Rennes-Saint-Jacques Airport

LFRN / RNS

Saint-Jacques-de-la-Lande, Ille-et-Vilaine, FR

Current TAF Forecast

Raw TAF:
TAF LFRN 142300Z 1500/1524 VRB05KT 9999 BKN040 PROB40 TEMPO 1501/1506 3000 BR PROB30 TEMPO 1503/1506 0500 FG TEMPO 1508/1513 4000 SHRA BKN025TCU SCT030CB BECMG 1510/1512 35010KT PROB40 TEMPO 1510/1515 34015G25KT BECMG 1519/1522 VRB05KT

Detailed TAF Table

Parameter
Fri
01:00Z
+-1h
Fri
02:00Z
+0h
Fri
03:00Z
+1h
Fri
04:00Z
+2h
Fri
05:00Z
+3h
Fri
06:00Z
+4h
Fri
07:00Z
+5h
Fri
08:00Z
+6h
Fri
09:00Z
+7h
Fri
10:00Z
+8h
Fri
11:00Z
+9h
Fri
12:00Z
+10h
Fri
13:00Z
+11h
Fri
14:00Z
+12h
Fri
15:00Z
+13h
Fri
16:00Z
+14h
Fri
17:00Z
+15h
Fri
18:00Z
+16h
Fri
19:00Z
+17h
Fri
20:00Z
+18h
Fri
21:00Z
+19h
Fri
22:00Z
+20h
Wind Dir
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
340°
N
340°
N
340°
N
340°
N
340°
N
350°
N
350°
N
350°
N
350°
N
VRB
VRB
VRB
VRB
Wind Speed
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
15 kt
G25 kt
15 kt
G25 kt
15 kt
G25 kt
15 kt
G25 kt
15 kt
G25 kt
10 kt
10 kt
10 kt
10 kt
5 kt
5 kt
5 kt
5 kt
Visibility
10+ km
10+ km
0.5 km
0.5 km
0.5 km
10+ km
10+ km
4 km
4 km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
Weather
☀️ Clear
☀️ Clear
Fog
FG
30%
Fog
FG
30%
Fog
FG
30%
☀️ Clear
☀️ Clear
Showers Rain
SHRA
Showers Rain
SHRA
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Clouds
BKN040
BKN040
☀️ CLR
☀️ CLR
☀️ CLR
BKN040
BKN040
BKN025TCU
SCT030CB
BKN025TCU
SCT030CB
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
Ceiling
4,000 ft
AGL
4,000 ft
AGL
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
4,000 ft
AGL
4,000 ft
AGL
2,500 ft
AGL
2,500 ft
AGL
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
Flight Rules VFR VFR LIFR LIFR LIFR VFR VFR IFR IFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR
Day/Night
🌙
Night
🌙
Night
🌅 04:49Z
🌙
Night
🌅 04:49Z
🌙
Night
🌅 04:49Z
☀️
Day
🌅 04:49Z
☀️
Day
🌅 04:49Z
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
🌇 19:10Z
☀️
Day
🌇 19:10Z
☀️
Day
🌇 19:10Z
🌙
Night
🌇 19:10Z
🌙
Night
🌇 19:10Z
🌙
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
VFR
Wind
VRB° at 5 kt
Visibility
10+ km
Clouds
BKN040
📖 Plain English Explanation:

This is the base forecast condition. Winds will be variable in direction at 5 kt. Visibility will be excellent at 10+ km. Broken clouds at 4000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

PROB40 TEMPO 01:00Z - 06:00Z
IFR
Visibility
3 km
Weather
Mist
📖 Plain English Explanation:

There is a 40% probability of: Visibility will be moderate at 3 km. Weather conditions: Mist. Instrument Flight Rules (IFR) conditions - instrument flying required.

PROB30 TEMPO 03:00Z - 06:00Z
LIFR
Visibility
0.5 km
Weather
Fog
📖 Plain English Explanation:

There is a 30% probability of: Visibility will be poor at 0.5 km. Weather conditions: Fog. Low IFR conditions - challenging even for instrument operations.

TEMPO 08:00Z - 13:00Z
IFR
Visibility
4 km
Weather
Showers Rain
Clouds
BKN025TCU SCT030CB
📖 Plain English Explanation:

Temporary conditions (lasting less than an hour at a time) may include: Visibility will be moderate at 4 km. Weather conditions: Showers Rain. Broken clouds at 2500 feet, Scattered clouds at 3000 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

BECMG 10:00Z - 12:00Z
VFR
Wind
350° at 10 kt
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the North (350°) at 10 kt. Conditions will be suitable for Visual Flight Rules (VFR) operations.

PROB40 TEMPO 10:00Z - 15:00Z
VFR
Wind
340° at 15 kt
Gusts: 25 kt
📖 Plain English Explanation:

There is a 40% probability of: Winds from the North-Northwest (340°) at 15 kt. Gusts up to 25 kt are expected. Conditions will be suitable for Visual Flight Rules (VFR) operations.

BECMG 19:00Z - 22:00Z
VFR
Wind
VRB° at 5 kt
📖 Plain English Explanation:

Conditions will gradually change to become: Winds will be variable in direction at 5 kt. 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.