138
FNCA52 TJSJ 071930
FWFSJU
FIRE WEATHER PLANNING FORECAST FOR PUERTO RICO
NATIONAL WEATHER SERVICE SAN JUAN PR
330 PM AST FRI AUG 7 2026
DISCUSSION
CRITICAL FUEL CONDITIONS PERSIST ACROSS THE ISLANDS, WITH EXTREME
DROUGHT CONDITIONS ACROSS PORTIONS OF THE SOUTHERN COASTAL PLAINS
OF PUERTO RICO. RAWS STATIONS HAVE REPORTED WINDS BETWEEN 8 -
13 MPH AND GUSTS UP TO 25 MPH DURING THE MORNING HOURS.
ADDITIONALLY, AS A DRIER AIR MASS CONTINUES TO FILTER INTO THE
REGION, MOISTURE CONTENT HAS DROPPED SIGNIFICANTLY, WITH RH
VALUES BETWEEN 47 AND 54 %, WELL BELOW THRESHOLDS. DUE TO
CRITICAL FUEL CONDITIONS ACROSS THE SOUTHERN AREA OF THE ISLAND
AND KDBI VALUES WELL ABOVE THRESHOLDS, THE FIRE DANGER THREAT
REMAINS ELEVATED. HENCE, THE FIRE DANGER STATEMENT CONTINUES IN
EFFECT THROUGH 5 PM AST. RESIDENTS AND VISITORS ARE ENCOURAGED TO
AVOID OUTDOOR BURNING, AS CONDITIONS WILL LIKELY BE FAVORABLE FOR
WILDFIRE IGNITION AND RAPID SPREAD.
PRZ014-080800-
SOUTHEAST COASTAL PLAINS-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY CLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 20 0 0
TEMP (24H TREND) 74 (-2) 92 (+1) 75 91
RH % (24H TREND) 90 (+4) 49 (-8) 94 56
WIND 20FT/EARLY(MPH) E 16 E 16 NE 14 E 19
WIND 20FT/LATE(MPH) NE 12 E 18 G25 NE 11 E 19
MIXING HGT(FT-AGL/MSL) 5480 5960
TRANSPORT WND (MPH) E 17 E 24
VENT RATE (KT-FT) 82200 125160
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ015-080800-
SOUTHERN HILLS-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY CLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 10 20 0 10
TEMP (24H TREND) 70 (-4) 90 (+4) 71 89
RH % (24H TREND) 97 (+7) 53 (-9) 98 62
WIND 20FT/EARLY(MPH) E 13 E 13 E 12 E 16
WIND 20FT/LATE(MPH) NE 12 E 13 NE 12 E 16
MIXING HGT(FT-AGL/MSL) 6210 6370
TRANSPORT WND (MPH) E 16 E 23
VENT RATE (KT-FT) 86940 127400
DISPERSION 5 5
DSI 3 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ016-080800-
NORTH COASTAL PLAINS-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY CLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 30 0 30
TEMP (24H TREND) 74 (-2) 92 (+2) 75 90
RH % (24H TREND) 97 (+4) 56 (-9) 99 63
WIND 20FT/EARLY(MPH) E 17 E 14 E 19 E 18
WIND 20FT/LATE(MPH) E 12 E 20 E 12 E 20
MIXING HGT(FT-AGL/MSL) 5000 5610
TRANSPORT WND (MPH) E 17 E 23
VENT RATE (KT-FT) 75000 112200
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ017-080800-
NORTHERN HILLS-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY CLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS NONE TSTMS
CHANCE PRECIP (%) 10 40 0 40
TEMP (24H TREND) 71 (-2) 90 (+2) 72 89
RH % (24H TREND) 99 (+4) 57 (-8) 100 67
WIND 20FT/EARLY(MPH) E 16 E 13 E 17 E 17
WIND 20FT/LATE(MPH) E 10 NE 18 E 10 E 19
MIXING HGT(FT-AGL/MSL) 5800 6300
TRANSPORT WND (MPH) E 14 E 21
VENT RATE (KT-FT) 69600 113400
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ018-080800-
WEST COAST-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR MCLEAR CLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS NONE TSTMS
CHANCE PRECIP (%) 30 50 0 60
TEMP (24H TREND) 72 (-2) 92 (+1) 73 92
RH % (24H TREND) 98 (+4) 57 (-6) 98 64
WIND 20FT/EARLY(MPH) E 16 E 12 E 14 E 14
WIND 20FT/LATE(MPH) E 13 E 14 NE 14 E 17
MIXING HGT(FT-AGL/MSL) 5010 5490
TRANSPORT WND (MPH) E 10 E 15
VENT RATE (KT-FT) 45090 71370
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ019-080800-
EASTERN INTERIOR-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 0 30
TEMP (24H TREND) 72 (-3) 91 (+3) 73 89
RH % (24H TREND) 98 (+6) 55 (-6) 100 63
WIND 20FT/EARLY(MPH) E 13 E 12 E 12 E 14
WIND 20FT/LATE(MPH) E 14 E 13 E 14 E 14
MIXING HGT(FT-AGL/MSL) 6350 6710
TRANSPORT WND (MPH) E 17 E 23
VENT RATE (KT-FT) 95250 134200
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ022-080800-
LUQUILLO MOUNTAIN RANGE-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 40 20 30
TEMP (24H TREND) 70 (-4) 87 (+5) 70 86
