John Murtha Johnstown Cambria County Airport

KJST / JST

Johnstown, US

Current TAF Forecast

Raw TAF:
TAF KJST 041128Z 0412/0512 23007KT P6SM SCT150 FM041500 27008KT P6SM SCT050 PROB30 0421/0503 3SM TSRA BKN050CB FM050300 24005KT 6SM BR BKN100

Detailed TAF Table

Parameter
Sat
14:00Z
+-1h
Sat
15:00Z
+0h
Sat
16:00Z
+1h
Sat
17:00Z
+2h
Sat
18:00Z
+3h
Sat
19:00Z
+4h
Sat
20:00Z
+5h
Sat
21:00Z
+6h
Sat
22:00Z
+7h
Sat
23:00Z
+8h
Sun
00:00Z
+9h
Sun
01:00Z
+10h
Sun
02:00Z
+11h
Sun
03:00Z
+12h
Sun
04:00Z
+13h
Sun
05:00Z
+14h
Sun
06:00Z
+15h
Sun
07:00Z
+16h
Sun
08:00Z
+17h
Sun
09:00Z
+18h
Sun
10:00Z
+19h
Wind Dir
230°
SW
270°
W
270°
W
270°
W
270°
W
270°
W
270°
W
230°
SW
230°
SW
230°
SW
230°
SW
230°
SW
230°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
240°
SW
230°
SW
230°
SW
Wind Speed
7 kt
8 kt
8 kt
8 kt
8 kt
8 kt
8 kt
7 kt
7 kt
7 kt
7 kt
7 kt
7 kt
5 kt
5 kt
5 kt
5 kt
5 kt
5 kt
7 kt
7 kt
Visibility
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
3SM
3SM
3SM
3SM
3SM
3SM
6SM
6SM
6SM
6SM
6SM
6SM
>6SM
>6SM
Weather
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Thunderstorm Rain
TSRA
30%
Thunderstorm Rain
TSRA
30%
Thunderstorm Rain
TSRA
30%
Thunderstorm Rain
TSRA
30%
Thunderstorm Rain
TSRA
30%
Thunderstorm Rain
TSRA
30%
Mist
BR
Mist
BR
Mist
BR
Mist
BR
Mist
BR
Mist
BR
☀️ Clear
☀️ Clear
Clouds
SCT150
SCT050
SCT050
SCT050
SCT050
SCT050
SCT050
BKN050CB
BKN050CB
BKN050CB
BKN050CB
BKN050CB
BKN050CB
BKN100
BKN100
BKN100
BKN100
BKN100
BKN100
SCT150
SCT150
Ceiling
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
5,000 ft
AGL
5,000 ft
AGL
5,000 ft
AGL
5,000 ft
AGL
5,000 ft
AGL
5,000 ft
AGL
10,000 ft
AGL
10,000 ft
AGL
10,000 ft
AGL
10,000 ft
AGL
10,000 ft
AGL
10,000 ft
AGL
🌤️ Unlimited
🌤️ Unlimited
Flight Rules VFR VFR VFR VFR VFR VFR VFR MVFR MVFR MVFR MVFR MVFR MVFR VFR VFR VFR VFR VFR VFR VFR VFR
Day/Night
☀️
Day
☀️
Day
☀️
Day
☀️
Day
🌇 19:16Z
☀️
Day
🌇 19:16Z
☀️
Day
🌇 19:16Z
🌙
Night
🌇 19:16Z
🌙
Night
🌇 19:16Z
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌅 04:44Z
🌙
Night
🌅 04:44Z
🌙
Night
🌅 04:44Z
☀️
Day
🌅 04:44Z
☀️
Day
🌅 04:44Z
☀️
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
230° at 7 kt
Visibility
>6SM
Clouds
SCT150
📖 Plain English Explanation:

This is the base forecast condition. Winds from the Southwest (230°) at 7 kt. Visibility will be excellent at more than 6SM. Scattered clouds at 15000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

FM041500 15:00Z - 21:00Z
VFR
Wind
270° at 8 kt
Visibility
>6SM
Clouds
SCT050
📖 Plain English Explanation:

Winds from the West (270°) at 8 kt. Visibility will be excellent at more than 6SM. Scattered clouds at 5000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

PROB30 21:00Z - 03:00Z
MVFR
Visibility
3SM
Weather
Thunderstorm Rain
Clouds
BKN050CB
📖 Plain English Explanation:

There is a 30% probability of: Visibility will be good at 3SM. Weather conditions: Thunderstorm Rain. Broken clouds at 5000 feet. Marginal VFR conditions - some restrictions for visual flying.

FM050300 03:00Z - 09:00Z
VFR
Wind
240° at 5 kt
Visibility
6SM
Weather
Mist
Clouds
BKN100
📖 Plain English Explanation:

Winds from the West-Southwest (240°) at 5 kt. Visibility will be excellent at 6SM. Weather conditions: Mist. Broken clouds at 10000 feet. 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.