Alert archive / Texas / Tornado Watches in 2015

Tornado Watch 216

May 25, 20159 parishes in Louisiana; 24 counties in Texas

The Storm Prediction Center issued this tornado watch at May 25, 2015, 6:24 PM CDT for 9 parishes in Louisiana; 24 counties in Texas. It was in force for 9 hr.

The area

The outline as issued.

The facts

Issued
May 25, 2015, 6:24 PM CDT (23:24 UTC)
Expired
May 26, 2015, 3:00 AM CDT
In force
9 hr
Issued by
the Storm Prediction Center
Largest hail expected
1.5 in
Strongest gust expected
60 kt
All 33 counties

Acadia Parish, LA, Allen Parish, LA, Beauregard Parish, LA, Calcasieu Parish, LA, Cameron Parish, LA, Evangeline Parish, LA, Jefferson Davis Parish, LA, Rapides Parish, LA, Vernon Parish, LA, Austin County, TX, Bee County, TX, Brazoria County, TX, Calhoun County, TX, Chambers County, TX, Colorado County, TX, Fort Bend County, TX, Galveston County, TX, Goliad County, TX, Hardin County, TX, Harris County, TX, Jackson County, TX, Jasper County, TX, Jefferson County, TX, Liberty County, TX, Live Oak County, TX, Matagorda County, TX, Newton County, TX, Orange County, TX, Refugio County, TX, Tyler County, TX, Victoria County, TX, Waller County, TX, Wharton County, TX

