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April 22, 2001 Dust Episode. Just after the Asian dust episode. 20% worst for three sites in West Texas and Mid South Region Worst day for Bext at GUMO 20% best day for several sites in UT, CO, NM and AZ. WIMO. SACR. GUMO. Synoptic Conditions. - PowerPoint PPT Presentation
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April 22, 2001 Dust Episode
20% worst for three sites in West Texas and Mid South Region
Worst day for Bext at GUMO
20% best day for several sites in UT, CO, NM and AZ
GUMO
SACR
WIMO
Just after the Asian dust episode
Synoptic ConditionsNWS: “Intense upper low and associated surface cyclone pulling away from the area the evening of April 22nd in this map. Expect winds to decouple fairly quickly this evening across all but the ECNTL/NE where a wind advisory will be in effect until 03Z.”
Surface Conditions: AM
Dryline
coldfront
Surface Conditions: PM
coldfront
Surface Conditions: El Paso
The El Paso airport reported blowing dust afternoon and evening of April 21st. Winds gusting between 24 and 36 knots on April 22nd.
Low dewpoints-dry air
Surface Conditions: El PasoNEXRAD reports no rain at the West Texas sites by the morning of April 22nd.
Flagstaff, Farmington and Front Range stations report light snow in the morning. Forecasted snow at Northern NM upper elevations.
Probably snow
5 day West Texas backtrajectoriesImply Southern NM and West Texas “local” sources and potential transport from Northern Mexico
12z 12z
Large regional dust sourcesThere are more sources to the east in NM and west Texas not shown on this map
GICL
GUMO
SACR
5 day Oklahoma backtrajectories
12z 18z
23z 03z
Site in Moist Gulf air east of dryline Dryline moving eastward
Dryline at lower levels only: red is 10m trajectory, warm dry air is aloft to transport air from the west
Causes of haze during the event
DustSource
CM transported from West Texas wind aloft; Sulfates at WIMO from Ohio Valley and sea salt; organics may be from Ohio Valley and low level transport from central Texas
CM and FS at GUMP and SACR from sources in NM, TX and Mexico
WIMO