alabama’s coastal monsoon: variability in sea breeze thunderstorm rainfall
DESCRIPTION
Alabama’s Coastal Monsoon: Variability in Sea Breeze Thunderstorm Rainfall. Jason C. Senkbeil Department of Geography. Data Difficulties. Hourly Precipitation (NOAA). South Alabama Mesonet. Since 2008 for most stations. Complete records available for only 3 stations. BM. Atmore. - PowerPoint PPT PresentationTRANSCRIPT
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Alabama’s Coastal Monsoon: Variability in Sea Breeze Thunderstorm Rainfall
Jason C. SenkbeilDepartment of Geography
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Data Difficulties
Hourly Precipitation (NOAA)• Complete records available
for only 3 stations
South Alabama Mesonet• Since 2008 for most stations
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How do sea-breeze thunderstorms
form?
FH
MOB
AtmoreBM
RD
Coden
DI
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Sea Breeze Rainfall Belt?
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Station Total Days
Dry Days % Dry Mean Daily rainfall
Mean daily rainfall (excluding dry days)
Atmore 3908 2329 59.6 4.90 mm 10.87 mm
Bay Minette 5823 3426 58.8 5.72 mm 12.68 mm
Robertsdale 5850 3327 56.9 5.98 mm 12.75 mm
Fairhope 5875 3407 58.0 5.84 mm 12.57 mm
MOB 5872 3293 56.1 5.61 m 11.58 mm
Coden 4770 2993 62.7 5.61 mm 14.27 mm
Dauphin I 2 3483 2214 63.6 5.37 mm 13.12 mm
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df F p
6 2.46 .02
Station Pair p
FAIRHOPE and Atmore
.04
ROBERTSDALE and Atmore
<.01
df F p
6 5.46 <.01
Station Pair p
ROBERTSDALE and Atmore
.04
CODEN and Mobile
<.01
CODEN and Atmore
<.01
DI2 and Atmore
<.01
1 Way ANOVA all days
1 Way ANOVA precip days only
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4.5
5
5.5
6
6.5
7
50s 60s 70s 80s 90s 00s
Bay MinetteFairhopeMobileRobertsdale
Mean decadal daily precip (mm)
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Station r2
Atmore 0.48
Bay Minette 0.13
Robertsdale 0.46
Fairhope 0.31
MOB 0.10
Coden 0.49
Mean afternoon sst 2 – 6 pm and
cumulative seasonal precipitation
FH
MOB
Atmore
BM
RD
Coden
DI
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Wettest summers sea level pressure anomaly (mb)
Mobile Bay Minette
Fairhope Robertsdale
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Wettest summers geopotential height anomaly 500mb
Fairhope Robertsdale
Bay MinetteMobile
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1982, RD, BM, MOB
Sea level pressure
500 mb
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• Chaos Theory wins• Future research
– USA mesonet with Nexrad Level III Radar
• Sea Breeze belt appears to exist– Atmore, Coden, Dauphin Island different
• Decadal trends?• Correlation between sst and seasonal rainfall• Microscale disturbances
Conclusions