458
FNCA52 TJSJ 080823
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
423 AM AST WED OCT 8 2025
DISCUSSION
LINGERING MOISTURE FROM A TROPICAL WAVE WILL CONTINUE TO MOVE
OVER THE REGION TODAY, PROMOTING ANOTHER ROUND OF HEAVY SHOWERS
AND THUNDERSTORM ACTIVITY, PARTICULARLY OVER THE CENTRAL MOUNTAIN
RANGE; AND PORTIONS OF WESTERN AND SOUTHERN PUERTO RICO. WINDS
WILL PREVAIL FROM THE SOUTHEAST AT 10 TO 15 MPH ACROSS THE AREA.
RELATIVE HUMIDITY VALUES WILL REMAIN ABOVE THRESHOLDS OVER THE
SOUTHERN COASTAL PLAINS OF PUERTO RICO (60-65%) DUE TO ABUNDANT
MOISTURE ACROSS THE AREA. AT THIS TIME, THE FIRE DANGER THREAT
WILL REMAIN LOW TODAY.
PRZ014-090830-
SOUTHEAST COASTAL PLAINS-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 30
TEMP (24H TREND) 91 (+1) 74 (-2) 91
RH % (24H TREND) 63 (-3) 95 (+3) 62
WIND 20FT/EARLY(MPH) SE 8 E 8 SE 8
WIND 20FT/LATE(MPH) SE 8 E 8 SE 8
MIXING HGT(FT-AGL/MSL)4240 4320
TRANSPORT WND (MPH) SE 8 SE 9
VENT RATE (KT-FT) 29680 34560
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-090830-
SOUTHERN HILLS-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 30 50
TEMP (24H TREND) 88 (+2) 70 (-3) 88
RH % (24H TREND) 65 (-4) 99 (+6) 64
WIND 20FT/EARLY(MPH) SE 8 E 8 SE 8
WIND 20FT/LATE(MPH) SE 8 E 8 SE 8
MIXING HGT(FT-AGL/MSL)4880 4960
TRANSPORT WND (MPH) SE 8 SE 9
VENT RATE (KT-FT) 34160 39680
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-090830-
NORTH COASTAL PLAINS-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 20 50
TEMP (24H TREND) 91 (+2) 74 (-1) 91
RH % (24H TREND) 63 (-7) 99 (+3) 64
WIND 20FT/EARLY(MPH) E 12 SE 10 E 9
WIND 20FT/LATE(MPH) E 12 SE 10 E 9
MIXING HGT(FT-AGL/MSL)4360 4780
TRANSPORT WND (MPH) SE 6 S 7
VENT RATE (KT-FT) 21800 28680
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-090830-
NORTHERN HILLS-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 60 30 60
TEMP (24H TREND) 90 (+3) 71 (-2) 89
RH % (24H TREND) 65 (-5) 99 (+2) 67
WIND 20FT/EARLY(MPH) NE 9 SE 5 NE 5
WIND 20FT/LATE(MPH) NE 9 SE 5 NE 5
MIXING HGT(FT-AGL/MSL)4930 5100
TRANSPORT WND (MPH) SE 5 S 6
VENT RATE (KT-FT) 19720 25500
DISPERSION 5 5
DSI 5 1 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-090830-
WEST COAST-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 20 20 60
TEMP (24H TREND) 91 (0) 74 (-1) 91
RH % (24H TREND) 64 (-3) 98 (+3) 64
WIND 20FT/EARLY(MPH) SE 11 E 10 SE 10
WIND 20FT/LATE(MPH) SE 11 E 10 SE 10
MIXING HGT(FT-AGL/MSL)4420 4490
TRANSPORT WND (MPH) SE 9 SE 9
VENT RATE (KT-FT) 35360 35920
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-090830-
EASTERN INTERIOR-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 30 40 40
TEMP (24H TREND) 89 (+2) 71 (-3) 89
RH % (24H TREND) 65 (-5) 100 (+2) 65
WIND 20FT/EARLY(MPH) SE 11 SE 11 SE 9
WIND 20FT/LATE(MPH) SE 11 SE 11 SE 9
MIXING HGT(FT-AGL/MSL)4950 5380
TRANSPORT WND (MPH) SE 9 SE 8
VENT RATE (KT-FT) 39600 37660
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-090830-
LUQUILLO MOUNTAIN RANGE-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 50 50
TEMP (24H TREND) 86 (+4) 70 (-2) 86
RH % (24H TREND) 69 (-7) 100 (0) 68
