Excessive Heat Warning 2, NWS Austin/San Antonio, TX

000 
WWUS74 KEWX 150748
NPWEWX

URGENT - WEATHER MESSAGE
National Weather Service Austin/San Antonio TX
248 AM CDT Sat Aug 15 2020

TXZ208-209-152100-
/O.EXA.KEWX.EH.W.0002.200815T1800Z-200816T0000Z/
/O.EXT.KEWX.HT.Y.0007.000000T0000Z-200815T1800Z/
Caldwell-Fayette-
Including the cities of Lockhart and La Grange
248 AM CDT Sat Aug 15 2020

...HEAT ADVISORY NOW IN EFFECT UNTIL 1 PM CDT THIS AFTERNOON...
...EXCESSIVE HEAT WARNING IN EFFECT FROM 1 PM THIS AFTERNOON TO
7 PM CDT THIS EVENING...

* WHAT...For the Excessive Heat Warning, dangerously hot 
  conditions with heat index values up to 109 expected. For the 
  Heat Advisory, heat index values up to 103.

* WHERE...Caldwell and Fayette Counties.

* WHEN...For the Excessive Heat Warning, from 1 PM this 
  afternoon to 7 PM CDT this evening. For the Heat Advisory, 
  until 1 PM CDT this afternoon.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

TXZ171>173-192>194-152100-
/O.CON.KEWX.EH.W.0002.200815T1800Z-200816T0000Z/
/O.CON.KEWX.HT.Y.0007.000000T0000Z-200815T1800Z/
Llano-Burnet-Williamson-Travis-Bastrop-Lee-
Including the cities of Llano, Burnet, Georgetown, Austin, 
Bastrop, and Giddings
248 AM CDT Sat Aug 15 2020

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 1 PM CDT THIS
AFTERNOON...
...EXCESSIVE HEAT WARNING REMAINS IN EFFECT FROM 1 PM THIS
AFTERNOON TO 7 PM CDT THIS EVENING...

* WHAT...For the Excessive Heat Warning on Saturday, dangerously 
  hot conditions with temperatures expected to reach the 105 to 
  106 degree range and heat index values up to 110 expected. For 
  the Heat Advisory today, temperatures are expected to range 
  from 103 to 104 degress and heat index values up to 108.

* WHERE...Llano, Burnet, Williamson, Travis, Bastrop and Lee 
  Counties.

* WHEN...For the Excessive Heat Warning, from 1 PM to 7 PM CDT 
  Saturday. For the Heat Advisory, until 1 PM CDT Saturday.

* IMPACTS...Extreme heat and humidity will significantly 
  increase the potential for heat related illnesses, 
  particularly for those working or participating in outdoor 
  activities.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

TXZ184>191-203>207-219>225-152100-
/O.CON.KEWX.HT.Y.0007.000000T0000Z-200816T0000Z/
Edwards-Real-Kerr-Bandera-Gillespie-Kendall-Blanco-Hays-Uvalde-
Medina-Bexar-Comal-Guadalupe-Frio-Atascosa-Wilson-Karnes-Gonzales-
De Witt-Lavaca-
Including the cities of Rocksprings, Leakey, Kerrville, Bandera, 
Fredericksburg, Boerne, Blanco, San Marcos, Uvalde, Hondo, 
San Antonio, New Braunfels, Seguin, Pearsall, Pleasanton, 
Floresville, Karnes City, Gonzales, Cuero, and Halletsville
248 AM CDT Sat Aug 15 2020

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING...

* WHAT...Air temperatures from 100 to 106 degrees. Heat index 
  values up to 111 degrees.

* WHERE...Most of South Central Texas, with the exception of the 
  Rio Grande Plains.

* WHEN...Until 7 PM CDT Saturday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

891 
WWUS74 KEWX 151537
NPWEWX

URGENT - WEATHER MESSAGE
National Weather Service Austin/San Antonio TX
1037 AM CDT Sat Aug 15 2020

TXZ171>173-192>194-208-209-160000-
/O.CAN.KEWX.HT.Y.0007.000000T0000Z-200815T1800Z/
/O.EXT.KEWX.EH.W.0002.200815T1537Z-200816T0000Z/
Llano-Burnet-Williamson-Travis-Bastrop-Lee-Caldwell-Fayette-
Including the cities of Llano, Burnet, Georgetown, Austin, 
Bastrop, Giddings, Lockhart, and La Grange
1037 AM CDT Sat Aug 15 2020

...EXCESSIVE HEAT WARNING NOW IN EFFECT UNTIL 7 PM CDT THIS
EVENING...

