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

MDZ021-220900-
Blackwater NWR RAWS-Dorchester MD
38.42N  76.00W 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                      35          48          38          56          41
TEMP             44 42 39 36 37 42 47 46 43 41 40 39 39 48 54 54 48 45 44 43 42
DEWPT            35 34 31 28 28 30 32 34 36 36 36 37 37 38 40 39 39 38 37 37 37
MAX/MIN RH                   76          55          92          53          82
RH               70 73 72 72 71 62 56 63 76 82 85 92 92 68 58 57 72 77 76 79 81
WIND DIR          W  W  W  W  W  W  W  W  W  W NW NW NW NW  W  W  W  W  W  W  W
WIND DIR DEG     28 27 27 27 26 25 25 25 26 27 30 31 30 31 29 29 29 29 28 28 28
WIND SPD          5  6  8  8  8 11 12 13 11 11 10 10  9 12 13 12 10 10  8  8 10
CLOUDS           B1 SC SC SC FW B1 B2 B2 OV B2 B1 SC SC SC SC SC SC SC SC SC SC
CLOUDS(%)        66 40 27 29 25 54 80 86 93 77 61 49 37 39 40 37 34 31 27 29 31
VSBY              7  7  7  7  7  7  6  6  7  7  7  7  7  7  7  7  7  7  7  7  7
POP 12HR                     10          70          50           0           0
QPF 12HR                      0        0.10        0.05           0           0
SNOW 12HR                 00-00       00-00       00-00                        
RAIN                          S  C                                             
RAIN SHWRS                          L  L  C  C                                 
LAL                     1     1     1     1     1     1     1     1     1     1
HAINES                  4     3     4     3     3     4     4     4     3     4
MIX HGT               800  1100  3800  3600  2100  2000  4300  3900  1000   700
T WIND DIR              W     W     W     W     W    NW    NW     W     W     W
T WIND SPD             11    18    18    25    25    25    23    24    13    10
SMOKE DISP             PR    PR    GD    GD    FR    FR    GD    GD    PR    PR
ADI                    13    26    61    65    37    37    66    63    19    11
MAX LVORI               4     4     3     3     4     4     3     3     4     4
STABILITY               E     E     D     D     D     D     D     D     E     E
CEILING              5500  2400  6300  5000  1000  1700 23500 30000 20800 30000
PRESSURE            29.60 29.54 29.55 29.46 29.45 29.55 29.76 29.81 29.92 30.01


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    40    61    48    62    40    51    35    50
TEMP          54 47 43 41 59 54 51 49 60 50 44 41 50 42 38 36 48 41
DEWPT         37 40 39 39 43 46 45 47 42 36 32 31 31 34 32 33 34 37
MIN/MAX RH       50    92    52    93    44    70    48    86    55
RH            52 75 86 92 54 73 81 93 51 58 63 70 48 71 79 87 57 84
WIND DIR       W  W  W SW SW  S SW SW NW NW NW  N  W NW  N  N  N  N
WIND SPD      11  4  3  3  8  6 10 10 13  9  8  6 10  3  2  3  8  8
AVG CLOUDS    SC FW FW FW SC SC B1 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