160
FNCA52 TJSJ 210911
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
511 AM AST MON JUL 21 2025
DISCUSSION
RELATIVE HUMIDITY VALUES ARE FORECAST TO DROP TO AROUND CRITICAL
THRESHOLDS FOR THE SOUTHERN PORTIONS OF PUERTO RICO. ACCOMPANIED
WITH EAST TO EAST-NORTHEAST WINDS BETWEEN 15 AND 18 MPH WITH
HIGHER GUSTS, WITH VARIATIONS DUE TO SEA BREEZE. KBDI VALUES ARE
BETWEEN 613 AND 661 IN CABO ROJO AND GUANICA, RESPECTIVELY. ALL
THESE FACTORS WILL ELEVATE THE FIRE DANGER RISK TODAY ACROSS
SOUTHERN PORTIONS OF PUERTO RICO.
FIRE AND EMERGENCY OFFICIALS SHOULD BE AWARE THAT WEATHER
CONDITIONS ARE BECOMING MORE CONDUCIVE FOR THE IGNITION AND
SPREAD OF WILDFIRES.
PRZ014-220915-
SOUTHEAST COASTAL PLAINS-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 10
TEMP (24H TREND) 91 (+1) 75 (-1) 92
RH % (24H TREND) 50 (-5) 95 (+8) 56
WIND 20FT/EARLY(MPH) E 18 G22 E 12 E 17 G23
WIND 20FT/LATE(MPH) E 16 G22 E 12 E 17 G23
MIXING HGT(FT-AGL/MSL)5510 5070
TRANSPORT WND (MPH) E 16 E 21
VENT RATE (KT-FT) 77140 91260
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-220915-
SOUTHERN HILLS-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 20
TEMP (24H TREND) 88 (+4) 71 (-2) 87
RH % (24H TREND) 55 (-14) 99 (+7) 62
WIND 20FT/EARLY(MPH) E 13 NE 11 E 14
WIND 20FT/LATE(MPH) E 13 NE 11 E 14
MIXING HGT(FT-AGL/MSL)6180 5770
TRANSPORT WND (MPH) E 14 E 21
VENT RATE (KT-FT) 74160 103860
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-220915-
NORTH COASTAL PLAINS-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 50
TEMP (24H TREND) 89 (-1) 74 (-1) 90
RH % (24H TREND) 59 (-7) 99 (+6) 64
WIND 20FT/EARLY(MPH) E 19 E 18 E 20 G23
WIND 20FT/LATE(MPH) E 19 E 18 E 20 G23
MIXING HGT(FT-AGL/MSL)5310 5580
TRANSPORT WND (MPH) E 16 E 21
VENT RATE (KT-FT) 74340 100440
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-220915-
NORTHERN HILLS-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 20 50
TEMP (24H TREND) 88 (+1) 72 (0) 88
RH % (24H TREND) 62 (-6) 100 (+3) 65
WIND 20FT/EARLY(MPH) E 16 E 16 E 18
WIND 20FT/LATE(MPH) E 16 E 16 E 18
MIXING HGT(FT-AGL/MSL)6470 6980
TRANSPORT WND (MPH) E 13 E 17
VENT RATE (KT-FT) 71170 104700
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-220915-
WEST COAST-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS NONE SHOWERS
CHANCE PRECIP (%) 50 0 40
TEMP (24H TREND) 92 (+3) 72 (-1) 91
RH % (24H TREND) 54 (-12) 99 (+4) 61
WIND 20FT/EARLY(MPH) E 13 E 13 E 16 G18
WIND 20FT/LATE(MPH) E 13 E 13 E 16 G18
MIXING HGT(FT-AGL/MSL)5280 4880
TRANSPORT WND (MPH) E 10 E 15
VENT RATE (KT-FT) 47520 63440
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-220915-
EASTERN INTERIOR-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 40
TEMP (24H TREND) 88 (+1) 73 (-1) 88
RH % (24H TREND) 58 (-8) 100 (+7) 65
WIND 20FT/EARLY(MPH) E 12 E 12 E 14
WIND 20FT/LATE(MPH) E 12 E 12 E 14
MIXING HGT(FT-AGL/MSL)6240 5910
TRANSPORT WND (MPH) E 15 E 20
VENT RATE (KT-FT) 81120 100470
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-220915-
LUQUILLO MOUNTAIN RANGE-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 70 50
TEMP (24H TREND) 84 (+4) 70 (-2) 84
