National Weather Service United States Department of Commerce

Showers & embedded storms moving NE through the region. We are watching for additional development just to our west over the next two hours or so. The severe threat will increase as this additional activity begins to march eastward into the region after about 8 AM.
A Dense Fog Advisory is in effect until 9 AM for the counties shaded in gray. Visibilities of under 1/4 mile at times are expected, and this will lead to hazardous driving conditions. Slow down, and use your low-beam headlights if you encounter areas of dense fog this morning.
Strong to severe thunderstorms will be possible this morning . The initial threat will be from large hail, but as the storms move east and encounters better moisture, instability and wind shear, the threat for damaging winds and even a few tornadoes will increase. Some heavy rainfall and flooding will also be possible.
A Flood Watch is in effect through noon today in the light green shaded counties and through 4 PM in the dark green shaded counties. Additional rainfall accumulations of one to two inches (locally higher) can be expected. Soils are saturated across North Texas, and any additional rainfall will result in rapid runoff, likely leading to flooding.
Join us to our next SKYWARN Class on Saturday February 24th from 9 AM through 4 PM in Denton, TX. . We will host both Basic and Advanced classes at the Texas Woman's University (Margo Jones Performance Hall). Classes are FREE and there is no registration needed. We will see you there!

 
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North Texas Severe Weather April 23, 2008
Erath-Palo Pinto and Tarrant-Johnson Counties

During the late afternoon hours on Wednesday, April 23, 2008, supercell thunderstorms spread from west Texas into parts of north Texas. Additional thunderstorms developed through the evening hours as the complex of thunderstorms moved east. Reports of tornadoes, very large hail, damaging straight-line winds, and flash flooding accompanied the thunderstorms.  (Read the Local Storm Report Summary)

The WSR-88D radar images below show a supercell thunderstorm near the Erath - Palo Pinto County line at 647 pm CDT. The bright red and pink colors in the radar reflectivity represent values up to 70 dBZ that were caused by very large hailstones. Also note the distinct hook echo on the southern part of the storm straight west of Lipan. The Doppler Velocity image, also taken at 647 pm CDT, shows a large, well-defined counterclockwise circulation pattern across extreme northern Erath County. The red colors in the storm-relative mean radial velocity image indicate winds blowing AWAY from the radar located at KFWS (Fort Worth Spinks airport); the green colors represent winds blowing toward the radar (or from west to east). This supercell thunderstorm prompted the issuance of Tornado Warnings across this area Wednesday evening. This statement gives a brief summary of the known tornadoes that occurred in this area.

KFWS Reflectivity Image at 6:47 pm CDT - April 23, 2008

KFWS Storm Relative Velocity  Image at 6:47 pm CDT - April 23, 2008

KFWS Reflectivity Image at 6:47 pm CDT - April 23, 2008

KFWS Storm Relative Velocity  Image at 6:47 pm CDT - April 23, 2008

 

These two WSR-88D images were taken at a radar elevation angle of 1.5 degrees at 832 pm CDT on 4/23/08. Intense thunderstorms were moving
across Johnson and southwest Tarrant County. The pattern in the red colors (50+ dBZ) resembles an arc shape or "bow", indicating that very strong low level winds were associated with the line of storms across this area. The mean radial velocity image shows a distinct transition area where outbound (relative to the KFWS radar site which is between Crowley and Rendon) velocities are located next to inbound velocities along a radar radial. This transition zone, which represents a region of intense horizontal wind shear, is best defined on the velocity image from the southwest tip of Tarrant County eastward to between Joshua and Burleson. This thunderstorm moved northeast into Tarrant County and was responsible for producing a tornado near Crowley. The results of the damage survey are available.

KFWS Reflectivity Image at 8:32 pm CDT - April 23, 2008 (1.5 degrees)

KFWS Storm Relative Velocity Image at 8:32 pm CDT - April 23, 2008

KFWS Reflectivity Image at 8:32 pm CDT - April 23, 2008 (1.5 degrees)

KFWS Storm Relative Velocity Image at 8:32 pm CDT - April 23, 2008