Chase Log - 9 August 2004


Theme: Landspouts and supercell tornadoes
Target: Limon, CO
Chasers: Dan Lindsey, Matt Masarik, Chris Rozoff
Chase Vehicle: Lindsey's SUV

Brief Pre-event Meteorological Synopsis::

A well defined vorticity boundary existed across Colorado with strong instability axis working into CO. Also, a classic NWrly flow regime.

Results:

Click on photographs to get larger view:
Photo Credit: Dan Lindsey
Convective initiation near Agate, CO.
Convection is invigorating with landspout now seen developing under rain-free base, which is under the flanking line of a developing supercell.
Landspout continues to develop. Mesocyclone is developing to the right and starting to migrate over to the left, which will eventually end up on top of the tornado. This landspout lasts approximately 30 minutes, and the following images show more of its lifetime. This tornado gets a damage assessment of strong F1.
Continued evolution.
Continued evolution.
Interesting, as the tornado goes into its final dissapation, the funnel is now becoming located underneath a rapidly developing mesoscyclone.
Mesocyclone is now maturing, with heavy hail/rain FFD core to the right.
Rotating wall cloud developing.
Wall Cloud wrapping up in RFD precipitation.
RFD with heavy precipitation including baseball sized hail. Multiple vortex tornado is reportedly developing within the precipitation.
After observing, but not documenting this, a truncated cone starts to appear, and moments later, the occluding meso fully reveals a roped out tornado once we can glimpse around the heavy hail/rain core. The storm is quickly becoming outflow dominant at this point.
Heavy core to the left of a rope tornado.
Green storm!
A nice severe Colorado storm!
Sunset, looking toward COS.
And the sun set upon our storm.

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