Alert archive / Texas / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 166, NWS Austin/San Antonio, TX

May 27, 2020Gillespie County, Kendall County, Kerr County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at May 27, 2020, 6:24 PM CDT for Gillespie County, Kendall County, Kerr County, Texas. It was in force for 66 min. 7 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued: May 27, 2020, 6:24 PM CDT (23:24 UTC)
Expired: May 27, 2020, 7:30 PM CDT
In force: 66 min
Issued by: NWS Austin/San Antonio, TX
Area: Storm-based polygon
Hail: 1.75 in
Wind: 60.0 mph

Counties Gillespie County, TX, Kendall County, TX, Kerr County, TX

The radar

The Austin/San Antonio radar (KEWX), 114 km from the middle of the area, began a volume at 23:28 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

Time	Report	Where	Remark
May 27, 6:40 PM CDT	TSTM WND GST 65	6 E Harper, TX	.
May 27, 6:40 PM CDT	TSTM WND GST 65	6 E Harper, TX
May 27, 6:43 PM CDT	HAIL 1.75	6 E Harper, TX
May 27, 6:58 PM CDT	HAIL 1.25	2 Nw Fredericksburg, TX	REPORT FROM MPING: HALF DOLLAR (1.25 IN.).
May 27, 7:14 PM CDT	HAIL 1.25	5 Wnw Bankersmith, TX
May 27, 7:25 PM CDT	TSTM WND GST 80	8 Sw Fredericksburg, TX	.
May 27, 7:25 PM CDT	TSTM WND GST 80	8 Sw Fredericksburg, TX

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 7 storm reports to this severe thunderstorm warning; the first came 16 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
May 27, 1:24 PM CDT	Severe Thunderstorm Watch	SPC	9 hr
May 27, 5:23 PM CDT	Severe Thunderstorm Watch	SPC	8 hr

The nearest sounding before it

Del Rio, TX (KDRT), launched 12:00Z, 11.4 hours before the alert went out and 206 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 994 J/kg
Mixed-layer CIN: -202 J/kg
Mixed-layer LCL: 1162 m above ground
0-6 km bulk shear: 54 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: 95 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.3

Open this sounding in Storm Lab

The text

As transmitted.

381 
WUUS54 KEWX 272324
SVREWX
TXC171-259-265-280030-
/O.NEW.KEWX.SV.W.0166.200527T2324Z-200528T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Austin/San Antonio TX
624 PM CDT Wed May 27 2020

The National Weather Service in Austin San Antonio has issued a

* Severe Thunderstorm Warning for...
  Northeastern Kerr County in south central Texas...
  Gillespie County in south central Texas...
  Northwestern Kendall County in south central Texas...

* Until 730 PM CDT.

* At 624 PM CDT, a severe thunderstorm was located near Doss, or 21
  miles northwest of Fredericksburg, moving southeast at 35 mph.

  HAZARD...Golf ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* Locations impacted include...
  Kerrville, Fredericksburg, Comfort, Stonewall, Cherry Spring,
  Luckenbach, Cain City, Tivydale, Old Tunnel State Park, Doss, Rocky
  Hill, LBJ State Park, Harper, Bankersmith, Cypress Creek,
  Blumenthal, Center Point, Albert, Grapetown and LBJ National
  Historical Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3050 9892 3023 9859 3019 9859 2987 9902
      3029 9931 3029 9930 3050 9931
TIME...MOT...LOC 2324Z 319DEG 32KT 3041 9919 

HAIL...1.75IN
WIND...60MPH
 
$$

RUNYEN

2 follow-up statements

426 
WWUS54 KEWX 272339
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
639 PM CDT Wed May 27 2020

TXC171-259-265-280030-
/O.CON.KEWX.SV.W.0166.000000T0000Z-200528T0030Z/
Kerr TX-Gillespie TX-Kendall TX-
639 PM CDT Wed May 27 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR NORTHEASTERN KERR...GILLESPIE AND NORTHWESTERN KENDALL
COUNTIES...

