Alert archive / Texas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 4, NWS Midland/Odessa, TX

April 20, 2011Pecos County, Texas

NWS Midland/Odessa, TX issued this severe thunderstorm warning at Apr 20, 2011, 8:21 PM CDT for Pecos County, Texas. It was in force for 34 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Apr 20, 2011, 8:21 PM CDT (01:21 UTC)
Expired
Apr 20, 2011, 8:55 PM CDT
In force
34 min
Issued by
NWS Midland/Odessa, TX
Area
Storm-based polygon

County Pecos County, TX

The radar

The Midland/Odessa radar (KMAF), 118 km from the middle of the area, began a volume at 01:24 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

TimeReportWhereRemark
Apr 20, 8:42 PM CDTHAIL 1Iraan, TX

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Midland Regional, TX (KMAF), launched 00:00Z, 1.4 hours before the alert went out and 118 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, Midland Regional, TX at 00:00Z on 2011-04-21Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Midland Regional, TX at 00:00Z on 2011-04-21The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 68 square meters per square second.193958Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
3519 m above ground
0-6 km bulk shear
36 kt
0-1 km storm-relative helicity
68 m²/s²
0-3 km storm-relative helicity
239 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

709 
WUUS54 KMAF 210121
SVRMAF
TXC371-210215-
/O.NEW.KMAF.SV.W.0004.110421T0121Z-110421T0215Z/

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX
821 PM CDT WED APR 20 2011

THE NATIONAL WEATHER SERVICE IN MIDLAND HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  EXTREME EAST CENTRAL PECOS COUNTY IN SOUTHWEST TEXAS...

* UNTIL 915 PM CDT

* AT 818 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND
  DAMAGING WINDS IN EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR
  IRAAN...OR 17 MILES NORTHWEST OF SHEFFIELD...MOVING EAST AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT THE FOLLOWING LOCATIONS...
  IRAAN...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A SEVERE THUNDERSTORM WARNING MEANS THAT SEVERE WEATHER IS OCCURRING
OR IS IMMINENT. WIND GUSTS IN EXCESS OF 60 MPH... HAIL AN INCH IN
DIAMETER OR LARGER... VERY HEAVY RAIN... AND DEADLY LIGHTNING ARE ALL
LIKELY. IF YOU ARE IN THE PATH OF THIS SEVERE STORM MOVE TO SAFE
SHELTER NOW.

&&

LAT...LON 3083 10199 3097 10204 3099 10198 3096 10195
      3096 10194 3093 10191 3093 10189 3092 10187
      3089 10188 3087 10185 3084 10185
TIME...MOT...LOC 0121Z 249DEG 11KT 3092 10192

$$
3 follow-up statements
019 
WWUS54 KMAF 210140
SVSMAF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX
840 PM CDT WED APR 20 2011

TXC371-210215-
/O.CON.KMAF.SV.W.0004.000000T0000Z-110421T0215Z/
PECOS TX-
840 PM CDT WED APR 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR EXTREME EAST CENTRAL PECOS COUNTY...

AT 836 PM CDT...NATIONAL WEATHER SERVICE METEOROLOGISTS CONTINUED TO 
DETECT A SEVERE THUNDERSTORM. THIS STORM HAS INTENSIFIED AND IS NOW 
CAPABLE OF PRODUCING GOLF BALL SIZE HAIL AND DAMAGING WINDS IN 
EXCESS OF 60 MPH.  THIS STORM WAS LOCATED NEAR IRAAN...OR ABOUT 16 
MILES NORTH OF SHEFFIELD...MOVING EAST AT 15 MPH.

SOME LOCATIONS AFFECTED BY THE SEVERE THUNDERSTORM INCLUDE...EXTREME
EAST CENTRAL PECOS COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH... PREPARE
IMMEDIATELY FOR DAMAGING WINDS... DESTRUCTIVE HAIL... AND DEADLY
CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AWAY FROM WINDOWS.

&&

LAT...LON 3083 10199 3097 10204 3099 10198 3096 10195
      3096 10194 3093 10191 3093 10189 3092 10187
      3089 10188 3087 10185 3084 10185
TIME...MOT...LOC 0139Z 249DEG 11KT 3091 10189

$$
841 
WWUS54 KMAF 210146
SVSMAF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX
846 PM CDT WED APR 20 2011

TXC371-210215-
/O.CON.KMAF.SV.W.0004.000000T0000Z-110421T0215Z/
PECOS TX-
846 PM CDT WED APR 20 2011

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR EXTREME EAST CENTRAL PECOS COUNTY...

AT 842 PM CDT...THE PUBLIC REPORTED QUARTER SIZE HAIL IN THE TOWN
OF IRAAN.  THIS STORM WAS LOCATED NEAR IRAAN...OR ABOUT 16 MILES 
NORTH OF SHEFFIELD...MOVING EAST AT 15 MPH.

SOME LOCATIONS AFFECTED BY THE SEVERE THUNDERSTORM 
INCLUDE...IRAAN...HIGHWAY 190 IN EXTREME EAST CENTRAL PECOS COUNTY.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH... PREPARE
IMMEDIATELY FOR DAMAGING WINDS... DESTRUCTIVE HAIL... AND DEADLY
CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO SHELTER...
PREFERABLY INSIDE A STRONG BUILDING AWAY FROM WINDOWS.

&&

LAT...LON 3083 10199 3097 10204 3099 10198 3096 10195
      3096 10194 3093 10191 3093 10189 3092 10187
      3089 10188 3087 10185 3084 10185
TIME...MOT...LOC 0143Z 249DEG 11KT 3091 10188

$$
047 
WWUS54 KMAF 210155
SVSMAF

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE MIDLAND/ODESSA TX
855 PM CDT WED APR 20 2011

TXC371-210204-
/O.CAN.KMAF.SV.W.0004.000000T0000Z-110421T0215Z/
PECOS TX-
855 PM CDT WED APR 20 2011

...THE SEVERE THUNDERSTORM WARNING FOR EXTREME EAST CENTRAL PECOS
COUNTY IS CANCELLED...

AT 854 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED THAT
THE STORM THAT PROMPTED THE SEVERE THUNDERSTORM WARNING HAD EXITED
THE WARNED AREA. THEREFORE THE SEVERE THUNDERSTORM WARNING IS
CANCELLED.

LAT...LON 3083 10199 3097 10204 3099 10198 3096 10195
      3096 10194 3093 10191 3093 10189 3092 10187
      3089 10188 3087 10185 3084 10185
TIME...MOT...LOC 0154Z 252DEG 11KT 3091 10183

$$

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 20, 9:08 PM CDTSevere Thunderstorm WarningMAFPecos37 min
Apr 21, 4:41 AM CDTRed Flag WarningMAF40 hr
Apr 21, 5:12 AM CDTHigh Wind WatchMAF10 hr
Apr 21, 3:29 PM CDTSevere Thunderstorm WarningMAFPecos61 min
Apr 21, 4:18 PM CDTTornado WarningMAFPecos, Terrell57 min
Apr 21, 5:14 PM CDTTornado WarningMAFPecos61 min
Apr 21, 5:47 PM CDTTornado WarningMAFPecos, Terrell58 min
Apr 21, 6:01 PM CDTSevere Thunderstorm WarningMAFScurry14 min
Apr 21, 6:45 PM CDTTornado WarningMAFTerrell60 min

Nearby

Severe Thunderstorm Warnings in Texas, 2011Every severe thunderstorm warning in 2011

Sources

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