850
FNCA52 TJSJ 171930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST SUN MAY 17 2026
DISCUSSION
NO FIRE DANGER IS EXPECTED TODAY.
PRZ014-180800-
SOUTHEAST COASTAL PLAINS-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 10 10
TEMP (24H TREND) 72 (-3) 90 (+2) 72 90
RH % (24H TREND) 86 (-4) 45 (-12) 87 47
WIND 20FT/EARLY(MPH) E 14 E 17 E 13 E 17
WIND 20FT/LATE(MPH) NE 13 E 18 NE 12 E 17
MIXING HGT(FT-AGL/MSL) 5330 5990
TRANSPORT WND (MPH) E 16 E 21
VENT RATE (KT-FT) 74620 107820
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-180800-
SOUTHERN HILLS-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 10 20
TEMP (24H TREND) 69 (-3) 86 (+3) 68 86
RH % (24H TREND) 97 (+2) 59 (-9) 96 56
WIND 20FT/EARLY(MPH) E 13 E 14 E 13 E 13
WIND 20FT/LATE(MPH) E 13 E 13 E 12 E 14
MIXING HGT(FT-AGL/MSL) 5770 6050
TRANSPORT WND (MPH) E 15 E 20
VENT RATE (KT-FT) 75010 102850
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-180800-
NORTH COASTAL PLAINS-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 30 20 40
TEMP (24H TREND) 72 (-2) 90 (+1) 71 90
RH % (24H TREND) 98 (+2) 56 (-8) 95 55
WIND 20FT/EARLY(MPH) E 18 E 16 E 18 E 16
WIND 20FT/LATE(MPH) E 13 E 20 E 12 E 18
MIXING HGT(FT-AGL/MSL) 5120 5900
TRANSPORT WND (MPH) E 18 E 20
VENT RATE (KT-FT) 81920 100300
DISPERSION 5 5
DSI 6 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-180800-
NORTHERN HILLS-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 0 50 0 50
TEMP (24H TREND) 70 (-2) 88 (0) 69 88
RH % (24H TREND) 97 (-1) 58 (-6) 95 56
WIND 20FT/EARLY(MPH) E 14 E 14 E 16 E 13
WIND 20FT/LATE(MPH) E 9 E 18 E 9 E 17
MIXING HGT(FT-AGL/MSL) 5980 5690
TRANSPORT WND (MPH) E 16 E 15
VENT RATE (KT-FT) 83720 73970
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-180800-
WEST COAST-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 40 50 10 30
TEMP (24H TREND) 72 (-2) 91 (+1) 71 91
RH % (24H TREND) 97 (+2) 58 (-6) 93 54
WIND 20FT/EARLY(MPH) E 12 E 14 E 13 E 14
WIND 20FT/LATE(MPH) E 11 E 14 E 10 E 16
MIXING HGT(FT-AGL/MSL) 4880 4530
TRANSPORT WND (MPH) E 13 E 12
VENT RATE (KT-FT) 53680 45300
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-180800-
EASTERN INTERIOR-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 30 40
TEMP (24H TREND) 70 (-3) 87 (+2) 69 87
RH % (24H TREND) 97 (0) 60 (-7) 96 58
WIND 20FT/EARLY(MPH) E 14 E 16 E 14 E 16
WIND 20FT/LATE(MPH) E 16 E 13 E 14 E 16
MIXING HGT(FT-AGL/MSL) 6020 6190
TRANSPORT WND (MPH) E 15 E 21
VENT RATE (KT-FT) 78260 111420
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-180800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 60 40 40
TEMP (24H TREND) 68 (-3) 82 (+2) 68 83
RH % (24H TREND) 100 (+1) 66 (-12) 98 64
WIND 20FT/EARLY(MPH) E 11 E 13 E 12 E 13
WIND 20FT/LATE(MPH) E 12 E 12 E 11 E 13
MIXING HGT(FT-AGL/MSL) 4540 4860
TRANSPORT WND (MPH) E 15 E 25
VENT RATE (KT-FT) 59020 106920
