Weather Forecasts and Outlooks

Central Texas Weather Outlook for 05-16-2012 through 05-23-2012
[Updated at 8:00am 05-16-2012]

When this page is not being updated, here is a good alternative:  Central Texas Zoom Radar

Tropical Storm Aletta has developed well off the southwest coast of Mexico. The storm is moving west (away from land). See my updated Tropical Weather Page for details.

This Week's Lake Levels
[updated weekly on Monday unless heavy rains occur during the week]

Forecast Discussion:

Morning surface analysis found a large area of mainly weak high pressure from southern Canada all the way to the Gulf of Mexico. Embedded in the high pressure area is a weak cold front that stretches from the eastern Great Lakes to near St. Louis, MO to the OK-KS border then west to the Front Range of the Rockies near Denver, the north-northwest along the High Plains-Rocky Mountain interface. Weak low pressure areas are found over the U.S. east coast and just inland from the U.S. west coast.

Morning upper air anaysis found the cut-off mid-tropospheric vortex that moved across Texas the past two days to still be over southeastern Texas near Houston. This circulation and attendant impact on ascent in the lower and middle troposphere may again today provide an impetus for scattered thunderstorms activity during the afternoon hours, but mainly confined to southeastern Texas and the immediate coastal areas and near-shore waters southwest down the Texas coast to Brownsville.

Morning upper air soundings from stations in/near Central Texas show a significant decrease in precipitable water (PW) at all stations except those near the Texas and Louisiana coastal areas.


Latest Surface Analysis from HPC


HPC 5-Day (120-hour) QPF graphic valid 7am CDT Today through 7am CDT Monday





Graphic posted today on NWSFO Fort Worth homepage

The graphic above was posted today on the homepage of the NWS Forecast Office in Fort Worth. It purports to show that "dry conditions are returning" to North Texas. The apparent thrust of this message was to create public concern that the drought is rearing its head again. Before I go any further, let me say that I have much admiration for the Fort Worth NWS office, and I don't want what I say here to be some sort of general criticism of the men and women who work there. But ... I have to tell you that whoever decided to "wag the dog" in this manner is ignoring reality! Grabbing the last 30 days as some signal that dry conditions are returning is myopic. Let me show why I say that.

I'll start with rainfall records for my backyard CoCoRahs measuring site located 4.7 miles west of downtown Temple: For the period January 1st through today, I have measured 20.5 inches of rain. That breaks out as follows: January=3.36"; February=3.94"; March=8.19"; April=2.61"; so far in May=2.40".

After pulling those numbers from my daily submissions to CoCoRahs, I thought, well, maybe it has just been wetter here than elsewhere. So, from the NWSFO Fort Worth website, I obtained the Waco airport rainfall records. Waco's records look like this: January=4.24"; February=2.80"; March=8.33"; April=1.66"; May through the 14th=1.48"; total since January 1st=18.51". To put that in perspective, the normal for Waco through May 14th is 12.51", so Waco is 6 inches above normal since January 1st.

After pulling those numbers for Waco airport, I thought, well, maybe it has just been wetter at Waco than at the DFW airport. So, from the NWSFO Fort Worth website, I obtained the DFW airport rainfall records. DFW's records look like this: January=6.18; February=1.88"; March=5.74"; April=4.24"; May through the 14th=0.80"; total since January 1st=18.84".

So, my backyard compares closely to the Waco airport which compares closely to the DFW airport when one considers the year-to-date rainfall at all three locations. I came away from this little exercise thinking ... "Heck, there are probably a lot of folks who didn't object to the 30-day (relative) dry spell after all the rain we had in January through March!"  And it doesn't stop there ... since September 15th, I have recorded almost 30 inches of rain here on the western side of Temple!

I will admit that the computer models are showing a relatively dry trend for the next ten days to two weeks for this part of Texas. I will add that several times since January 1st, what was shown as a dry spell by the extended range models ended up being on the wet side. Will that trend continue? Don't know!


NWS NEXRAD RADAR FOR CENTRAL TEXAS

Latest image from the NWS/DOD Central Texas nexrad.

