John Murtha Johnstown Cambria County Airport

KJST / JST

Johnstown, US

Current TAF Forecast

Raw TAF:
TAF KJST 142339Z 1500/1524 30012G19KT 4SM -SHRA BR OVC007 FM150400 31012G18KT P6SM -SHRA OVC005 FM151400 31012G20KT P6SM BKN025 FM151700 30010KT P6SM SCT035

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
300°
NW
300°
NW
300°
NW
310°
NW
310°
NW
310°
NW
310°
NW
310°
NW
310°
NW
300°
NW
300°
NW
300°
NW
300°
NW
310°
NW
310°
NW
310°
NW
300°
NW
300°
NW
300°
NW
300°
NW
300°
NW
300°
NW
Wind Speed
12 kt
G19 kt
12 kt
G19 kt
12 kt
G19 kt
12 kt
G18 kt
12 kt
G18 kt
12 kt
G18 kt
12 kt
G18 kt
12 kt
G18 kt
12 kt
G18 kt
12 kt
G19 kt
12 kt
G19 kt
12 kt
G19 kt
12 kt
G19 kt
12 kt
G20 kt
12 kt
G20 kt
12 kt
G20 kt
10 kt
G19 kt
10 kt
G19 kt
10 kt
G19 kt
10 kt
G19 kt
10 kt
G19 kt
10 kt
G19 kt
Visibility
4SM
4SM
4SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
4SM
4SM
4SM
4SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
Weather
Light Showers Rain, Mist
-SHRA BR
Light Showers Rain, Mist
-SHRA BR
Light Showers Rain, Mist
-SHRA BR
Light Showers Rain
-SHRA
Light Showers Rain
-SHRA
Light Showers Rain
-SHRA
Light Showers Rain
-SHRA
Light Showers Rain
-SHRA
Light Showers Rain
-SHRA
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
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
☀️ Clear
Clouds
OVC007
OVC007
OVC007
OVC005
OVC005
OVC005
OVC005
OVC005
OVC005
OVC007
OVC007
OVC007
OVC007
BKN025
BKN025
BKN025
SCT035
SCT035
SCT035
SCT035
SCT035
SCT035
Ceiling
700 ft
AGL
700 ft
AGL
700 ft
AGL
500 ft
AGL
500 ft
AGL
500 ft
AGL
500 ft
AGL
500 ft
AGL
500 ft
AGL
700 ft
AGL
700 ft
AGL
700 ft
AGL
700 ft
AGL
2,500 ft
AGL
2,500 ft
AGL
2,500 ft
AGL
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
🌤️ Unlimited
Flight Rules IFR IFR IFR IFR IFR IFR IFR IFR IFR IFR IFR IFR IFR MVFR MVFR MVFR VFR VFR VFR VFR VFR VFR
Day/Night
🌙
Night
🌙
Night
🌅 04:58Z
🌙
Night
🌅 04:58Z
🌙
Night
🌅 04:58Z
☀️
Day
🌅 04:58Z
☀️
Day
🌅 04:58Z
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
🌇 19:01Z
☀️
Day
🌇 19:01Z
☀️
Day
🌇 19:01Z
🌙
Night
🌇 19:01Z
🌙
Night
🌇 19:01Z
🌙
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
IFR
Wind
300° at 12 kt
Gusts: 19 kt
Visibility
4SM
Weather
Light Showers Rain, Mist
Clouds
OVC007
📖 Plain English Explanation:

This is the base forecast condition. Winds from the West-Northwest (300°) at 12 kt. Gusts up to 19 kt are expected. Visibility will be good at 4SM. Weather conditions: Light Showers Rain, Mist. Overcast skies at 700 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

FM150400 04:00Z - 10:00Z
IFR
Wind
310° at 12 kt
Gusts: 18 kt
Visibility
>6SM
Weather
Light Showers Rain
Clouds
OVC005
📖 Plain English Explanation:

Winds from the Northwest (310°) at 12 kt. Gusts up to 18 kt are expected. Visibility will be excellent at more than 6SM. Weather conditions: Light Showers Rain. Overcast skies at 500 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

FM151400 14:00Z - 20:00Z
MVFR
Wind
310° at 12 kt
Gusts: 20 kt
Visibility
>6SM
Clouds
BKN025
📖 Plain English Explanation:

Winds from the Northwest (310°) at 12 kt. Gusts up to 20 kt are expected. Visibility will be excellent at more than 6SM. Broken clouds at 2500 feet. Marginal VFR conditions - some restrictions for visual flying.

FM151700 17:00Z - 23:00Z
VFR
Wind
300° at 10 kt
Visibility
>6SM
Clouds
SCT035
📖 Plain English Explanation:

Winds from the West-Northwest (300°) at 10 kt. Visibility will be excellent at more than 6SM. Scattered clouds at 3500 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.