Alert archive / Texas / Severe Thunderstorm Watches in 2016

Severe Thunderstorm Watch 222

May 27, 201622 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at May 27, 2016, 2:38 AM CDT for 22 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
May 27, 2016, 2:38 AM CDT (07:38 UTC)
Expired
May 27, 2016, 7:20 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 22 counties

Austin County, TX, Brazoria County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Grimes County, TX, Hardin County, TX, Harris County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Montgomery County, TX, Newton County, TX, Orange County, TX, Polk County, TX, San Jacinto County, TX, Tyler County, TX, Walker County, TX, Waller County, TX, Washington County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 72 km from the middle of the area, began a volume at 07:40 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
20%
One or more EF2 to EF5 tornadoes
10%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
10%
Ten or more severe hail reports
20%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
70%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 27, 2:54 AM CDTSevere Thunderstorm WarningHGXAustin, Brazos, Burleson, Grimes, Waller, Washington66 min
May 27, 2:58 AM CDTTornado WarningHGXChambers, Harris12 min
May 27, 3:28 AM CDTSevere Thunderstorm WarningHGXAustin, Brazos, Burleson, Colorado, Grimes, Harris and 3 more47 min
May 27, 3:33 AM CDTFlash Flood WarningHGXSan Jacinto, Trinity, Walker5 hr
May 27, 4:08 AM CDTSevere Thunderstorm WarningHGXAustin, Grimes, Harris, Liberty, Montgomery, San Jacinto and 2 more67 min

Discussions around it

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

The nearest sounding before it

Lake Charles Mun, LA (KLCH), launched 00:00Z, 7.6 hours before the alert went out and 245 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, Lake Charles Mun, LA at 00:00Z on 2016-05-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1364 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, Lake Charles Mun, LA at 00:00Z on 2016-05-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 32 square meters per square second.19395878Sfc1 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
1364 J/kg
Mixed-layer CIN
-2 J/kg
Mixed-layer LCL
680 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
32 m²/s²
0-3 km storm-relative helicity
18 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.5

Open this sounding in Storm Lab

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 26, 7:33 PM CDTSevere Thunderstorm WatchSPCBosque, Comanche, Dallas, Eastland, Ellis, Erath and 12 more5 hr
May 26, 7:46 PM CDTMesoscale DiscussionSPCFoard, Hardeman, Wichita, Wilbarger59 min
May 26, 9:14 PM CDTMesoscale DiscussionSPCArcher, Bandera, Baylor, Brown, Burnet, Callahan and 47 more61 min
May 26, 10:04 PM CDTMesoscale DiscussionSPCBastrop, Bexar, Blanco, Caldwell, Comal, Fayette and 6 more56 min
May 26, 10:17 PM CDTSevere Thunderstorm WatchSPCBandera, Bastrop, Blanco, Burnet, Caldwell, Comal and 9 more6 hr
May 26, 11:06 PM CDTMesoscale DiscussionSPCCoryell, Dallas, Ellis, Hill, McLennan84 min
May 27, 1:30 AM CDTMesoscale DiscussionSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 9 more60 min
May 27, 2:14 AM CDTMesoscale DiscussionSPCAustin, Chambers, Colorado, Fayette, Fort Bend, Harris and 4 more61 min
May 27, 5:50 AM CDTMesoscale DiscussionSPCChambers, Hardin, Jasper, Jefferson, Newton, Orange and 1 more25 min
May 27, 12:57 PM CDTMesoscale DiscussionSPCAngelina, Austin, Bastrop, Brazoria, Caldwell, Chambers and 28 more63 min
May 27, 2:04 PM CDTSevere Thunderstorm WatchSPCChambers, Hardin, Jasper, Jefferson, Liberty, Newton and 3 more6 hr
May 27, 4:03 PM CDTMesoscale DiscussionSPCAustin, Bee, Brazoria, Calhoun, Chambers, Colorado and 27 more117 min

Nearby

Severe Thunderstorm Watches in Texas, 2016Every severe thunderstorm watch in 2016

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.