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Shaded-relief map of Irwin, South Carolina: rivers, roads, the city limits and where the water drains.
SOUTH CAROLINA · LANCASTER COUNTY

Irwin

1,321 people, 510 ft above sea level in Lancaster County.

510 ftElevation, city center
1,321People, 2024 estimate
3 sq miLand area
Sunny 55°
Sunny now Dew point 30° · N 3 mph · high 55°
City of Irwin River Interstate 2 miles
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The Irwin plate. Relief from Copernicus GLO-30; rivers and lakes from USGS NHD; watersheds from the USGS Watershed Boundary Dataset; roads and city limits from Census TIGER 2024.

MILE1
TODAY

Today in Irwin

NWS forecast and National Blend of Models · updated 1:00 PM EST
RIGHT NOW Lancaster County-mc Whirter Field (KLKR) · 2:35 PM
Sunny
55° Sunny Feels like 55° · high of 55° near 2 PM
WindN 3 mphgusts 13
Humidity38%falling to 35% this afternoon
Pressure30.08 in →steady
Visibility10 mihaze-free
CloudsClear
UV index—no forecast
Dew point 30° · Dryabout the same for three days
DryComfortableStickyMuggyOppressive
NEXT RAIN
Clear
Not this weeknone in the forecast for a week
LIKELY AMOUNT—nothing expected
LAST RAINNov. 60.83 in · 8 dry days
ALERTS & OUTLOOKS
! Freeze WarningFreeze Warning issued November 14 at 1:24PM EST until November 15 at 9:00AM EST by NWS Columbia SC
NWS Columbia and the Storm Prediction Center · checked 2:47 PM
SUN & MOON
↑ 6:56 AM5:19 PM ↓
10 h 23 m of daylight, 2 minutes less than yesterday
Waxing crescent, 25% lit. Next full moon: Nov. 24.
AIR & POLLEN
0
GOODAir quality index · fine particles
No pollen source yet.

The next three days, hour by hour

Sky: clear, cloudy, night Rain likely National Blend of Models
SATURDAY, NOV. 14
SUNDAY, NOV. 15
MONDAY, NOV. 16
TUESDAY, NOV. 17
2p
5p
8p
11p
2a
5a
8a
11a
2p
5p
8p
11p
2a
5a
8a
11a
2p
5p
8p
11p
2a
5a
8a
11a
mostly sunny
clear night
clear night
clear night
clear night
clear night
clear day
clear day
clear day
mostly clear night
mostly clear night
clear night
clear night
clear night
clear day
clear day
clear day
mostly clear night
clear night
clear night
clear night
clear night
clear day
clear day
TEMPERATURE °F
55°
32°
57°
34°
57°
34°
CHANCE OF RAIN
50%
WIND, MPH
8
5
5
0
0
0
3
6
5
2
0
2
5
5
6
5
3
1
0
0
0
0
4
6
HOW IT FEELS · DEW POINT
Dry: dew points 28 to 37°

The next seven days, and how sure we are

Forecast, with the range 8 in 10 ensemble members agree on Normal, about 80° / 62°
SAT Nov. 14 Mostly sunny Mostly sunny
55° 31°
0% rain — NW 8 A
SUN Nov. 15 Sunny Sunny
57° 33°
0% rain — N 4 A
MON Nov. 16 Sunny Sunny
58° 33°
0% rain — NE 5 A
TUE Nov. 17 Sunny Sunny
61° 34°
0% rain — NE 5 B
WED Nov. 18 Sunny Sunny
64° 34°
0% rain — NE 5 B
THU Nov. 19 Mostly sunny Mostly sunny
69° 38°
0% rain — NE 5 A
FRI Nov. 20 Mostly sunny Mostly sunny
70° 40°
0% rain — NE 5 B
How sure are we? AModels agree: highs within 4° BSome spread: within 8° CWide spread: check back
Range from the National Blend of Models percentiles · graded on Forecast Scores
AIR MAIL

Where today’s air came from

The air arriving over Irwin about 5,000 feet above the ground was over the northern Plains three days ago, and over the Ohio Valley a day ago, about 1,390 miles back along its path. Near the ground the air came from Alabama and Mississippi; at 10,000 feet, from the Pacific off the Northwest. It feels humid. Traced back 72 hours through NOAA’s hourly RAP analyses and the GFS beyond them, nine paths at each of three heights.

MILE2
THE GROUND

What Irwin stands on

Irwin’s center stands about 510 ft above sea level. Within three miles the land runs from 410 ft to 610 ft, a difference of 200 ft: gently rolling country.

Under the town center the state geologic map shows Persimmon Fork Formation (metavolcanic), from the Neoproterozoic to Cambrian, 487 to 1,000 million years old.

The section below crosses 5 rock units mapped at the surface.

