Excessive Heat Warning — Adams, MS, Grenada, MS, Carroll, MS, Holmes, MS, Issaquena, MS, Sharkey, MS, Yazoo, MS, Madison, MS, Warren, MS, Hinds, MS, Rankin, MS, Claiborne, MS, Copiah, MS, Simpson, MS, Jefferson, MS, Bolivar, MS, Sunflower, MS, Leflore, MS, Washington, MS, Humphreys, MS, Montgomery, MS, Webster, MS, Clay, MS, Lowndes, MS, Choctaw, MS, Oktibbeha, MS, Attala, MS, Winston, MS, Noxubee, MS, Leake, MS, Neshoba, MS, Kemper, MS, Newton, MS, Lauderdale, MS, Scott, MS, Smith, MS, Jasper, MS, Clarke, MS, Franklin, MS, Lincoln, MS, Lawrence, MS, Jefferson Davis, MS, Covington, MS, Jones, MS, Marion, MS, Lamar, MS, Forrest, MS 9:00 PM

Simpson County, Mississippi, United States

Last updated: 9:39 PM CDT  ·  Refresh
30°C
Feels like 34°
Partly Cloudy
▲ 36°  /  ▼ 23°
Wind
3 mph NNE
Humidity
66%
Dew Point
23°
Pressure
29.51 inHg
Visibility
9 mi
UV Index
0.0
Cloud Cover
42%
Sunrise
6:07 AM
Sunset
8:04 PM
Drag to pan · double-click to forecast a point
WeatherAI™ Analysis

WeatherAI Analysis: Simpson County is currently partly cloudy at 30°C. Dry conditions are expected through the next 24 hours. Atmospheric instability is elevated (CAPE up to 2001 J/kg) — isolated convective development possible. Sunrise: 6:07AM · Sunset: 8:04PM.

Alerts

Excessive Heat Warning
Adams, MS, Grenada, MS, Carroll, MS, Holmes, MS, Issaquena, MS, Sharkey, MS, Yazoo, MS, Madison, MS, Warren, MS, Hinds, MS, Rankin, MS, Claiborne, MS, Copiah, MS, Simpson, MS, Jefferson, MS, Bolivar, MS, Sunflower, MS, Leflore, MS, Washington, MS, Humphreys, MS, Montgomery, MS, Webster, MS, Clay, MS, Lowndes, MS, Choctaw, MS, Oktibbeha, MS, Attala, MS, Winston, MS, Noxubee, MS, Leake, MS, Neshoba, MS, Kemper, MS, Newton, MS, Lauderdale, MS, Scott, MS, Smith, MS, Jasper, MS, Clarke, MS, Franklin, MS, Lincoln, MS, Lawrence, MS, Jefferson Davis, MS, Covington, MS, Jones, MS, Marion, MS, Lamar, MS, Forrest, MS
Expires 9:00 PM
67 AQI · Moderate Dominant: PM2.5 Air Quality
Hourly Forecast · Next 24 Hours
Now
30°
8%
10 PM
28°
25%
11 PM
27°
20%
12 AM
27°
30%
1 AM
26°
22%
2 AM
26°
23%
3 AM
25°
24%
4 AM
25°
17%
5 AM
24°
22%
6 AM
24°
17%
7 AM
26°
17%
8 AM
27°
13%
9 AM
31°
15%
10 AM
32°
15%
11 AM
33°
7%
12 PM
34°
5%
1 PM
35°
5%
2 PM
36°
5%
3 PM
36°
5%
4 PM
36°
3%
5 PM
36°
3%
6 PM
36°
3%
7 PM
35°
3%
8 PM
34°
3%
7-Day Forecast
Tonight
36° 23°
Partly Cloudy.
Tue
36° 24°
Mostly Clear with a 30% chance of rain.
Wed
38° 23°
Partly Cloudy.
Thu
36° 24°
Mostly Cloudy with a 60% chance of rain.
Fri
37° 24°
Clear.
Sat
37° 23°
Rain, 70% chance.
Sun
37° 22°
Rain, 64% chance.
TimeTempConditionsPrecipWindHumidity
Now 30° Partly Cloudy 8% 3 mph NNE 66%
10 PM 28° Mostly Cloudy 25% 3 mph NNE 70%
11 PM 27° Partly Cloudy 20% 3 mph NNE 72%
12 AM 27° Mostly Clear 30% 2 mph NE 75%
1 AM 26° Mostly Clear 22% 3 mph ENE 77%
2 AM 26° Mostly Clear 23% 2 mph ENE 78%
3 AM 25° Mostly Clear 24% 2 mph ENE 80%
4 AM 25° Mostly Clear 17% 3 mph E 81%
5 AM 24° Mostly Clear 22% 3 mph E 82%
6 AM 24° Mostly Clear 17% 3 mph ESE 82%
7 AM 26° Mostly Clear 17% 3 mph ESE 78%
8 AM 27° Mostly Clear 13% 3 mph E 72%
9 AM 31° Mostly Clear 15% 3 mph ENE 65%
10 AM 32° Mostly Clear 15% 4 mph NE 63%
11 AM 33° Mostly Clear 7% 5 mph NNE 61%
12 PM 34° Partly Cloudy 5% 6 mph NNE 56%
1 PM 35° Partly Cloudy 5% 6 mph NNE 54%
2 PM 36° Partly Cloudy 5% 7 mph NNE 53%
3 PM 36° Mostly Clear 5% 7 mph NNE 53%
4 PM 36° Mostly Clear 3% 7 mph NNE 54%
5 PM 36° Mostly Clear 3% 7 mph NNE 56%
6 PM 36° Mostly Clear 3% 7 mph NNE 59%
7 PM 35° Mostly Clear 3% 6 mph NE 61%
8 PM 34° Mostly Clear 3% 6 mph NE 62%
15-Day Forecast
Today
7/20
Partly Cloudy
8%
23°
36°
Tue
7/21
Mostly Clear
30%
24°
36°
Wed
7/22
Partly Cloudy
17%
23°
38°
Thu
7/23
Mostly Cloudy
60%
24°
36°
Fri
7/24
Clear
16%
24°
37°
Sat
7/25
Rain
70%
23°
37°
Sun
7/26
Rain
64%
22°
37°
Mon
7/27
Clear
17%
24°
38°
Tue
7/28
Drizzle
44%
24°
38°
Wed
7/29
Drizzle
44%
23°
38°
Thu
7/30
Drizzle
51%
23°
36°
Fri
7/31
Drizzle
60%
23°
37°
Sat
8/1
Drizzle
60%
22°
37°
Sun
8/2
Drizzle
60%
23°
37°
Mon
8/3
Drizzle
60%
22°
36°
67
Moderate
U.S. Air Quality Index · Dominant: PM2.5
50 100 150 200