At 638 PM CDT, a severe thunderstorm was located near Tivydale, or 15
miles west of Fredericksburg, moving southeast at 35 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
Kerrville, Fredericksburg, Comfort, Stonewall, Cherry Spring,
Luckenbach, Cain City, Tivydale, Old Tunnel State Park, Doss, Rocky
Hill, LBJ State Park, Harper, Bankersmith, Cypress Creek, Blumenthal,
Center Point, Albert, Grapetown and LBJ National Historical Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3050 9892 3023 9859 3019 9859 2987 9902
      3029 9931 3029 9930 3050 9931
TIME...MOT...LOC 2338Z 320DEG 30KT 3033 9912 

HAIL...2.00IN
WIND...60MPH
 
$$

RUNYEN

283 
WWUS54 KEWX 272347
SVSEWX

Severe Weather Statement
National Weather Service Austin/San Antonio TX
647 PM CDT Wed May 27 2020

TXC171-259-265-280030-
/O.CON.KEWX.SV.W.0166.000000T0000Z-200528T0030Z/
Kerr TX-Gillespie TX-Kendall TX-
647 PM CDT Wed May 27 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR NORTHEASTERN KERR...GILLESPIE AND NORTHWESTERN KENDALL
COUNTIES...

At 647 PM CDT, a severe thunderstorm was located near Tivydale, or 9
miles west of Fredericksburg, moving southeast at 40 mph.

This is a very dangerous storm.

HAZARD...Baseball size hail and 70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be severely injured. 
         Expect shattered windows, extensive damage to roofs, 
         siding, and vehicles.

Locations impacted include...
Kerrville, Fredericksburg, Comfort, Stonewall, Cherry Spring,
Luckenbach, Cain City, Tivydale, Old Tunnel State Park, Doss, Rocky
Hill, LBJ State Park, Harper, Bankersmith, Cypress Creek, Blumenthal,
Center Point, Albert, Grapetown and LBJ National Historical Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.

Continuous cloud to ground lightning is occurring with this storm.
Move indoors immediately. Lightning is one of nature's leading
killers. Remember, if you can hear thunder, you are close enough to
be struck by lightning.

&&

LAT...LON 3050 9892 3023 9859 3019 9859 2987 9902
      3029 9931 3029 9930 3050 9931
TIME...MOT...LOC 2347Z 315DEG 34KT 3027 9904 

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...70MPH
 
$$

RUNYEN

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Austin/San Antonio, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at May 27, 2:27 PM CDT, 3 hours 57 minutes earlier.

Area forecast discussion, May 27, 2:27 PM CDT, 3 hours 57 minutes before

Area Forecast Discussion
National Weather Service Austin/San Antonio TX
227 PM CDT Wed May 27 2020

.SHORT TERM (Tonight through Thursday Night)...
Today brings yet another round for thunderstorms this afternoon and
evening for some. A cut off deepening low located on the eastern
border of Oklahoma today will leave the area under broad
northwesterly flow aloft. Low level flow becomes more southeasterly
over the next few hours further increasing deep layer shear, values
over 65kt, supporting healthy updrafts over an already unstable
environment. CAPE values across our northeastern counties range from
2500-3500J/kg with weak CIN. Ongoing severe storms to our north have
shown that any initiation will happen relatively quickly. The Storm
Prediction Center has the area under an enhanced risk northeast of a
line from Kerrville to New Braunfels to Schulenburg. This risk
includes very large hail, damaging winds in excess of 70mph and a
small risk for tornadoes. There is expected to be multiple rounds of
storms for this area, the first being triggered by an active outflow
boundary from storms to our north. Later this evening, individual
discrete cells pose a threat for very large hail up to 3 inches, as
lapse rates are quite steep, upwards of 7.5C/km. Tornadoes are
possible, though the threat is lower due to the weak low level shear,
and relatively dry boundary layer. As the evening progresses and
cells congeal, the threat becomes more focused on damaging wind up to
70mph.

