National Weather Service United States Department of Commerce

Heavy Rain, Flooding Possible From Remnants of Tropical Storm Cindy

The remnants of Tropical Storm Cindy will spread heavy rain into the Tennessee and Ohio Valleys today - and into the Appalachians and Mid-Atlantic tonight. Flash flooding is possible in these areas. Strong to severe thunderstorms are also possible in these areas. Flash flooding is life threatening. Never drive your car across flooded roadways. Read More >

It will be mostly sunny and hot today. A few thunderstorms will be possible late this afternoon along and north of a Graham to Sulphur Springs line. Highs will be in the 90s to 102 degrees. The combination of the heat and humidity will make it feel like 100 to 110 degrees!
A Heat Advisory is in effect from Noon through 7 PM today for much of North and Central Texas. The heat and humidity will combine to make it feell like it is 105 to 110 degrees. Take extra precautions if working or spending time outdoors. Take extra precautions if you work or spend time outside. When possible...reschedule strenuous activities to early morning or evening. Know the signs and symptoms of heat exhaustion and heat stroke. Wear light weight and loose fitting clothing when possible and drink plenty of water. Check on persons with health problems and the elderly as they are the most susceptible to heat exhaustion and heat stroke.
Thunderstorm chances will increase across the region this evening. There will be low chances along the Red River late afternoon and chances will spread south to the I-20 corridor during the early evening and down toward Central Texas late evening. In addition to cloud to ground lightning, a few storms may become severe, producing wind gusts to 60 mph and hail up to 1 inch in diameter. Heavy rain may result in some localized flooding.
There will be a threat for showers and thunderstorms tonight and tomorrow across North and Central TX. The greatest rain/storm potential will be in the overnight to late-morning hours. Rain chances will lower Saturday afternoon for areas north of I-20. Showers and storms are expected to move south afternoon and evening. Widespread severe weather is NOT expected, but gusty winds, lightning and brief heavy rain will be possible.
Waco may reach 100 degrees for the first time this year today. Here are some interesting 100 degree day information for Waco. * The average first 100 degree day is July 4th. * The average last 100 degree day is August 29th. * The earliest occurrence of 100 degrees was March 28th, back in 1971. * The latest occurrence of 100 degrees was October 4th, back in 1983. * We average 24 days with highs of 100 degrees or higher.
Good news! Thanks to a summer cold front that will sweep through North and Central Texas later tonight, a break from the summer heat is expected the next couple of days. Temperatures will be below seasonal normals. Forecast high temperatures will stay mostly in the 80s Saturday through Tuesday, then, warming up to the 90s by the end of next week.

 
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North Texas Winter Storm
December 5-7th, 2013

 

Total Snow and Sleet Accumulation MapA major winter storm gripped most of North and Central Texas from December 5th through the 10th, 2013, severely impacting travel and power throughout the region.  Freezing rain, sleet, and a little snow began falling during the afternoon of the 5th, and persisted through the morning hours of the 6th.  As dawn broke on December 6th, a thick layer of ice encased much of North and Central Texas.  Just about everyone north of a Goldthwaite to Hillsboro to Palestine line had ice on the ground at this point, including the entire DFW Metroplex.  Sleet and ice measured as deep as 5" in some areas, particularly in a swath extending from Denton, through Sherman, to Bonham.                

 

As challenging as these fresh accumulations were for residents and travelers, the prolonged cold would make things worse.  Temperatures dropped below freezing late in the day on the 5th, and would remain in the ice box for most of the next 5 days.  The recurring combination of tire compaction, melting/re-freezing, and sand treatment would transform the initial frozen precipitation into rock hard formations, which would eventually be referred to as “cobblestone ice”.  Most area streets and highways in the Metroplex and points north were subjected to these challenging conditions, forcing residents to remain at home for several days.  Further south, conditions were a bit better, though ice did linger on bridges, overpasses, and elevated surfaces.  Hundreds of cars and trucks were stranded for long periods on many of the main highways, particularly Interstate 35 from Fort Worth to the Oklahoma border, and Interstate 20 from Fort Worth going west.  

