Lewisville, Texas Weather Conditions

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Current Conditions

  • 83°
  • Clear
  • Wind: South 16 mph
  • Humidity: 65%
  • Visibility: 10.0 miles
  • Dew Point: 70°
  • Pressure: 29.83 in. 0
  • Heat Index: 87

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Next 12 Hours

4  am
7  am
10  am
1  pm
4  pm
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
Partly Cloudy
79°
77°
82°
90°
95°
Forecast data from the National Digital Forecast Database.

5 Day Forecast

  • Tuesday
  • Partly Cloudy
  • High: 95 °
  • Low: 77 °
  • Partly Cloudy
  • Wednesday
  • Partly Cloudy
  • High: 95 °
  • Low: 75 °
  • Partly Cloudy
  • Thursday
  • Partly Cloudy
  • High: 95 °
  • Low: 75 °
  • Partly Cloudy
  • Friday
  • Partly Cloudy
  • High: 95 °
  • Low: 75 °
  • Partly Cloudy
  • Saturday
  • Chance of a Thunderstorm
  • High: 93 °
  • Low: 75 °
  • Chance of a Thunderstorm

Forecast for Lewisville, Texas

Updated: 4:00 AM CDT on September 02, 2014

  • Tuesday

    Partly cloudy. High of 95F with a heat index of 100F. Winds from the South at 10 to 15 mph.

  • Tuesday Night

    Partly cloudy. Low of 77F. Winds from the South at 10 to 15 mph.

  • Wednesday

    Partly cloudy. High of 95F. Winds from the South at 10 to 15 mph.

  • Wednesday Night

    Partly cloudy. Low of 75F. Winds from the South at 10 to 15 mph.

  • Thursday

    Partly cloudy. High of 95F. Winds from the South at 5 to 10 mph.

  • Thursday Night

    Mostly cloudy in the evening, then clear. Low of 75F. Winds from the SSE at 5 to 10 mph.

  • Friday

    Partly cloudy. High of 95F. Winds from the South at 5 to 10 mph.

  • Friday Night

    Partly cloudy in the evening, then clear. Low of 75F. Winds from the SSE at 5 to 10 mph.

  • Saturday

    Partly cloudy with a chance of a thunderstorm and rain in the afternoon. High of 93F. Winds from the SSE at 5 to 10 mph. Chance of rain 20%.

  • Saturday Night

    Mostly cloudy. Low of 75F. Winds from the East at 5 to 10 mph.

  • Sunday

    Mostly cloudy with a chance of a thunderstorm. High of 93F. Winds less than 5 mph. Chance of rain 20%.

  • Sunday Night

    Partly cloudy with a chance of a thunderstorm. Low of 75F. Winds from the SE at 5 to 10 mph. Chance of rain 40% with rainfall amounts near 0.2 in. possible.

  • Monday

    Partly cloudy. High of 93F. Winds from the SSE at 5 to 10 mph.

  • Monday Night

    Partly cloudy. Low of 75F. Winds from the SSE at 5 to 10 mph.

  • Tuesday

    Partly cloudy. High of 91F. Winds from the South at 10 to 15 mph.

  • Tuesday Night

    Partly cloudy. Low of 75F. Winds from the SSE at 5 to 15 mph.

  • Wednesday

    Partly cloudy. High of 93F. Winds from the South at 5 to 10 mph.

  • Wednesday Night

    Clear. Low of 75F. Winds from the SSE at 5 to 10 mph.

  • Thursday

    Partly cloudy with a chance of a thunderstorm. High of 91F. Winds less than 5 mph. Chance of rain 50%.

  • Thursday Night

    Mostly cloudy with a chance of a thunderstorm. Low of 73F. Winds less than 5 mph. Chance of rain 60% with rainfall amounts near 0.5 in. possible.

  • Friday

    Mostly cloudy with a chance of a thunderstorm. High of 91F. Winds less than 5 mph. Chance of rain 50%.

  • Friday Night

    Clear. Low of 73F. Winds less than 5 mph.

Personal Weather Stations

Personal Weather Stations [Add your weather station!]

