Portland Troutdale Airport

KTTD / TTD

Portland, US

Current TAF Forecast

Raw TAF:
TAF KTTD 081131Z 0812/0912 VRB03KT P6SM OVC070 FM081500 11005KT P6SM -RA FEW025 OVC050 FM082000 09007KT P6SM -RA SCT015 OVC025 FM082100 11010KT 4SM RA BR SCT010 OVC015 FM090100 18010G23KT 6SM -SHRA BR SCT010 OVC015

Detailed TAF Table

Parameter
Mon
16:00Z
+-1h
Mon
17:00Z
+0h
Mon
18:00Z
+1h
Mon
19:00Z
+2h
Mon
20:00Z
+3h
Mon
21:00Z
+4h
Mon
22:00Z
+5h
Mon
23:00Z
+6h
Tue
00:00Z
+7h
Tue
01:00Z
+8h
Tue
02:00Z
+9h
Tue
03:00Z
+10h
Tue
04:00Z
+11h
Tue
05:00Z
+12h
Tue
06:00Z
+13h
Tue
07:00Z
+14h
Tue
08:00Z
+15h
Tue
09:00Z
+16h
Tue
10:00Z
+17h
Wind Dir
VRB
VRB
VRB
VRB
90°
E
110°
E
110°
E
110°
E
110°
E
180°
S
180°
S
180°
S
180°
S
180°
S
180°
S
VRB
VRB
VRB
VRB
Wind Speed
3 kt
3 kt
3 kt
3 kt
7 kt
10 kt
10 kt
10 kt
10 kt
10 kt
G23 kt
10 kt
G23 kt
10 kt
G23 kt
10 kt
G23 kt
10 kt
G23 kt
10 kt
G23 kt
3 kt
3 kt
3 kt
3 kt
Visibility
>6SM
>6SM
>6SM
>6SM
>6SM
4SM
4SM
4SM
4SM
6SM
6SM
6SM
6SM
6SM
6SM
>6SM
>6SM
>6SM
>6SM
Weather
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Light Rain
-RA
Rain, Mist
RA BR
Rain, Mist
RA BR
Rain, Mist
RA BR
Rain, Mist
RA BR
Light Showers Rain, Mist
-SHRA BR
Light Showers Rain, Mist
-SHRA BR
Light Showers Rain, Mist
-SHRA BR
Light Showers Rain, Mist
-SHRA BR
Light Showers Rain, Mist
-SHRA BR
Light Showers Rain, Mist
-SHRA BR
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Clouds
OVC070
OVC070
OVC070
OVC070
SCT015
OVC025
SCT010
OVC015
SCT010
OVC015
SCT010
OVC015
SCT010
OVC015
SCT010
OVC015
SCT010
OVC015
SCT010
OVC015
SCT010
OVC015
SCT010
OVC015
SCT010
OVC015
OVC070
OVC070
OVC070
OVC070
Ceiling
7,000 ft
AGL
7,000 ft
AGL
7,000 ft
AGL
7,000 ft
AGL
2,500 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
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
7,000 ft
AGL
7,000 ft
AGL
7,000 ft
AGL
7,000 ft
AGL
Flight Rules VFR VFR VFR VFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR VFR VFR VFR VFR
Day/Night
☀️
Day
☀️
Day
🌇 19:23Z
☀️
Day
🌇 19:23Z
☀️
Day
🌇 19:23Z
🌙
Night
🌇 19:23Z
🌙
Night
🌇 19:23Z
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌅 04:36Z
🌙
Night
🌅 04:36Z
🌙
Night
🌅 04:36Z
☀️
Day
🌅 04:36Z
☀️
Day
🌅 04:36Z
☀️
Day
☀️
Day
☀️
Day
☀️
Day
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
VFR
Wind
VRB° at 3 kt
Visibility
>6SM
Clouds
OVC070
📖 Plain English Explanation:

This is the base forecast condition. Winds will be variable in direction at 3 kt. Visibility will be excellent at more than 6SM. Overcast skies at 7000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

FM081500 15:00Z - 21:00Z
VFR
Wind
110° at 5 kt
Visibility
>6SM
Weather
Light Rain
Clouds
FEW025 OVC050
📖 Plain English Explanation:

Winds from the East-Southeast (110°) at 5 kt. Visibility will be excellent at more than 6SM. Weather conditions: Light Rain. Few clouds at 2500 feet, Overcast skies at 5000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

FM082000 20:00Z - 02:00Z
MVFR
Wind
90° at 7 kt
Visibility
>6SM
Weather
Light Rain
Clouds
SCT015 OVC025
📖 Plain English Explanation:

Winds from the East (90°) at 7 kt. Visibility will be excellent at more than 6SM. Weather conditions: Light Rain. Scattered clouds at 1500 feet, Overcast skies at 2500 feet. Marginal VFR conditions - some restrictions for visual flying.

FM082100 21:00Z - 03:00Z
MVFR
Wind
110° at 10 kt
Visibility
4SM
Weather
Rain, Mist
Clouds
SCT010 OVC015
📖 Plain English Explanation:

Winds from the East-Southeast (110°) at 10 kt. Visibility will be good at 4SM. Weather conditions: Rain, Mist. Scattered clouds at 1000 feet, Overcast skies at 1500 feet. Marginal VFR conditions - some restrictions for visual flying.

FM090100 01:00Z - 07:00Z
MVFR
Wind
180° at 10 kt
Gusts: 23 kt
Visibility
6SM
Weather
Light Showers Rain, Mist
Clouds
SCT010 OVC015
📖 Plain English Explanation:

Winds from the South (180°) at 10 kt. Gusts up to 23 kt are expected. Visibility will be excellent at 6SM. Weather conditions: Light Showers Rain, Mist. Scattered clouds at 1000 feet, Overcast skies at 1500 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.