609
FNCA52 TJSJ 200846
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
446 AM AST MON JUL 20 2026
DISCUSSION
ELEVATED FIRE WEATHER CONDITIONS WILL PERSIST TODAY ACROSS PORTIONS
OF PUERTO RICO, PARTICULARLY ALONG THE SOUTHERN COASTAL PLAINS AND
ADJACENT LOWER ELEVATIONS. DESPITE PATCHES OF LOW-LEVEL MOISTURE
MOVING ACROSS THE REGION, RELATIVE HUMIDITY VALUES WILL CONTINUE TO
DROP INTO THE UPPER 40S TO LOWER 50S THIS AFTERNOON, WHILE BREEZY
EASTERLY WINDS OF 15 TO 20 MPH WITH HIGHER GUSTS PROMOTE FAVORABLE
CONDITIONS FOR RAPID FIRE SPREAD.
RECENT OBSERVATIONS INDICATE THAT CRITICALLY DRY FUELS REMAIN IN
PLACE, WITH KBDI VALUES EXCEEDING 700 ACROSS MUCH OF PUERTO RICO AND
PERSISTENT RAINFALL DEFICITS MAINTAINING VEGETATION STRESS. ALTHOUGH
LOCALIZED SHOWERS ARE EXPECTED EACH AFTERNOON, WIDESPREAD BENEFICIAL
RAINFALL IS NOT ANTICIPATED THROUGH THE WEEKEND, AND LITTLE
IMPROVEMENT IN FIRE WEATHER CONDITIONS IS EXPECTED. THEREFORE, AN
ELEVATED FIRE DANGER WILL CONTINUE ACROSS SOUTHERN PUERTO RICO,
WHERE A FIRE DANGER STATEMENT IS IN EFFECT.
PRZ014-202015-
SOUTHEAST COASTAL PLAINS-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE NONE NONE SHOWERS
CHANCE PRECIP (%) 0 0 40
TEMP (24H TREND) 92 (+1) 73 (-4) 92
RH % (24H TREND) 46 (-4) 87 (+4) 46
WIND 20FT/EARLY(MPH) E 13 NE 13 G21 NE 11
WIND 20FT/LATE(MPH) E 18 G27 NE 8 E 14 G23
MIXING HGT(FT-AGL/MSL)5510 5720
TRANSPORT WND (MPH) E 16 E 10
VENT RATE (KT-FT) 77140 51480
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-202015-
SOUTHERN HILLS-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 0 50
TEMP (24H TREND) 90 (+3) 69 (-5) 90
RH % (24H TREND) 56 (-2) 96 (+7) 57
WIND 20FT/EARLY(MPH) E 13 NE 11 NE 10
WIND 20FT/LATE(MPH) E 14 NE 10 E 13
MIXING HGT(FT-AGL/MSL)6230 6200
TRANSPORT WND (MPH) E 13 NE 10
VENT RATE (KT-FT) 68530 55800
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-202015-
NORTH COASTAL PLAINS-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 40
TEMP (24H TREND) 91 (+1) 73 (-4) 91
RH % (24H TREND) 57 (-3) 95 (+6) 61
WIND 20FT/EARLY(MPH) E 17 E 16 E 13
WIND 20FT/LATE(MPH) NE 19 E 11 NE 14
MIXING HGT(FT-AGL/MSL)4740 4790
TRANSPORT WND (MPH) E 18 NE 14
VENT RATE (KT-FT) 75840 57480
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-202015-
NORTHERN HILLS-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 40
TEMP (24H TREND) 89 (0) 71 (-3) 89
RH % (24H TREND) 60 (+1) 97 (+4) 65
WIND 20FT/EARLY(MPH) E 14 E 13 E 12
WIND 20FT/LATE(MPH) NE 17 E 9 NE 12
MIXING HGT(FT-AGL/MSL)5970 5320
TRANSPORT WND (MPH) E 13 NE 14
VENT RATE (KT-FT) 65670 63840
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-202015-
WEST COAST-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 40 50
TEMP (24H TREND) 92 (+1) 71 (-3) 93
RH % (24H TREND) 59 (-2) 98 (+8) 56
WIND 20FT/EARLY(MPH) E 13 E 16 E 12
WIND 20FT/LATE(MPH) E 13 E 13 SE 16
MIXING HGT(FT-AGL/MSL)4860 4920
TRANSPORT WND (MPH) E 7 NE 9
VENT RATE (KT-FT) 29160 39360
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-202015-
EASTERN INTERIOR-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 20 50
TEMP (24H TREND) 90 (+2) 71 (-4) 91
RH % (24H TREND) 56 (-2) 95 (+5) 58
WIND 20FT/EARLY(MPH) E 13 NE 12 NE 10
WIND 20FT/LATE(MPH) E 13 NE 9 NE 11