24-frame LOOP of GRK radar.
[The time stamps on the image are in Coordinated Universal Time (UTC). To convert to CST, subtract 6 hours. For example, 1800UTC is 1200CST (i.e. 12 noon).]
[Image provided by and used with permission of Paul Sirvatka, Next Generation Weather Lab, College of DuPage]



Latest composite nexrad image for Texas and nearby states
LOOP this radar view.***Not currently available***
[Image provided by and used with permission of Paul Sirvatka, Next Generation Weather Lab, College of DuPage]


Close-up Visible Satellite View of Central Texas


Close-up visible satellite view of our part of Texas.  Since it is a visible image, it requires sunlight, so this product will only show clouds during daylight hours. This product is generated by my friend Gilbert Sebenste at Northern Illinois University, and is used with his permission.


Central Texas Tornado History

May 12-19:

On May 12, 2000 ...
NCDC:A tornado formed over the central part of Lake Whitney at approximately 1610 CST. The tornado moved south and dissipated near the dam at 1625 CST. The tornado caused two deaths, both of which occurred in the same home, but no other injuries. The most significant damaged occurred at the Lakewood Harbor Subdivision, three miles northwest of the Dam, around 1615 CST. 38 homes were destroyed and 27 others were damaged. M70PH, F80PH May 12, 2000 - Event Narrative: A cold front moved into North Texas, and became stationary along a Bonham, Dallas, Hillsboro, Goldthwaite line. Numerous hail and wind reports were received. An F-3 tornado touched down near Lake Whitney in the late afternoon hours.The parent storm continued to develop on the south flank, resulting in a long lived wall cloud that moved south through southern Bosque, western McLennan, eastern Coryell, and western Bell counties. While reports of hail and funnels continued through the life of the storm, no additional tornadoes were sighted. }

On May 12, 1982,  a tornado developed in Parker County ten miles south of Weatherford. The tornado moved east-northeast to ten miles east-southeast of Weatherford. It struck a mobile home park and destroyed five mobile homes and damaged twelve others. Damage was rated F2. A number of barns were damaged. The maximum path width was 150 yards and the path length was eight miles. There were six injuries but no deaths.

On May 13, 1994, a tornado developed near Marble Falls in Burnet County. Damage was rated F3, with three injuries but no deaths.

NCDC:The storm approached the city from the west-southwest. There were unconfirmed reports of funnels in the Horseshoe Bay area, four miles southwest of Marble Falls, before the storm arrived. Spotty damage was reported to roofs in the Horseshoe Bay area. The tornado first struck the west side of the city, crossing a heavy commercialized and residential area. Roofs were severely damaged at this time with several structures sustaining F1 and F2 damage. Several boats at a dealership were tossed on top of each other. Two-by-four's were embedded into the side of a church preschool care center, penetrating an inside classroom wall by four to five feet. Fortunately, all children had been moved into hallways just before the tornado arrived. Numerous commerical signs were down with widespread roof damage. This damage became even more extensive as the tornado moved across the northern part of the city. Marble Falls primary school also sustained damage, but students had been evacuated to the main school. Trees were uprooted on the school grounds and damage was reported to outbuildings. Metal I-beams were bent at a nearby metal building, indicating F2 to F3 damage. Three nearby semi-tractor trailer delivery trucks and a bread delivery truck were overturned. Two of these trucks were reported to have been lifted "two to three feet off of the ground" as they were overturned. At a nearby Wal-Mart department store 100 to 200 employees had taken shelter, having practiced their severe weather drill the day before. The store was hit and severely damaged, with the employees sustaining only a few minor injuries. Additional roof damage was reported at Marble Falls High School. Students had just executed a tornado drill as the storm struck. There was extensive peeling of metal from the auditorium and gymnasium roofs. In summary, over 440 homes sustained damage, with one house and 17 mobile homes destroyed and major damage to 36 homes. Eighteen businesses reported major damage with 47 others reporting minor damage. In addition, two bridges were damaged, along with severe damage to schools. In all, 512 structures sustained damage.

On May 15, 1922, a tornado developed in McLennan County north of Lorena. Damage was rated F2. There were no deaths or injuries.

That same day, another tornado developed in McLennan County near Downsville. Damage was rated F2. There were two injuries but no deaths.

That same day, a tornado developed in Williamson County northeast of Taylor. The tornado produced damage rated F2, but there were no deaths or injuries.