* WHAT..Dangerously hot conditions with air temperatures expected
  to reach 105 to 107 degrees and heat index values up to 111 
  possible.

* WHERE...Williamson, Caldwell, Fayette, Llano, Burnet, Lee, 
  Travis and Bastrop Counties.

* WHEN...Until 7 PM CDT this evening.

* IMPACTS...Extreme heat and humidity will significantly 
  increase the potential for heat related illnesses, 
  particularly for those working or participating in outdoor 
  activities.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

TXZ191-204>207-219>221-223-160000-
/O.UPG.KEWX.HT.Y.0007.000000T0000Z-200816T0000Z/
/O.EXB.KEWX.EH.W.0002.200815T1537Z-200816T0000Z/
Hays-Medina-Bexar-Comal-Guadalupe-Frio-Atascosa-Wilson-Gonzales-
Including the cities of San Marcos, Hondo, San Antonio, 
New Braunfels, Seguin, Pearsall, Pleasanton, Floresville, 
and Gonzales
1037 AM CDT Sat Aug 15 2020

...EXCESSIVE HEAT WARNING IN EFFECT UNTIL 7 PM CDT THIS EVENING...

* WHAT...Dangerously hot conditions with air temperatures expected
  to reach the 104 to 106 degrees and heat index values up to 110
  possible.

* WHERE...Hays, Medina, Bexar, Comal, Guadalupe, Frio, Atascosa, 
  Wilson and Gonzales Counties.

* WHEN...Until 7 PM CDT this evening.

* IMPACTS...Hot temperatures and high humidity may cause heat
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

TXZ183-202-217-218-228-160000-
/O.EXA.KEWX.HT.Y.0007.000000T0000Z-200816T0000Z/
Val Verde-Kinney-Maverick-Zavala-Dimmit-
Including the cities of Del Rio, Bracketville, Eagle Pass, 
Crystal City, and Carrizo Springs
1037 AM CDT Sat Aug 15 2020

...HEAT ADVISORY IN EFFECT UNTIL 7 PM CDT THIS EVENING...

* WHAT...Hot conditions with air temperatures expected to reach
  106 to 110 degrees in some areas.

* WHERE...Val Verde, Kinney, Maverick, Zavala and Dimmit 
  Counties.

* WHEN...Until 7 PM CDT Saturday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

TXZ184>190-203-222-224-225-160000-
/O.CON.KEWX.HT.Y.0007.000000T0000Z-200816T0000Z/
Edwards-Real-Kerr-Bandera-Gillespie-Kendall-Blanco-Uvalde-Karnes-
De Witt-Lavaca-
Including the cities of Rocksprings, Leakey, Kerrville, Bandera, 
Fredericksburg, Boerne, Blanco, Uvalde, Karnes City, Cuero, 
and Halletsville
1037 AM CDT Sat Aug 15 2020

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING...

* WHAT...Hot conditions with air temperatures expected to reach
  around 103 degrees in some areas.

* WHERE...Most of South Central Texas, with the exception of the 
  Rio Grande Plains.

* WHEN...Until 7 PM CDT Saturday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

932 
WWUS74 KEWX 151924
NPWEWX

URGENT - WEATHER MESSAGE
National Weather Service Austin/San Antonio TX
224 PM CDT Sat Aug 15 2020

TXZ171>173-191>194-204>209-219>221-223-161100-
/O.EXB.KEWX.HT.Y.0007.200816T0000Z-200817T0000Z/
/O.CON.KEWX.EH.W.0002.000000T0000Z-200816T0000Z/
Llano-Burnet-Williamson-Hays-Travis-Bastrop-Lee-Medina-Bexar-
Comal-Guadalupe-Caldwell-Fayette-Frio-Atascosa-Wilson-Gonzales-
Including the cities of Llano, Burnet, Georgetown, San Marcos, 
Austin, Bastrop, Giddings, Hondo, San Antonio, New Braunfels, 
Seguin, Lockhart, La Grange, Pearsall, Pleasanton, Floresville, 
and Gonzales
224 PM CDT Sat Aug 15 2020

...EXCESSIVE HEAT WARNING REMAINS IN EFFECT UNTIL 7 PM CDT THIS
EVENING...
...HEAT ADVISORY IN EFFECT SUNDAY...

* WHAT...For the Excessive Heat Warning this afternoon and early
  evening, dangerously hot conditions with air temperatures
  expected to reach 104 to 107 degrees and heat index values
  around 111 possible in some areas. For the Heat Advisory Sunday,
  air temperatures expected to reach 102 to 105 degrees and heat 
  index values up to around 110 possible.

