527
FNCA52 TJSJ 180730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST WED MAR 18 2026
DISCUSSION
THE FIRE DANGER TODAY WILL REMAIN RELATIVE LOW AS BRIEF SURGE IN
LOW-LEVEL MOISTURE IS CROSS THE ISLANDS THIS MORNING. THIS COULD
KEEP RELATIVE HUMIDITIES FROM DROPPING TO CRITICAL FIRE WEATHER
THRESHOLDS. HOWEVER, BREEZY CONDITIONS WILL CONTINUE ALONG THE
SOUTHERN COAST OF PR, WHERE KBDI VALUES REMAIN WELL ABOVE
CRITICAL LEVELS, PARTICULARLY IN CABO ROJO AT 689.
PRZ014-182000-
SOUTHEAST COASTAL PLAINS-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 50 60
TEMP (24H TREND) 87 (+2) 68 (-3) 86
RH % (24H TREND) 49 (+1) 87 (+1) 50
WIND 20FT/EARLY(MPH) E 16 E 12 E 14
WIND 20FT/LATE(MPH) E 17 G24 NE 11 SE 14
MIXING HGT(FT-AGL/MSL)5420 5480
TRANSPORT WND (MPH) E 18 E 15
VENT RATE (KT-FT) 86720 71240
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-182000-
SOUTHERN HILLS-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 40 40
TEMP (24H TREND) 83 (+3) 64 (-4) 83
RH % (24H TREND) 54 (-6) 95 (+5) 58
WIND 20FT/EARLY(MPH) E 16 E 12 E 11
WIND 20FT/LATE(MPH) E 14 E 11 SE 11
MIXING HGT(FT-AGL/MSL)6110 6090
TRANSPORT WND (MPH) E 17 E 15
VENT RATE (KT-FT) 91650 79170
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-182000-
NORTH COASTAL PLAINS-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 10 30 40
TEMP (24H TREND) 87 (+1) 67 (-3) 86
RH % (24H TREND) 52 (-5) 96 (+4) 55
WIND 20FT/EARLY(MPH) E 14 E 13 E 12
WIND 20FT/LATE(MPH) E 18 SE 10 E 17
MIXING HGT(FT-AGL/MSL)6080 6070
TRANSPORT WND (MPH) E 18 E 15
VENT RATE (KT-FT) 97280 78910
DISPERSION 5 5
DSI 6 4 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-182000-
NORTHERN HILLS-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 20 60
TEMP (24H TREND) 86 (+2) 65 (-3) 85
RH % (24H TREND) 48 (-6) 94 (+3) 55
WIND 20FT/EARLY(MPH) E 12 E 11 E 10
WIND 20FT/LATE(MPH) E 16 SE 6 E 13
MIXING HGT(FT-AGL/MSL)7420 6410
TRANSPORT WND (MPH) E 13 E 13
VENT RATE (KT-FT) 81620 70510
DISPERSION 5 5
DSI 6 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-182000-
WEST COAST-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 50 20 20
TEMP (24H TREND) 87 (0) 65 (-4) 87
RH % (24H TREND) 52 (-3) 92 (+4) 56
WIND 20FT/EARLY(MPH) E 16 E 13 E 12
WIND 20FT/LATE(MPH) SE 16 E 12 SE 14
MIXING HGT(FT-AGL/MSL)5510 5540
TRANSPORT WND (MPH) E 13 SE 13
VENT RATE (KT-FT) 60610 60940
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-182000-
EASTERN INTERIOR-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 60 60
TEMP (24H TREND) 84 (+2) 66 (-3) 83
RH % (24H TREND) 55 (-6) 97 (+4) 59
WIND 20FT/EARLY(MPH) E 14 E 12 E 12
WIND 20FT/LATE(MPH) E 14 E 11 SE 13
MIXING HGT(FT-AGL/MSL)6190 6640
TRANSPORT WND (MPH) E 18 SE 15
VENT RATE (KT-FT) 99040 86320
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-182000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 60
TEMP (24H TREND) 79 (+2) 64 (-3) 79
RH % (24H TREND) 63 (-5) 98 (+3) 66