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-180800-
CENTRAL MOUNTAIN RANGE-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS TSTMS SHOWERS TSTMS
CHANCE PRECIP (%) 10 50 0 40
TEMP (24H TREND) 66 (-4) 87 (+5) 65 87
RH % (24H TREND) 98 (+1) 61 (-8) 97 57
WIND 20FT/EARLY(MPH) E 9 E 10 E 11 E 10
WIND 20FT/LATE(MPH) E 8 E 10 E 8 E 11
MIXING HGT(FT-AGL/MSL) 6550 6200
TRANSPORT WND (MPH) E 15 E 14
VENT RATE (KT-FT) 85150 74400
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-180800-
CAYEY MOUNTAIN RANGE-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 50 30 20
TEMP (24H TREND) 69 (-2) 82 (+2) 68 83
RH % (24H TREND) 99 (-1) 67 (-7) 98 64
WIND 20FT/EARLY(MPH) E 11 E 12 E 11 E 12
WIND 20FT/LATE(MPH) E 11 E 12 E 10 E 12
MIXING HGT(FT-AGL/MSL) 4970 4970
TRANSPORT WND (MPH) E 15 E 23
VENT RATE (KT-FT) 64610 99400
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-180800-
VIEQUES-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 30 40
TEMP (24H TREND) 74 (-3) 87 (0) 74 87
RH % (24H TREND) 91 (-2) 61 (-6) 88 60
WIND 20FT/EARLY(MPH) E 18 E 19 E 17 E 18
WIND 20FT/LATE(MPH) E 19 E 16 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3720 3550
TRANSPORT WND (MPH) E 22 E 24
VENT RATE (KT-FT) 70680 74550
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-180800-
CULEBRA-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 60 30 40
TEMP (24H TREND) 76 (-2) 89 (+2) 76 89
RH % (24H TREND) 92 (+1) 57 (-11) 88 58
WIND 20FT/EARLY(MPH) E 18 E 19 E 17 E 18
WIND 20FT/LATE(MPH) E 19 E 16 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3830 3650
TRANSPORT WND (MPH) E 22 E 24
VENT RATE (KT-FT) 72770 76650
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-180800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 0 10
TEMP (24H TREND) 73 (-2) 91 (+2) 72 91
RH % (24H TREND) 89 (+1) 47 (-9) 85 46
WIND 20FT/EARLY(MPH) E 17 E 20 E 14 E 19
WIND 20FT/LATE(MPH) E 17 E 20 E 13 E 21
MIXING HGT(FT-AGL/MSL) 5160 5470
TRANSPORT WND (MPH) E 21 E 22
VENT RATE (KT-FT) 92880 103930
DISPERSION 5 5
DSI 5 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-180800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 60 50 20 40
TEMP (24H TREND) 75 (-3) 86 (+1) 75 86
RH % (24H TREND) 92 (+2) 62 (-8) 87 60
WIND 20FT/EARLY(MPH) E 18 E 19 E 18 E 19
WIND 20FT/LATE(MPH) E 19 E 16 E 18 E 17
MIXING HGT(FT-AGL/MSL) 4130 3590
TRANSPORT WND (MPH) E 21 E 21
VENT RATE (KT-FT) 74340 64620
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-180800-
ST CROIX-
330 PM AST SUN MAY 17 2026
TONIGHT MON MON NIGHT TUE
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 20 30
TEMP (24H TREND) 75 (-2) 87 (+1) 75 87
RH % (24H TREND) 92 (0) 61 (-8) 87 61
WIND 20FT/EARLY(MPH) E 18 E 19 E 18 E 18
WIND 20FT/LATE(MPH) E 19 E 16 E 18 E 17
MIXING HGT(FT-AGL/MSL) 5540 4760
TRANSPORT WND (MPH) E 18 E 23
VENT RATE (KT-FT) 88640 95200
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page