John Murtha Johnstown Cambria County Airport

KJST / JST

Johnstown, US

Current TAF Forecast

Raw TAF:
TAF KJST 280147Z 2802/2824 VRB04KT P6SM BKN040 FM281100 27005KT 6SM -SHRA BKN007 OVC015 PROB30 2811/2817 3SM TSRA OVC015CB FM281700 31008KT P6SM -SHRA BKN025 OVC040 PROB30 2817/2822 4SM -TSRA OVC025CB

Detailed TAF Table

Parameter
Tue
02:00Z
+-1h
Tue
03:00Z
+0h
Tue
04:00Z
+1h
Tue
05:00Z
+2h
Tue
06:00Z
+3h
Tue
07:00Z
+4h
Tue
08:00Z
+5h
Tue
09:00Z
+6h
Tue
10:00Z
+7h
Tue
11:00Z
+8h
Tue
12:00Z
+9h
Tue
13:00Z
+10h
Tue
14:00Z
+11h
Tue
15:00Z
+12h
Tue
16:00Z
+13h
Tue
17:00Z
+14h
Tue
18:00Z
+15h
Tue
19:00Z
+16h
Tue
20:00Z
+17h
Tue
21:00Z
+18h
Tue
22:00Z
+19h
Wind Dir
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
VRB
310°
NW
Wind Speed
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
4 kt
8 kt
Visibility
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
>6SM
3SM
3SM
3SM
3SM
3SM
3SM
4SM
4SM
4SM
4SM
4SM
>6SM
Weather
☀️ Clear
☀️ Clear
☀️ 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%
Light Thunderstorm Rain
-TSRA
30%
Light Thunderstorm Rain
-TSRA
30%
Light Thunderstorm Rain
-TSRA
30%
Light Thunderstorm Rain
-TSRA
30%
Light Thunderstorm Rain
-TSRA
30%
Light Showers Rain
-SHRA
Clouds
BKN040
BKN040
BKN040
BKN040
BKN040
BKN040
BKN040
BKN040
BKN040
OVC015CB
OVC015CB
OVC015CB
OVC015CB
OVC015CB
OVC015CB
OVC025CB
OVC025CB
OVC025CB
OVC025CB
OVC025CB
BKN025
OVC040
Ceiling
4,000 ft
AGL
4,000 ft
AGL
4,000 ft
AGL
4,000 ft
AGL
4,000 ft
AGL
4,000 ft
AGL
4,000 ft
AGL
4,000 ft
AGL
4,000 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
1,500 ft
AGL
2,500 ft
AGL
2,500 ft
AGL
2,500 ft
AGL
2,500 ft
AGL
2,500 ft
AGL
2,500 ft
AGL
Flight Rules VFR VFR VFR VFR VFR VFR VFR VFR VFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR MVFR
Day/Night
🌙
Night
🌅 04:56Z
🌙
Night
🌅 04:56Z
🌙
Night
🌅 04:56Z
☀️
Day
🌅 04:56Z
☀️
Day
🌅 04:56Z
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
🌇 19:03Z
☀️
Day
🌇 19:03Z
☀️
Day
🌇 19:03Z
🌙
Night
🌇 19:03Z
🌙
Night
🌇 19:03Z
🌙
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 4 kt
Visibility
>6SM
Clouds
BKN040
📖 Plain English Explanation:

This is the base forecast condition. Winds will be variable in direction at 4 kt. Visibility will be excellent at more than 6SM. Broken clouds at 4000 feet. Conditions will be suitable for Visual Flight Rules (VFR) operations.

FM281100 11:00Z - 17:00Z
IFR
Wind
270° at 5 kt
Visibility
6SM
Weather
Light Showers Rain
Clouds
BKN007 OVC015
📖 Plain English Explanation:

Winds from the West (270°) at 5 kt. Visibility will be excellent at 6SM. Weather conditions: Light Showers Rain. Broken clouds at 700 feet, Overcast skies at 1500 feet. Instrument Flight Rules (IFR) conditions - instrument flying required.

PROB30 11:00Z - 17:00Z
MVFR
Visibility
3SM
Weather
Thunderstorm Rain
Clouds
OVC015CB
📖 Plain English Explanation:

There is a 30% probability of: Visibility will be good at 3SM. Weather conditions: Thunderstorm Rain. Overcast skies at 1500 feet. Marginal VFR conditions - some restrictions for visual flying.

FM281700 17:00Z - 23:00Z
MVFR
Wind
310° at 8 kt
Visibility
>6SM
Weather
Light Showers Rain
Clouds
BKN025 OVC040
📖 Plain English Explanation:

Winds from the Northwest (310°) at 8 kt. Visibility will be excellent at more than 6SM. Weather conditions: Light Showers Rain. Broken clouds at 2500 feet, Overcast skies at 4000 feet. Marginal VFR conditions - some restrictions for visual flying.

PROB30 17:00Z - 22:00Z
MVFR
Visibility
4SM
Weather
Light Thunderstorm Rain
Clouds
OVC025CB
📖 Plain English Explanation:

There is a 30% probability of: Visibility will be good at 4SM. Weather conditions: Light Thunderstorm Rain. Overcast skies 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.