NWS

The Tilden Point Forecast Matrix

28.45N  98.54W ELEV. 273 FT
325 PM CST SUN MAR 3 2013

DATE           03/03/13      MON 03/04/13            TUE 03/05/13            WED
CST 3HRLY     15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06
UTC 3HRLY     21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12

MIN/MAX                      52          88          53          70          39
TEMP             71 60 57 54 52 64 82 88 79 64 59 55 55 56 64 68 65 54 49 44 41
DEWPT            35 42 44 46 48 50 48 43 40 46 50 52 49 42 35 30 26 24 22 21 20
RH               27 51 62 74 86 60 31 21 25 52 72 90 80 59 34 24 23 31 34 39 42
WIND DIR          S SE  S  S  S  S  S  S  S  S  S  S NW  N  N  N  N NE NE NE NE
WIND SPD         14 17 16 12 10 12 13 13  8 13 12  6  9 17 20 18 13 10  9  8  6
CLOUDS           FW FW FW FW FW FW SC SC SC FW FW FW FW FW FW CL CL CL CL FW FW
POP 12HR                      0           0           0           0           0
QPF 12HR                      0           0           0           0           0


DATE           03/06/13  THU 03/07/13  FRI 03/08/13  SAT 03/09/13  SUN 03/10/13
CST 6HRLY     12 18 00   06 12 18 00   06 12 18 00   06 12 18 00   06 12 18
UTC 6HRLY     18 00 06   12 18 00 06   12 18 00 06   12 18 00 06   12 18 00

MAX/MIN          68      42    72      52    74      58    77      61    77
TEMP          60 63 48   44 64 68 56   54 68 70 61   59 71 74 65   62 72 73
DEWPT         19 23 29   34 42 47 50   53 57 56 57   58 59 60 62   62 64 35
PWIND DIR        NE       E    SE      SE    SE      SE    SE       S    NW
WIND CHAR        GN      LT    GN      GN    GN      GN    BZ      GN    GN
AVG CLOUDS    FW FW SC   SC SC SC B1   B1 B1 B1 B1   B2 B2 B2 B1   B1 B1 B1
POP 12HR          0       0     5      10    10      10    10      20    20
RAIN SHWRS                                                     S    S  S  S
TSTMS                                                          S    S  S  S


THE TABLE OF CODES BELOW DESCRIBE THE PFM PRODUCT:
THE FOLLOWING PARAMETERS APPEAR DAILY... MAX/MIN = DAYTIME HIGH AND NIGHTTIME LOW TEMPERATURE TEMP = TEMPERATURE AT 3 HOURLY INTERVALS DEWPT = DEWPOINT AT 3 HOURLY INTERVALS RH = RELATIVE HUMIDITY AT 3 HOURLY INTERVALS WIND DIR = WIND DIRECTION AT 3 HOURLY INTERVALS WIND SPD = WIND SPEED IN MPH AT 3 HOURLY INTERVALS CLOUDS = CLOUD COVER AT 3 HOURLY INTERVALS CL = CLEAR SKIES (0-5% CLOUD COVER) FW = MOSTLY CLEAR SKIES (6-25% CLOUD COVER) SC = PARTLY CLOUDY SKIES (26-50% CLOUD COVER) B1 = MOSTLY CLOUDY SKIES (51-69% CLOUD COVER) B2 = MOSTLY CLOUDY SKIES (70-87% CLOUD COVER) OV = CLOUDY SKIES (88-100% CLOUD COVER) POP 12HR = PROBABILITY OF PRECIPITATION FOR DAY AND NIGHT QPF 12HR = PRECIPITATION AMOUNT IN INCHES FOR DAY AND NIGHT THE FOLLOWING PARAMETERS APPEAR AS NEEDED... WIND GUST = WIND GUST IN MPH AT 3 HOURLY INTERVALS MAX QPF = MAXIMUM AMOUNT OF PRECIPITATION OCCURRING AT ANY ONE LOCATION SNOW 12HR = SNOWFALL AMOUNT IN INCHES FOR DAY AND NIGHT WIND CHILL = HOW IT FEELS BASED ON TEMPERATURE AND WIND EACH 3 HOURS MIN CHILL = LOWEST WIND CHILL OVER LAST 6 HOUR PERIOD HEAT INDEX = HOW IT FEELS BASED ON TEMPERATURE AND RH EACH 3 HOURS MAX HEAT = HIGHEST HEAT INDEX OVER LAST 6 HOUR PERIOD RAIN = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS RAIN RAIN SHWRS = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS RAIN SHOWERS SPRINKLES = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS SPRINKLES TSTMS = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS THUNDERSTORMS DRIZZLE = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS DRIZZLE SNOW = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS SNOW SNOWSHWRS = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS SNOW SHOWERS FLURRIES = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS FLURRIES SLEET = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS ICE PELLETS FRZG RAIN = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS FREEZING RAIN FRZG DRZL = PRECIPITATION TYPE FOR EACH 3 HOUR PERIOD IS FREEZING DRIZZLE EACH PRECIPITATION PARAMETER IS CLASSIFIED AS FOLLOWS... IS = ISOLATED (10-20% COVERAGE) S = SLIGHT (10-20% PROBABILITY) SC = SCATTERED (30-50% COVERAGE) C = CHANCE (30-50% PROBABILITY) NM = NUMEROUS (60-70% COVERAGE) L = LIKELY (60-70% PROBABILITY) O = OCCASIONAL (80-100% PROBABILITY) D = DEFINITE (80-100% PROBABILITY) EC = EXTENSIVE COVERAGE (80-100% PROBABILITY) PA = PATCHY (<25% COVERAGE) AR = AREAS (25-50% COVERAGE) WD = WIDESPREAD (>50% COVERAGE) OBSTRUCTIONS TO VISIBILITY (OBVIS) ARE CLASSIFIED AS FOLLOWS... F = FOG PF = PATCHY FOG F+ = DENSE FOG PF+ = PATCHY DENSE FOG H = HAZE BS = BLOWING SNOW BD = BLOWING DUST AF = VOLCANIC ASH K = SMOKE ADDITIONAL EXTENDED FORECAST PARAMETERS ARE CLASSIFIED AS FOLLOWS... PWIND DIR = PRIMARY WIND DIRECTION FOR EACH 12 HOUR PERIOD WIND CHAR = WIND CHARACTERISTIC FOR EACH 12 HOUR PERIOD LT = LIGHT (< 8 MPH) GN = GENTLE (8-14 MPH) BZ = BREEZY (15-22 MPH) WY = WINDY (23-30 MPH) VW = VERY WINDY (31-39 MPH) SD = STRONG (>40 MPH) AVG CLOUDS = AVERAGE CLOUD COVER FOR EACH 12 HOUR PERIOD MM = MISSING DATA IF A HURRICANE IS EXPECTED THEN THE FOLLOWING APPLIES... 0-24 HOURS BEFORE LANDFALL...THE ACTUAL WIND SPEEDS WILL BE USED. 25-60 HOURS BEFORE LANDFALL...THE CODE "HU" WILL BE USED FOR WINDS AND "HG" FOR WIND GUSTS. 61-120 HOURS BEFORE LANDFALL...THE CODE "HU" WILL ONLY BE USED.

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  • Page last modified: 26-Jan-2013 1:46 AM UTC