MIXING HGT(FT-AGL/MSL)6570 6760
TRANSPORT WND (MPH) E 14 NE 13
VENT RATE (KT-FT) 78840 74360
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-202015-
LUQUILLO MOUNTAIN RANGE-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 60
TEMP (24H TREND) 86 (+5) 69 (-4) 86
RH % (24H TREND) 63 (-6) 98 (+5) 65
WIND 20FT/EARLY(MPH) E 12 NE 10 NE 8
WIND 20FT/LATE(MPH) E 12 NE 6 NE 10
MIXING HGT(FT-AGL/MSL)4730 5060
TRANSPORT WND (MPH) E 15 E 13
VENT RATE (KT-FT) 61490 55660
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-202015-
CENTRAL MOUNTAIN RANGE-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 10 50
TEMP (24H TREND) 88 (+3) 67 (-4) 87
RH % (24H TREND) 63 (+1) 99 (+5) 67
WIND 20FT/EARLY(MPH) E 10 NE 13 NE 11
WIND 20FT/LATE(MPH) NE 11 E 10 NE 11
MIXING HGT(FT-AGL/MSL)7310 6400
TRANSPORT WND (MPH) E 9 NE 13
VENT RATE (KT-FT) 58480 70400
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-202015-
CAYEY MOUNTAIN RANGE-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 10 40
TEMP (24H TREND) 86 (+3) 69 (-4) 87
RH % (24H TREND) 62 (-2) 99 (+3) 64
WIND 20FT/EARLY(MPH) E 11 NE 10 NE 10
WIND 20FT/LATE(MPH) E 12 NE 8 NE 11
MIXING HGT(FT-AGL/MSL)5530 6310
TRANSPORT WND (MPH) E 15 NE 14
VENT RATE (KT-FT) 71890 75720
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-202015-
VIEQUES-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 60
TEMP (24H TREND) 90 (+1) 78 (-2) 90
RH % (24H TREND) 57 (-2) 84 (+1) 56
WIND 20FT/EARLY(MPH) E 17 NE 16 NE 10
WIND 20FT/LATE(MPH) E 14 NE 12 NE 11
MIXING HGT(FT-AGL/MSL)3380 3240
TRANSPORT WND (MPH) E 17 NE 14
VENT RATE (KT-FT) 50700 38880
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-202015-
CULEBRA-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 60
TEMP (24H TREND) 90 (+2) 77 (-3) 91
RH % (24H TREND) 58 (-6) 87 (+4) 59
WIND 20FT/EARLY(MPH) E 16 NE 16 NE 11
WIND 20FT/LATE(MPH) E 14 NE 12 NE 11
MIXING HGT(FT-AGL/MSL)3360 3220
TRANSPORT WND (MPH) E 18 E 14
VENT RATE (KT-FT) 53760 38640
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-202015-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 20 70
TEMP (24H TREND) 92 (+1) 72 (-4) 93
RH % (24H TREND) 50 (-3) 91 (+10) 45
WIND 20FT/EARLY(MPH) E 14 G22 E 12 E 12
WIND 20FT/LATE(MPH) E 17 NE 12 S 16
MIXING HGT(FT-AGL/MSL)5490 4670
TRANSPORT WND (MPH) E 12 SE 6
VENT RATE (KT-FT) 54900 23350
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-202015-
SAINT THOMAS AND SAINT JOHN-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 60
TEMP (24H TREND) 87 (+1) 76 (-3) 89
RH % (24H TREND) 60 (-4) 89 (+5) 61
WIND 20FT/EARLY(MPH) E 17 NE 14 NE 11
WIND 20FT/LATE(MPH) E 14 NE 12 NE 11
MIXING HGT(FT-AGL/MSL)3370 3150
TRANSPORT WND (MPH) E 21 E 13
VENT RATE (KT-FT) 60660 34650
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-202015-
ST CROIX-
446 AM AST MON JUL 20 2026
TODAY TONIGHT TUE
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 20 40
TEMP (24H TREND) 89 (+1) 77 (-2) 89
RH % (24H TREND) 60 (-4) 86 (0) 60
WIND 20FT/EARLY(MPH) E 16 NE 13 NE 10
WIND 20FT/LATE(MPH) E 14 NE 11 NE 11
MIXING HGT(FT-AGL/MSL)4560 4890
TRANSPORT WND (MPH) E 18 E 13
VENT RATE (KT-FT) 72960 53790
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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