Alert archive / Texas / Tornado Warnings in 1999

Tornado Warning 55, NWS Houston/Galveston, TX

May 30, 1999Colorado County, Texas

NWS Houston/Galveston, TX issued this tornado warning at May 30, 1999, 8:15 PM CDT for Colorado County, Texas. It was in force for 45 min. 2 reports came from inside the area while it was in force.

The area

The counties it named, with what was reported inside it.

The facts

Issued: May 30, 1999, 8:15 PM CDT (01:15 UTC)
Expired: May 30, 1999, 9:00 PM CDT
In force: 45 min
Issued by: NWS Houston/Galveston, TX
Area: Whole counties

County Colorado County, TX

The radar

The Houston radar (KHGX), 141 km from the middle of the area, began a volume at 01:15 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 was reported inside it

Time	Report	Where	Remark
May 30, 8:24 PM CDT	Hail 1.75	Glidden, TX	Golfball-sized hail in Glidden
May 30, 8:45 PM CDT	Hail 2.75	Sheridan, TX	Numerous reports of baseball-sized hail between Sheridan and Columbus.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Corpus Christi, TX (KCRP), launched 00:00Z, 1.3 hours before the alert went out and 225 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 3761 J/kg
Mixed-layer CIN: -12 J/kg
Mixed-layer LCL: 797 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 111 m²/s²
Significant tornado parameter: 1.9
Supercell composite: 8.8

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.

What forecasters said that day

The local office's own words before this tornado warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Houston/Galveston, TX wrote its last area forecast discussion before this tornado warning went out at May 30, 2:45 PM CDT, 5 hours 30 minutes earlier.

Area forecast discussion, May 30, 2:45 PM CDT, 5 hours 30 minutes before

SOUTHEAST TEXAS FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HOUSTON/GALVESTON TX
245 PM CDT SUN MAY 30 1999

LAST GASP OF SHRA/TSRA SHD DIE A DIURNAL DEATH THIS EVENING WITH
EXITING VORT ENERGY AND LOSS OF SFC HEATING. WILL TAKE A LOOK AT RADAR
PRIOR TO PRESS TIME TO BETTER REFINE WHERE MENTION IS NEEDED EARLY
IN FIRST PERIOD. MOS HAS BEEN RUNNING WARM LATELY ON NIGHTTIME MINS.
WILL LOWER VALUES JUST A HAIR.

FOR MON...WAS ON THE FENCE AS TO WHAT TO DO REGARDING MENTION OF
PSBL ISOLD CONVECTION. ETA PAINTS A DECENT INSTAB AXIS ACRS AREA.
BEST MOISTURE NE HALF. NOTICED SWODY2...IT HAS US IN A GEN OUTLOOK.
WILL GO AHEAD AND MENTION ISOLD ACTIVITY FOR NE ZONES AND MAYBE SOME
ERN COASTAL ZONES. THANKS FOR THE COORD FTW AND SHV.

OTRW...H5 RDG IS IN CONTROL FOR MUCH OF THE WEEK. PW VALUES
HOVERING AROUND 1.5 INCHES THRU 48 HRS. MOISTURE IS THERE...BUT
DONT SEE ANY S/W ACTION OR SFC FEATURES THAT WOULD INDICATE A NEED
TO MENTION PRECIP. ISOLD POTENTIAL ALG SEABREEZE FNT OR ANY LEFTOVER
CONVECTIVE BOUNDARIES CAN BE HANDLED ON A DAY TO DAY BASIS.
GENERALLY THO...A WARM AND HUMID PERIOD THROUGH MID TO LATE WEEK.
DAYTIME TEMPS AT OR SLIGHTLY ABOVE MOS FCSTS.

ALLS QUIET IN THE MARINE AREA. NO FLAGS THIS PKG.

.HGX...NONE.

PRELIMS...
CLL BB 071/095 072/095 072 -00
IAH BB 072/095 073/095 073 -00
GLS BB 075/086 075/086 075 010

46/43

The office that day

Everything else NWS Houston/Galveston, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 30, 7:29 PM CDT	Severe Thunderstorm Warning	HGX	Houston	46 min
May 30, 7:40 PM CDT	Tornado Warning	HGX	Colorado	35 min
May 30, 7:52 PM CDT	Severe Thunderstorm Warning	HGX	Austin	53 min
May 30, 9:00 PM CDT	Severe Thunderstorm Warning	HGX	Colorado	45 min

Nearby

Tornado Warnings in Texas, 1999 Every tornado warning in 1999 Tornadoes in 1999

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.