Alert archive / Texas / Tornado Watches in 2015

Tornado Watch 200

May 23, 201540 counties in Texas

The Storm Prediction Center issued this tornado watch at May 23, 2015, 10:00 PM CDT for 40 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
May 23, 2015, 10:00 PM CDT (03:00 UTC)
Expired
May 24, 2015, 4:00 AM CDT
In force
6 hr
Issued by
the Storm Prediction Center
Largest hail expected
0.5 in
Strongest gust expected
65 kt
All 40 counties

Anderson County, TX, Austin County, TX, Bell County, TX, Bosque County, TX, Brazos County, TX, Burleson County, TX, Collin County, TX, Colorado County, TX, Coryell County, TX, Dallas County, TX, Delta County, TX, Denton County, TX, Ellis County, TX, Falls County, TX, Fannin County, TX, Freestone County, TX, Grayson County, TX, Grimes County, TX, Hamilton County, TX, Henderson County, TX, Hill County, TX, Hopkins County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Lamar County, TX, Lampasas County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, McLennan County, TX, Milam County, TX, Navarro County, TX, Rains County, TX, Robertson County, TX, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX, Waller County, TX, Washington County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 67 km from the middle of the area, began a volume at 03:04 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
30%
One or more EF2 to EF5 tornadoes
20%
Ten or more severe wind reports
30%
One or more gusts of 65 knots or more
30%
Ten or more severe hail reports
10%
One or more hailstones of 2 inches or more
5%
Six or more combined severe hail and wind reports
60%

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
May 23, 10:15 PM CDTSevere Thunderstorm WarningFWDBell, Milam75 min
May 23, 10:33 PM CDTSevere Thunderstorm WarningHGXBurleson27 min
May 23, 11:01 PM CDTSevere Thunderstorm WarningHGXBrazos, Burleson44 min
May 23, 11:12 PM CDTFlash Flood WarningFWDBell, Coryell3 hr
May 23, 11:12 PM CDTSevere Thunderstorm WarningFWDRobertson39 min
May 23, 11:37 PM CDTFlash Flood WarningFWDDallas, Ellis3 hr
May 24, 2:27 AM CDTFlash Flood WarningFWDDenton, Tarrant3 hr
May 24, 2:27 AM CDTTornado WarningFWDDallas, Tarrant18 min
May 24, 2:36 AM CDTFlash Flood WarningFWDCollin, Dallas3 hr
May 24, 3:25 AM CDTFlash Flood WarningFWDCooke, Grayson3 hr
May 24, 3:39 AM CDTSevere Thunderstorm WarningHGXAustin, Colorado, Jackson, Matagorda, Wharton36 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

Fort Worth, TX (KFWD), launched 00:00Z, 3.0 hours before the alert went out and 86 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, Fort Worth, TX at 00:00Z on 2015-05-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 537 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, Fort Worth, TX at 00:00Z on 2015-05-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 197 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
537 J/kg
Mixed-layer CIN
-56 J/kg
Mixed-layer LCL
858 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
197 m²/s²
0-3 km storm-relative helicity
288 m²/s²
Significant tornado parameter
0.0
Supercell composite
4.7

Open this sounding in Storm Lab

The text

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

680 
WWUS20 KWNS 240258
SEL0  
SPC WW 240258
TXZ000-240900-

URGENT - IMMEDIATE BROADCAST REQUESTED
TORNADO WATCH NUMBER 200
NWS STORM PREDICTION CENTER NORMAN OK
1000 PM CDT SAT MAY 23 2015

THE NWS STORM PREDICTION CENTER HAS ISSUED A

* TORNADO WATCH FOR PORTIONS OF 
  EAST CENTRAL AND NORTH TEXAS

* EFFECTIVE THIS SATURDAY NIGHT AND SUNDAY MORNING FROM 1000 PM
  UNTIL 400 AM CDT.

* PRIMARY THREATS INCLUDE...
  A COUPLE TORNADOES POSSIBLE
  ISOLATED SIGNIFICANT DAMAGING WIND GUSTS TO 75 MPH POSSIBLE

SUMMARY...A CLUSTER OF STRONG TO LOCALLY SEVERE THUNDERSTORMS
EXPECTED TO MOVE/DEVELOP NORTHEAST FROM THE AUSTIN AREA TOWARD WACO
AND PARTS OF NORTH TEXAS THROUGH EARLY SUNDAY. OTHER...MORE ISOLATED
STORMS MAY STRENGTHEN AHEAD OF THE CLUSTER. THE STORMS MAY YIELD
OCCASIONAL DAMAGING WIND GUSTS AND ISOLATED TORNADOES.

THE TORNADO WATCH AREA IS APPROXIMATELY ALONG AND 60 STATUTE
MILES EAST AND WEST OF A LINE FROM 35 MILES EAST NORTHEAST OF
SHERMAN TEXAS TO 55 MILES EAST OF NEW BRAUNFELS TEXAS.  FOR A
COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU0).

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 197...WW 198...WW 199...

AVIATION...TORNADOES AND A FEW SEVERE THUNDERSTORMS WITH HAIL
SURFACE AND ALOFT TO 0.5 INCH. EXTREME TURBULENCE AND SURFACE
WIND GUSTS TO 65 KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO
550. MEAN STORM MOTION VECTOR 21030.


...CORFIDI

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
May 23, 8:39 PM CDTMesoscale DiscussionSPCAtascosa, Bastrop, Bee, Bexar, Blanco, Caldwell and 18 more2 hr
May 23, 8:57 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Cooke, Denton, Fannin and 7 more93 min
May 23, 9:46 PM CDTMesoscale DiscussionSPCAnderson, Austin, Bell, Bosque, Brazos, Burleson and 28 more89 min
May 23, 10:31 PM CDTSevere Thunderstorm WatchSPCAransas, Brooks, Cameron, Hidalgo, Jim Hogg, Jim Wells and 8 more5 hr
May 23, 11:32 PM CDTMesoscale DiscussionSPCAnderson, Atascosa, Austin, Bell, Brazos, Burleson and 36 more88 min
May 23, 11:52 PM CDTMesoscale DiscussionSPCBrooks, Cameron, Duval, Hidalgo, Jim Wells, Kenedy and 3 more83 min
May 23, 11:59 PM CDTMesoscale DiscussionSPCBandera, Gillespie, Kendall, Kerr, Kinney, Real and 2 more91 min
May 24, 2:12 AM CDTMesoscale DiscussionSPCAransas, Brazoria, Calhoun, Cameron, Fort Bend, Jackson and 4 more93 min
May 24, 3:16 AM CDTMesoscale DiscussionSPCCollin, Fannin, Grayson59 min
May 24, 12:05 PM CDTMesoscale DiscussionSPCBowie, Cass, Marion115 min
May 24, 12:34 PM CDTTornado WatchSPCBowie, Cass, Morris6 hr
May 24, 3:15 PM CDTMesoscale DiscussionSPCArmstrong, Briscoe, Callahan, Childress, Coleman, Collingsworth and 26 more90 min

Nearby

Tornado Watches in Texas, 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.