While travel disruption was a major impact from this winter storm, power and property were others.  Thousands of tree branches and power lines were downed by the weight of ice, particularly from Fort Worth, north and east to Paris.  At the peak of the storm, 275,000 customers were without power in the North Texas region.  Ice-laden tree branches crashed into vehicles, homes and other structures, sending thousands of residents scrambling for their insurance adjusters.  Early estimates from the Insurance Council of Texas topped $30 million in residential insured losses.  This figure did not include damage to vehicles or roads.  Many roads and bridges were directly damaged from the ice - or from attempts to remove the ice using plows and graders.  The clean-up from this event took weeks and even a few months in some places.

Ice covered tree in Paris, Tx Tree downed by ice across powerlines. Tree covered in ice in Paris, Tx

Pictures of from Paris, TX after the storm

Most schools, especially in the hardest hit areas, were closed for several days, and thousands of businesses were forced to close for at least a day or two.  Airlines at DFW Airport and Dallas Love Field cancelled hundreds of flights, and thousands of flyers were sheltered at both airports during the storm.  Seven fatalities occurred during this event; 4 in vehicles, 2 from exposure, and 1 from a fall on the ice.  Hundreds of injuries were also reported due to falls on the ice.

cobblestone ice picture
 Cobblestone Ice Photo by Fort Worth Star Telegram

Picture of icy conditions on I-35W at Sycamore School
Icy Conditions on I-35W Photo by TxDOT

Photo of accident clean up on I-35E Bridge in Lewisville
Accident clean-up on the I-35E Bridge in Lewisville 
Photo by The Dallas Morning News

   

A Little More About Cobblestone Ice.  Why Did It Form? 

One of the most memorable aspects of this particular storm was the introduction of “cobblestone ice” into the common vocabulary of North Texans.  So why did it form, and why did it get so bad? 

First off, it goes without saying that there was an abundance of precipitation with this event.  Many areas received over an inch of liquid, including DFW Airport, where 1.25” of liquid was observed.  North and east of the Metroplex, totals were even higher.  This translated into multiple inches of snow, sleet and/or freezing rain which existed in layers of varying depth.  As traffic and marginal air and ground temperatures began to work on this frozen mess, some of it melted partially and morphed into slush during the daytime hours.  Once nighttime fell, however, most of it would refreeze and harden.  Despite the best efforts of local and state road crews, this cycle of compaction, melting, refreezing and hardening repeated itself in some areas over a period of up to 4 days. 

In some spots, particularly on bridges and overpasses, larger chunks of ice were broken out of the icepack by plows and traffic.  These chunks would mix in with the slush during the daytime, forming a soupy gray mess.  At night, the entire concoction would refreeze, producing large molded bumps that were essentially glued to the very top of the roadways (or bridge decks).  It was these hard, rock-like formations that represented the essence of the cobblestone ice experience for North Texas drivers. 

Once frozen in place, this unique ice proved quite difficult to remove.  Depths ranged from ½” to 4”, depending on where traffic caused peaks and valleys in the slush before it froze into cobblestone form. 

While not a frequent occurrence, winter precipitation is no stranger to North and Central Texas.  Fortunately, the cobblestone ice phenomenon is quite unusual.  In addition to the magnitude of ice, it was the sustained period of cold temperatures following the event - interspersed with episodes of melting - that promoted the rough driving conditions.  The only sure way to prevent this from happening in the future will be to remove most of the sleet and snow from the roadways before it gets a chance to melt and refreeze.  Unfortunately, it may be difficult for local and state public works and transportation departments to achieve this lofty goal, given the thousands of miles of roadways under their jurisdictions.  Having said this, local cities and counties, the State of Texas, and the National Weather Service in Dallas/Fort Worth did learn a great deal from the December 6th, 2013 storm – and these lessons will surely benefit all of North and Central Texas during future events. 

   
 
 

 

Temperature Trend Graphic
Temperatures at DFW Airport. The bulk of the precipitation fell from 3 PM Thursday to 11 AM Friday.

 

 

   

Radar loop of ice and snow event
24 Hour Radar Loop

 

 

   
Satellite image that shows snow and ice across northwestern portions of North Texas.