Great Falls to JAARS, cut in half

A section southwest to northeast, 24 miles through the town center
300 ft400 ft500 ft600 ft IRWIN510 ftCatawba Riverabout 300 ftJAARS580 ft ← SW · Great FallsJAARS · NE →

Heights every 0.1 mile from the Copernicus GLO-90 surface model; vertical exaggeration about 53×. The colored band under the surface is the rock the state geologic map shows at the surface, not a picture of what lies beneath.

Rock at the surface along the line

Persimmon Fork Formation

Metavolcanic. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 11 mi of the line.

Great Falls metagranite

Metagranite. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 6 mi of the line.

Phyllonite and phyllonitic schist

Phyllonite, schist. Age: Paleozoic, 252 to 542 million years old. About 5 mi of the line.

Metamorphosed Mafic Rock

Metagabbro, metadiorite. Age: Neoproterozoic to Paleozoic, 252 to 1,000 million years old. About 2 mi of the line.

Felsic Metavolcanic Rock

Metadacite, metarhyolite, metavolcanic. Age: Neoproterozoic to Cambrian, 487 to 1,000 million years old. About 0.7 mi of the line.

From the USGS State Geologic Map Compilation (Horton and others, 2017), the states’ geologic maps joined at a common scale.

Heights from Copernicus GLO-90 (a surface model: it includes buildings and tree canopy); summits from USGS GNIS; rivers from USGS NHDPlus HR; rock from the USGS State Geologic Map Compilation.
MILE3
THE WATER

Where Irwin’s rain goes

A raindrop that lands in Irwin reaches the Atlantic Ocean by way of Cane Creek, the Catawba, the Wateree, the Congaree, the Santee and the South Santee: about 250 river miles.

THE WAY DOWN, TO SCALE
Irwin≈ 250 mi · the Atlantic Ocean
FROM THE CENTER OF IRWIN ≈ 250 mi to the Atlantic Ocean Cane Creek → Catawba → Wateree → Congaree → Santee → South Santee

Lake on the way: Lib Pines Lake.

90 miles of the trip are on the Wateree.

Traced down the USGS NHDPlus V2.1 river network from the Census center point of Irwin; river miles along the main stem, rounded.

MILE7
ON THE NETWORK

Around Irwin on the Forecast Network

Neighboring plates

Rock Hill SC · 20 MI 20 miles northwest Charlotte NC · 36 MI 36 miles north Winston-Salem NC · 102 MI 102 miles north Greensboro NC · 112 MI 112 miles northeast Durham NC · 140 MI 140 miles northeast Raleigh NC · 146 MI 146 miles northeast
FORECASTCITY
Map of Irwin, South Carolina. Explore the plate
SOUTH CAROLINA · LANCASTER

Irwin

1,321 people, 510 ft above sea level in Lancaster County.

510 ftElevation
1,321People
3 sq miLand
Sunny 55°
SunnyDew point 30°
1

Today in Irwin

NEXT 15 HOURS
Now mostly sunny 55° 0%
5p clear night 51° 0%
8p clear night 41° 0%
11p clear night 37° 0%
2a clear night 34° 0%
5a clear night 32° 0%
Clear
NEXT RAINNone this week
→
Sat0%
Mostly sunny Mostly sunny
31
55
A
Sun0%
Sunny Sunny
33
57
A
Mon0%
Sunny Sunny
33
58
A
Tue0%
Sunny Sunny
34
61
B
Wed0%
Sunny Sunny
34
64
B
Thu0%
Mostly sunny Mostly sunny
38
69
A
Fri0%
Mostly sunny Mostly sunny
40
70
B
Letters show how sure the forecast is: A, models agree; B, some spread; C, check back. Sample data.
2

What Irwin stands on

Irwin’s center stands about 510 ft above sea level. Within three miles the land runs from 410 ft to 610 ft, a difference of 200 ft: gently rolling country.

Irwin, southwest to northeast Irwin510 ftCatawba Riverabout 300 ft ← SWNE → 24 miles through the town center; vertical exaggeration about 101×. Colors: rock at the surface.
Elevation, center510 ft
Within 3 miles410 to 610 ft
Lie of the landGently rolling (200 ft of relief)
Rock at the surfacePersimmon Fork Formation
Its ageNeoproterozoic to Cambrian, 487 to 1,000 million years old
3

Where the rain goes

≈ 250 mito the Atlantic OceanCane Creek → Catawba → Wateree → Congaree → Santee → South Santee

A raindrop that lands in Irwin reaches the Atlantic Ocean by way of Cane Creek, the Catawba, the Wateree, the Congaree, the Santee and the South Santee: about 250 river miles.

Lake on the way: Lib Pines Lake.

90 miles of the trip are on the Wateree.