315
FNCA52 TJSJ 260918
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
518 AM AST WED NOV 26 2025
DISCUSSION
PASSING SHOWERS WILL REACH WINDWARD LOCATIONS DURING THE MORNING
AND AFTERNOON ISOLATED SHOWERS ARE EXPECTED TO DEVELOP MAINLY OVER
INTERIOR TO SOUTHWESTERN PUERTO RICO. WINDS WILL BE MAINLY FROM
THE EAST AT AROUND 12 TO 18 MPH, WITH HIGHER GUSTS AND SEA BREEZE
FLUCTUATIONS, INCREASING OVER THE NEXT FEW DAYS. RH VALUES WILL
BE NEAR THE CRITICAL VALUES ALONG THE SOUTHERN SLOPES AND PLAINS
OF PR. EXPECT A SIMILAR TREND OVER THE NEXT DAYS. LOW TO LOCALLY
MODERATE RISK OF FIRE WEATHER TODAY.
PRZ014-270930-
SOUTHEAST COASTAL PLAINS-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 0 30
TEMP (24H TREND) 86 (0) 72 (0) 89
RH % (24H TREND) 57 (+4) 89 (-1) 58
WIND 20FT/EARLY(MPH) E 18 G23 NE 13 E 18 G23
WIND 20FT/LATE(MPH) E 18 G23 NE 13 E 18 G23
MIXING HGT(FT-AGL/MSL)5120 6150
TRANSPORT WND (MPH) E 20 E 20
VENT RATE (KT-FT) 87040 104550
DISPERSION 5 5
DSI 6 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-270930-
SOUTHERN HILLS-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 30
TEMP (24H TREND) 84 (+3) 67 (-2) 85
RH % (24H TREND) 60 (-5) 95 (+1) 61
WIND 20FT/EARLY(MPH) E 14 NE 13 E 14
WIND 20FT/LATE(MPH) E 14 NE 13 E 14
MIXING HGT(FT-AGL/MSL)5320 6250
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 85120 106250
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-270930-
NORTH COASTAL PLAINS-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 50 40
TEMP (24H TREND) 86 (+1) 72 (0) 88
RH % (24H TREND) 62 (-4) 94 (+1) 62
WIND 20FT/EARLY(MPH) E 19 G22 E 18 E 19
WIND 20FT/LATE(MPH) E 19 G22 E 18 E 19
MIXING HGT(FT-AGL/MSL)4800 5540
TRANSPORT WND (MPH) E 20 E 21
VENT RATE (KT-FT) 81600 99720
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-270930-
NORTHERN HILLS-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 20
TEMP (24H TREND) 84 (+1) 68 (-1) 86
RH % (24H TREND) 63 (-3) 95 (-1) 62
WIND 20FT/EARLY(MPH) E 18 E 16 E 17
WIND 20FT/LATE(MPH) E 18 E 16 E 17
MIXING HGT(FT-AGL/MSL)5040 5820
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 80640 93120
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-270930-
WEST COAST-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 10 40
TEMP (24H TREND) 87 (0) 68 (0) 88
RH % (24H TREND) 59 (-5) 96 (-1) 61
WIND 20FT/EARLY(MPH) E 16 E 17 E 16
WIND 20FT/LATE(MPH) E 16 E 17 E 16
MIXING HGT(FT-AGL/MSL)4920 5040
TRANSPORT WND (MPH) E 14 E 13
VENT RATE (KT-FT) 59040 55440
DISPERSION 5 5
DSI 5 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-270930-
EASTERN INTERIOR-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 40
TEMP (24H TREND) 86 (+3) 70 (0) 85
RH % (24H TREND) 62 (-5) 96 (0) 64
WIND 20FT/EARLY(MPH) E 13 E 14 E 13
WIND 20FT/LATE(MPH) E 13 E 14 E 13
MIXING HGT(FT-AGL/MSL)4950 5750
TRANSPORT WND (MPH) E 18 E 18
VENT RATE (KT-FT) 79200 92000
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-270930-
LUQUILLO MOUNTAIN RANGE-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 50 50
TEMP (24H TREND) 81 (+4) 67 (-2) 81
RH % (24H TREND) 66 (-8) 100 (+2) 71
