Grenoble Alpes Isère Airport

LFLS / GNB

Grenoble, FR

Current TAF Forecast

Raw TAF:
TAF LFLS 141400Z 1415/1515 VRB05KT 9999 SCT040 BKN060 TEMPO 1415/1420 VRB15G25KT 4000 SHRA BKN037TCU PROB40 TEMPO 1415/1419 VRB20G35KT 1500 TSRAGS BKN013 BKN033CB BECMG 1420/1422 09005KT BECMG 1505/1507 35006KT TEMPO 1512/1515 34015G25KT 4000 SHRA BKN040TCU PROB30 TEMPO 1512/1515 2000 TSRAGS BKN030CB

Detailed TAF Table

Parameter
Thu
15:00Z
+-1h
Thu
16:00Z
+0h
Thu
17:00Z
+1h
Thu
18:00Z
+2h
Thu
19:00Z
+3h
Thu
20:00Z
+4h
Thu
21:00Z
+5h
Thu
22:00Z
+6h
Thu
23:00Z
+7h
Fri
00:00Z
+8h
Fri
01:00Z
+9h
Fri
02:00Z
+10h
Fri
03:00Z
+11h
Fri
04:00Z
+12h
Fri
05:00Z
+13h
Fri
06:00Z
+14h
Fri
07:00Z
+15h
Fri
08:00Z
+16h
Fri
09:00Z
+17h
Fri
10:00Z
+18h
Fri
11:00Z
+19h
Fri
12:00Z
+20h
Fri
13:00Z
+21h
Wind Dir
VRB
VRB
VRB
VRB
VRB
90°
E
90°
E
90°
E
90°
E
90°
E
90°
E
90°
E
90°
E
90°
E
350°
N
350°
N
350°
N
350°
N
350°
N
350°
N
350°
N
350°
N
350°
N
Wind Speed
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
6 kt
6 kt
6 kt
6 kt
6 kt
6 kt
6 kt
6 kt
G25 kt
6 kt
G25 kt
Visibility
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
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
10+ km
2 km
2 km
Weather
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Thunderstorm RAGS
TSRAGS
30%
Thunderstorm RAGS
TSRAGS
30%
Clouds
SCT040
BKN060
SCT040
BKN060
SCT040
BKN060
SCT040
BKN060
SCT040
BKN060
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
☀️ CLR
BKN030CB
BKN030CB
Ceiling
6,000 ft
AGL
6,000 ft
AGL
6,000 ft
AGL
6,000 ft
AGL
6,000 ft
AGL
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
3,000 ft
AGL
3,000 ft
AGL
Flight Rules VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR VFR IFR IFR
Day/Night
☀️
Day
☀️
Day
☀️
Day
🌇 19:06Z
☀️
Day
🌇 19:06Z
☀️
Day
🌇 19:06Z
🌙
Night
🌇 19:06Z
🌙
Night
🌇 19:06Z
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌅 04:52Z
🌙
Night
🌅 04:52Z
🌙
Night
🌅 04:52Z
☀️
Day
🌅 04:52Z
☀️
Day
🌅 04:52Z
☀️
Day
☀️
Day
☀️
Day
☀️
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 5 kt
Visibility
10+ km
Clouds
SCT040 BKN060
📖 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. Scattered clouds at 4000 feet, Broken clouds at 6000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

TEMPO 15:00Z - 20:00Z
IFR
Wind
VRB° at 15 kt
Gusts: 25 kt
Visibility
4 km
Weather
Showers Rain
Clouds
BKN037TCU
📖 Plain English Explanation:

Temporary conditions (lasting less than an hour at a time) may include: Winds will be variable in direction at 15 kt. Gusts up to 25 kt are expected. Visibility will be moderate at 4 km. Weather conditions: Showers Rain. Broken clouds at 3700 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

PROB40 TEMPO 15:00Z - 19:00Z
LIFR
Wind
VRB° at 20 kt
Gusts: 35 kt
Visibility
1.5 km
Weather
Thunderstorm RAGS
Clouds
BKN013 BKN033CB
📖 Plain English Explanation:

There is a 40% probability of: Winds will be variable in direction at 20 kt. Gusts up to 35 kt are expected. Visibility will be moderate at 1.5 km. Weather conditions: Thunderstorm RAGS. Broken clouds at 1300 feet, Broken clouds at 3300 feet. Low IFR conditions - challenging even for instrument operations.

BECMG 20:00Z - 22:00Z
VFR
Wind
90° at 5 kt
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the East (90°) at 5 kt. Conditions will be suitable for Visual Flight Rules (VFR) operations.

BECMG 05:00Z - 07:00Z
VFR
Wind
350° at 6 kt
📖 Plain English Explanation:

Conditions will gradually change to become: Winds from the North (350°) at 6 kt. Conditions will be suitable for Visual Flight Rules (VFR) operations.

TEMPO 12:00Z - 15:00Z
IFR
Wind
340° at 15 kt
Gusts: 25 kt
Visibility
4 km
Weather
Showers Rain
Clouds
BKN040TCU
📖 Plain English Explanation:

Temporary conditions (lasting less than an hour at a time) may include: Winds from the North-Northwest (340°) at 15 kt. Gusts up to 25 kt are expected. Visibility will be moderate at 4 km. Weather conditions: Showers Rain. Broken clouds at 4000 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

PROB30 TEMPO 12:00Z - 15:00Z
IFR
Visibility
2 km
Weather
Thunderstorm RAGS
Clouds
BKN030CB
📖 Plain English Explanation:

There is a 30% probability of: Visibility will be moderate at 2 km. Weather conditions: Thunderstorm RAGS. Broken clouds at 3000 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

📚 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.