Alert archive / Texas / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 75, NWS Midland/Odessa, TX

May 1, 1999Gaines County, Texas

NWS Midland/Odessa, TX issued this severe thunderstorm warning at May 1, 1999, 9:17 PM CDT for Gaines County, Texas. It was in force for 28 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: May 1, 1999, 9:17 PM CDT (02:17 UTC)
Expired: May 1, 1999, 9:45 PM CDT
In force: 28 min
Issued by: NWS Midland/Odessa, TX
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Gaines County, TX

The radar

The Midland/Odessa radar (KMAF), 98 km from the middle of the area, began a volume at 02:21 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
May 1, 5:00 PM CDT	Tornado Watch	SPC	5 hr
May 1, 8:30 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Midland Regional, TX (KMAF), launched 00:00Z, 2.3 hours before the alert went out and 97 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: 844 J/kg
Mixed-layer CIN: -88 J/kg
Mixed-layer LCL: 804 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 143 m²/s²
0-3 km storm-relative helicity: 232 m²/s²
Significant tornado parameter: 0.7
Supercell composite: 5.8

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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Midland/Odessa, TX wrote its last area forecast discussion before this severe thunderstorm warning went out at May 1, 1:45 PM CDT, 7 hours 32 minutes earlier.

Area forecast discussion, May 1, 1:45 PM CDT, 7 hours 32 minutes before

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE MIDLAND TX
145 PM CDT SAT MAY 1 1999

BLOCKING PATTERN OVER THE CENTRAL U.S. FINALLY BEGINNING TO BREAK UP.
MAIN CHALLENGE THIS PERIOD IS TO FIGURE OUT THE JUST HOW QUICKLY THE
UPPER LOW WILL LIFT OUT OF THE SWRN US...AND MUCH OF THIS WILL DEPEND
ON THE TIMING AND MOVEMENT OF THE OTHER LOW OFF THE SERN U.S. COAST.
IT LOOKS LIKE THE SERN LOW WILL FINALLY BEGIN TO PROGRESS EWD...AND
THIS SHOULD ALLOW THE LOW TO OUR WEST TO BEGIN LIFTING OUT ON
SUNDAY. FOR TONIGHT...SIGNIFICANT CONVECTION IS THE MAIN CONCERN. I
BELIEVE THE DRYLINE WILL CONTINUE TO ADVANCE EWD THIS AFTERNOON AND
KICK OFF STORMS. WITH THE LOW BEGINNING TO LIFT...I EXPECT A SERIES
OF SHORTWAVES TO EJECT OUT OF THE SYSTEM...AND THIS WILL PROBABLY
KEEP CONVECTION ACTIVE TONIGHT. TOMORROW THE LOW BEGINS TO LIFT...BUT
I STILL EXPECT SOME LINGERING CLOUDS AND PCPN DURING THE MORNING
HOURS. LOOKS LIKE SOME DRIER SFC AIR WILL SWEEP IN FROM THE WEST
DURING THE AFTERNOON TOMORROW AS THE SFC LOW LIFTS NORTH...BUT WINDS
SHOULD QUICKLY SWITCH BACK AROUND TO A SLY OR SELY DIRECTION LATE
SUNDAY NIGHT...AND THEN BECOME MORE SWLY DURING THE DAY ON MONDAY FOR
A BIT OF A WARMUP. UPPER LEVEL FLOW PATTERN ON MONDAY SHOULD BE
NEARLY ZONAL.

PRELIM TEMPS/POPS...
MAF 52/78/53/85 4200
CNM 52/81/52/87 3100
MRF 45/77/45/80 2100
P07 58/79/56/86 3100

DJK

In the hours before

Local storm report, May 1, 7:25 PM CDT, 1 hour 52 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE MIDLAND TX
725 PM CDT SAT MAY 01 1999

TIME(CDT)  .....CITY LOCATION.....   STATE...EVENT/REMARKS...
           ....COUNTY LOCATION....

345 PM     SEMINOLE                  TX   FLOODING
05/01/99   GAINES                         F.M. ROAD 303 NEAR HWY 180
                                          IMPASSIBLE

438 PM     15 SE SEMINOLE            TX   TORNADO
05/01/99   GAINES                         SPOTTER REPORTED TORNADO
                                          NEAR HWYS 1429 AND 422

450 PM     15 W LAMESA               TX   TORNADO
05/01/99   DAWSON                         SHERIFF OFFICE REPORTED
                                          TORNADO NEAR SAND

515 PM     10 S WELCH                TX   TORNADO
05/01/99   DAWSON                         SHERIFF OFFICE REPORTED
                                          TORNADO ON GROUND

536 PM     10 W TARZAN               TX   TORNADO
05/01/99   MARTIN                         SPOTTER REPORTED
                                          TORNADO AT INTERSECTION
                                          HWYS 349 AND 176

629 PM     TARZAN                    TX   TORNADO
05/01/99   MARTIN                         PUBLIC REPORTED TORNADO

01

The office that day

Everything else NWS Midland/Odessa, TX issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
May 1, 8:42 PM CDT	Flash Flood Warning	MAF	Gaines	3 hr
May 1, 9:41 PM CDT	Severe Thunderstorm Warning	MAF	Andrews, Gaines	34 min
May 1, 9:47 PM CDT	Severe Thunderstorm Warning	MAF	Dawson	58 min
May 1, 11:14 PM CDT	Flash Flood Warning	MAF	Borden, Dawson	61 min
May 1, 11:41 PM CDT	Severe Thunderstorm Warning	MAF	Scurry	64 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.