650
FNCA52 TJSJ 290730
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 AM AST SAT AUG 29 2026
DISCUSSION
A DRIER-THAN-NORMAL AIR MASS WILL MOVE INTO THE REGION BY
MIDMORNING TODAY, REPLACING THE MOISTURE ASSOCIATED WITH A WEAK
TROPICAL WAVE. AS A RESULT, MINIMUM RELATIVE HUMIDITY VALUES ARE
EXPECTED TO FALL INTO THE MID-50S OR LOWER ACROSS PORTIONS OF THE
ISLANDS. EASTERLY WINDS OF 12 TO 18 MPH ARE EXPECTED, WITH
LOCALLY HIGHER GUSTS, ESPECIALLY NEAR COASTAL AREAS. THESE
CONDITIONS, COMBINED WITH DRY FUELS DUE TO ONGOING RAINFALL
DEFICITS, WILL INCREASE THE POTENTIAL FOR WILDFIRE IGNITION AND
RAPID SPREAD.
THEREFORE, AN ELEVATED FIRE DANGER IS EXPECTED TODAY ACROSS
PORTIONS OF THE SOUTHERN PLAINS AND HILLS OF PUERTO RICO, AS WELL
AS VIEQUES, CULEBRA, AND THE U.S. VIRGIN ISLANDS. A FIRE DANGER
STATEMENT IS IN EFFECT FROM 10 AM THROUGH 5 PM AST FOR THESE
AREAS. FIRE WEATHER PARTNERS ARE ENCOURAGED TO CONTINUE
MONITORING THE FORECAST FOR POSSIBLE UPDATES. RESIDENTS AND
VISITORS ARE STRONGLY URGED TO AVOID OUTDOOR BURNING, AS
CONDITIONS WILL EASILY SUPPORT WILDFIRE IGNITION AND RAPID
SPREAD.
INCREASING MOISTURE AND RAIN CHANCES LATER TONIGHT, CONTINUING
INTO SUNDAY AND EARLY NEXT WEEK, ARE EXPECTED TO REDUCE THE FIRE-
WEATHER THREAT.
PRZ014-292000-
SOUTHEAST COASTAL PLAINS-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 50 10 60
TEMP (24H TREND) 94 (+2) 77 (-1) 90
RH % (24H TREND) 46 (-8) 87 (+2) 58
WIND 20FT/EARLY(MPH) E 16 E 12 NE 6
WIND 20FT/LATE(MPH) E 16 NE 10 E 9
MIXING HGT(FT-AGL/MSL)5290 3520
TRANSPORT WND (MPH) E 18 NE 5
VENT RATE (KT-FT) 84640 14080
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ015-292000-
SOUTHERN HILLS-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 10 70
TEMP (24H TREND) 91 (+3) 72 (-3) 87
RH % (24H TREND) 56 (-8) 93 (+1) 61
WIND 20FT/EARLY(MPH) E 13 NE 13 NE 9
WIND 20FT/LATE(MPH) E 13 NE 11 E 11
MIXING HGT(FT-AGL/MSL)5660 3930
TRANSPORT WND (MPH) E 16 NE 7
VENT RATE (KT-FT) 79240 23580
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ016-292000-
NORTH COASTAL PLAINS-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 40 60
TEMP (24H TREND) 93 (+2) 77 (-1) 88
RH % (24H TREND) 60 (-4) 94 (+2) 63
WIND 20FT/EARLY(MPH) E 14 E 19 NE 14
WIND 20FT/LATE(MPH) E 21 E 13 E 13
MIXING HGT(FT-AGL/MSL)5410 3400
TRANSPORT WND (MPH) E 18 NE 13
VENT RATE (KT-FT) 86560 37400
DISPERSION 5 5
DSI 6 6 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ017-292000-
NORTHERN HILLS-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 30 60
TEMP (24H TREND) 92 (+3) 74 (-1) 85
RH % (24H TREND) 63 (-4) 96 (0) 67
WIND 20FT/EARLY(MPH) E 12 E 17 NE 13
WIND 20FT/LATE(MPH) E 18 E 12 NE 12
MIXING HGT(FT-AGL/MSL)5930 4010
TRANSPORT WND (MPH) E 14 NE 13
VENT RATE (KT-FT) 71160 44110
DISPERSION 5 5
DSI 6 5 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ018-292000-
WEST COAST-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 30 20 70
TEMP (24H TREND) 94 (+1) 74 (-1) 90
RH % (24H TREND) 60 (-2) 95 (+1) 58
WIND 20FT/EARLY(MPH) E 13 E 13 NE 16
WIND 20FT/LATE(MPH) E 13 NE 16 E 14
MIXING HGT(FT-AGL/MSL)4400 4090
TRANSPORT WND (MPH) E 10 NE 10
VENT RATE (KT-FT) 39600 36810
DISPERSION 5 5
DSI 6 4 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ019-292000-
EASTERN INTERIOR-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 40 80
TEMP (24H TREND) 92 (+3) 74 (-3) 87
RH % (24H TREND) 57 (-6) 93 (-1) 66
WIND 20FT/EARLY(MPH) E 14 E 13 NE 13
WIND 20FT/LATE(MPH) E 13 NE 13 E 16
MIXING HGT(FT-AGL/MSL)6120 3430
TRANSPORT WND (MPH) E 17 NE 8
