Warm and humid Wednesday

September 20th:  Summer-like temperature and humidity occurred across the local region this Wednesday, as high dew points pooled along a frontal zone over the area.  While there was quite a bit of cloudiness associated with the stalling front over our area, no showers or storms could develop as the instability (cool air aloft) and dynamics (jet stream lift) was west and north of the area.   The high and low temperature at the Lawrence Airport was 89 and 73 with a dew point ranging from a low of 70 in the morning to a high of 78 in the evening.  That is competitively warm and humid with a July day.

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A dissipating frontal band brought clouds to eastern Kansas Wednesday with a few storms as far south as Iowa.  A strong upper trough of low pressure was digging down the west coast, bringing cool rain and mountain snow to parts of northern California, Oregon and Washington.  Semi-permanent TS Jose continued to meander southeast of Cape Cod.

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The 250 MB chart Wednesday evening shows the upper trough digging southward off the west coast and driving a frontal band with some precipitation as far south as northern California.  A very strong jet stream flow extends from northern California to northern Minnesota.  Eastern Kansas is now stuck firmly in a ridge of high pressure aloft, allowing very warm air to move over the area.

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The sunrise out at the Baker Wetlands Wednesday morning.

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A patch of low clouds partially eclipses the rising sun.

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However, the sun ultimately emerges victorious.

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Herons hunt for breakfast.

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Sunset at Clinton Lake Wednesday.  Clouds associated with stationary front over the area pretty well blocked the sun as seen from the lake at sunset.  There were some great crepuscular rays through a break on the way out, but once there, the clouds ruled.

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It looked like it could shower or rain, but the air was far too stable above the low cloud deck in the upper ridge position we were situated in, despite the frontal zone stalled over us and the high humidity levels.  At this time it was very humid with a dew point of 78 registering at my residence.  Just moving the camera into the car caused me profuse sweating.  Thank goodness for the good AC once we got going!

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The clouds were moving at a good clip but at the surface winds were very light.  There were only some ripples from distant boats on the surface of the lake.

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Breaking up was hard to do.

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Except right overhead and off to our east.

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Turkey buzzards and gulls on their usual evening perches out in the distance on the lake.

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A webcam view at another lake – Mono Lake in eastern California, looking eastward not long before sunset.  A strong west wind aloft ahead of an active frontal band over northern California is generating lee wave clouds east of the sierra at sunset.

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The light across the lake changes from minute to minute in these conditions.   It is a spectacular sight.

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The clouds and the lake both glow just before sunset.  This web cam is situated on the roof of the Mono Lake Visitor Center near Lee Vining, California.

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Late day satellite image shows the lee-wave clouds extending from the Reno area southward to over the Mono Lake area east of the Sierra (arrow).  Meanwhile, in the high Sierra proper, the first precipitation of the fall season is occurring.   Some lee-wave cloud action is also seen just east of the San Francisco Bay area, but is not as prominent as beyond the major wind barrier that is the Sierra Nevada Range.  The digging upper trough is keeping the front going as it moves southward across California.  Although rainfall amounts at lower elevations are very light, the Sierra Range is picking up decent rain and snow for this time of year.  This should pretty much douse out the remaining wildfires in the Sierra, I would think.

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