The radar

The Houston radar (KHGX), 67 km from the middle of the area, began a volume at 23:26 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
50%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
70%
One or more gusts of 65 knots or more
20%
Ten or more severe hail reports
30%
One or more hailstones of 2 inches or more
10%
Six or more combined severe hail and wind reports
95%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 25, 6:51 PM CDTTornado WarningHGXAustin, Colorado, Washington24 min
May 25, 7:09 PM CDTFlash Flood WarningHGXAustin, Brazos, Burleson, Colorado, Grimes, Waller and 1 more6 hr
May 25, 7:11 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Waller, Washington49 min
May 25, 7:43 PM CDTSevere Thunderstorm WarningHGXAustin, Grimes, Harris, Montgomery, Walker, Waller and 1 more62 min
May 25, 7:50 PM CDTTornado WarningHGXGrimes, Harris, Montgomery, Walker, Waller25 min
May 25, 7:58 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Waller, Washington47 min
May 25, 8:10 PM CDTSevere Thunderstorm WarningHGXLiberty, Montgomery, Polk, San Jacinto, Trinity35 min
May 25, 8:26 PM CDTSevere Thunderstorm WarningLCHTyler64 min
May 25, 8:31 PM CDTFlash Flood WarningHGXHarris, Montgomery, San Jacinto, Walker3 hr
May 25, 8:32 PM CDTSevere Thunderstorm WarningLCHHardin28 min
May 25, 8:35 PM CDTFlash Flood WarningHGXAustin, Colorado, Grimes, Harris, Montgomery, Waller3 hr
May 25, 8:36 PM CDTFlash Flood WarningLCHHardin, Tyler3 hr
May 25, 8:41 PM CDTSevere Thunderstorm WarningHGXFort Bend, Harris, Liberty, Montgomery, San Jacinto, Waller64 min
May 25, 8:45 PM CDTSevere Thunderstorm WarningHGXFort Bend, Harris30 min
May 25, 8:54 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Harris, Montgomery, San Jacinto3 hr
May 25, 8:55 PM CDTSevere Thunderstorm WarningLCHHardin65 min
May 25, 9:06 PM CDTSevere Thunderstorm WarningLCHJasper, Newton54 min
May 25, 9:09 PM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Fort Bend, Waller, Washington, Wharton51 min
May 25, 9:09 PM CDTFlash Flood WarningLCHJasper, Newton3 hr
May 25, 9:11 PM CDTFlash Flood WarningHGXChambers, Harris, Liberty, Montgomery, Polk, San Jacinto3 hr
May 25, 9:13 PM CDTSevere Thunderstorm WarningHGXFort Bend, Harris47 min
May 25, 9:17 PM CDTTornado WarningCRPLive Oak, McMullen28 min
May 25, 9:27 PM CDTTornado WarningLCHJasper, Tyler22 min
May 25, 9:28 PM CDTSevere Thunderstorm WarningCRPBee, Goliad47 min
May 25, 9:34 PM CDTTornado WarningLCHTyler14 min
May 25, 9:41 PM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Harris, Waller64 min
May 25, 9:41 PM CDTTornado WarningLCHNewton9 min
May 25, 9:44 PM CDTSevere Thunderstorm WarningLCHBeauregard, Vernon31 min
May 25, 9:46 PM CDTTornado WarningCRPLive Oak17 min
May 25, 9:47 PM CDTFlash Flood WarningLCHBeauregard, Calcasieu, Vernon3 hr
May 25, 9:52 PM CDTTornado WarningLCHBeauregard23 min
May 25, 9:55 PM CDTSevere Thunderstorm WarningCRPLive Oak50 min
May 25, 10:08 PM CDTTornado WarningCRPGoliad, Victoria37 min
May 25, 10:17 PM CDTTornado WarningCRPBee, Live Oak28 min
May 25, 10:19 PM CDTSevere Thunderstorm WarningLCHBeauregard, Calcasieu, Rapides, Vernon56 min
May 25, 10:20 PM CDTFlash Flood WarningCRPBee, Live Oak3 hr
May 25, 10:31 PM CDTFlash Flood WarningLCHCalcasieu4 hr
May 25, 10:40 PM CDTTornado WarningCRPBee, Live Oak35 min
May 25, 10:43 PM CDTSevere Thunderstorm WarningCRPGoliad, Victoria47 min
May 25, 10:45 PM CDTSevere Thunderstorm WarningCRPLive Oak26 min
May 25, 10:52 PM CDTFlash Flood Warning EmergencyHGXFort Bend, Harris113 min
May 25, 10:55 PM CDTFlash Flood WarningCRPGoliad, Victoria3 hr
May 25, 10:59 PM CDTSevere Thunderstorm WarningLCHAllen, Beauregard, Calcasieu, Evangeline, Jefferson Davis, Rapides31 min
May 25, 11:08 PM CDTSevere Thunderstorm WarningCRPBee37 min
May 25, 11:11 PM CDTFlash Flood WarningHGXAustin, Colorado, Fort Bend, Waller, Wharton2 hr
May 25, 11:22 PM CDTFlash Flood WarningLCHHardin, Tyler3 hr
May 25, 11:29 PM CDTSevere Thunderstorm WarningLCHAcadia, Allen, Avoyelles, Beauregard, Calcasieu, Cameron and 4 more91 min
May 25, 11:31 PM CDTSevere Thunderstorm WarningCRPBee, Goliad, Refugio44 min
May 25, 11:40 PM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Galveston, Harris3 hr
May 25, 11:45 PM CDTSevere Thunderstorm WarningHGXJackson45 min
May 26, 12:11 AM CDTFlash Flood WarningLCHJasper, Newton2 hr
May 26, 12:35 AM CDTFlash Flood Warning EmergencyHGXFort Bend, Harris115 min
May 26, 12:36 AM CDTFlash Flood WarningHGXBrazoria, Fort Bend, Jackson, Matagorda, Wharton3 hr
May 26, 12:58 AM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Matagorda, Wharton47 min
May 26, 1:25 AM CDTFlash Flood WarningHGXFort Bend, Wharton95 min
May 26, 1:41 AM CDTSevere Thunderstorm WarningHGXBrazoria, Fort Bend, Galveston, Harris49 min
May 26, 2:21 AM CDTFlash Flood Warning EmergencyHGXFort Bend, Harris114 min
May 26, 2:28 AM CDTSevere Thunderstorm WarningHGXFort Bend, Wharton47 min
May 26, 2:30 AM CDTFlash Flood Warning EmergencyHGXBrazoria, Chambers, Fort Bend, Galveston, Harris, Liberty and 2 more3 hr
May 26, 2:31 AM CDTFlash Flood WarningLCHCalcasieu, Cameron3 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

Lake Charles Mun, LA (KLCH), launched 12:00Z, 11.4 hours before the alert went out and 249 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 12:00Z on 2015-05-25Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 983 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 12:00Z on 2015-05-25The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 120 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
983 J/kg
Mixed-layer CIN
-106 J/kg
Mixed-layer LCL
977 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
120 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.2
Supercell composite
3.6

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

350 
WWUS20 KWNS 252321
SEL6  
SPC WW 252321
LAZ000-TXZ000-CWZ000-260700-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 216
NWS STORM PREDICTION CENTER NORMAN OK
620 PM CDT MON MAY 25 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  SOUTHERN LOUISIANA
  THE TEXAS GULF COASTAL PLAIN
  COASTAL WATERS

* EFFECTIVE THIS MONDAY NIGHT AND TUESDAY MORNING FROM 620 PM
  UNTIL 200 AM CDT.

