4LL9 TAF
Terminal aerodrome forecast for Alan B. Janssen Airport (4LL9), Morrisonville, IL. This field does not issue a terminal forecast. · Open on the map
All of Alan B. Janssen Airport — runways, frequencies, charts and live weatherNo 4LL9 TAF
Only a minority of US airports issue a terminal aerodrome forecast, and Alan B. Janssen Airport is not one of them. The nearest forecasting stations are:
| Station | Airport | Distance |
|---|---|---|
| KSPI TAF | Abraham Lincoln Capital Airport | 32 NM on the 339° radial |
| KDEC TAF | Decatur Airport | 39 NM on the 041° radial |
| KBLV TAF | Scott AFB/Midamerica Airport | 52 NM on the 202° radial |
A TAF from a field this far away describes its own airport, not 4LL9. Read it as the regional trend and confirm with the nearest observation.
Frequently asked
What is the current TAF for 4LL9?
Alan B. Janssen Airport does not issue a terminal aerodrome forecast.
How far ahead does a TAF forecast?
A TAF covers a 24-hour period at most airports and 30 hours at larger ones, issued four times a day at 0000Z, 0600Z, 1200Z and 1800Z. It describes conditions within roughly 5 statute miles of the airport, not the surrounding area.
What do FM, BECMG and TEMPO mean?
FM (from) marks a rapid, permanent change at the stated time. BECMG (becoming) marks a gradual change over the stated window. TEMPO marks conditions expected for less than half the period, in spells of under an hour each. PROB30 and PROB40 give the probability of the conditions that follow.
More about 4LL9
Forecasts from the US National Weather Service Aviation Weather Center. Times are UTC (Zulu). For planning and education only — always confirm with an official preflight briefing.