VENT RATE (KT-FT) 91800 24010
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ022-292000-
LUQUILLO MOUNTAIN RANGE-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 40 40 80
TEMP (24H TREND) 87 (+4) 71 (-3) 83
RH % (24H TREND) 64 (-8) 96 (-1) 70
WIND 20FT/EARLY(MPH) E 12 E 11 NE 10
WIND 20FT/LATE(MPH) E 12 NE 10 E 12
MIXING HGT(FT-AGL/MSL)4840 2930
TRANSPORT WND (MPH) E 18 SE 8
VENT RATE (KT-FT) 77440 20510
DISPERSION 5 5
DSI 6 5 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ023-292000-
CENTRAL MOUNTAIN RANGE-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 20 20 70
TEMP (24H TREND) 89 (+5) 70 (-2) 83
RH % (24H TREND) 66 (-6) 95 (-1) 68
WIND 20FT/EARLY(MPH) E 10 E 11 NE 13
WIND 20FT/LATE(MPH) E 11 NE 11 E 12
MIXING HGT(FT-AGL/MSL)6840 4360
TRANSPORT WND (MPH) E 10 NE 10
VENT RATE (KT-FT) 61560 39240
DISPERSION 5 5
DSI 6 2 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ024-292000-
CAYEY MOUNTAIN RANGE-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 50 30 70
TEMP (24H TREND) 88 (+3) 72 (-2) 84
RH % (24H TREND) 61 (-6) 96 (-2) 68
WIND 20FT/EARLY(MPH) E 12 E 11 NE 6
WIND 20FT/LATE(MPH) E 12 NE 9 E 10
MIXING HGT(FT-AGL/MSL)5370 3320
TRANSPORT WND (MPH) E 18 NE 7
VENT RATE (KT-FT) 85920 19920
DISPERSION 5 5
DSI 6 3 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ025-292000-
VIEQUES-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 40 50 80
TEMP (24H TREND) 92 (+2) 80 (-1) 89
RH % (24H TREND) 56 (-5) 87 (+3) 63
WIND 20FT/EARLY(MPH) E 17 E 17 NE 16
WIND 20FT/LATE(MPH) E 16 NE 17 SE 20
MIXING HGT(FT-AGL/MSL)3510 2860
TRANSPORT WND (MPH) E 23 S 22
VENT RATE (KT-FT) 70200 54340
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ026-292000-
CULEBRA-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER PCLDY PCLDY MCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 30 50 80
TEMP (24H TREND) 92 (+2) 79 (-3) 89
RH % (24H TREND) 59 (-7) 87 (+2) 63
WIND 20FT/EARLY(MPH) E 17 E 17 NE 16
WIND 20FT/LATE(MPH) E 16 NE 17 SE 21
MIXING HGT(FT-AGL/MSL)3480 2930
TRANSPORT WND (MPH) E 23 S 25
VENT RATE (KT-FT) 69600 64460
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
PRZ027-292000-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS TSTMS
CHANCE PRECIP (%) 10 0 80
TEMP (24H TREND) 94 (+2) 75 (-3) 90
RH % (24H TREND) 49 (-6) 89 (+7) 55
WIND 20FT/EARLY(MPH) E 19 E 13 NE 16
WIND 20FT/LATE(MPH) SE 20 NE 14 SE 13
MIXING HGT(FT-AGL/MSL)4900 3540
TRANSPORT WND (MPH) E 20 SE 5
VENT RATE (KT-FT) 83300 14160
DISPERSION 5 5
DSI 6 2 5
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ001-292000-
SAINT THOMAS AND SAINT JOHN-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLDY
PRECIP TYPE SHOWERS TSTMS TSTMS
CHANCE PRECIP (%) 10 50 70
TEMP (24H TREND) 90 (+2) 79 (-2) 87
RH % (24H TREND) 61 (-5) 89 (+3) 66
WIND 20FT/EARLY(MPH) E 18 NE 19 E 16
WIND 20FT/LATE(MPH) E 17 NE 18 SE 24
MIXING HGT(FT-AGL/MSL)3370 2750
TRANSPORT WND (MPH) E 21 SE 31
VENT RATE (KT-FT) 60660 74250
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
VIZ002-292000-
ST CROIX-
330 AM AST SAT AUG 29 2026
TODAY TONIGHT SUN
CLOUD COVER MCLEAR PCLDY MCLDY
PRECIP TYPE NONE TSTMS TSTMS
CHANCE PRECIP (%) 0 50 70
TEMP (24H TREND) 91 (+2) 78 (-3) 87
RH % (24H TREND) 61 (-5) 88 (-1) 66
WIND 20FT/EARLY(MPH) E 17 NE 17 E 14
WIND 20FT/LATE(MPH) E 17 NE 16 SE 18
MIXING HGT(FT-AGL/MSL)4690 3810
TRANSPORT WND (MPH) E 23 S 22
VENT RATE (KT-FT) 93800 72390
DISPERSION 5 5
DSI 6 6 6
RH RECOVERY EXCELLENT
REMARKS...NONE.
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