* WHERE...Portions of south central Texas.

* WHEN...For the Excessive Heat Warning, until 7 PM CDT this
  evening. For the Heat Advisory, Sunday through 7 PM CDT.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

TXZ184>190-203-222-224-225-161100-
/O.EXT.KEWX.HT.Y.0007.000000T0000Z-200817T0000Z/
Edwards-Real-Kerr-Bandera-Gillespie-Kendall-Blanco-Uvalde-Karnes-
De Witt-Lavaca-
Including the cities of Rocksprings, Leakey, Kerrville, Bandera, 
Fredericksburg, Boerne, Blanco, Uvalde, Karnes City, Cuero, 
and Halletsville
224 PM CDT Sat Aug 15 2020

...HEAT ADVISORY NOW IN EFFECT UNTIL 7 PM CDT SUNDAY...

* WHAT...Hot conditions with air temperatures expected to reach
  around 103 degrees and heat index values up to around 110
  possible in some areas.

* WHERE...Most of South Central Texas.

* WHEN...Until 7 PM CDT Sunday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

TXZ183-202-217-218-228-160000-
/O.CON.KEWX.HT.Y.0007.000000T0000Z-200816T0000Z/
Val Verde-Kinney-Maverick-Zavala-Dimmit-
Including the cities of Del Rio, Bracketville, Eagle Pass, 
Crystal City, and Carrizo Springs
224 PM CDT Sat Aug 15 2020

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT THIS EVENING...

* WHAT...Hot conditions with air temperatures expected to reach 
  106 to 110 degrees in some areas.

* WHERE...Val Verde, Kinney, Maverick, Zavala and Dimmit 
  Counties.

* WHEN...Until 7 PM CDT Saturday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

525 
WWUS74 KEWX 160004
NPWEWX

URGENT - WEATHER MESSAGE
National Weather Service Austin/San Antonio TX
704 PM CDT Sat Aug 15 2020

TXZ171>173-191>194-204>209-219>221-223-161200-
/O.EXP.KEWX.EH.W.0002.000000T0000Z-200816T0000Z/
/O.CON.KEWX.HT.Y.0007.000000T0000Z-200817T0000Z/
Llano-Burnet-Williamson-Hays-Travis-Bastrop-Lee-Medina-Bexar-
Comal-Guadalupe-Caldwell-Fayette-Frio-Atascosa-Wilson-Gonzales-
Including the cities of Llano, Burnet, Georgetown, San Marcos, 
Austin, Bastrop, Giddings, Hondo, San Antonio, New Braunfels, 
Seguin, Lockhart, La Grange, Pearsall, Pleasanton, Floresville, 
and Gonzales
704 PM CDT Sat Aug 15 2020

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT SUNDAY...

* WHAT...Heat index values up to 109.

* WHERE...Portions of south central Texas.

* WHEN...For the Heat Advisory, Sunday through 7 PM CDT.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

TXZ183-202-217-218-228-160115-
/O.EXP.KEWX.HT.Y.0007.000000T0000Z-200816T0000Z/
Val Verde-Kinney-Maverick-Zavala-Dimmit-
Including the cities of Del Rio, Bracketville, Eagle Pass, 
Crystal City, and Carrizo Springs
704 PM CDT Sat Aug 15 2020

...HEAT ADVISORY HAS EXPIRED...

Temperatures have begun cooling and the advisory is expired.

$$

TXZ184>190-203-222-224-225-161200-
/O.CON.KEWX.HT.Y.0007.000000T0000Z-200817T0000Z/
Edwards-Real-Kerr-Bandera-Gillespie-Kendall-Blanco-Uvalde-Karnes-
De Witt-Lavaca-
Including the cities of Rocksprings, Leakey, Kerrville, Bandera, 
Fredericksburg, Boerne, Blanco, Uvalde, Karnes City, Cuero, 
and Halletsville
704 PM CDT Sat Aug 15 2020

...HEAT ADVISORY REMAINS IN EFFECT UNTIL 7 PM CDT SUNDAY...

* WHAT...Hot conditions with air temperatures expected to reach 
  around 103 degrees and heat index values up to around 110 
  possible in some areas.

* WHERE...Most of South Central Texas.

* WHEN...Until 7 PM CDT Sunday.

* IMPACTS...Hot temperatures and high humidity may cause heat 
  illnesses to occur.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Drink plenty of fluids, stay in an air-conditioned room, stay out
of the sun, and check up on relatives and neighbors. Young
children and pets should never be left unattended in vehicles
under any circumstances.

