADI                    10    15    73    71    29    31    64    75    12    10
MAX LVORI               4     4     3     3     4     5     4     4     4     5
STABILITY               D     E     D     D     D     D     D     D     E     E
CEILING              4700  2400  5500 13800  1700  1700 30000 30000  3200 30000
PRESSURE            29.55  29.5 29.51 29.43 29.42  29.5 29.70 29.76 29.86 29.95


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    38    62    47    63    37    51    32    51
TEMP          54 46 42 39 59 54 50 48 61 49 42 38 50 41 36 33 49 41
DEWPT         37 38 38 37 42 45 45 47 44 36 32 31 31 32 31 32 35 36
MIN/MAX RH       49    92    50    94    44    75    46    92    55
RH            52 73 86 92 54 70 83 96 52 59 66 75 49 71 80 95 59 85
WIND DIR       W  W  W SW SW  S SW SW NW NW NW NW  W NW NW  N  N  N
WIND SPD      12  4  3  3  8  5 10 10 14  9  6  5 10  4  3  3  8  8
AVG CLOUDS    FW FW FW FW FW SC SC B1 B1 SC SC SC SC SC SC B1 B1 B1
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