* PRIMARY THREATS INCLUDE...
  A FEW TORNADOES POSSIBLE
  SCATTERED DAMAGING WIND GUSTS TO 70 MPH LIKELY
  ISOLATED LARGE HAIL EVENTS TO 1.5 INCHES IN DIAMETER POSSIBLE

SUMMARY...SQUALL LINE NOW MOVING TOWARD THE TX GULF COASTAL PLAIN
EXPECTED TO CONTINUE GENERALLY E THROUGH LATE TONIGHT...WITH SOME
SOUTHWARD DEVELOPMENT POSSIBLE OVER TIME.  MORE ISOLATED STORMS MAY
FORM IN THE VERY  MOIST LOW-LEVEL FLOW AHEAD OF THE LINE.  THE
STORMS WILL BE CAPABLE OF DAMAGING WIND AND POSSIBLY A FEW
TORNADOES...IN ADDITION TO A FEW INSTANCES OF SEVERE HAIL.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 100 STATUTE
MILES EAST AND WEST OF A LINE FROM 30 MILES SOUTH SOUTHEAST OF
VICTORIA TEXAS TO 35 MILES NORTH NORTHWEST OF FORT POLK
LOUISIANA.  FOR A COMPLETE DEPICTION OF THE WATCH SEE THE
ASSOCIATED WATCH OUTLINE UPDATE (WOUS64 KWNS WOU6).

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...CONTINUE...WW 212...WW 213...WW
214...WW 215...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 60 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
600. MEAN STORM MOTION VECTOR 25035.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 24, 7:42 PM CDTMesoscale DiscussionSPCAscension, Assumption, East Baton Rouge, East Feliciana, Iberville, Jefferson and 18 more93 min
May 25, 2:38 AM CDTMesoscale DiscussionSPCOrleans, Saint Tammany, Washington3 hr
May 25, 5:15 PM CDTMesoscale DiscussionSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more90 min
May 25, 5:51 PM CDTTornado WatchSPCBienville, Bossier, Caddo, Caldwell, Claiborne, De Soto and 11 more6 hr
May 25, 6:06 PM CDTMesoscale DiscussionSPCAllen, Beauregard, Calcasieu, Cameron54 min
May 24, 7:57 PM CDTMesoscale DiscussionSPCHemphill, Lipscomb, Ochiltree, Roberts93 min
May 24, 8:24 PM CDTTornado WatchSPCHansford, Lipscomb, Ochiltree5 hr
May 25, 3:17 AM CDTMesoscale DiscussionSPCBandera, Coke, Crane, Crockett, Ector, Edwards and 21 more4 hr
May 25, 6:45 AM CDTSevere Thunderstorm WatchSPCAndrews, Borden, Brown, Callahan, Coke, Coleman and 34 more6 hr
May 25, 6:50 AM CDTMesoscale DiscussionSPCAndrews, Borden, Callahan, Coke, Coleman, Crosby and 26 more55 min
May 25, 7:53 AM CDTMesoscale DiscussionSPCBandera, Bexar, Blanco, Burnet, Comal, Frio and 8 more2 hr
May 25, 9:02 AM CDTTornado WatchSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 27 more7 hr
May 25, 10:13 AM CDTMesoscale DiscussionSPCAnderson, Archer, Baylor, Bell, Bosque, Brown and 69 more2 hr
May 25, 10:54 AM CDTTornado WatchSPCArcher, Baylor, Bell, Bosque, Brown, Callahan and 55 more7 hr
May 25, 11:37 AM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bastrop, Bexar, Blanco, Burnet and 26 more113 min
May 25, 1:54 PM CDTMesoscale DiscussionSPCBell, Bosque, Clay, Collin, Cooke, Coryell and 26 more2 hr
May 25, 2:10 PM CDTMesoscale DiscussionSPCAustin, Bastrop, Bexar, Blanco, Brazos, Burleson and 26 more95 min
May 25, 2:35 PM CDTMesoscale DiscussionSPCAnderson, Austin, Bowie, Brazos, Burleson, Camp and 34 more55 min
May 25, 2:52 PM CDTTornado WatchSPCAnderson, Angelina, Bastrop, Blanco, Bowie, Brazos and 53 more8 hr
May 25, 3:19 PM CDTMesoscale DiscussionSPCAtascosa, Bandera, Bexar, Dimmit, Edwards, Frio and 9 more56 min

Nearby

Tornado Watches in Texas, 2015Tornado Watches in Louisiana, 2015Every tornado watch in 2015

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.