John Murtha Johnstown Cambria County Airport

KJST / JST

Johnstown, US

Current TAF Forecast

Raw TAF:
TAF KJST 041941Z 0420/0518 VRB04KT 1/4SM FG VV002 FM042200 14004KT 1 1/2SM BR OVC003 PROB30 0503/0507 2SM -RA OVC003 FM050700 18004KT 1 1/2SM -RA BR OVC003 FM050900 21007KT 1/4SM -RA FG OVC003

Detailed TAF Table

Parameter
Wed
20:00Z
+-1h
Wed
21:00Z
+0h
Wed
22:00Z
+1h
Wed
23:00Z
+2h
Thu
00:00Z
+3h
Thu
01:00Z
+4h
Thu
02:00Z
+5h
Thu
03:00Z
+6h
Thu
04:00Z
+7h
Thu
05:00Z
+8h
Thu
06:00Z
+9h
Thu
07:00Z
+10h
Thu
08:00Z
+11h
Thu
09:00Z
+12h
Thu
10:00Z
+13h
Thu
11:00Z
+14h
Thu
12:00Z
+15h
Thu
13:00Z
+16h
Thu
14:00Z
+17h
Thu
15:00Z
+18h
Thu
16:00Z
+19h
Wind Dir
VRB
VRB
140°
SE
140°
SE
140°
SE
140°
SE
140°
SE
VRB
VRB
VRB
VRB
180°
S
180°
S
210°
SW
210°
SW
210°
SW
210°
SW
210°
SW
210°
SW
VRB
VRB
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
7 kt
7 kt
7 kt
7 kt
7 kt
7 kt
4 kt
4 kt
Visibility
1/4SM
1/4SM
1/2SM
1/2SM
1/2SM
1/2SM
1/2SM
2SM
2SM
2SM
2SM
1/2SM
1/2SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
1/4SM
Weather
Fog
FG
Fog
FG
Mist
BR
Mist
BR
Mist
BR
Mist
BR
Mist
BR
Light Rain
-RA
30%
Light Rain
-RA
30%
Light Rain
-RA
30%
Light Rain
-RA
30%
Light Rain, Mist
-RA BR
Light Rain, Mist
-RA BR
Light Rain, Fog
-RA FG
Light Rain, Fog
-RA FG
Light Rain, Fog
-RA FG
Light Rain, Fog
-RA FG
Light Rain, Fog
-RA FG
Light Rain, Fog
-RA FG
Fog
FG
Fog
FG
Clouds
VV002
VV002
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
OVC003
VV002
VV002
Ceiling
200 ft 🌫️
Indefinite
200 ft 🌫️
Indefinite
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
300 ft
AGL
200 ft 🌫️
Indefinite
200 ft 🌫️
Indefinite
Flight Rules LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR LIFR
Day/Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌙
Night
🌅 06:23Z
🌙
Night
🌅 06:23Z
🌅
Dawn
🌅 06:23Z
☀️
Day
🌅 06:23Z
☀️
Day
🌅 06:23Z
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
☀️
Day
🌇 17:36Z
☀️
Day
🌇 17:36Z
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 occurrence • AGL: Above Ground Level

Forecast Periods

BASE
LIFR
Wind
VRB° at 4 kt
Visibility
1/4SM
Weather
Fog
Clouds
VV002
📖 Plain English Explanation:

This is the base forecast condition. Winds will be variable in direction at 4 kt. Visibility will be moderate at 1/4SM. Weather conditions: Fog. Vertical visibility at 200 feet. Low IFR conditions - challenging even for instrument operations.

FM042200 22:00Z - 04:00Z
LIFR
Wind
140° at 4 kt
Visibility
1/2SM
Weather
Mist
Clouds
OVC003
📖 Plain English Explanation:

Winds from the Southeast (140°) at 4 kt. Visibility will be moderate at 1/2SM. Weather conditions: Mist. Overcast skies at 300 feet. Low IFR conditions - challenging even for instrument operations.

PROB30 03:00Z - 07:00Z
LIFR
Visibility
2SM
Weather
Light Rain
Clouds
OVC003
📖 Plain English Explanation:

There is a 30% probability of: Visibility will be moderate at 2SM. Weather conditions: Light Rain. Overcast skies at 300 feet. Low IFR conditions - challenging even for instrument operations.

FM050700 07:00Z - 13:00Z
LIFR
Wind
180° at 4 kt
Visibility
1/2SM
Weather
Light Rain, Mist
Clouds
OVC003
📖 Plain English Explanation:

Winds from the South (180°) at 4 kt. Visibility will be moderate at 1/2SM. Weather conditions: Light Rain, Mist. Overcast skies at 300 feet. Low IFR conditions - challenging even for instrument operations.

FM050900 09:00Z - 15:00Z
LIFR
Wind
210° at 7 kt
Visibility
1/4SM
Weather
Light Rain, Fog
Clouds
OVC003
📖 Plain English Explanation:

Winds from the South-Southwest (210°) at 7 kt. Visibility will be moderate at 1/4SM. Weather conditions: Light Rain, Fog. Overcast skies at 300 feet. Low IFR conditions - challenging even for instrument 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.