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The Navy Corpus Point Forecast Matrix

27.68N  97.28W ELEV. 11 FT
318 AM CDT THU OCT 3 2013

DATE             THU 10/03/13            FRI 10/04/13            SAT 10/05/13
CDT 3HRLY     04 07 10 13 16 19 22 01 04 07 10 13 16 19 22 01 04 07 10 13 16 19
UTC 3HRLY     09 12 15 18 21 00 03 06 09 12 15 18 21 00 03 06 09 12 15 18 21 00

MAX/MIN                      89          77          90          78          89
TEMP          78 77 82 88 88 83 80 79 77 77 82 89 89 84 81 81 78 78 83 88 88 81
DEWPT         76 76 75 74 74 75 75 75 74 74 74 73 74 73 75 74 74 74 74 73 73 73
RH            94 97 79 63 63 77 85 88 90 90 77 59 61 70 82 79 88 88 74 61 61 77
WIND DIR       S  S  S SE SE SE SE SE  S  S  S SE SE SE SE  S  S  S  S SE  E  E
WIND SPD      13 11 10 13 16 16 16 14 11  8  6 10 13 13 13 12 10  8  6  8 14 13
CLOUDS        SC B1 SC SC SC FW SC SC SC SC SC FW FW FW FW SC SC B1 SC SC SC SC
POP 12HR                     20           5           5           5           5
QPF 12HR                      0           0           0           0           0
RAIN SHWRS     S  S  S                                                        C
TSTMS                S                                                        S
HEAT INDEX          89 96 97 90 85          88 97 98 91 88 86       89 96 96 86
MAX HEAT               96    98    87          97    99    89    80    96    98


DATE          SUN 10/06/13  MON 10/07/13  TUE 10/08/13  WED 10/09/13
CDT 6HRLY     01 07 13 19   01 07 13 19   01 07 13 19   01 07 13 19
UTC 6HRLY     06 12 18 00   06 12 18 00   06 12 18 00   06 12 18 00

MIN/MAX          70    78      67    83      67    86      72    87
TEMP          79 70 78 74   69 67 81 76   71 67 84 80   75 72 86 82
DEWPT         70 58 56 52   50 50 50 52   57 58 63 65   68 67 70 70
PWIND DIR        NE     N       N    NE       E     E      SE    SE
WIND CHAR        GN    BZ      GN    GN      LT    LT      GN    GN
AVG CLOUDS    B1 B2 B2 B1   SC SC FW FW   CL CL CL FW   FW SC SC SC
POP 12HR         40    20       0     0       0     0       5     5
RAIN SHWRS     C  C  S
TSTMS          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.