On May 16, 1953, a tornado developed in Leon County near Jewitt. The tornado moved from five miles southwest of Jewitt to near Centerville. It produced damage rated F2, with three injuries but no deaths. The tornado had a maximum path width of 150 yards and a path length of 12 miles.

On May 17, 1939, a tornado developed near Hewitt in McLennan County. Damaged was rated F2. There were three injuries and one death which occurred when one house was destroyed. Wind and hail caused over $1 million in damage across Central Texas on this day.

On May 17, 1989, a tornado developed 3 miles south-southwest of Jarrell in Williamson County shortly after 4:30am. The tornado moved to the northeast right up IH-35 through Jarrell. Many homes were damaged or destroyed. Damage was rated F3. There were 28 injuries and one death. The maximum path width was 1,500 yards but the path length was less than five miles.

On May 18, 1902, a tornado developed near Ben Hur in Limestone County and moved through the Shiloh community to Fairfield in Freestone County. Twelve people were injured and three were killed. The deaths occurred in the Ben Hur community. Thirty homes were damaged or destroyed in Fairfield, and the county courthouse was one of the buildings damaged. The path width of this tornado is not recorded but the path length was 40 miles.

On this same day, not truly in Central Texas but not too far removed, a violent tornado struck Goliad in Goliad County, southeast of San Antonio between Victoria and Beeville. Damage was rated F4. The tornado caused 114 deaths and at least 250 injuries. The maximum path width was 250 yards, and the path length was 15 miles.  It was reported that many of the deaths occurred days after the tornado event as people who were injured died of their wounds.

On May 18, 1935,  a tornado developed at Caldwell in Burleson County. Fifteen homes were damaged but there were no reported injuries or deaths. Damage was rated F2. The maximum path width was 100 yards and the path length was two miles.

That same day, a tornado developed a Hearne in Robertson County. Damage was rated F2. There were eight people injured but no deaths. Eight homes were destroyed and thirty were damaged. The maximum path width was 200 yards and the path length was six miles. It is possible that the same thunderstorm that produced the Caldwell tornado also produced the Hearne tornado.

That same day, a tornado developed in Freestone County four miles east of Fairfield. Several homes were damaged or destroyed. The damage wasd rated  F2. One person was injured. The maximum path width was 70 yards and the path length was fifteen miles. Numerous tornadoes occurred outside of Central Texas later the same day.
 
On May 18, 1966, a tornado developed near Florence in Williamson County. Damage was rated F2. There were no injuries or deaths.


Each day I will provide  information if significant tornadoes (that is, with damage rated F2 or greater) have occurred on that given date in the past. This history will be for Central Texas, roughly bounded on the north by Weatherford, Fort Worth and Dallas, on the east by Corsicana and Centerville, on the southeast by College Station, on the south by San Antonio, on the southwest by Junction, and on the northwest by Brownwood. Click here for a map showing counties covered.


Additional Radar Resources
Nexrad data from the Central Texas nexrad radar (GRK, near Granger) and six other nearby nexrad radars. On each page, clicking on the radar image will bring up the VAD Wind Profile from that radar. Across the top of each page, you can also select other products from the GRK radar only. All of these images are displayed courtesy of Paul Sirvatka at the College of DuPage.

>>>For GRK and radars west through north, click this link.

>>>For GRK and radars southeast through southwest, click this link

Joplin Tornado on Springfield, Missouri WSR-88D (Nexrad)

I have created some four-panel graphics showing the evolution of the tornado that devastated Joplin, Missouri on Sunday , May 22nd). Each of the four-panel graphics shows 0.5 deg base reflectivity, 0.5 degree storm-relative velocity, echo tops, and normalized rotation (Nrot). All of these were generated using the GR2-Analyst software and archived Level 2 radar data obtained from the NCDC nexrad archive website. The current views cover 5:05pm CDT through 5:48pm CDT.  KSGF was operating in VCP 211 during this event.  I will probably add some additional times both prior to 5:05pm and subsequent to 5:48pm. Click on the time from the list below to view the graphic for that time.

