St. John's International Airport

CYYT / YYT

St. John's, CA

Current TAF Forecast

Raw TAF:
TAF CYYT 041740Z 0418/0518 18020G35KT 1/4SM +SN VV002 TEMPO 0418/0419 1SM -SNRA BR OVC006 FM041900 18020G38KT 1SM -RASN BR OVC004 TEMPO 0419/0421 6SM -RA BR OVC010 BECMG 0419/0421 30020G32KT FM042100 30020G32KT 5SM BR BKN008 TEMPO 0421/0424 P6SM NSW BKN012 FM050000 27018G30KT P6SM BKN012 BECMG 0500/0502 27022G38KT FM050500 27020G35KT P6SM BKN025 FM050900 30020G32KT 2 1/2SM -SHSN BLSN VV020 FM051400 31018G28KT P6SM BKN025 RMK NXT FCST BY 050000Z

Detailed TAF Table

Parameter
Wed
23:00Z
+-1h
Thu
00:00Z
+0h
Thu
01:00Z
+1h
Thu
02:00Z
+2h
Thu
03:00Z
+3h
Thu
04:00Z
+4h
Thu
05:00Z
+5h
Thu
06:00Z
+6h
Thu
07:00Z
+7h
Thu
08:00Z
+8h
Thu
09:00Z
+9h
Thu
10:00Z
+10h
Thu
11:00Z
+11h
Thu
12:00Z
+12h
Thu
13:00Z
+13h
Thu
14:00Z
+14h
Thu
15:00Z
+15h
Thu
16:00Z
+16h
Wind Dir
180°
S
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
Wind Speed
20 kt
G35 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
22 kt
G38 kt
Visibility
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
Weather
Heavy Snow
+SN
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Clouds
VV002
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
Ceiling
200 ft 🌫️
Indefinite
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
Flight Rules LIFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR
Day/Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌅 06:27Z
🌙
Night
🌅 06:27Z
🌅
Dawn
🌅 06:27Z
☀️
Day
🌅 06:27Z
☀️
Day
🌅 06:27Z
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
🌇 17:32Z
☀️
Day
🌇 17:32Z
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
LIFR
Wind
180° at 20 kt
Gusts: 35 kt
Visibility
1/4SM
Weather
Heavy Snow
Clouds
VV002
📖 Plain English Explanation:

This is the base forecast condition. Winds from the South (180°) at 20 kt. Gusts up to 35 kt are expected. Visibility will be moderate at 1/4SM. Weather conditions: Heavy Snow. Vertical visibility at 200 feet. Low IFR conditions - challenging even for instrument operations.

TEMPO 18:00Z - 19:00Z
IFR
Visibility
1SM
Weather
Light SNRA, Mist
Clouds
OVC006
📖 Plain English Explanation:

Temporary conditions (lasting less than an hour at a time) may include: Visibility will be moderate at 1SM. Weather conditions: Light SNRA, Mist. Overcast skies at 600 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

FM041900 19:00Z - 01:00Z
LIFR
Wind
180° at 20 kt
Gusts: 38 kt
Visibility
1SM
Weather
Light RASN, Mist
Clouds
OVC004
📖 Plain English Explanation:

Winds from the South (180°) at 20 kt. Gusts up to 38 kt are expected. Visibility will be moderate at 1SM. Weather conditions: Light RASN, Mist. Overcast skies at 400 feet. Low IFR conditions - challenging even for instrument operations.

TEMPO 19:00Z - 21:00Z
IFR
Visibility
6SM
Weather
Light Rain, Mist
Clouds
OVC010
📖 Plain English Explanation:

Temporary conditions (lasting less than an hour at a time) may include: Visibility will be excellent at 6SM. Weather conditions: Light Rain, Mist. Overcast skies at 1000 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

BECMG 19:00Z - 21:00Z
VFR
Wind
300° at 20 kt
Gusts: 32 kt
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the West-Northwest (300°) at 20 kt. Gusts up to 32 kt are expected. Conditions will be suitable for Visual Flight Rules (VFR) operations.

FM042100 21:00Z - 03:00Z
IFR
Wind
300° at 20 kt
Gusts: 32 kt
Visibility
5SM
Weather
Mist
Clouds
BKN008
📖 Plain English Explanation:

Winds from the West-Northwest (300°) at 20 kt. Gusts up to 32 kt are expected. Visibility will be good at 5SM. Weather conditions: Mist. Broken clouds at 800 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

TEMPO 21:00Z - 00:00Z
MVFR
Visibility
>6SM
Clouds
BKN012
📖 Plain English Explanation:

Temporary conditions (lasting less than an hour at a time) may include: Visibility will be excellent at more than 6SM. Broken clouds at 1200 feet. Marginal VFR conditions - some restrictions for visual flying.

FM050000 00:00Z - 06:00Z
MVFR
Wind
270° at 18 kt
Gusts: 30 kt
Visibility
>6SM
Clouds
BKN012
📖 Plain English Explanation:

Winds from the West (270°) at 18 kt. Gusts up to 30 kt are expected. Visibility will be excellent at more than 6SM. Broken clouds at 1200 feet. Marginal VFR conditions - some restrictions for visual flying.

BECMG 00:00Z - 02:00Z
VFR
Wind
270° at 22 kt
Gusts: 38 kt
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the West (270°) at 22 kt. Gusts up to 38 kt are expected. Conditions will be suitable for Visual Flight Rules (VFR) operations.

FM050500 05:00Z - 11:00Z
MVFR
Wind
270° at 20 kt
Gusts: 35 kt
Visibility
>6SM
Clouds
BKN025
📖 Plain English Explanation:

Winds from the West (270°) at 20 kt. Gusts up to 35 kt are expected. Visibility will be excellent at more than 6SM. Broken clouds at 2500 feet. Marginal VFR conditions - some restrictions for visual flying.

FM050900 09:00Z - 15:00Z
IFR
Wind
300° at 20 kt
Gusts: 32 kt
Visibility
1/2SM
Weather
Light Showers Snow, Blowing Snow
Clouds
VV020
📖 Plain English Explanation:

Winds from the West-Northwest (300°) at 20 kt. Gusts up to 32 kt are expected. Visibility will be moderate at 1/2SM. Weather conditions: Light Showers Snow, Blowing Snow. Vertical visibility at 2000 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

FM051400 14:00Z - 20:00Z
MVFR
Wind
310° at 18 kt
Gusts: 28 kt
Visibility
>6SM
Weather
FCST
Clouds
BKN025
📖 Plain English Explanation:

Winds from the Northwest (310°) at 18 kt. Gusts up to 28 kt are expected. Visibility will be excellent at more than 6SM. Weather conditions: FCST. Broken clouds at 2500 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.