Alert archive / Texas / Severe Thunderstorm Watches in 1997

Severe Thunderstorm Watch 154

April 11, 199734 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 11, 1997, 9:30 AM CDT for 34 counties in Texas. It was in force for 6 hr.

The area

The outline as issued.

The facts

Issued
Apr 11, 1997, 9:30 AM CDT (14:30 UTC)
Expired
Apr 11, 1997, 3:00 PM CDT
In force
6 hr
Issued by
the Storm Prediction Center
All 34 counties

Anderson County, TX, Angelina County, TX, Bastrop County, TX, Bell County, TX, Brazos County, TX, Burleson County, TX, Caldwell County, TX, Cherokee County, TX, Falls County, TX, Freestone County, TX, Gregg County, TX, Grimes County, TX, Guadalupe County, TX, Harrison County, TX, Henderson County, TX, Houston County, TX, Lee County, TX, Leon County, TX, Limestone County, TX, Madison County, TX, Marion County, TX, McLennan County, TX, Milam County, TX, Nacogdoches County, TX, Panola County, TX, Robertson County, TX, Rusk County, TX, Shelby County, TX, Smith County, TX, Travis County, TX, Trinity County, TX, Upshur County, TX, Walker County, TX, Williamson County, TX

The radar

The Ft Hood radar (KGRK), 119 km from the middle of the area, began a volume at 14:33 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

Shreveport, LA (KSHV), launched 12:00Z, 2.5 hours before the alert went out and 278 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, Shreveport, LA at 12:00Z on 1997-04-11Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 53 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, Shreveport, LA at 12:00Z on 1997-04-11The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 176 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
53 J/kg
Mixed-layer CIN
-195 J/kg
Mixed-layer LCL
595 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
176 m²/s²
0-3 km storm-relative helicity
298 m²/s²
Significant tornado parameter
0.0
Supercell composite
2.3

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 10, 8:15 PM CDTSevere Thunderstorm WatchSPCHardeman6 hr
Apr 10, 8:45 PM CDTTornado WatchSPCAndrews, Borden, Briscoe, Castro, Childress, Coke and 36 more6 hr
Apr 11, 3:00 AM CDTTornado WatchSPCArcher, Baylor, Brown, Callahan, Clay, Coke and 26 more6 hr
Apr 11, 2:30 PM CDTTornado WatchSPCAustin, Brazoria, Calhoun, Chambers, Colorado, Fayette and 18 more6 hr

Nearby

Severe Thunderstorm Watches in Texas, 1997Every severe thunderstorm watch in 1997

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.