848
FNUS72 KGSP 270642
FWSGSP
SPOT FORECAST FOR TWENTYMILE WF...NPS
NATIONAL WEATHER SERVICE GREENVILLE-SPARTANBURG SC
242 AM EDT FRI MAR 27 2026
FORECAST IS BASED ON FORECAST START TIME OF 0600 EDT ON MARCH 27.
IF CONDITIONS BECOME UNREPRESENTATIVE...CONTACT THE NATIONAL WEATHER
SERVICE.
DISCUSSION
COLD FRONT COMES THROUGH TODAY WITH A FEW SHOWERS REACHING THE BURN
SITE AFTER 2PM. WINDS ARE W/WNW BEFORE TURNING N/NW AFTER 4PM. GUSTS
INCREASE OVERNIGHT UP TO 25 MPH. EXPECT CRITICAL RH ON SATURDAY AS
RH DIPS TO 20%, BUT COULD DROP LOWER DEPENDING ON HOW MUCH DRY AIR
MOVES IN BEHIND THE FRONT. WINDS DIMINISH THROUGH THE DAY. TEMPS
ARE MILD.
TODAY
SKY/WEATHER.........MOSTLY SUNNY (35-45 PERCENT) THEN BECOMING
MOSTLY CLOUDY (75-85 PERCENT). CHANCE OF RAIN
SHOWERS LATE IN THE AFTERNOON. RAIN SHOWERS
LIKELY LATE IN THE AFTERNOON.
CHANCE OF THUNDER...10 PERCENT.
MAX TEMPERATURE.....AROUND 80.
MIN HUMIDITY........51 PERCENT.
WIND (20 FT)........WEST WINDS 6 TO 9 MPH. GUSTS UP TO 21 MPH LATE
IN THE MORNING.
MIXING HEIGHT.......4700 FT AGL.
TRANSPORT WINDS.....WEST 12 TO 21 MPH SHIFTING TO THE NORTHWEST
AROUND 15 MPH LATE IN THE AFTERNOON.
SMOKE DISPERSAL.....FAIR (17493 MPH-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (88616 MPH-FT) IN THE
AFTERNOON.
LVORI...............3.
ADI.................5 EARLY IN THE MORNING INCREASING TO 104 IN THE
AFTERNOON.
STABILITY CLASS.....4.
PCPN AMOUNT.........0.05 INCHES.
CEILING (FT)........18400 DECREASING TO 3000.
VISIBILITY (SM).....6.
SFC PRESSURE (IN)...27.5.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........27 32 16 21 21 38 36 48 49 65 75 81
WEATHER COV..... CHC CHC LKY
WEATHER TYPE.... RW RW RW
TSTM COV........
CHC OF THDR (%).0 0 0 0 0 0 0 0 10 10 10 10
TEMP............58 57 58 61 66 71 75 78 80 79 78 76
DEWPOINT........53 54 54 55 57 58 59 59 60 60 60 60
RH..............84 88 87 80 72 64 57 53 51 52 53 58
20 FT WIND DIR..W W W W W W W W W W NW NW
20 FT WIND SPD..6 6 6 7 7 8 9 8 8 8 8 8
20 FT WIND GUST.15 15 15 16 17 20 21 20 20 20 21 21
MIX HGT (KFT)...1.5 1.5 1.5 2.0 3.1 3.9 4.1 4.5 4.7 4.2 3.5 2.7
TRANSP WIND DIR.W W W W W W W W W W W NW
TRANSP WIND SPD.12 12 13 13 20 21 20 20 18 18 17 15
LVORI...........5 4 4 3 3 1 1 1 1 1 1 1
ADI.............5 23 25 32 75 96 74 104 101 70 44 34
VRATE MPH-FT/1K.18 17 19 25 60 80 81 89 86 77 60 41
CEILING (HFT)...229 213 213 184 156 130 135 91 112 80 53 30
VISIBILITY (SM).9 9 9 9 9 9 9 9 9 9 9 6
SFC PRES (IN)...750 751 752 753 754 755 754 752 751 751 751 752
TONIGHT
SKY/WEATHER.........MOSTLY CLOUDY (70-80 PERCENT) THEN BECOMING
PARTLY CLOUDY (30-40 PERCENT). RAIN SHOWERS
LIKELY EARLY IN THE EVENING, THEN CHANCE OF
RAIN SHOWERS EARLY IN THE EVENING. SLIGHT
CHANCE OF RAIN SHOWERS LATE IN THE EVENING.
CHANCE OF THUNDER...10 PERCENT.
MIN TEMPERATURE.....AROUND 33.
MAX HUMIDITY........84 PERCENT.
WIND (20 FT)........NORTH WINDS 8 TO 10 MPH WITH GUSTS TO AROUND 25
MPH.
MIXING HEIGHT.......2200 FT AGL.
TRANSPORT WINDS.....NORTH 14 TO 22 MPH.
SMOKE DISPERSAL.....GOOD (30382 MPH-FT).
LVORI...............3.