Location: Peninsula at Twin Coves, Flower Mound, TX

Updated: 4:06 AM CDT

Temperature: 83.1 °F Dew Point: 72 °F Humidity: 70% Wind: SSE at 7.6 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: Villages of Northshore, Flower Mound, TX

Updated: 3:56 AM CDT

Temperature: 81.1 °F Dew Point: 71 °F Humidity: 72% Wind: WSW at 3.7 mph Pressure: 29.80 in Hourly Precipitation: - Heat Index: 85 °F Graphs

Location: Quail Run, Flower Mound, TX

Updated: 4:02 AM CDT

Temperature: 81.5 °F Dew Point: 68 °F Humidity: 64% Wind: South at 4.7 mph Pressure: 29.51 in Hourly Precipitation: - Heat Index: 84 °F Graphs

Location: Churchill Crossing, Flower Mound, TX

Updated: 4:07 AM CDT

Temperature: 81.7 °F Dew Point: 72 °F Humidity: 72% Wind: SSE at 2.9 mph Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Creekwood Estates (Just SE of 2499 & 1171), Flower Mound, TX

Updated: 4:05 AM CDT

Temperature: 81.8 °F Dew Point: 72 °F Humidity: 72% Wind: Calm Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Lake Forest 75028, Flower Mound, TX

Updated: 4:04 AM CDT

Temperature: 81.7 °F Dew Point: 71 °F Humidity: 70% Wind: ESE at 3.2 mph Pressure: 28.25 in Hourly Precipitation: - Heat Index: 86 °F Graphs

Location: Westchester, Flower Mound, TX

Updated: 4:07 AM CDT

Temperature: 82.8 °F Dew Point: 75 °F Humidity: 78% Wind: SE at 6.0 mph Pressure: 29.73 in Hourly Precipitation: 0.00 in Heat Index: 90 °F Graphs

Location: 114th RC Aero Squadron, Southlake, TX

Updated: 3:42 AM CDT

Temperature: 83.3 °F Dew Point: 72 °F Humidity: 69% Wind: South at 9.0 mph Pressure: 29.80 in Hourly Precipitation: 0.00 in Heat Index: 89 °F Graphs

Location: Stone Creek, Flower Mound, TX

Updated: 3:56 AM CDT

Temperature: 81.9 °F Dew Point: 72 °F Humidity: 71% Wind: South at 5.8 mph Pressure: 29.66 in Hourly Precipitation: - Heat Index: 86 °F Graphs

Location: Grapevine Fairway C70, Grapevine, TX

Updated: 3:40 AM CDT

Temperature: 83.7 °F Dew Point: - Humidity: 64% Wind: North at - Pressure: 29.23 in Hourly Precipitation: - Heat Index: 88 °F Graphs

Location: Wildwood Estates, Flower Mound, TX

Updated: 4:03 AM CDT

Temperature: 82.0 °F Dew Point: 72 °F Humidity: 72% Wind: Calm Pressure: 29.77 in Hourly Precipitation: 0.00 in Heat Index: 87 °F Graphs

Location: Lost Creek Estates, Flower Mound, TX

Updated: 4:07 AM CDT

Temperature: 82.6 °F Dew Point: 70 °F Humidity: 67% Wind: SE at 11.5 mph Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: 87 °F Graphs

Location: Timberview Estates West, Flower Mound, TX

Updated: 3:57 AM CDT

Temperature: 81.5 °F Dew Point: 71 °F Humidity: 70% Wind: Calm Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Woodview at Morriss, Flower Mound, TX

Updated: 4:07 AM CDT

Temperature: 82.0 °F Dew Point: 71 °F Humidity: 70% Wind: SW at 4.0 mph Pressure: 29.78 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Loch Meadow Estates, Southlake, TX

Updated: 4:07 AM CDT

Temperature: 81.1 °F Dew Point: 70 °F Humidity: 70% Wind: NE at 4.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 85 °F Graphs

Location: W5CGC / KE7A, Southlake, TX

Updated: 3:54 AM CDT

Temperature: 82.6 °F Dew Point: 72 °F Humidity: 71% Wind: SE at 4.0 mph Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: 88 °F Graphs

Location: Corporate at Cindy Ln., Lewisville, TX

Updated: 4:06 AM CDT

Temperature: 81.9 °F Dew Point: 70 °F Humidity: 68% Wind: NNE at 2.7 mph Pressure: 29.57 in Hourly Precipitation: - Heat Index: 86 °F Graphs

