Alert archive / Texas / Severe Thunderstorm Warnings in 1986

Severe Thunderstorm Warning 37, NWS Austin/San Antonio, TX

April 20, 1986Calhoun County, Texas

NWS Austin/San Antonio, TX issued this severe thunderstorm warning at Apr 20, 1986, 1:50 AM CST for Calhoun County, Texas. It was in force for 70 min.

The area

The counties it named.

The facts

Issued: Apr 20, 1986, 1:50 AM CST (07:50 UTC)
Expired: Apr 20, 1986, 3:00 AM CST
In force: 70 min
Issued by: NWS Austin/San Antonio, TX
Area: Whole counties

County Calhoun County, TX

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Victoria Regiona, TX (KVCT), launched 00:00Z, 7.8 hours before the alert went out and 53 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: 635 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 622 m above ground
0-6 km bulk shear: 30 kt
0-1 km storm-relative helicity: 56 m²/s²
0-3 km storm-relative helicity: 78 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 0.6

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KVCT 200758
SVRVCT
TXC057-200900-

BULLETIN - IMMEDIATE BROADCAST REQUESTED/EBS ACTIVATION REQUESTED
SEVERE THUNDERSTORM AND SPECIAL MARINE WARNING
NATIONAL WEATHER SERVICE VICTORIA TX
150 AM CST SUN APR 20 1986

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM AND
SPECIAL MARINE WARNING EFFECTIVE UNTIL 300 AM CST FOR PEOPLE IN THE
FOLLOWING COUNTY OF

TEXAS...SOUTH CALHOUN

AT 145 AM A LINE OF VERY HEAVY THUNDERSTORMS WERE OCCURRING ALONG THE
GULF COAST FROM THE SAN ANTONIO BAY TO MATAGORDAY BAY EXTENDING TO
GALVESTON. THESE THUNDERSTORMS WERE MOVING EST AT 25 MPH.

FREQUENT LIGHTNING..STRONG DAMAGING WIND AND POSSIBLE HAIL MAY
ACCOMPANY THIS STORM.
BOATERS AND MARINE INTEREST SHOULD TAKE THE NECESSARY PRECAUTIONS TO
PROTECT LIFE AND PROPERTY DUE TO GUSTY WINDS.

IF THREATENING WEATHER APPROACHES..YOU SHOULD GO TO A SAFE PLACE
IMMEDIATELY AND YOU SHOULD ASK THE NEAREST LAW ENFORCEMENT AGENCY
TO RELAY YOUR SEVERE WEATHER REPORTS TO THE" LOCAL NATIONAL WEATHER
SERVICE OFFICE.

PLEASE LISTEN TO YOUR LOCAL RADIO..TV..OR NOAA WEATHER RADIO FOR
LATER STATEMENTS REGARDING THIS SEVERE WEATHER EPISODE.

What forecasters said that day

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

In the hours before

Local storm report, Apr 19, 9:14 PM CST, 4 hours 36 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN TX
913 PM CST SAT 19 APR 1986

TIME CST     REPORT

400 PM       10W LLANO LARGE HAIL STRIPPED PEACH CROP.
415 PM        9N LLANO S.O. REPORTED HAIL UNKNOWN SIZE.
430 PM       NEAR LLANO HAIL SLIGHTLY SMALLER THAN GOLF BALL.
435 PM       TOW..HAIL AND HIGH WINDS..LIGHT DAMAGE.
440 PM       WIND GUST TO 50 MPH AND SMALL HAIL AT BURNET.
501 PM       AT CITY OF BURNET..2 INCH HAIL.
530 PM       PRIDDY..1/2 INCH HAIL.
550 PM       STRONG WIND SHIFT AT LAKE TRAVIS.  OUTFLOW BNDRY.
600 PM       10N GEORGETOWN..5/8 INCH HAIL.
605 PM       PEA SIZE HAIL AT GEORGETOWN.
620 PM       WIND SHIFT AT WSO..PEAK GUST 29 MPH. OUTFLOW BNDRY.
635 PM       SIESTA SHORES..SOUTH SIDE OF LAKE TRAVIS..MARBLE HAIL.
637 PM       LAKEWAY RESORT..LAKE TRAVIS..PEA TO MARBLE SIZE HAIL.
640 PM       AIRCRAFT 737 REPORTED SEVERE TURBULENCE 10NE AUS.
705 PM       ROCKDALE..MILAM CO..PEA SIZE HAIL.
720 PM       SW AUSTIN..WEST LAKE HILLS..SMALL HAIL.
722 PM       1/4 TO 1/2 INCH HAIL OVER CENTRAL CITY AUSTIN.
730 PM       PILOT REPORTED FUNNEL CLOUD..ALOFT..20 MI E AUSTIN.
827 PM       4W ELROY..15 SE OF AUS..1/2 TO 3/4 INCH HAIL.

END/JVD.

Local storm report, Apr 19, 11:23 PM CST, 2 hours 27 minutes before

LOCAL STORM REPORT
NATIONAL WEATHER SERVICE AUSTIN TX
913 PM CST SAT 19 APR 1986

TIME CST     REPORT

400 PM       10W LLANO LARGE HAIL STRIPPED PEACH CROP.
415 PM        9N LLANO S.O. REPORTED HAIL UNKNOWN SIZE.
430 PM       NEAR LLANO HAIL SLIGHTLY SMALLER THAN GOLF BALL.
435 PM       TOW..HAIL AND HIGH WINDS..LIGHT DAMAGE.
440 PM       WIND GUST TO 50 MPH AND SMALL HAIL AT BURNET.
501 PM       AT CITY OF BURNET..2 INCH HAIL.
530 PM       PRIDDY..1/2 INCH HAIL.
550 PM       STRONG WIND SHIFT AT LAKE TRAVIS.  OUTFLOW BNDRY.
600 PM       10N GEORGETOWN..5/8 INCH HAIL.
605 PM       PEA SIZE HAIL AT GEORGETOWN.
620 PM       WIND SHIFT AT WSO..PEAK GUST 29 MPH. OUTFLOW BNDRY.
635 PM       SIESTA SHORES..SOUTH SIDE OF LAKE TRAVIS..MARBLE HAIL.
637 PM       LAKEWAY RESORT..LAKE TRAVIS..PEA TO MARBLE SIZE HAIL.
640 PM       AIRCRAFT 737 REPORTED SEVERE TURBULENCE 10NE AUS.
705 PM       ROCKDALE..MILAM CO..PEA SIZE HAIL.
720 PM       SW AUSTIN..WEST LAKE HILLS..SMALL HAIL.
722 PM       1/4 TO 1/2 INCH HAIL OVER CENTRAL CITY AUSTIN.
730 PM       PILOT REPORTED FUNNEL CLOUD..ALOFT..20 MI E AUSTIN.
827 PM       4W ELROY..15 SE OF AUS..1/2 TO 3/4 INCH HAIL.

END/JVD.

The office that day

Everything else NWS Austin/San Antonio, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 19, 9:47 PM CST	Severe Thunderstorm Warning	EWX	Lavaca	13 min
Apr 19, 9:51 PM CST	Severe Thunderstorm Warning	EWX	La Salle	54 min
Apr 19, 10:49 PM CST	Severe Thunderstorm Warning	EWX	Atascosa, McMullen	56 min
Apr 19, 11:18 PM CST	Severe Thunderstorm Warning	EWX	La Salle	42 min

Nearby

Severe Thunderstorm Warnings in Texas, 1986 Every severe thunderstorm warning in 1986

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.