Alert archive / Texas / Tornado Watches in 2020

Tornado Watch 403

July 26, 202014 counties in Texas

The Storm Prediction Center issued this tornado watch at Jul 26, 2020, 7:51 AM CDT for 14 counties in Texas. It was in force for 14 hr.

The area

The outline as issued.

The facts

Issued
Jul 26, 2020, 7:51 AM CDT (12:51 UTC)
Expired
Jul 26, 2020, 10:00 PM CDT
In force
14 hr
Issued by
the Storm Prediction Center
Strongest gust expected
60 kt

Counties Brooks County, TX, Cameron County, TX, Duval County, TX, Hidalgo County, TX, Jim Hogg County, TX, Jim Wells County, TX, Kenedy County, TX, Kleberg County, TX, Nueces County, TX, San Patricio County, TX, Starr County, TX, Webb County, TX, Willacy County, TX, Zapata County, TX

The radar

The Corpus Christi radar (KCRP), 139 km from the middle of the area, began a volume at 12:55 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 SPC expected

The probabilities SPC published with the watch, for the watch area over its life.

Two or more tornadoes
40%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
10%
One or more gusts of 65 knots or more
5%
Ten or more severe hail reports
5%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
20%

Warnings issued inside it

19 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.

IssuedProductOfficeCountiesLasted
Jul 26, 9:02 AM CDTTornado WarningBROHidalgo13 min
Jul 26, 10:04 AM CDTFlash Flood Warning EmergencyCatastrophic damage threatBROCameron, Hidalgo9 hr
Jul 26, 10:14 AM CDTFlash Flood Warning Considerable damage threatBROCameron, Hidalgo, Willacy6 hr
Jul 26, 10:38 AM CDTTornado WarningCRPDuval, Jim Wells22 min
Jul 26, 10:44 AM CDTFlash Flood Warning Considerable damage threatBROBrooks, Cameron, Hidalgo, Jim Hogg, Starr, Willacy4 hr
Jul 26, 11:00 AM CDTTornado WarningCRPDuval15 min
Jul 26, 11:25 AM CDTTornado WarningBROHidalgo11 min
Jul 26, 12:29 PM CDTTornado WarningCRPJim Wells31 min
Jul 26, 12:30 PM CDTTornado WarningBROKenedy, Willacy45 min
Jul 26, 12:39 PM CDTTornado WarningCRPDuval, Jim Wells36 min
Jul 26, 12:47 PM CDTTornado WarningBROBrooks, Kenedy28 min
Jul 26, 1:04 PM CDTTornado WarningBROBrooks26 min
Jul 26, 1:16 PM CDTTornado WarningCRPDuval, Jim Wells29 min
Jul 26, 1:42 PM CDTTornado WarningCRPDuval, Jim Wells33 min
Jul 26, 2:16 PM CDTFlash Flood Warning Considerable damage threatBROHidalgo, Starr9 hr
Jul 26, 3:03 PM CDTTornado WarningCRPDuval, Jim Wells, Live Oak, McMullen21 min
Jul 26, 5:38 PM CDTFlash Flood WarningBROHidalgo, Jim Hogg, Starr5 hr
Jul 26, 6:58 PM CDTFlash Flood Warning Considerable damage threatBROCameron, Hidalgo5 hr
Jul 26, 7:35 PM CDTFlash Flood WarningBROJim Hogg, Zapata3 hr

Discussions around it

SPC mesoscale discussions over the same counties from four hours before the watch to its end.

The nearest sounding before it

Brownsville Intl, TX (KBRO), launched 12:00Z, 0.9 hours before the alert went out and 142 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-pSkew-T log-p diagram, Brownsville Intl, TX at 12:00Z on 2020-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 103 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Brownsville Intl, TX at 12:00Z on 2020-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -43 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
103 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
590 m above ground
0-6 km bulk shear
12 kt
0-1 km storm-relative helicity
-43 m²/s²
0-3 km storm-relative helicity
92 m²/s²
Significant tornado parameter
0.0
Supercell composite
-0.1

Open this sounding in Storm Lab

The text

As transmitted.

367 
WWUS20 KWNS 261245
SEL3  
SPC WW 261245
TXZ000-CWZ000-270300-

URGENT - IMMEDIATE BROADCAST REQUESTED
Tornado Watch Number 403
NWS Storm Prediction Center Norman OK
745 AM CDT Sun Jul 26 2020

The NWS Storm Prediction Center has issued a

* Tornado Watch for portions of 
  South Texas
  Coastal Waters

* Effective this Sunday morning and evening from 745 AM until
  1000 PM CDT.

* Primary threats include...
  A couple tornadoes possible

SUMMARY...The tornado threat will spread westward across affected
parts of south Texas through the afternoon, within the northeastern
sector of Tropical Storm Hanna, as the cyclone's center moves into
the higher terrain of Mexico.  Tornado potential should diminish
this evening with weakening of both environmental buoyancy and of
Hanna's overall wind fields.

The tornado watch area is approximately along and 70 statute miles
east and west of a line from 20 miles southeast of Mcallen TX to 35
miles northwest of Alice TX. For a complete depiction of the watch
see the associated watch outline update (WOUS64 KWNS WOU3).

PRECAUTIONARY/PREPAREDNESS ACTIONS...

REMEMBER...A Tornado Watch means conditions are favorable for
tornadoes and severe thunderstorms in and close to the watch
area. Persons in these areas should be on the lookout for
threatening weather conditions and listen for later statements
and possible warnings.

&&

OTHER WATCH INFORMATION...This tornado watch replaces tornado
watch number 402. Watch number 402 will not be in effect after
745 AM CDT. 

AVIATION...Tornadoes and a few severe thunderstorms with hail
surface and aloft to 0 inches. Extreme turbulence and surface wind
gusts to 60 knots. A few cumulonimbi with maximum tops to 550. Mean
storm motion vector 15040.

...Edwards

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Jul 25, 7:23 PM CDTMesoscale DiscussionSPCCameron, Kenedy, Kleberg, Nueces, Willacy5 hr
Jul 25, 11:05 PM CDTTornado WatchSPCBrooks, Cameron, Duval, Hidalgo, Jim Wells, Kenedy and 6 more9 hr
Jul 26, 3:23 AM CDTMesoscale DiscussionSPCBrooks, Cameron, Duval, Hidalgo, Jim Wells, Kenedy and 6 more2 hr
Jul 26, 6:45 AM CDTMesoscale DiscussionSPCAransas, Brooks, Cameron, Duval, Hidalgo, Jim Wells and 5 more90 min
Jul 26, 12:13 PM CDTMesoscale DiscussionSPCBrooks, Cameron, Duval, Hidalgo, Jim Hogg, Jim Wells and 5 more2 hr

Nearby

Tornado Watches in Texas, 2020Every tornado watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.