Answer to Forecast Question

Here are the actual observations from Savannah from Sept. 17-18:

CITY DAY/TIME WIND VISIB SKY TEMP/DEWP

KSAV 172053Z 26009KT 10SM CLR 33/21

KSAV 172153Z 25007KT 10SM FEW060 32/21

KSAV 172253Z 26005KT 10SM FEW070

KSAV 172353Z 21004KT 10SM CLR 28/24

KSAV 180053Z 20004KT 9SM CLR 27/24

KSAV 180153Z 25004KT 8SM CLR 26/24

KSAV 180253Z 21003KT 7SM SCT060 25/24

KSAV 180353Z 23005KT 7SM BKN060 BKN070 25/24

KSAV 180453Z 26005KT 7SM BKN055 BKN070 25/23

KSAV 180553Z 30004KT 9SM FEW050 SCT080 24/22

KSAV 180653Z 34005KT 10SM CLR 23/19

KSAV 180753Z 36007KT 10SM CLR 22/19

KSAV 180853Z 01005KT 10SM CLR 21/18

KSAV 180953Z 36004KT 10SM CLR 20/17

KSAV 181053Z 36004KT 10SM CLR 19/17

KSAV 181153Z 36006KT 10SM CLR 19/17

KSAV 181253Z 01006KT 10SM BKN060 21/17

KSAV 181353Z 03009KT 10SM FEW060 23/15

KSAV 181453Z 03010KT 10SM CLR 24/14

KSAV 181553Z 03009KT 10SM CLR 26/14

KSAV 181653Z 00000KT 10SM CLR 26/14

KSAV 181753Z VRB04KT 10SM CLR 27/15

As you can see, once the wind shifted to the northwest and north, around 06Z, the dewpoint dropped to around 18 C. The temperature, which had been hovering around the mid 20s, was free to drop as well, and reached 19 by dawn. As on previous nights, no dew or fog formed. On this day, the best forecast was b).

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