WIND 20FT/EARLY(MPH) E 12 E 11 E 12
WIND 20FT/LATE(MPH) E 12 E 11 E 12
MIXING HGT(FT-AGL/MSL)4230 4140
TRANSPORT WND (MPH) E 20 E 17
VENT RATE (KT-FT) 71910 62100
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-270930-
CENTRAL MOUNTAIN RANGE-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 30
TEMP (24H TREND) 83 (+4) 65 (-1) 84
RH % (24H TREND) 62 (-6) 96 (-2) 62
WIND 20FT/EARLY(MPH) E 13 E 13 E 12
WIND 20FT/LATE(MPH) E 13 E 13 E 12
MIXING HGT(FT-AGL/MSL)5300 6430
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 74200 83590
DISPERSION 5 5
DSI 5 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-270930-
CAYEY MOUNTAIN RANGE-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 40
TEMP (24H TREND) 80 (+2) 67 (-1) 81
RH % (24H TREND) 65 (-5) 98 (0) 69
WIND 20FT/EARLY(MPH) E 13 E 11 E 13
WIND 20FT/LATE(MPH) E 13 E 11 E 13
MIXING HGT(FT-AGL/MSL)4870 5110
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 87660 97090
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-270930-
VIEQUES-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 50 50
TEMP (24H TREND) 86 (+1) 74 (0) 86
RH % (24H TREND) 57 (-8) 92 (+3) 62
WIND 20FT/EARLY(MPH) E 16 G21 E 18 G23 E 17 G21
WIND 20FT/LATE(MPH) E 16 G21 E 18 G23 E 17 G21
MIXING HGT(FT-AGL/MSL)4100 4560
TRANSPORT WND (MPH) E 22 E 23
VENT RATE (KT-FT) 77900 91200
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-270930-
CULEBRA-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 40
TEMP (24H TREND) 88 (+2) 74 (-2) 87
RH % (24H TREND) 56 (-9) 95 (+6) 59
WIND 20FT/EARLY(MPH) E 16 G21 E 18 G23 E 17 G21
WIND 20FT/LATE(MPH) E 16 G21 E 18 G23 E 17 G21
MIXING HGT(FT-AGL/MSL)4080 4550
TRANSPORT WND (MPH) E 23 E 24
VENT RATE (KT-FT) 81600 95550
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-270930-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 0 20
TEMP (24H TREND) 88 (+1) 70 (-1) 90
RH % (24H TREND) 56 (+3) 93 (+2) 57
WIND 20FT/EARLY(MPH) E 21 G28 E 18 G23 E 21 G27
WIND 20FT/LATE(MPH) E 21 G28 E 18 G23 E 21 G27
MIXING HGT(FT-AGL/MSL)5510 6170
TRANSPORT WND (MPH) E 16 E 17
VENT RATE (KT-FT) 77140 92550
DISPERSION 5 5
DSI 5 3 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-270930-
SAINT THOMAS AND SAINT JOHN-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 40
TEMP (24H TREND) 86 (+2) 71 (-4) 86
RH % (24H TREND) 61 (-6) 100 (+11) 63
WIND 20FT/EARLY(MPH) E 17 G21 E 19 G24 E 17 G22
WIND 20FT/LATE(MPH) E 17 G21 E 19 G24 E 17 G22
MIXING HGT(FT-AGL/MSL)3990 4470
TRANSPORT WND (MPH) E 23 E 24
VENT RATE (KT-FT) 79800 93870
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-270930-
ST CROIX-
518 AM AST WED NOV 26 2025
TODAY TONIGHT THU
CLOUD COVER CLEAR PCLDY PCLDY
PRECIP TYPE NONE SHOWERS SHOWERS
CHANCE PRECIP (%) 0 20 30
TEMP (24H TREND) 88 (+3) 73 (-3) 86
RH % (24H TREND) 57 (-9) 91 (+4) 65
WIND 20FT/EARLY(MPH) E 16 G20 E 18 G21 E 17 G21
WIND 20FT/LATE(MPH) E 16 G20 E 18 G21 E 17 G21
MIXING HGT(FT-AGL/MSL)4710 4830
TRANSPORT WND (MPH) E 22 E 24
VENT RATE (KT-FT) 89490 101430
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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