Air quality is acceptable. Unusually sensitive people should consider limiting prolonged outdoor exertion.

Pollutant Breakdown · Today
PM2.5
Fine particulate matter
Dominant
67 AQI 17.6 µg/m³
O3
Ground-level ozone
31 AQI 34 ppb
3-Day Outlook
DayAQICategoryO₃PM2.5
Today 67 Moderate 31 67
Wed 63 Moderate 25 63
Thu 51 Moderate 27 51
About the Air Quality Index
0–50 Good
51–100 Moderate
101–150 Unhealthy for Sensitive Groups
151–200 Unhealthy
201–300 Very Unhealthy
301–500 Hazardous

The U.S. AQI runs 0–500. The overall value equals the highest individual pollutant sub-index, and the dominant pollutant is the one driving it. PM2.5 (fine particles) is reported in µg/m³ and ozone (O3) in ppb. Forecast source: NWS NAQFC.

1000850700500400300250200150100 -40-30-20-10010203040 0.41247101624 LCLLFCEL0°C Temperature (°C) Pressure (hPa)
Temp Dewpoint Parcel (SB) CAPE CIN Dry adiabat Moist adiabat Mixing ratio
RAP
Valid Tue Jul 21, 01:00'Z' · F0 · 130 (13 km CONUS/NA)
Hodograph · kt
10 20 30 40 SM
0–1 1–3 3–6 6–9 km
Instability
SBCAPE1430 J/kg
MLCAPE899 J/kg
MUCAPE1430 J/kg
SBCIN-149 J/kg
MLCIN0 J/kg
Lifted Index-3.6
Kinematics
0–6 km Shear22 kt
0–1 km Shear7 kt
Eff. Shear22 kt
0–1 km SRH-14
0–3 km SRH-27
Eff. SRH-27
Storm Motion352° @ 21 kt
0–1 km EHI-0.1
Composite Parameters
Sig. Tornado0.0
STP (eff)0.0
Supercell0.0
K-Index32.4
Thermo & Levels
PWAT1.99 in
0–3 km LR6.3 °C/km
700–500 LR5.4 °C/km
Total Totals45.3
LCL903 hPa
LFC824 hPa
EL163 hPa
Freezing Lvl16,703 ft