Gray Army Air Field

KGRF / GRF

Fort Lewis/Tacoma, US

Current TAF Forecast

Raw TAF:
TAF KGRF 042100Z 0421/0603 18010G15KT 9999 VCSH BKN015 OVC020 620509 QNH2986INS BECMG 0423/0424 21009KT 9999 NSW BKN030 OVC050 620457 QNH2998INS BECMG 0511/0512 24009KT 9000 -RA BKN020 OVC025 620353 QNH3008INS BECMG 0519/0520 24006KT 9999 NSW BKN030 600302 QNH3029INS TX12/0500Z TN05/0515Z

Detailed TAF Table

Parameter
Thu
04:00Z
+-1h
Thu
05:00Z
+0h
Thu
06:00Z
+1h
Thu
07:00Z
+2h
Thu
08:00Z
+3h
Thu
09:00Z
+4h
Thu
10:00Z
+5h
Thu
11:00Z
+6h
Thu
12:00Z
+7h
Thu
13:00Z
+8h
Thu
14:00Z
+9h
Thu
15:00Z
+10h
Thu
16:00Z
+11h
Thu
17:00Z
+12h
Thu
18:00Z
+13h
Thu
19:00Z
+14h
Thu
20:00Z
+15h
Thu
21:00Z
+16h
Thu
22:00Z
+17h
Thu
23:00Z
+18h
Fri
00:00Z
+19h
Fri
01:00Z
+20h
Wind Dir
180°
S
180°
S
180°
S
180°
S
180°
S
180°
S
180°
S
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
Wind Speed
10 kt
G15 kt
10 kt
G15 kt
10 kt
G15 kt
10 kt
G15 kt
10 kt
G15 kt
10 kt
G15 kt
10 kt
G15 kt
9 kt
G15 kt
9 kt
G15 kt
9 kt
G15 kt
9 kt
G15 kt
9 kt
G15 kt
9 kt
G15 kt
9 kt
G15 kt
9 kt
G15 kt
6 kt
G15 kt
6 kt
G15 kt
6 kt
G15 kt
6 kt
G15 kt
6 kt
G15 kt
6 kt
G15 kt
6 kt
G15 kt
Visibility
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
Weather
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Clouds
BKN015
OVC020
BKN015
OVC020
BKN015
OVC020
BKN015
OVC020
BKN015
OVC020
BKN015
OVC020
BKN015
OVC020
BKN020
OVC025
BKN020
OVC025
BKN020
OVC025
BKN020
OVC025
BKN020
OVC025
BKN020
OVC025
BKN020
OVC025
BKN020
OVC025
BKN030
BKN030
BKN030
BKN030
BKN030
BKN030
BKN030
Ceiling
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
2,000 ft
AGL
2,000 ft
AGL
2,000 ft
AGL
2,000 ft
AGL
2,000 ft
AGL
2,000 ft
AGL
2,000 ft
AGL
2,000 ft
AGL
3,000 ft
AGL
3,000 ft
AGL
3,000 ft
AGL
3,000 ft
AGL
3,000 ft
AGL
3,000 ft
AGL
3,000 ft
AGL
Flight Rules MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR VFR VFR VFR VFR VFR VFR VFR
Day/Night
🌙
Night
🌅 06:26Z
🌙
Night
🌅 06:26Z
🌅
Dawn
🌅 06:26Z
☀️
Day
🌅 06:26Z
☀️
Day
🌅 06:26Z
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
🌇 17:33Z
☀️
Day
🌇 17:33Z
☀️
Day
🌇 17:33Z
🌇
Dusk
🌇 17:33Z
🌙
Night
🌇 17:33Z
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
Flight Rules
VFR: Visual Flight Rules
MVFR: Marginal VFR
IFR: Instrument Flight Rules
LIFR: Low IFR
Ceiling Colors
Red: < 500ft
Amber: 500-1000ft
Blue: 1000-3000ft
Green: > 3000ft
⛈️ TCU: Towering Cumulus
🌩️ CB: Cumulonimbus
+Nh: Hours from now%: Probability of occurrenceAGL: Above Ground Level

Forecast Periods

BASE
MVFR
Wind
180° at 10 kt
Gusts: 15 kt
Visibility
10+ km
Clouds
BKN015 OVC020
📖 Plain English Explanation:

This is the base forecast condition. Winds from the South (180°) at 10 kt. Gusts up to 15 kt are expected. Visibility will be excellent at 10+ km. Broken clouds at 1500 feet, Overcast skies at 2000 feet. Marginal VFR conditions - some restrictions for visual flying.

BECMG 23:00Z - 00:00Z
VFR
Wind
210° at 9 kt
Visibility
10+ km
Clouds
BKN030 OVC050
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the South-Southwest (210°) at 9 kt. Visibility will be excellent at 10+ km. Broken clouds at 3000 feet, Overcast skies at 5000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

BECMG 11:00Z - 12:00Z
MVFR
Wind
240° at 9 kt
Visibility
9 km
Weather
Light Rain
Clouds
BKN020 OVC025
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the West-Southwest (240°) at 9 kt. Visibility will be good at 9 km. Weather conditions: Light Rain. Broken clouds at 2000 feet, Overcast skies at 2500 feet. Marginal VFR conditions - some restrictions for visual flying.

BECMG 19:00Z - 20:00Z
VFR
Wind
240° at 6 kt
Visibility
10+ km
Clouds
BKN030
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the West-Southwest (240°) at 6 kt. Visibility will be excellent at 10+ km. Broken clouds at 3000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

📚 Understanding TAF Forecasts

Terminal Aerodrome Forecast (TAF) provides detailed weather forecasts specifically for aviation operations. Our system translates complex meteorological codes into plain English to help pilots of all experience levels understand forecasted conditions.

What TAF Includes:

  • • Wind direction, speed, and gusts
  • • Visibility in statute miles or kilometers
  • • Weather phenomena (rain, snow, fog, thunderstorms)
  • • Cloud coverage types and altitudes
  • • Forecast changes with timing
  • • Flight rules categories (VFR/IFR)

Change Indicators Explained:

  • BASE - Main forecast conditions
  • FM - Permanent change from specific time
  • BECMG - Gradual change over 2-4 hours
  • TEMPO - Temporary changes (less than 1 hour)
  • PROB30/40 - 30% or 40% probability

🛩️ Flight Rules Categories

VFR

Visual Flight Rules

  • • Ceiling ≥ 3000 ft
  • • Visibility ≥ 5 miles
  • • Good for visual flying

MVFR

Marginal VFR

  • • Ceiling 1000-3000 ft
  • • Visibility 3-5 miles
  • • Caution for VFR

IFR

Instrument Flight Rules

  • • Ceiling 500-1000 ft
  • • Visibility 1-3 miles
  • • Instruments required

LIFR

Low IFR

  • • Ceiling < 500 ft
  • • Visibility < 1 mile
  • • Challenging conditions

💡 TAF Reading Tips

For Student Pilots:

  • • Focus on the plain English explanations above
  • • Pay attention to flight rules categories
  • • Look for wind direction relative to runway headings
  • • Check for temporary conditions (TEMPO)

For Experienced Pilots:

  • • Cross-reference with raw TAF for precise timing
  • • Consider probability forecasts for alternate planning
  • • Monitor BECMG periods for gradual changes
  • • Always check current METAR vs TAF forecast

Important: TAF forecasts should always be supplemented with current METAR observations, PIREPs, and other weather information for complete situational awareness. Weather can change rapidly, and forecasts have inherent limitations.