ADI.................14 TO 32.
STABILITY CLASS.....4.
PCPN AMOUNT.........0.04 INCHES.
CEILING (FT)........1600 INCREASING TO 10300.
VISIBILITY (SM).....6.
SFC PRESSURE (IN)...27.54.
TIME (EDT) 6PM 7PM 8PM 9PM 10P 11P MID 1AM 2AM 3AM 4AM 5AM
SKY (%).........88 92 91 91 87 85 79 64 55 31 33 37
WEATHER COV.....LKY LKY CHC CHC SCH
WEATHER TYPE....RW RW RW RW RW
TSTM COV........
CHC OF THDR (%).10 10 10 10 10 0 0 0 0 0 0 0
TEMP............71 66 61 57 54 51 48 45 42 40 38 37
DEWPOINT........58 55 52 50 48 46 43 40 37 35 33 31
RH..............63 66 73 78 81 83 81 84 82 81 83 81
20 FT WIND DIR..NW NW N N NW N N N N N N N
20 FT WIND SPD..8 8 8 8 8 8 8 9 9 9 9 10
20 FT WIND GUST.22 23 23 24 24 24 24 24 24 25 25 25
MIX HGT (KFT)...2.5 2.2 2.3 2.3 2.4 2.4 2.4 2.4 2.5 2.7 2.6 2.2
TRANSP WIND DIR.N N N N N N N N N N N N
TRANSP WIND SPD.15 14 17 16 17 18 18 17 18 21 21 22
LVORI...........1 3 3 3 3 4 3 4 3 4 4 4
ADI.............32 19 23 22 23 25 25 23 25 14 14 15
VRATE MPH-FT/1K.37 30 40 38 41 44 43 42 46 56 54 48
CEILING (HFT)...25 20 16 22 34 58 53 49 44 64 83 103
VISIBILITY (SM).6 6 7 7 8 8 8 8 8 9 9 9
SFC PRES (IN)...754 757 760 763 765 767 768 769 770 771 772 774
SATURDAY
SKY/WEATHER.........SUNNY (10-20 PERCENT).
CHANCE OF THUNDER...0 PERCENT.
MAX TEMPERATURE.....AROUND 62.
MIN HUMIDITY........20 PERCENT.
WIND (20 FT)........NORTH WINDS 6 TO 10 MPH. GUSTS UP TO 25 MPH IN
THE MORNING AND EARLY AFTERNOON.
MIXING HEIGHT.......4700 FT AGL.
TRANSPORT WINDS.....NORTHEAST 13 TO 21 MPH.
SMOKE DISPERSAL.....GOOD (41431 MPH-FT) EARLY IN THE MORNING
INCREASING TO EXCELLENT (82287 MPH-FT) IN THE
AFTERNOON.
LVORI...............3.
ADI.................13 EARLY IN THE MORNING INCREASING TO 99 IN THE
AFTERNOON.
STABILITY CLASS.....3.
PCPN AMOUNT.........0.00 INCHES.
CEILING (FT)........10700 INCREASING TO 35000.
VISIBILITY (SM).....9 EARLY IN THE MORNING.
SFC PRESSURE (IN)...27.76.
TIME (EDT) 6AM 7AM 8AM 9AM 10A 11A 12P 1PM 2PM 3PM 4PM 5PM
SKY (%).........25 20 15 6 5 3 3 3 3 2 2 1
WEATHER COV.....
WEATHER TYPE....
TSTM COV........
CHC OF THDR (%).0 0 0 0 0 0 0 0 0 0 0 0
TEMP............34 34 33 34 38 44 49 53 57 60 61 61
DEWPOINT........29 27 25 24 23 22 21 21 20 20 20 20
RH..............80 76 74 67 54 42 34 27 23 21 20 20
20 FT WIND DIR..N N N N N N N N N N NE NE
20 FT WIND SPD..10 9 9 9 9 9 9 8 8 8 7 6
20 FT WIND GUST.25 24 23 23 23 23 22 21 18 17 17 15
MIX HGT (KFT)...2.3 2.1 2.2 2.7 3.1 3.4 3.7 4.0 4.2 4.5 4.7 4.5
TRANSP WIND DIR.N N N N N N N NE NE NE NE NE
TRANSP WIND SPD.20 20 21 18 20 21 21 21 20 17 15 13
LVORI...........4 3 3 1 1 1 1 1 1 1 1 1
ADI.............13 50 55 55 63 71 74 99 97 92 82 67
VRATE MPH-FT/1K.45 41 45 49 60 70 77 82 82 78 70 57
CEILING (HFT)...107 112 116 116 116 300 300 300 350 350 350 350
VISIBILITY (SM).9 9 9
SFC PRES (IN)...776 778 780 782 784 785 785 784 782 780 778 776
FORECASTER...CP
REQUESTED BY...MATT WOOD
TYPE OF REQUEST...WILDFIRE
.TAG 2607948.2/GSP
.DELDT 03/27/26
.FORMATTERVERSION 2.0.0
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