WIND 20FT/EARLY(MPH) E 13 E 11 E 11
WIND 20FT/LATE(MPH) E 13 E 9 SE 12
MIXING HGT(FT-AGL/MSL)5140 4990
TRANSPORT WND (MPH) E 21 E 17
VENT RATE (KT-FT) 92520 74850
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-182000-
CENTRAL MOUNTAIN RANGE-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 10 50
TEMP (24H TREND) 84 (+4) 62 (-4) 83
RH % (24H TREND) 52 (-6) 96 (+4) 58
WIND 20FT/EARLY(MPH) E 11 E 9 E 9
WIND 20FT/LATE(MPH) SE 11 E 6 SE 10
MIXING HGT(FT-AGL/MSL)8050 6780
TRANSPORT WND (MPH) E 10 SE 12
VENT RATE (KT-FT) 72450 67800
DISPERSION 5 5
DSI 6 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-182000-
CAYEY MOUNTAIN RANGE-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 40 60 60
TEMP (24H TREND) 79 (+2) 64 (-3) 78
RH % (24H TREND) 62 (-4) 99 (+2) 67
WIND 20FT/EARLY(MPH) E 13 E 11 E 10
WIND 20FT/LATE(MPH) E 13 E 9 SE 10
MIXING HGT(FT-AGL/MSL)5370 5470
TRANSPORT WND (MPH) E 21 E 15
VENT RATE (KT-FT) 96660 71110
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-182000-
VIEQUES-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 50 40
TEMP (24H TREND) 85 (0) 71 (-2) 85
RH % (24H TREND) 54 (-4) 88 (+2) 57
WIND 20FT/EARLY(MPH) E 17 E 16 E 13
WIND 20FT/LATE(MPH) E 17 E 16 E 13
MIXING HGT(FT-AGL/MSL)4050 4160
TRANSPORT WND (MPH) E 22 E 18
VENT RATE (KT-FT) 76950 66560
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-182000-
CULEBRA-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 40 40
TEMP (24H TREND) 85 (0) 72 (-2) 85
RH % (24H TREND) 56 (-5) 91 (+6) 58
WIND 20FT/EARLY(MPH) E 18 E 16 E 13
WIND 20FT/LATE(MPH) E 18 E 16 E 13
MIXING HGT(FT-AGL/MSL)3820 4010
TRANSPORT WND (MPH) E 22 E 18
VENT RATE (KT-FT) 72580 64160
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-182000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 0 20
TEMP (24H TREND) 88 (+2) 67 (-4) 87
RH % (24H TREND) 48 (0) 89 (+6) 47
WIND 20FT/EARLY(MPH) E 17 G25 E 18 E 16
WIND 20FT/LATE(MPH) SE 18 G27 E 17 SE 20
MIXING HGT(FT-AGL/MSL)5200 5390
TRANSPORT WND (MPH) E 21 SE 18
VENT RATE (KT-FT) 93600 86240
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-182000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER PCLDY PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 30
TEMP (24H TREND) 85 (+1) 72 (-3) 85
RH % (24H TREND) 53 (-8) 89 (+7) 56
WIND 20FT/EARLY(MPH) E 19 E 16 E 16
WIND 20FT/LATE(MPH) E 18 E 16 E 14
MIXING HGT(FT-AGL/MSL)3900 3990
TRANSPORT WND (MPH) E 23 E 20
VENT RATE (KT-FT) 78000 67830
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-182000-
ST CROIX-
330 AM AST WED MAR 18 2026
TODAY TONIGHT THU
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 30 30
TEMP (24H TREND) 86 (+1) 70 (-4) 86
RH % (24H TREND) 53 (-8) 91 (+8) 58
WIND 20FT/EARLY(MPH) E 17 E 14 E 14
WIND 20FT/LATE(MPH) E 17 E 14 E 14
MIXING HGT(FT-AGL/MSL)4900 4700
TRANSPORT WND (MPH) E 22 E 20
VENT RATE (KT-FT) 93100 79900
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page