Gray Army Air Field

KGRF / GRF

Fort Lewis/Tacoma, US

Current TAF Forecast

Raw TAF:
TAF KGRF 081300Z 0813/0919 12006KT 9999 BKN050 OVC090 QNH2981INS BECMG 0815/0816 12006KT 9999 VCSH BKN040 OVC080 QNH2975INS BECMG 0818/0819 14010G15KT 9000 -RA BKN030 OVC040 620709 QNH2966INS BECMG 0821/0822 14006KT 6000 RA BKN012 OVC015 620505 QNH2968INS BECMG 0901/0902 17012KT 9000 -RA OVC015 620808 QNH2955INS TEMPO 0902/0905 4800 -DZ BKN007 BECMG 0906/0907 17015G20KT 9999 VCSH BKN015 OVC040 620808 QNH2958INS BECMG 0908/0909 19010KT 9000 -RA OVC012 620805 QNH2960INS BECMG 0914/0915 12009KT 9999 NSW BKN020 QNH2957INS TX15/0820Z TN10/0813Z

Detailed TAF Table

Parameter
Mon
18:00Z
+-1h
Mon
19:00Z
+0h
Mon
20:00Z
+1h
Mon
21:00Z
+2h
Mon
22:00Z
+3h
Mon
23:00Z
+4h
Tue
00:00Z
+5h
Tue
01:00Z
+6h
Tue
02:00Z
+7h
Tue
03:00Z
+8h
Tue
04:00Z
+9h
Tue
05:00Z
+10h
Tue
06:00Z
+11h
Tue
07:00Z
+12h
Tue
08:00Z
+13h
Tue
09:00Z
+14h
Tue
10:00Z
+15h
Tue
11:00Z
+16h
Tue
12:00Z
+17h
Tue
13:00Z
+18h
Tue
14:00Z
+19h
Tue
15:00Z
+20h
Tue
16:00Z
+21h
Tue
17:00Z
+22h
Wind Dir
120°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
Wind Speed
6 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
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
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
10 kt
G15 kt
10 kt
G15 kt
10 kt
G15 kt
Visibility
10+ km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
4.8 km
4.8 km
4.8 km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
9 km
Weather
☀️ Clear
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Drizzle
-DZ
Light Drizzle
-DZ
Light Drizzle
-DZ
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Light Rain
-RA
Clouds
BKN050
OVC090
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN007
BKN007
BKN007
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
BKN030
OVC040
Ceiling
5,000 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
700 ft
AGL
700 ft
AGL
700 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
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 VFR VFR VFR VFR VFR VFR VFR VFR IFR IFR IFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR
Day/Night
☀️
Day
🌇 19:25Z
☀️
Day
🌇 19:25Z
🌙
Night
🌇 19:25Z
🌙
Night
🌇 19:25Z
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌅 04:34Z
🌙
Night
🌅 04:34Z
🌙
Night
🌅 04:34Z
☀️
Day
🌅 04:34Z
☀️
Day
🌅 04:34Z
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
🌇 19:25Z
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 occurrence • AGL: Above Ground Level

Forecast Periods

BASE
VFR
Wind
120° at 6 kt
Visibility
10+ km
Clouds
BKN050 OVC090
📖 Plain English Explanation:

This is the base forecast condition. Winds from the East-Southeast (120°) at 6 kt. Visibility will be excellent at 10+ km. Broken clouds at 5000 feet, Overcast skies at 9000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

BECMG 15:00Z - 16:00Z
VFR
Wind
120° at 6 kt
Visibility
10+ km
Clouds
BKN040 OVC080
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the East-Southeast (120°) at 6 kt. Visibility will be excellent at 10+ km. Broken clouds at 4000 feet, Overcast skies at 8000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

BECMG 18:00Z - 19:00Z
VFR
Wind
140° at 10 kt
Gusts: 15 kt
Visibility
9 km
Weather
Light Rain
Clouds
BKN030 OVC040
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the Southeast (140°) at 10 kt. Gusts up to 15 kt are expected. Visibility will be good at 9 km. Weather conditions: Light Rain. Broken clouds at 3000 feet, Overcast skies at 4000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

BECMG 21:00Z - 22:00Z
IFR
Wind
140° at 6 kt
Visibility
6 km
Weather
Rain
Clouds
BKN012 OVC015
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the Southeast (140°) at 6 kt. Visibility will be good at 6 km. Weather conditions: Rain. Broken clouds at 1200 feet, Overcast skies at 1500 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

BECMG 01:00Z - 02:00Z
MVFR
Wind
170° at 12 kt
Visibility
9 km
Weather
Light Rain
Clouds
OVC015
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the South (170°) at 12 kt. Visibility will be good at 9 km. Weather conditions: Light Rain. Overcast skies at 1500 feet. Marginal VFR conditions - some restrictions for visual flying.

TEMPO 02:00Z - 05:00Z
IFR
Visibility
4.8 km
Weather
Light Drizzle
Clouds
BKN007
📖 Plain English Explanation:

Temporary conditions (lasting less than an hour at a time) may include: Visibility will be moderate at 4.8 km. Weather conditions: Light Drizzle. Broken clouds at 700 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

BECMG 06:00Z - 07:00Z
MVFR
Wind
170° at 15 kt
Gusts: 20 kt
Visibility
10+ km
Clouds
BKN015 OVC040
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the South (170°) at 15 kt. Gusts up to 20 kt are expected. Visibility will be excellent at 10+ km. Broken clouds at 1500 feet, Overcast skies at 4000 feet. Marginal VFR conditions - some restrictions for visual flying.

BECMG 08:00Z - 09:00Z
IFR
Wind
190° at 10 kt
Visibility
9 km
Weather
Light Rain
Clouds
OVC012
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the South (190°) at 10 kt. Visibility will be good at 9 km. Weather conditions: Light Rain. Overcast skies at 1200 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

BECMG 14:00Z - 15:00Z
MVFR
Wind
120° at 9 kt
Visibility
10+ km
Clouds
BKN020
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the East-Southeast (120°) at 9 kt. Visibility will be excellent at 10+ km. Broken clouds at 2000 feet. Marginal VFR conditions - some restrictions for visual flying.

📚 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.