Considering the wet pattern that this area has been over the past
several days, the threat of flash flooding should not be overlooked
through the chatter of severe weather. Austin in particular has had
measurable precip everyday for the past 6 days, totaling over 2
inches. If cells begin to train, or MCS slows over the metro area, or
any area for that matter, flash flooding may occur. WPC has
highlighted the northeastern counties in a marginal threat for
excessive rainfall. This means, that the highlighted area has a 5-10
percent chance of rainfall exceeding the flash flood guidance within
25 miles of a point. Stay weather aware, and Turn Around Don't
Drown.

Tomorrow should be relatively quiet with residual showers in the
coastal plains during the morning and early afternoon. Highs will be
slightly cooler than today, reaching the mid to upper 80s. By
tomorrow night, rain chances shift back out west with higher POPs
over the Rio Grande Plains. The entire region is under a marginal
risk for severe storms.

&&

.LONG TERM (Friday through Wednesday)...
After an extended period of active weather, mid to upper level
ridging builds in by Friday and will continue through the weekend and
into next week. While a few isolated locations could see a stray
shower or thunderstorm during this period, by and large the region
should stay dry. Temperatures Friday through Monday will track
closely to seasonal normals with temperatures increasing a couple
degrees for Tuesday and Wednesday of next week.

&&

.PRELIMINARY POINT TEMPS/POPS...
Austin Camp Mabry              65  85  67  87  65 /  80  20  10  -    0
Austin Bergstrom Intl Airport  63  84  66  87  65 /  80  30  10  -    0
New Braunfels Muni Airport     66  85  67  88  65 /  60  20  10  -    0
Burnet Muni Airport            63  83  64  84  62 /  80  10  10  -    0
Del Rio Intl Airport           71  91  70  92  68 /  -   10  40  10   0
Georgetown Muni Airport        64  83  66  86  63 /  90  20  10  -    0
Hondo Muni Airport             68  89  68  92  65 /  20  10  30  10   0
San Marcos Muni Airport        64  84  66  88  64 /  70  20  10  -    0
La Grange - Fayette Regional   66  84  67  87  66 /  50  30  10  10  -
San Antonio Intl Airport       68  87  69  90  67 /  30  10  20  10   0
Stinson Muni Airport           70  89  70  90  67 /  20  10  20  10   0

&&

.EWX WATCHES/WARNINGS/ADVISORIES...
None.
&&

Short-Term/Aviation...YBVP
Long-Term...BMW
Decision Support...Hampshire

Hazardous weather outlook, May 27, 4:53 AM CDT, 13 hours 31 minutes before

Hazardous Weather Outlook
National Weather Service Austin/San Antonio TX
453 AM CDT Wed May 27 2020

TXZ171>173-183>194-202>209-217>225-228-281000-
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-
453 AM CDT Wed May 27 2020

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

.DAY ONE...Today And Tonight.

Scattered severe thunderstorms are possible this afternoon and
evening for the eastern two-thirds of the area, primarily for
locations along and east of a Juno to Uvalde to Pearsall
line. An Enhanced Risk For Severe Thunderstorms exists along and
east of Kerrville to New Braunfels to Schulenburg line. Very
large hail, significant damaging wind gusts, and an isolated
tornado or two will all be possible. Locally heavy rainfall and
flash flooding is also possible.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday.

No hazardous weather expected for the extended forecast period at
this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this afternoon and evening.

In the hours before

Local storm report, May 27, 5:05 PM CDT, 1 hour 19 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
505 PM CDT WED MAY 27 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0430 PM     HAIL             10 NE SPICEWOOD         30.59N 98.06W
05/27/2020  E0.88 INCH       TRAVIS             TX   PUBLIC

            TWITTER PICTURE.