RH % (24H TREND) 68 (-9) 100 (+2) 76
WIND 20FT/EARLY(MPH) E 10 E 9 E 13
WIND 20FT/LATE(MPH) E 10 E 9 E 13
MIXING HGT(FT-AGL/MSL)4690 4190
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 60970 75420
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-220915-
CENTRAL MOUNTAIN RANGE-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE TSTMS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 10 50
TEMP (24H TREND) 87 (+5) 68 (-2) 86
RH % (24H TREND) 61 (-13) 100 (+3) 67
WIND 20FT/EARLY(MPH) E 10 E 11 E 11
WIND 20FT/LATE(MPH) E 10 E 11 E 11
MIXING HGT(FT-AGL/MSL)7520 7540
TRANSPORT WND (MPH) E 10 E 14
VENT RATE (KT-FT) 67680 90480
DISPERSION 5 5
DSI 5 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-220915-
CAYEY MOUNTAIN RANGE-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 20
TEMP (24H TREND) 84 (+2) 71 (-1) 83
RH % (24H TREND) 63 (-9) 100 (+2) 71
WIND 20FT/EARLY(MPH) E 10 NE 9 E 12
WIND 20FT/LATE(MPH) E 10 NE 9 E 12
MIXING HGT(FT-AGL/MSL)5320 4970
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 69160 89460
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-220915-
VIEQUES-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 70 40
TEMP (24H TREND) 89 (+1) 77 (-1) 89
RH % (24H TREND) 55 (-8) 94 (+7) 62
WIND 20FT/EARLY(MPH) E 14 G17 E 18 G21 E 17 G21
WIND 20FT/LATE(MPH) E 14 G17 E 18 G21 E 17 G21
MIXING HGT(FT-AGL/MSL)3980 3630
TRANSPORT WND (MPH) E 17 E 22
VENT RATE (KT-FT) 59700 68970
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-220915-
CULEBRA-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 70 40
TEMP (24H TREND) 91 (+2) 77 (-2) 90
RH % (24H TREND) 57 (-9) 93 (+7) 62
WIND 20FT/EARLY(MPH) E 13 G17 E 18 G22 E 17 G21
WIND 20FT/LATE(MPH) E 13 G17 E 18 G22 E 17 G21
MIXING HGT(FT-AGL/MSL)3960 3680
TRANSPORT WND (MPH) E 20 E 22
VENT RATE (KT-FT) 67320 69920
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-220915-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 10 10
TEMP (24H TREND) 93 (+3) 75 (-1) 92
RH % (24H TREND) 49 (-7) 88 (+3) 57
WIND 20FT/EARLY(MPH) SE 19 G25 E 11 SE 21 G28
WIND 20FT/LATE(MPH) SE 19 G25 E 11 SE 21 G28
MIXING HGT(FT-AGL/MSL)5570 5250
TRANSPORT WND (MPH) E 17 E 24
VENT RATE (KT-FT) 83550 110250
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-220915-
SAINT THOMAS AND SAINT JOHN-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 60 20
TEMP (24H TREND) 86 (0) 76 (-3) 87
RH % (24H TREND) 64 (-6) 96 (+10) 67
WIND 20FT/EARLY(MPH) E 14 G19 E 18 G22 E 17 G22
WIND 20FT/LATE(MPH) E 14 G19 E 18 G22 E 17 G22
MIXING HGT(FT-AGL/MSL)3680 3630
TRANSPORT WND (MPH) E 20 E 24
VENT RATE (KT-FT) 62560 76230
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-220915-
ST CROIX-
511 AM AST MON JUL 21 2025
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 20
TEMP (24H TREND) 89 (+2) 77 (-2) 88
RH % (24H TREND) 61 (-5) 95 (+9) 66
WIND 20FT/EARLY(MPH) E 13 G17 E 17 G21 E 17 G21
WIND 20FT/LATE(MPH) E 13 G17 E 17 G21 E 17 G21
MIXING HGT(FT-AGL/MSL)4460 4800
TRANSPORT WND (MPH) E 17 E 25
VENT RATE (KT-FT) 66900 105600
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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