Location: Chimney Rock, Flower Mound, TX

Updated: 4:07 AM CDT

Temperature: 80.4 °F Dew Point: 71 °F Humidity: 72% Wind: Calm Pressure: 29.33 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: Double Oak Fire Dept, Double Oak, TX

Updated: 3:57 AM CDT

Temperature: 81.2 °F Dew Point: 69 °F Humidity: 67% Wind: SSE at 3.0 mph Pressure: 29.72 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: Timber Creek, Flower Mound, TX

Updated: 4:07 AM CDT

Temperature: 81.9 °F Dew Point: 72 °F Humidity: 73% Wind: SE at 7.6 mph Pressure: 30.05 in Hourly Precipitation: 0.00 in Heat Index: 87 °F Graphs

Location: Lakemont, Flower Mound, TX

Updated: 4:05 AM CDT

Temperature: 83.0 °F Dew Point: 72 °F Humidity: 70% Wind: SSW at 9.0 mph Pressure: 29.80 in Hourly Precipitation: 0.00 in Heat Index: 88 °F Graphs

Location: FM3040 at Old Orchard, Lewisville, TX

Updated: 4:07 AM CDT

Temperature: 81.9 °F Dew Point: 72 °F Humidity: 71% Wind: South at 3.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Lewisville, Lewisville, TX

Updated: 4:06 AM CDT

Temperature: 82.0 °F Dew Point: 72 °F Humidity: 71% Wind: SSW at 4.2 mph Pressure: 29.81 in Hourly Precipitation: - Heat Index: 87 °F Graphs

Location: Indian Oaks, Lewisville, TX

Updated: 4:07 AM CDT

Temperature: 82.2 °F Dew Point: 70 °F Humidity: 66% Wind: Calm Pressure: 29.84 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Liberty Park, Southlake, TX

Updated: 4:07 AM CDT

Temperature: 81.6 °F Dew Point: 71 °F Humidity: 70% Wind: South at 3.0 mph Pressure: 29.85 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Canyon Oaks, Argyle, TX

Updated: 4:07 AM CDT

Temperature: 82.0 °F Dew Point: 71 °F Humidity: 70% Wind: Calm Pressure: 29.83 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Woodlake Apartments, Grapevine, TX

Updated: 4:03 AM CDT

Temperature: 82.3 °F Dew Point: 72 °F Humidity: 71% Wind: SSW at 2.0 mph Pressure: 29.67 in Hourly Precipitation: - Heat Index: 87 °F Graphs

Location: HV 2, Highland Village, TX

Updated: 4:07 AM CDT

Temperature: 81.1 °F Dew Point: 70 °F Humidity: 70% Wind: South at 2.2 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 85 °F Graphs

Location: Trophy Club, TX, Trophy Club, TX

Updated: 4:04 AM CDT

Temperature: 80.6 °F Dew Point: 70 °F Humidity: 71% Wind: WSW at 1.1 mph Pressure: 30.03 in Hourly Precipitation: 0.00 in Heat Index: 84 °F Graphs

Location: Highland Shores, Highland Village, TX

Updated: 4:07 AM CDT

Temperature: 82.5 °F Dew Point: 71 °F Humidity: 69% Wind: SSE at 1.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 87 °F Graphs

Location: Highland Shores 2, Highland Village, TX

Updated: 4:07 AM CDT

Temperature: 82.1 °F Dew Point: 71 °F Humidity: 69% Wind: SSW at 4.0 mph Pressure: 29.86 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Highland Shores 1, Highland Village, TX

Updated: 4:07 AM CDT

Temperature: 82.4 °F Dew Point: 71 °F Humidity: 68% Wind: SE at 4.0 mph Pressure: 29.90 in Hourly Precipitation: 0.00 in Heat Index: 87 °F Graphs

Location: Highland Village, Highland Village, TX

Updated: 4:07 AM CDT

Temperature: 82.0 °F Dew Point: 71 °F Humidity: 70% Wind: SW at 4.0 mph Pressure: 29.79 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Lakeslide Estates, Lewisville, TX

Updated: 4:07 AM CDT

Temperature: 81.9 °F Dew Point: 72 °F Humidity: 71% Wind: Calm Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Shadow Ridge, Coppell, TX

