From the following TAF you can assume that visibility at 2055Z in Birmingham (EGBB) will be:
EGBB 261000Z 2618/2712 28015G25KT 9999 SCT025 TEMPO 2618/2622 29018G35KT 4000 SHRASN BKN010CB PROB30 TEMPO 2618/2621 1500 TSGR BKN004CB BECMG 2622/2624 26010KT=
EGBB 261000Z 2618/2712 28015G25KT 9999 SCT025 TEMPO 2618/2622 29018G35KT 4000 SHRASN BKN010CB PROB30 TEMPO 2618/2621 1500 TSGR BKN004CB BECMG 2622/2624 26010KT=
2618/2712 9999
Period of validity, beginning on day 26 at 18 UTC/ ending on day 27 at 12 UTC
Visibility of 10 Km or more
TEMPO 2618/2622 4000
TEMPO: Temporary meteorological changes
2618/2622: Period of validity, beginning on day 26 at 18 UTC/ ending on day 26 at 22 UTC
4000: Visibility 4000 m
PROB30 TEMPO 2618/2621 1500
30% Probability
TEMPO: Temporary meteorological changes
2618/2621: Period of validity, beginning on day 26 at 18 UTC/ ending on day 26 at 21 UTC
1500: Visibility 1500 m
At 2055 UTC, we can expect visibility to be not less than 1500 m but could be in excess of 10 000 m.
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