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Ouststorrn or sand 

 storm within sight of or 

 at station durmg past 



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29 



Thunderstorm (with 

 or without precipita- 

 tion) during past hour, 

 but NOT at time of 



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69 



Rain or drizzle and 

 heavy. 



Mf 



3 



89 



Slight shower(s) of 

 hail, with or without 



mixed, not associated 



99 



Heavy thunderstorm 

 with hail at time of 

 observation. 



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06 



Widespread dust in 

 suspension in the air. 

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SIMMS 



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forming or developing 

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State of sky on the 



whole unchanged dur- 

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Clouds generally dis 

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Cloiid development 

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100 