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 lightweight and loose fitting clothing when
possible. To reduce risk during outdoor work, the Occupational
Safety and Health Administration recommends scheduling frequent
rest breaks in shaded or air conditioned environments. Anyone
overcome by heat should be moved to a cool and shaded location.
Heat stroke is an emergency! Call 9 1 1.

&&

$$

Area Forecast Discussion...UPDATED
National Weather Service Austin/San Antonio TX
1256 PM CDT Fri Aug 14 2020

.AVIATION...
/18Z TAFS/
VFR conditions are expected across the area terminals through the
forecast period for the most part. South to southwest winds will
persist through tonight around 10 knots along the I-35 sites with
gusts up to 18 knots. For KDRT, a southeast to east wind flow will
prevail through the forecast cycle. Low clouds are expected to
develop late tonight across the Coastal Plains area and then push to
the north toward the I-35 airports. At this time, these clouds should
stay scattered in nature through the morning period before they
dissipate. Can't rule out an hour or two of MVFR to the south or
nearby the San Antonio area terminals around the 11z to 14z time
period.

&&

.PREV DISCUSSION... /ISSUED 1111 AM CDT Fri Aug 14 2020/

UPDATE...
Weather forecast is on track through tonight based on current
observations and projected conditions for the first forecast period.
Expect another hot and dry day with high temperatures ranging from
100 to 106 degrees with heat index values up to 111 degrees. A Heat
Advisory is in effect across most areas through 7 PM this evening
and again on Saturday through 7 PM with the exception of the Rio
Grande area. With expected higher temperatures for Saturday, an
Excessive Heat Warning may be needed for some locations. We will be
coordinating on this effort with neighbor offices and bring you the
latest information during the afternoon forecast package.

PREV DISCUSSION... /ISSUED 606 AM CDT Fri Aug 14 2020/

AVIATION...
Patches of MVFR stratus have developed right along the I-35 corridor
from SAT to BAZ to HYI and AUS. Based on this have introduce TEMPO
BKN MVFR into the SAT/SSF and AUS TAFs for the next few hours (until
15z). Otherwise expect the generally VFR skies to continue. Winds
have decreased overnight, but should pick up again out of the south
and southwest by the late morning hours today. While breezy
conditions are possible across all of South Central Texas, DRT should
see the most gusts through the day.

PREV DISCUSSION... /ISSUED 303 AM CDT Fri Aug 14 2020/

SHORT TERM (Today through Saturday)...
Upper level high pressure is currently centered across New Mexico,
extending from Arizona to Texas. Surface high pressure continues to
dominate the Gulf of Mexico with our winds more out of the south and
southwest, rather than southeasterly off the Gulf. Looking at the
NAEFS the upper level ridge is decently strong (99th percentile at
500 mb), but what is significant and similar to our last heat wave
earlier this summer is the 700mb and 850 mb temperatures, which are
currently forecast to be between the 99.5 percentile and max
observed across the state, especially on Saturday.

The strong upper level ridge will translate to continued hot and dry
weather through Saturday. While no records were broken on Thursday,
record highs at most of our climate sites are in jeopardy on Friday,
with records at all of the sites likely in danger on Saturday. Based
on the forecast highs/heat indices no changes will be made at this
time to the ongoing heat advisory which will include most of the
area, with the exception of the Rio Grande Plains, beginning this
afternoon (criteria for the Rio Grande Plains is 110 for either
ambient temperature or heat index which is not forecast to be met at
this time). Under mostly sunny skies today and tomorrow the hottest
temperatures will center around the I-35 corridor, the Coastal
Plains, and Rio Grande Plains, with the Hill Country and Edwards
Plateau slightly cooler. Highs in these areas both days will come
close to or exceed the 103 ambient temperature criteria, with heat
index values for Saturday expected to exceed the 108 degree criteria.
There may also be a few spots that flirt with the criteria for an
excessive heat warning on Saturday as well. Will let the afternoon
forecast package address any changes to the heat headlines.
Subsidence from the upper level and surface ridges will squash any
chance for precipitation. One important item of note is that the heat
and continued dry conditions have led to fuels drying out across
South Central Texas. Coupled with the breezy south and southwest
winds each afternoon there has been an uptick in grass fires across
the area. Be mindful of the increased risk of grass fires. Overnight
lows tonight into Saturday will run in the mid to upper 70s.

