Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 112, NWS Amarillo, TX

June 11, 1999Dallam County, Texas

NWS Amarillo, TX issued this severe thunderstorm warning at Jun 11, 1999, 9:55 PM CDT for Dallam County, Texas. It was in force for 50 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 11, 1999, 9:55 PM CDT (02:55 UTC)
Expired: Jun 11, 1999, 10:45 PM CDT
In force: 50 min
Issued by: NWS Amarillo, TX
Area: Whole counties

County Dallam County, TX

The radar

The Amarillo radar (KAMA), 141 km from the middle of the area, began a volume at 02:58 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 11, 6:30 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 00:00Z, 2.9 hours before the alert went out and 142 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: 753 J/kg
Mixed-layer CIN: -166 J/kg
Mixed-layer LCL: 1089 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 75 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.0
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.

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.

NWS Amarillo, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 11, 3:10 PM CDT, 6 hours 45 minutes earlier.

Area forecast discussion, Jun 11, 3:10 PM CDT, 6 hours 45 minutes before

TEXAS/OKLAHOMA PANHANDLES AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE AMARILLO TX
310 PM CDT FRI JUN 11 1999

LATEST ANALYSIS SHOWS WEAK COLD FRONT HAS STALLED IN EXTRM SRN TX
PNHDL. BASED ON WIND AND PRESSURE FIELDS UPSTREAM...THIS FEATURE MAY
ACTUALLY REMAIN NEARLY PUT OR REFORM TO THE NORTH WITH TIME...ONLY
TO GET ANOTHER SWD PUSH DEPENDING ON EXTENT OF TSTM DVLPMT. THIS
FRONT MAY ALSO BECOME HARD TO DEPICT DUE TO NUMEROUS OUTFLOW
BOUNDARIES FROM TSTM CLUSTERS DURG NEXT COUPLE DAYS. NEEDLESS TO SAY
THE SFC PATTERN WILL BE RATHER COMPLEX WITH SVRL BOUNDARIES TO WORK
WITH.

MODELS ARE IN GENERAL AGREEMENT AT UPPER LVLS THROUGH 48 HRS AS WEAK
SRN BRANCH CONTINUES TO SEND MINOR SHORTWAVES INTO THE REGION. ONE
IS PROGGED TO RACE ACROSS TNGT AND IS SHOWING UP ON SATELLITE
IMAGERY. ANOTHER ONE IS DUE IN LATER SATURDAY. THE UPPER FLOW THEN
BEGINS TRANSITIONING TO A RIDGE ALONG THE SPINE OF THE ROCKIES AND AN
ORGANIZING TROF OVER THE ERN US BY LATER SUNDAY. PNHDLS WILL THEN BE
IN THE DREADED NW FLOW PATTERN WITH CORRESPONDING LOW LVL UPSLOPE
FLOW. IT ALSO APPEARS ANOTHER WEAK COLD FRONT TRIES TO ENTER INTO
THE PICTURE DURG EXTENDED PERIODS. ALL THIS POINTS TO CONTINUED
CHCS FOR TSTMS EACH AND EVERY DAY OVER THE NEXT 5 DAYS.

FOR TNGT...WILL GO AHEAD AND ISSUE FLASH FLOOD WATCH FOR SRN TX
PNHDL DUE TO COMBINATION OF LOW FFG...PROXIMITY OF BOUNDARY...AND
APCHG SHORTWAVE. REFER TO QPFERD AND 94E FOR FURTHER INFO. WOULD
THINK BEST THREAT FOR HEAVY/EXCESSIVE RAINS IS GOING TO BE ALONG THE
BOUNDARY WHICH IS DRAPED ACROSS SRN ZNS. MAY MENTION LOCALLY HEAVY
RAINS ACROSS THE NRN SECTIONS.

SAT AND SUN APPEAR TO BE MORE OF THE SAME BASED ON ABV DISCUSSION.
HAVE LEANED MORE TOWARDS ETA HANDLING OF PRECIP BASED ON BETTER
VERIFICATION RECORD COMPARED TO THE NGM AND AVN. AVN HAS BEEN
HORRIBLE WITH PRECIP PROGS AS IT HAS BEEN PLACING IT MUCH FURTHER N
THAN WHAT ACTUALLY OCCURRED. REFER TO QPFPFD AND RELATED NMC PROGS/
DISCUSSIONS. WILL ALSO MAINTAIN CHCS FOR TSTMS THRU EXTENDED PERIODS
AS LONG RANGE PROGS AGREE ON A WRN US RIDGE/ERN US TROF WITH PNHDLS
IN NW FLOW ALONG WITH PLENTY OF MOISTURE AND ATTENDANT UPSLOPE FLOW.
PRELIM VALUES FOLLOW.

DHT 57/79/57/79  6454
GUY 59/79/58/79  6453
AMA 61/79/59/79  6454

.AMA...
TX...FLASH FLOOD WATCH FOR TONIGHT FOR ZONES 011>020.
OK...NONE.

ANDRADE

The office that day

Everything else NWS Amarillo, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 11, 8:36 PM CDT	Severe Thunderstorm Warning	AMA	Carson	39 min
Jun 11, 8:52 PM CDT	Severe Thunderstorm Warning	AMA	Hartley	38 min
Jun 11, 9:17 PM CDT	Severe Thunderstorm Warning	AMA	Dallam	43 min
Jun 11, 10:24 PM CDT	Severe Thunderstorm Warning	AMA	Sherman	36 min
Jun 11, 10:52 PM CDT	Severe Thunderstorm Warning	AMA	Texas	68 min

Nearby

Severe Thunderstorm Warnings in Texas, 1999 Every severe thunderstorm warning 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.