RH % (24H TREND) 100 (+6) 62 (-8) 100 69
WIND 20FT/EARLY(MPH) E 11 E 11 E 10 E 13
WIND 20FT/LATE(MPH) E 11 E 12 E 11 E 13
MIXING HGT(FT-AGL/MSL) 4090 5400
TRANSPORT WND (MPH) E 17 E 23
VENT RATE (KT-FT) 61350 108000
DISPERSION 5 5
DSI 5 6 5 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ023-080800-
CENTRAL MOUNTAIN RANGE-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR PCLDY CLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS NONE TSTMS
CHANCE PRECIP (%) 30 40 0 60
TEMP (24H TREND) 68 (-3) 88 (+5) 69 87
RH % (24H TREND) 99 (+4) 58 (-11) 100 70
WIND 20FT/EARLY(MPH) E 12 E 9 E 12 E 11
WIND 20FT/LATE(MPH) E 9 E 12 E 9 E 14
MIXING HGT(FT-AGL/MSL) 6900 6830
TRANSPORT WND (MPH) E 12 E 21
VENT RATE (KT-FT) 69000 122940
DISPERSION 5 5
DSI 2 6 2 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ024-080800-
CAYEY MOUNTAIN RANGE-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY CLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS NONE SHOWERS
CHANCE PRECIP (%) 30 40 0 20
TEMP (24H TREND) 70 (-3) 87 (+3) 70 85
RH % (24H TREND) 98 (+3) 60 (-6) 100 71
WIND 20FT/EARLY(MPH) E 11 E 12 E 11 E 14
WIND 20FT/LATE(MPH) E 10 E 12 E 10 E 14
MIXING HGT(FT-AGL/MSL) 5080 6060
TRANSPORT WND (MPH) E 20 E 24
VENT RATE (KT-FT) 86360 127260
DISPERSION 5 5
DSI 4 6 3 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ025-080800-
VIEQUES-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY PCLDY MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 20 20
TEMP (24H TREND) 79 (0) 91 (+2) 78 91
RH % (24H TREND) 82 (-4) 55 (-4) 88 58
WIND 20FT/EARLY(MPH) E 14 E 14 E 17 E 18
WIND 20FT/LATE(MPH) E 18 E 16 E 19 E 17
MIXING HGT(FT-AGL/MSL) 3530 3460
TRANSPORT WND (MPH) E 18 E 24
VENT RATE (KT-FT) 56480 72660
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ026-080800-
CULEBRA-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER PCLDY MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 30 30 20 20
TEMP (24H TREND) 79 (-1) 91 (+2) 78 91
RH % (24H TREND) 87 (-1) 59 (-6) 91 61
WIND 20FT/EARLY(MPH) E 16 E 16 E 17 E 18
WIND 20FT/LATE(MPH) E 17 E 14 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3460 3340
TRANSPORT WND (MPH) E 21 E 24
VENT RATE (KT-FT) 62280 70140
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
PRZ027-080800-
SOUTHWEST COASTAL PLAINS AND MONA ISLAND-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR MCLEAR CLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS NONE TSTMS
CHANCE PRECIP (%) 20 20 0 30
TEMP (24H TREND) 74 (-1) 92 (+2) 74 92
RH % (24H TREND) 92 (+8) 52 (-6) 94 58
WIND 20FT/EARLY(MPH) E 13 E 17 E 18 E 19
WIND 20FT/LATE(MPH) E 13 SE 19 NE 12 E 23
MIXING HGT(FT-AGL/MSL) 5030 5960
TRANSPORT WND (MPH) E 17 E 21
VENT RATE (KT-FT) 75450 107280
DISPERSION 5 5
DSI 4 6 4 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ001-080800-
SAINT THOMAS AND SAINT JOHN-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR MCLEAR
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20 10
TEMP (24H TREND) 78 (-1) 90 (+3) 78 89
RH % (24H TREND) 85 (-2) 60 (-4) 92 62
WIND 20FT/EARLY(MPH) E 18 E 16 E 18 E 18
WIND 20FT/LATE(MPH) E 18 E 16 E 18 E 17
MIXING HGT(FT-AGL/MSL) 3450 3320
TRANSPORT WND (MPH) E 21 E 24
VENT RATE (KT-FT) 62100 69720
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
VIZ002-080800-
ST CROIX-
330 PM AST FRI AUG 7 2026
TONIGHT SAT SAT NIGHT SUN
CLOUD COVER MCLEAR MCLEAR MCLEAR PCLDY
PRECIP TYPE SHOWERS SHOWERS SHOWERS SHOWERS
CHANCE PRECIP (%) 20 20 20 10
TEMP (24H TREND) 78 (-1) 90 (+2) 78 89
RH % (24H TREND) 84 (-4) 61 (-3) 93 64
WIND 20FT/EARLY(MPH) E 16 E 16 E 17 E 18
WIND 20FT/LATE(MPH) E 17 E 16 E 17 E 18
MIXING HGT(FT-AGL/MSL) 4590 5200
TRANSPORT WND (MPH) E 23 E 28
VENT RATE (KT-FT) 91800 124800
DISPERSION 5 5
DSI 6 6 6 6
RH RECOVERY EXCELLENT EXCELLENT
REMARKS...NONE.
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