CLIMATE...
Record High Temperatures and year of most recent occurrence
                       8/14        8/15
                    ----------  ---------
Austin Bergstrom    104 (1956)  104 (1956)
Austin Camp Mabry   107 (2013)  105 (2011)
San Antonio         103 (2013)  102 (2013)
Del Rio             106 (2015)  105 (2001)

LONG TERM (Saturday Night through Thursday)...
The portion of the Subtropical Ridge over Texas weakens going into
Sunday as an upper level trough deepens along or just east of the
Mississippi Valley while a weak cold front lingers over
northwestern Texas. The thermal ridge remains over our area with
little change to the high temperatures on Sunday. The Heat Advisory
will likely be extended into Sunday and similar to Saturday, a few
spots may flirt with Excessive Heat criteria. Isolated to widely
scattered showers and thunderstorms should develop along the front
during the day and then move south into the Hill Country and our
Central Texas counties late in the afternoon or more likely in the
evening into overnight hours. The main threat from the storms will be
strong wind gusts.

The front and boundaries generated by the showers and thunderstorms
will push into South Central Texas by Monday and linger into Tuesday.
Heating and forcing by the front/boundaries will generate isolated to
widely scattered showers and thunderstorms on Monday into Tuesday.
Another source of forcing may be an MCV that forms and drifts south
into our area. The main threat from the storms will be strong wind
gusts. The thermal ridge drifts to the west and along with very weak
cold advection, allows for a slight "cool" down of high temperatures.
However, models have trended warmer keeping high temperatures above
normal for early in the week.

The northerly flow continues over our area advecting drier air aloft
for Wednesday into Thursday while the front and boundaries dissipate.
As a result, the models have trended drier with only the seabreeze
generating any isolated showers and thunderstorms near the Coastal
Plains. Similar to early in the week, forecast high temperatures have
trended warmer, staying above normal. Strong mixing should allow for
much lower afternoon heat index values.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              79 104  78 105  77 /   0  -   -   10  20
Austin Bergstrom Intl Airport  77 103  76 104  76 /   0  -   -   10  20
New Braunfels Muni Airport     76 103  76 105  76 /   0   0  -   10  20
Burnet Muni Airport            76 105  76 102  75 /   0  -   10  20  30
Del Rio Intl Airport           77 107  78 106  79 /   0  -   -   10  10
Georgetown Muni Airport        79 106  78 105  77 /   0  -   -   10  30
Hondo Muni Airport             75 105  76 105  76 /   0  -   -   10  10
San Marcos Muni Airport        77 103  76 104  76 /   0   0  -   10  20
La Grange - Fayette Regional   79 104  77 105  77 /   0  -   -   10  20
San Antonio Intl Airport       78 104  78 105  77 /   0   0  -   10  10
Stinson Muni Airport           77 103  76 104  77 /   0   0  -   10  10

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
Heat Advisory until 7 PM CDT Saturday for Atascosa-Bastrop-Bexar-
Caldwell-Comal-De Witt-Fayette-Gonzales-Guadalupe-Hays-Karnes-
Lavaca-Lee-Travis-Williamson-Wilson.

Heat Advisory until 7 PM CDT Saturday for Bandera-Blanco-Burnet-
Edwards-Frio-Gillespie-Kendall-Kerr-Llano-Medina-Real-Uvalde.

&&

Short-Term/Aviation...17
Long-Term...Runyen
Decision Support...Oaks

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
318 AM CDT Fri Aug 14 2020

TXZ171>173-183>194-202>209-217>225-228-150830-
Llano-Burnet-Williamson-Val Verde-Edwards-Real-Kerr-Bandera-
Gillespie-Kendall-Blanco-Hays-Travis-Bastrop-Lee-Kinney-Uvalde-
Medina-Bexar-Comal-Guadalupe-Caldwell-Fayette-Maverick-Zavala-
Frio-Atascosa-Wilson-Karnes-Gonzales-De Witt-Lavaca-Dimmit-
318 AM CDT Fri Aug 14 2020

This Hazardous Weather Outlook is for South-Central Texas..

.DAY ONE...Today And Tonight.

The Heat Advisory expands this afternoon to include most of South
Central Texas, with the exception of the Rio Grande Plains.
Afternoon highs today will range from 103 to 106 across most
areas, with afternoon heat indices reaching 108 to 110 degrees.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

The Heat Advisory will continue through at least Saturday evening
with afternoon highs even warmer on Saturday with most areas of
South Central Texas seeing highs 104 to 107, with afternoon heat
index values rising to near 111.

.SPOTTER INFORMATION STATEMENT...

Spotter activation is not anticipated.