Alert archive / Texas / Severe Thunderstorm Watches in 2000

Severe Thunderstorm Watch 221

April 30, 200015 counties in Texas

The Storm Prediction Center issued this severe thunderstorm watch at Apr 30, 2000, 4:15 AM CDT for 15 counties in Texas. It was in force for 5 hr.

The area

The outline as issued.

The facts

Issued
Apr 30, 2000, 4:15 AM CDT (09:15 UTC)
Expired
Apr 30, 2000, 9:00 AM CDT
In force
5 hr
Issued by
the Storm Prediction Center

Counties Anderson County, TX, Collin County, TX, Dallas County, TX, Denton County, TX, Ellis County, TX, Henderson County, TX, Hill County, TX, Hunt County, TX, Johnson County, TX, Kaufman County, TX, Navarro County, TX, Rains County, TX, Rockwall County, TX, Tarrant County, TX, Van Zandt County, TX

The radar

The Dallas/Ft Worth radar (KFWS), 56 km from the middle of the area, began a volume at 09:17 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.

Warnings issued inside it

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

IssuedProductOfficeCountiesLasted
Apr 30, 4:25 AM CDTSevere Thunderstorm WarningFWDTarrant65 min

The nearest sounding before it

Fort Worth, TX (KFWD), launched 00:00Z, 9.3 hours before the alert went out and 47 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 2000-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 897 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 2000-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 square meters per square second.1939Sfc1 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
897 J/kg
Mixed-layer CIN
-43 J/kg
Mixed-layer LCL
1531 m above ground
0-6 km bulk shear
30 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
70 m²/s²
Significant tornado parameter
0.1
Supercell composite
0.9

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 29, 7:30 PM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Callahan, Clay, Cooke, Denton and 21 more6 hr
Apr 30, 12:30 AM CDTTornado WatchSPCArmstrong, Bailey, Briscoe, Carson, Castro, Childress and 38 more6 hr
Apr 30, 12:45 AM CDTSevere Thunderstorm WatchSPCArcher, Baylor, Clay, Foard, Haskell, Jack and 11 more5 hr
Apr 30, 6:00 AM CDTSevere Thunderstorm WatchSPCArmstrong, Briscoe, Carson, Childress, Collingsworth, Cottle and 14 more5 hr
Apr 30, 2:15 PM CDTTornado WatchSPCArcher, Baylor, Childress, Clay, Cottle, Dickens and 13 more6 hr
Apr 30, 4:30 PM CDTSevere Thunderstorm WatchSPCBrown, Callahan, Coleman, Comanche, Concho, Eastland and 10 more6 hr

Nearby

Severe Thunderstorm Watches in Texas, 2000Every severe thunderstorm watch in 2000

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.