Updated: 4:07 AM CDT

Temperature: 81.5 °F Dew Point: 71 °F Humidity: 70% Wind: SSE at 8.0 mph Pressure: 29.82 in Hourly Precipitation: 0.00 in Heat Index: 86 °F Graphs

Location: Timarron, Southlake, TX

Updated: 3:59 AM CDT

Temperature: 81.3 °F Dew Point: 74 °F Humidity: 80% Wind: Calm Pressure: 29.68 in Hourly Precipitation: - Heat Index: 87 °F Graphs

Location: 445 Ranch, Argyle, TX

Updated: 3:46 AM CDT

Temperature: 82.6 °F Dew Point: 71 °F Humidity: 68% Wind: SW at 4.7 mph Pressure: 29.56 in Hourly Precipitation: - Heat Index: 87 °F Graphs

MSN Maps of:

Temp: Dew Point: Humidity Wind Pressure Hr Precip -

NWS Forecaster Discussion




Area forecast discussion 
National Weather Service Fort Worth Texas 
401 am CDT Tuesday Sep 2 2014 


Discussion... 


08z/3am regional radar derived winds (vad winds) indicated a 35 knots 
low level jet in place extending from central Texas north to the 
OK/Kansas border. A frontal boundary was in place along the Kansas/OK 
border as indicated by surface observations...and numerous 
thunderstorms were active along the front at the time of this 
discussion per regional radar imagery. 00z upper air analysis 
continued to show upper level ridging over much of Texas at the 
500 mb level...and the 00z forward radiosonde observation showed a Stout middle-level cap 
in place over the County Warning Area as a result of persistent subsidence 
associated with this upper level ridge. Infrared and water vapor 
satellite imagery continued to track an area of organized 
thunderstorm activity over the Bay of Campeche. Overnight the 
National Hurricane Center upgraded this activity to tropical storm 
strength...so we officially have Tropical Storm Dolly...which was 
moving to the northwest early this morning. 


Today...there are a couple of features to watch today that may 
bring thunderstorms across parts of north and central Texas. The 
first is the thunderstorm activity ongoing along the OK/Kansas border 
this morning...and the second is a surge of moisture associated 
with Dolly moving northwest later today. 


For this morning...high resolution models are indicating that the 
thunderstorm activity along the OK/Kansas border will start to become 
strongly influenced by propagation and move south right around 
sunrise. This is assuming that this thunderstorm complex can 
become organized enough for its cold pool to move this line of 
storms in a new direction this morning. 


..this next paragraph is an explanation of those factors that 
dictate storm motion and really does not contribute to the 
forecast...it is included to help provide insight/understanding 
for those interested. You can skip this next paragraph to 
continue on with the forecast discussion... 




In a basic sense...the movement of thunderstorm systems is 
controlled by the average of the winds aloft...often referred to 
as the steering winds. In most cases...thunderstorms will simply 
move in the direction in which the winds aloft are blowing. 
However the second component to consider is often referred to as 
the propagation component of storm motion. Propagation influences 
storm motion by changing the direction of motion of a thunderstorm 
system in the direction that new thunderstorms develop. This is 
the more complicated factor to understand...but in general...new 
thunderstorms tend to develop in the opposite direction of the low 
level jet. On a day like today...where the steering winds are 
somewhat light due to upper level ridging over Texas...but the 
low-level jet is relatively strong...the propagation component can 
dominate the direction in which the thunderstorm system moves. For 
today...the steering winds are somewhat light and would indicate 
an easterly storm motion. This is why the storms are just sort of 
sitting there along the front as of 3 am. However if this results 
in a strong enough cold pool (a collection of rain cooled air) 
this cold pool could start to surge south...causing new storms to 
develop in the opposite direction of the low-level jet. Since the 
low-level jet extends from our County Warning Area to the front...the whole 
complex of storms could start to move south directly towards the 
Red River...but will still move at least slightly to the east due 
to the steering winds aloft. This is a dramatic shift in direction 
from what storms have been doing overnight...but it makes sense in 
the context of what was described above. 




The Main Point of uncertainty this morning is: will 
thunderstorms become organized enough to move as a system? 