I have created some four-panel graphics showing the evolution of the tornado that devastated Joplin, Missouri on Sunday, May 22nd.  Each of the four-panel graphics shows 0.5 deg base reflectivity, 0.5 degree storm-relative velocity, echo tops, and normalized rotation (Nrot). All of these were generated using the GR2-Analyst software and archived Level 2 radar data obtained from the NCDC nexrad archive website. The current views cover 5:05pm CDT through 5:48pm CDT.  KSGF was operating in VCP 211 during this event.  For those who might want to know, the SGF radar site is 54nm from Joplin on a heading of ~080 degrees. I will probably add some additional times both prior to 5:05pm and subsequent to 5:48pm. Click on the time from the list below to view the graphic for that time.

{As of 6-1-2011 at 6:00pm CDT, I have edited all of the SRV and NROT products to delete the automated MESO and TVS detects in the interest of better viewing of the raw data.]

2205UTC/5:05pm 2210UTC/5:10pm 2215UTC/5:15pm 2219UTC/5:19pm 2224UTC/5:24pm 2229UTC/5:29pm 2234UTC/5:34pm 2239UTC/5:39pm     2244UTC/5:44pm    2248UTC/5:48pm

Here are links to the following products: Surface data plots for 3:00pm, 4:00pm and 5:00pm (note the backing surface wind at Joplin); VAD wind profile plots from SGF WSR-88D at 3:57pm and 5:00pm CDT; and the 7pm CDT (23/00UTC) SGF upper air sounding (skew-T) and hodograph.


May 6, 2006 Waco Tornado: Radar images and other information on second Waco tornado in one week period ...
March 21, 2005 Tornado near Marlin  Preliminary data and link to photos by Bill Purcell, a storm  chaser from Houston ...
Memorial Day Storm, 2004: Images from the 5-31-2004 (Memorial Day) severe thunderstorm that affected Bell and Falls counties ...
Jarrell 'Reprise':A Fresh Look at the Central Texas Tornado Outbreak of 1997 ...
On the Automated Detection of Severe Storms and Tornadoes: Can Doppler radar automatically detect or predict tornadoes?



If you need a refresher on the significance of severe storm forecast parameters, click here .

When I am unable to get updates posted, please refer to issuances from the Storm Prediction Center (links below) and to the Hazardous Weather Outlookproduct issued by Fort Worth and other NWS offices.


Current Severe Storm Warnings and Forecasts

Current Warnings and Advisories for Texas

Storm Prediction Center Discussion for Localized Threats (MCD)

Storm Prediction Center Outlooks (Day 1, Day 2, Day 3 and Experimental Days 4-8)

Storm Prediction Center Severe Storm and Tornado Watches


Tornado Outbreaks Spawned by Tropical Cyclones at Landfall
The subject of tornadoes produced by landfalling tropical cyclones (tropical storms and hurricanes) has been a fascination (and a research interest) of mine for years. After working through several iterations of the research, the final manuscript was submitted an the A.M.S. journal. The A.M.S. journals, like most scientific publications, subject proposed articles to a formal peer review process. My manuscript has now been published in the April issue of Weather and Forecasting. Here is a link to the article. [Note: viewing requires Adobe Acrobat Reader.]

Computer Forecasts of Severe Storm Parameters

Have you ever wondered how computer models of the atmosphere can be used to forecast severe storms, check out this section in which I briefly explain some of the computer products and parameters used in forecasting severe storms.


Severe Storms in Central Texas

Click here to access a section describing the forecasts and nowcasts of significant severe storm events in Central Texas!


Other Related Links

Current Southern Plains Surface Map (ideal for doing your own analysis)

Latest Hi-Res Visible Satellite Image centered on Central Texas

Latest Water Vapor Satellite Image from the eastern GOES

  Highway Overpasses are not tornado shelters! Click here to find out why.

Back to my main homepage

Jump to my section on storm and nature photography


And perhaps you'd like to know how we're doing on rainfall and soil moisture conditions so far this year. Here's a clickable link to the Climate Prediction Center's latest map showing the Drought Severity Index (Palmer Long Term Index) for the U.S. By the way, if you're looking for that neat high-resolution visible satellite image which previously occupied this space, it's gone. But if you liked that shot, you can get them directly from NASA's Global Hydrology and Climate Center at the NASA MSFC, Huntsville, Alabama at this clickable link.


This page was last updated on 12-16-2011.

If you have comments or suggestions, email me at curtis@vvm.com


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