Fantom X Posted July 16, 2011 Share Posted July 16, 2011 Check out this large dew point drop - from oppressively humid to torrid dryness in one hour at the end of the day when the wind switched from off of the water to the land http://www.wunderground.com/history/airport/OMDB/2011/7/16/DailyHistory.html Link to comment Share on other sites More sharing options...
hurricaneman Posted July 16, 2011 Share Posted July 16, 2011 an 85 degree drop in dewpoint, you dont see that everyday Link to comment Share on other sites More sharing options...
Diego Posted July 16, 2011 Share Posted July 16, 2011 It occurred at about 6pm local time, when a much drier land breeze from the east replaced a sea breeze coming from the Persian Gulf to its west. Ironically, although Dubai is on the eastern side of the Arabian Penisula, it's also on the western side of a penisula jutting out into the Persian Gulf with the Persian Gulf lying to the west and north of the city and the airport where its weather station is, and with the land based portion of this peninsula lying to it's east. It's interesting that with this substantial drop in RH at that time was also a 7 degree rise in temp. http://maps.google.com/maps?hl=en&biw=1259&bih=848&safe=active&um=1&ie=UTF-8&q=dubai+international+airport&fb=1&gl=us&hq=dubai+international+airport&hnear=dubai+international+airport&iwloc=lyrftr:transit,0x3e5f5da74c200393:0xa804f3095f87c7dc&ei=RuYhTrbvNcPLgQeNxdXBDQ&sa=X&oi=local_result&ct=transit-link&resnum=1&ved=0CDkQsQUwAA Link to comment Share on other sites More sharing options...
wall_cloud Posted July 16, 2011 Share Posted July 16, 2011 It occurred at about 6pm local time, when a much drier land breeze from the east replaced a sea breeze coming from the Persian Gulf to its west. Ironically, although Dubai is on the eastern side of the Arabian Penisula, it's also on the western side of a penisula jutting out into the Persian Gulf with the Persian Gulf lying to the west and north of the city and the airport where its weather station is, and with the land based portion of this peninsula lying to it's east. It's interesting that with this substantial drop in RH at that time was also a 7 degree rise in temp. http://maps.google.c...ved=0CDkQsQUwAA Sounds reasonable to me Diego. Drier air would heat up easier given the lack of water and thus lower heat capacity. Very impressive regardless. Its often warmer behind (on the dry side) of the dryline. Link to comment Share on other sites More sharing options...
Diego Posted July 16, 2011 Share Posted July 16, 2011 Sounds reasonable to me Diego. Drier air would heat up easier given the lack of water and thus lower heat capacity. Very impressive regardless. Its often warmer behind (on the dry side) of the dryline. I agree. My only question was why air of less density at that time of the day would replace air of slightly greater density (cooler with more humidity) that was overlying the airport and the city? My initial thinking was that this was simply a landbreeze replacing a seabreeze, but perhaps there's a synoptic explanation for it. Link to comment Share on other sites More sharing options...
Ellinwood Posted July 16, 2011 Share Posted July 16, 2011 an 85 degree drop in dewpoint, you dont see that everyday lolwut? It dropped 48F in two hours, and had a maximum change of 56F for the duration of the day. Where are you getting 85 from? Link to comment Share on other sites More sharing options...
Scotty Lightning Posted July 16, 2011 Share Posted July 16, 2011 lolwut? It dropped 48F in two hours, and had a maximum change of 56F for the duration of the day. Where are you getting 85 from? I'm sure it he meant to write "dewpoint depression of 85 degrees". Link to comment Share on other sites More sharing options...
Ellinwood Posted July 16, 2011 Share Posted July 16, 2011 I'm sure it he meant to write "dewpoint depression of 85 degrees". Largest dewpoint depression was 81F Link to comment Share on other sites More sharing options...
Scotty Lightning Posted July 16, 2011 Share Posted July 16, 2011 Largest dewpoint depression was 81F Hey, I didn't mention anything about his math not being correct. Link to comment Share on other sites More sharing options...
hurricaneman Posted July 16, 2011 Share Posted July 16, 2011 I'm sure it he meant to write "dewpoint depression of 85 degrees". Yes and I did mistype that, but now I get why the dewpoint depression is so large with a body of water on one side and desert on another Link to comment Share on other sites More sharing options...
Scotty Lightning Posted July 16, 2011 Share Posted July 16, 2011 Yes and I did mistype that, but now I get why the dewpoint depression is so large with a body of water on one side and desert on another A few weeks ago Las Vegas hit a record dewpoint depression of 129. Link to comment Share on other sites More sharing options...
phlwx Posted July 16, 2011 Share Posted July 16, 2011 lolwut? It dropped 48F in two hours, and had a maximum change of 56F for the duration of the day. Where are you getting 85 from? Actually it was one hour (6 to 7 PM) Link to comment Share on other sites More sharing options...
Ellinwood Posted July 17, 2011 Share Posted July 17, 2011 Actually it was one hour (6 to 7 PM) You're right... I was reading through the METAR and didn't realize they had stuck an extra ob in there between hours. Link to comment Share on other sites More sharing options...
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