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Expanded California Fire Weather Threats; Unsettled Across the West

A storm system will impact the western third of the U.S.. Strong, gusty winds will increase Fire Weather threats across much of western and central California. Rain and mountain snows can be expected across the Pacific Northwest and Northern Rockies, with wintry conditions in the Great Basin and High Plains. Accumulating snows will also continue across the Upper Midwest to the Northeast. Read More >

Clouds and rain chances will both increase through the day as a low pressure system approaches from the southwest . Some isolated thunderstorms will be possible across the southern portions of the region this afternoon. High temperatures will range from the lower 50s to around 60.
After quiet weather on Sunday, another disturbance will move across the region, bringing chances of rain and isolated thunderstorms back to North and Central Texas.
Maybe you've heard a rumor about wintry weather before Christmas? It's true, some of the forecast data does suggest a weather pattern favorable for winter weather. However, this potential event is so far out (beyond 7 days in fact), that a great deal of uncertainty exists, and as a result, we cannot definitively pin down what the weather pattern will look like. We know that arctic air is likely to surge through the region late Thursday and into Friday. We do NOT know whether precipitation will be able to develop in the cold airmass, as this will depend on the position of upper-level features which are being poorly modeled at this time. The two main scenarios are either for a mainly dry and cold forecast, or one with impacts from freezing rain, sleet, and snow across the region. Keep checking back for updates as the potential impacts from this next system become more certain.
Another cold front will move into the region this evening and overnight. This front will result in a north wind shift, but gusty winds are not expected until Thursday. Low temperatures tonight and Thursday morning will be in the 30s for most locations.

 
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December 29th, 2006 North Texas Tornado Outbreak 
Radar Images

Johnson County Dec 29th, 2006 Tornado Radar Images
These images show the KFWS reflectivity and storm relative mean
radial velocity data from southern Johnson County at 351 PM CST
on 12/29/06. The supercell thunderstorm that produced the tornado
is centered northeast of Rio Vista. A well defined hook is evident
in the reflectivity image on the east side of the supercell storm.


The storm relative velocity image shows an intense gate-to-gate
circulation feature (red next to green) within the reflectivity hook.
The storm was moving north at around 40 mph and was responsible for
a long-track tornado across western Hill County into central and
eastern Johnson County. 


Damage along parts of the path of this long-track tornado justified an F-2 rating, with maximum estimated winds of around 135 mph.



 Limestone county December 29th, 2006 Tornado Radar Pictures

 

 

 



These images show the KFWS reflectivity and storm relative mean radial velocity data from central Limestone County at 159 PM CST on 12/29/06. The supercell thunderstorm that produced the tornado is centered west of Groesbeck. 

The storm relative velocity image shows a well-defined circulation couplet (red next to green) just west of the town of Groesbeck in central Limestone County. 

The storm was moving north at over 40 mph and was responsible for
producing F-2 tornado damage in a swath across Limestone County.





Bosque County December 29th 2006 Tornado Radar Pictures






These images show the radar reflectivity and storm relative mean 
radial velocity data from Bosque County at 248 PM cST on 12/29/06.
The radar images are from the KFWS (Fort Worth - Spinks) WSR-88D
radar. The supercell thunderstorm that produced the tornado is 
shown just east of Clifton at this time. The storm relative velocity
image shows a well-defined circulation couplet (red next to green) 
southeast of Clifton in southern Bosque County. 

When the Doppler radar shows strong outbound velocities (red colors) 
very close to high inbound velocities (green) in the low levels of
the storm, that is evidence of strong low level rotation which could
be associated with a tornado on the ground. 

The storm was moving north at 40 mph and was responsible for F-2
tornado damage east of Clifton.