&&

HAMPSHIRE

Special weather statement, May 27, 5:12 PM CDT, 1 hour 12 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
512 PM CDT Wed May 27 2020

TXZ171-172-272245-
Llano TX-Burnet TX-
512 PM CDT Wed May 27 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHEASTERN LLANO AND
NORTHWESTERN BURNET COUNTIES UNTIL 545 PM CDT...

At 511 PM CDT, Doppler radar was tracking a strong thunderstorm near
Bluffton, or near Buchanan Dam, moving east at 15 mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Burnet, Buchanan Dam, Buchanan Lake Village, Inks Lake State Park,
Bluffton and Tow.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
south central Texas.

LAT...LON 3072 9849 3087 9851 3094 9826 3070 9823
TIME...MOT...LOC 2211Z 263DEG 12KT 3080 9845

RUNYEN

Local storm report, May 27, 5:25 PM CDT, 59 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
525 PM CDT WED MAY 27 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0525 PM     HAIL             1 ENE BUCHANAN LAKE VIL 30.86N 98.44W
05/27/2020  E0.88 INCH       LLANO              TX   PUBLIC

&&

HAMPSHIRE

Special weather statement, May 27, 5:45 PM CDT, 39 minutes before

Special Weather Statement
National Weather Service Austin/San Antonio TX
545 PM CDT Wed May 27 2020

TXZ172-272330-
Burnet TX-
545 PM CDT Wed May 27 2020

...SIGNIFICANT WEATHER ADVISORY FOR NORTHERN BURNET COUNTY UNTIL 630
PM CDT...

At 545 PM CDT, Doppler radar was tracking a strong thunderstorm near
Lake Victor, or near Burnet, moving east at 20 mph.

Nickel size hail will be possible with this storm.

Locations impacted include...
Burnet, Lake Victor, Joppa, Watson, Sunnylane and Shady Grove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

A Severe Thunderstorm Watch remains in effect until midnight CDT for
south central Texas.

LAT...LON 3080 9795 3076 9798 3074 9832 3091 9836
      3103 9801
TIME...MOT...LOC 2245Z 258DEG 19KT 3085 9826

RUNYEN

Local storm report, May 27, 6:11 PM CDT, 13 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
611 PM CDT WED MAY 27 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0608 PM     HAIL             3 NW BRIGGS             30.92N 97.95W
05/27/2020  E1.50 INCH       BURNET             TX   TRAINED SPOTTER

&&

HAMPSHIRE

Local storm report, May 27, 6:22 PM CDT, 2 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN/SAN ANTONIO TX
622 PM CDT WED MAY 27 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0616 PM     HAIL             4 S BURNET              30.70N 98.25W
05/27/2020  U0.75 INCH       BURNET             TX   PUBLIC

            REPORT FROM MPING: DIME (0.75 IN.).

&&

HAMPSHIRE

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 27, 1:57 PM CDT	Special Weather Statement	EWX	Williamson	48 min
May 27, 4:28 PM CDT	Special Weather Statement	EWX	Burnet	32 min
May 27, 4:59 PM CDT	Special Weather Statement	EWX	Williamson	31 min
May 27, 5:12 PM CDT	Special Weather Statement	EWX	Burnet	33 min
May 27, 5:14 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	30 min
May 27, 5:45 PM CDT	Special Weather Statement	EWX	Burnet	45 min
May 27, 5:48 PM CDT	Severe Thunderstorm Warning	EWX	Gillespie, Llano	42 min
May 27, 5:53 PM CDT	Severe Thunderstorm Warning	EWX	Burnet, Llano	67 min
May 27, 6:44 PM CDT	Severe Thunderstorm Warning	EWX	Blanco, Burnet, Hays, Llano, Travis, Williamson	24 min

Nearby

Severe Thunderstorm Warnings in Texas, 2020 Every severe thunderstorm warning in 2020

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.