WIND 20FT/EARLY(MPH) SE 10 SE 9 SE 8
WIND 20FT/LATE(MPH) SE 10 SE 9 SE 8
MIXING HGT(FT-AGL/MSL)4190 4390
TRANSPORT WND (MPH) SE 9 SE 9
VENT RATE (KT-FT) 33520 35120
DISPERSION 5 5
DSI 5 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-090830-
CENTRAL MOUNTAIN RANGE-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 30 60
TEMP (24H TREND) 87 (+4) 69 (-3) 87
RH % (24H TREND) 67 (-6) 98 (+3) 67
WIND 20FT/EARLY(MPH) SE 8 SE 6 SE 6
WIND 20FT/LATE(MPH) SE 8 SE 6 SE 6
MIXING HGT(FT-AGL/MSL)5630 5570
TRANSPORT WND (MPH) SE 6 SE 7
VENT RATE (KT-FT) 28150 33420
DISPERSION 5 5
DSI 5 1 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-090830-
CAYEY MOUNTAIN RANGE-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 30
TEMP (24H TREND) 85 (+1) 70 (-2) 85
RH % (24H TREND) 69 (-3) 100 (+1) 68
WIND 20FT/EARLY(MPH) SE 8 SE 6 SE 6
WIND 20FT/LATE(MPH) SE 8 SE 6 SE 6
MIXING HGT(FT-AGL/MSL)4620 4870
TRANSPORT WND (MPH) SE 8 SE 9
VENT RATE (KT-FT) 32340 38960
DISPERSION 5 5
DSI 5 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-090830-
VIEQUES-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 50 50
TEMP (24H TREND) 90 (+1) 76 (-1) 90
RH % (24H TREND) 62 (-3) 96 (-1) 61
WIND 20FT/EARLY(MPH) SE 13 SE 13 G17 E 8
WIND 20FT/LATE(MPH) SE 13 SE 13 G17 E 8
MIXING HGT(FT-AGL/MSL)3410 2840
TRANSPORT WND (MPH) SE 15 SE 7
VENT RATE (KT-FT) 44330 17040
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-090830-
CULEBRA-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 50 50
TEMP (24H TREND) 92 (+2) 77 (-1) 92
RH % (24H TREND) 59 (-7) 98 (+3) 58
WIND 20FT/EARLY(MPH) SE 14 G18 SE 14 G18 E 9
WIND 20FT/LATE(MPH) SE 14 G18 SE 14 G18 E 9
MIXING HGT(FT-AGL/MSL)3390 2860
TRANSPORT WND (MPH) SE 14 SE 18
VENT RATE (KT-FT) 40680 45760
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-090830-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 20 40
TEMP (24H TREND) 92 (+1) 75 (-2) 91
RH % (24H TREND) 61 (-1) 93 (+3) 60
WIND 20FT/EARLY(MPH) SE 12 E 13 SE 12 G17
WIND 20FT/LATE(MPH) SE 12 E 13 SE 12 G17
MIXING HGT(FT-AGL/MSL)4550 4500
TRANSPORT WND (MPH) SE 10 SE 13
VENT RATE (KT-FT) 40950 49500
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-090830-
SAINT THOMAS AND SAINT JOHN-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 50 50 50
TEMP (24H TREND) 87 (+1) 75 (-3) 88
RH % (24H TREND) 66 (-5) 100 (+4) 65
WIND 20FT/EARLY(MPH) SE 14 G19 SE 14 G19 E 12
WIND 20FT/LATE(MPH) SE 14 G19 SE 14 G19 E 12
MIXING HGT(FT-AGL/MSL)3390 3340
TRANSPORT WND (MPH) SE 17 E 18
VENT RATE (KT-FT) 50850 53440
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-090830-
ST CROIX-
423 AM AST WED OCT 8 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 50 60
TEMP (24H TREND) 89 (+1) 77 (-1) 90
RH % (24H TREND) 66 (-4) 99 (+3) 63
WIND 20FT/EARLY(MPH) SE 14 G17 E 14 G17 E 12
WIND 20FT/LATE(MPH) SE 14 G17 E 14 G17 E 12
MIXING HGT(FT-AGL/MSL)4390 4250
TRANSPORT WND (MPH) E 14 SE 14
VENT RATE (KT-FT) 52680 51000
DISPERSION 5 5
DSI 5 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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