Alert archive / Texas / Mesoscale Discussions in 2007

Mesoscale Discussion 554

April 23, 200724 counties in Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 23, 2007, 10:22 PM CDT for 24 counties in Texas. It was in force for 83 min.

The area

The outline as issued.

The facts

Issued
Apr 23, 2007, 10:22 PM CDT (03:22 UTC)
Expired
Apr 23, 2007, 11:45 PM CDT
In force
83 min
Issued by
the Storm Prediction Center
All 24 counties

Baylor County, TX, Callahan County, TX, Coke County, TX, Cottle County, TX, Crosby County, TX, Dickens County, TX, Fisher County, TX, Floyd County, TX, Foard County, TX, Garza County, TX, Haskell County, TX, Jones County, TX, Kent County, TX, King County, TX, Knox County, TX, Lubbock County, TX, Mitchell County, TX, Motley County, TX, Nolan County, TX, Scurry County, TX, Shackelford County, TX, Stonewall County, TX, Taylor County, TX, Throckmorton County, TX

The radar

The Dyess AFB radar (KDYX), 122 km from the middle of the area, began a volume at 03:23 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.

The nearest sounding before it

Midland Regional, TX (KMAF), launched 00:00Z, 3.4 hours before the alert went out and 202 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, Midland Regional, TX at 00:00Z on 2007-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1676 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, Midland Regional, TX at 00:00Z on 2007-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 133 square meters per square second.1939587897Sfc1 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
1676 J/kg
Mixed-layer CIN
-24 J/kg
Mixed-layer LCL
2126 m above ground
0-6 km bulk shear
43 kt
0-1 km storm-relative helicity
133 m²/s²
0-3 km storm-relative helicity
190 m²/s²
Significant tornado parameter
0.0
Supercell composite
6.9

Open this sounding in Storm Lab

The text

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

000 
ACUS11 KWNS 240323
SWOMCD
SPC MCD 240322 
TXZ000-240445-

MESOSCALE DISCUSSION 0554
NWS STORM PREDICTION CENTER NORMAN OK
1022 PM CDT MON APR 23 2007

AREAS AFFECTED...PORTIONS W-CENTRAL/NW TX.

CONCERNING...TORNADO WATCH 167...

VALID 240322Z - 240445Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 167 CONTINUES.

SBCINH INCREASES SUBSTANTIALLY WITH EWD EXTENT ACROSS NWRN/N-CENTRAL
TX...WHICH INDICATES THAT HORIZONTAL SHRINKING TREND EVIDENT IN
REFLECTIVITY IMAGERY SHOULD CONTINUE FOR SUPERCELL N ABI.  BEFORE
THIS STORM DISSIPATES COMPLETELY...HOWEVER...IT STILL MAY POSE
THREAT OF LARGE HAIL...STG-SVR GUSTS AND PERHAPS A TORNADO.

MEANWHILE CONVECTION ACROSS GARZA/KENT/DICKENS COUNTIES HAS
CONSOLIDATED INTO POTENTIALLY TORNADIC SUPERCELL WHICH...ACCORDING
TO MODIFIED RUC SOUNDINGS...BARELY HAS SFC-BASED EFFECTIVE INFLOW
LAYER.  AS FARTHER SE...MODIFIED RAOBS AND RUC SOUNDINGS SUGGEST
STRENGTHENING SBCINH WITH TIME ACROSS NW TX IN PROJECTED PATH OF
THIS ACTIVITY...INDICATING THREAT SHOULD NOT EXTEND SPATIALLY E OF
PRESENT WW AREA.  LOCAL WW EXTENSION IN TIME MAY BE REQUIRED -- FOR
A FEW COUNTIES IN PATH OF THIS ACTIVITY -- BEFORE IT DISSIPATES. 
OTHERWISE...CONVECTIVE INITIATION WILL BECOME LESS PROBABLE WITH
TIME...AND WW OUTSIDE THOSE LOCALIZED THREATS MAY BE ALLOWED TO
EXPIRE AS SCHEDULED AT 4Z.

..EDWARDS.. 04/24/2007

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...FWD...OUN...SJT...LUB...MAF...

31720087 33150125 33430183 34060183 34240013 33899906
32789890 32059923

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 23, 7:05 PM CDTMesoscale DiscussionSPCArmstrong, Baylor, Borden, Briscoe, Callahan, Carson and 46 more115 min
Apr 23, 7:48 PM CDTTornado WatchSPCEdwards, Kinney, Maverick, Real, Uvalde, Val Verde and 1 more105 min
Apr 23, 9:17 PM CDTMesoscale DiscussionSPCKinney, Uvalde118 min
Apr 24, 7:29 AM CDTMesoscale DiscussionSPCCrockett, Glasscock, Irion, Reagan, Sterling, Upton91 min
Apr 24, 11:23 AM CDTTornado WatchSPCArcher, Baylor, Clay, Wichita9 hr
Apr 24, 11:28 AM CDTMesoscale DiscussionSPCArcher, Baylor, Brown, Callahan, Clay, Coke and 33 more2 hr
Apr 24, 11:49 AM CDTTornado WatchSPCBrown, Callahan, Coke, Coleman, Collin, Comanche and 35 more11 hr
Apr 24, 12:40 PM CDTMesoscale DiscussionSPCBosque, Collin, Coryell, Dallas, Delta, Denton and 23 more2 hr
Apr 24, 2:40 PM CDTTornado WatchSPCBosque, Bowie, Camp, Cass, Delta, Ellis and 21 more8 hr
Apr 24, 3:58 PM CDTTornado Watch PDSSPCAnderson, Bandera, Bell, Bexar, Blanco, Brown and 43 more7 hr
Apr 24, 6:16 PM CDTMesoscale DiscussionSPCArcher, Baylor, Clay, Wichita119 min
Apr 24, 6:44 PM CDTMesoscale DiscussionSPCBandera, Bell, Bexar, Blanco, Bosque, Brown and 39 more2 hr

Nearby

Mesoscale Discussions in Texas, 2007Every mesoscale discussion in 2007

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.