That is largely unknown because just looking at the storms on 
radar is not enough to determine how strong the cold pool will 
get...but the fact that the hrrr and the Texas tech WRF both 
advertise a dramatic shift to the south of thunderstorms towards 
the Red River around sunrise gives confidence in this solution. 
Went ahead and placed a very small area of 20 probability of precipitation in the forecast 
from just north of Sherman extending to the southeast including 
much of Lamar County. If the storms do move to the south as these 
high resolution models indicate...they will be in their 
dissipating stages by the time they cross the Red River well 
after sunrise this morning...so no strong or severe weather is 
expected at this time. 


This afternoon...models continue to consistently show a surge of 
tropical moisture to the northwest from the Texas Gulf Coast this 
afternoon. This surge of moisture appears to be associated with a 
subtle but important middle-level wind shift associated with Dolly 
moving northwest towards the northern Mexico Gulf Coast. This 
deeper tropical moisture is expected to remain south of the 
Interstate 20 corridor this afternoon...so reoriented probability of precipitation a bit 
to highlight the southern half of the County Warning Area. In general...there is 
still no obvious lift...so the coverage of storms will probably be 
isolated in nature...and left probability of precipitation at the 20 percent level for now. 


Wednesday through Friday...Dolly is expected to make landfall over 
northern Mexico late this evening...and then continue off to the 
west-northwest through the end of the week. Models seem to send 
the deeper middle-level tropical moisture plume to the west with 
Dolly...so went ahead and removed probability of precipitation from the forecast on 
Wednesday afternoon across the southern County Warning Area and left the remainder 
of the forecast dry. Weak upper level ridging is the dominant 
feature during this time frame...so expect subsidence to win out 
in keeping things dry across north and central Texas. 


This weekend...models continue to hint at a cold front moving 
south of the Red River sometime Saturday afternoon through Sunday 
morning. Models still seem to indicate that the primary reason 
that the front makes it south of the Red River is due to 
persistent thunderstorm activity along the front late this week. 
If the frontal motion is really dependent upon persistent 
thunderstorm activity...confidence in the timing and placement of 
the front is going to remain low until late this week. 


The biggest reason for optimism in the front making it this far 
south is observing what happens today. If mesoscale convective system activity from the 
OK/Kansas border actually surges south this morning...it becomes easy 
to see how persistent storms to our north can send a strong 
outflow boundary/front across North Texas under weak ridging 
aloft. The front is most likely to be in place over the County Warning Area on 
Sunday...so left probability of precipitation mainly along and north of Interstate 20 on 
Saturday...and kept them broad brushed over the entire County Warning Area on 
Sunday. 


Early next week...the front...assuming it makes it here this 
weekend...will probably dissipate by Monday. Because the front 
does not represent a true airmass replacement...that is...there is 
no Canadian/or significantly cool air to the north of this 
front...it will undergo frontolysis and lose definition quickly 
under ridging aloft. Left the forecast for early next week dry as 
a result. 


Cavanaugh 




&& 


Aviation... 
/issued 1130 PM CDT Monday Sep 1 2014/ 
VFR conditions area-wide will become briefly interrupted by a 
period of MVFR during the Tuesday morning hours as stratus spreads 
northward in the southerly low level flow. We have now included 
MVFR ceilings indiscriminately based on the most recent model 
data...with onset at 08z in kact and 11-12z in the metroplex. Ceilings 
should scatter out in the 15-17z timeframe...otherwise persistent 
south to southeast winds can be expected. 


30 




&& 


Preliminary point temps/pops... 
Dallas-ft. Worth, Texas 97 77 96 77 96 / 5 5 5 5 0 
Waco, Texas 98 75 97 74 97 / 20 20 10 5 5 
Paris, Texas 92 72 91 72 92 / 20 10 5 5 0 
Denton, Texas 96 75 95 74 95 / 10 5 5 0 0 
McKinney, Texas 95 74 94 74 94 / 10 5 5 5 0 
Dallas, Texas 97 78 96 78 96 / 5 5 5 5 0 
Terrell, Texas 96 76 96 75 96 / 10 10 5 5 0 
Corsicana, Texas 97 76 96 75 96 / 20 20 10 5 5 
Temple, Texas 98 72 97 73 97 / 20 20 10 5 5 
Mineral Wells, Texas 97 73 96 72 96 / 5 5 5 0 0 


&& 


Forward watches/warnings/advisories... 
none. 


&& 


$$ 


/ 










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