Alert archive / Texas / Mesoscale Discussions in 2012

Mesoscale Discussion 592

April 26, 20125 states

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2012, 1:53 PM MDT for 5 states. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Apr 26, 2012, 1:53 PM MDT (19:53 UTC)
Expired: Apr 26, 2012, 3:00 PM MDT
In force: 67 min
Issued by: the Storm Prediction Center

All 26 counties

Baca County, CO, Bent County, CO, Morton County, KS, Curry County, NM, Quay County, NM, Union County, NM, Cimarron County, OK, Texas County, OK, Armstrong County, TX, Bailey County, TX, Carson County, TX, Castro County, TX, Dallam County, TX, Deaf Smith County, TX, Hale County, TX, Hansford County, TX, Hartley County, TX, Hutchinson County, TX, Lamb County, TX, Moore County, TX, Oldham County, TX, Parmer County, TX, Potter County, TX, Randall County, TX, Sherman County, TX, Swisher County, TX

The radar

The Amarillo radar (KAMA), 90 km from the middle of the area, began a volume at 19:55 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

Severe Thunderstorm Watch 192Apr 26, 2:45 PM MDT

The nearest sounding before it

Amarillo Airport, TX (KAMA), launched 12:00Z, 7.9 hours before the alert went out and 91 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: 1226 J/kg
Mixed-layer CIN: -201 J/kg
Mixed-layer LCL: 1742 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 62 m²/s²
0-3 km storm-relative helicity: 64 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.0

Open this sounding in Storm Lab

The text

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

991 
ACUS11 KWNS 261954
SWOMCD
SPC MCD 261953
TXZ000-OKZ000-KSZ000-COZ000-NMZ000-262100-

MESOSCALE DISCUSSION 0592
NWS STORM PREDICTION CENTER NORMAN OK
0253 PM CDT THU APR 26 2012

AREAS AFFECTED...NERN NM...SERN CO...FAR SWRN KS...WRN TX/OK
PANHANDLES

CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE

VALID 261953Z - 262100Z

CONVECTIVE INITIATION WILL BE POSSIBLE BY 21-22Z ACROSS THE
SRN/CNTRL HIGH PLAINS. THE ENVIRONMENT WILL SUPPORT A PRIMARY THREAT
OF LARGE HAIL AND DMGG WINDS. COVERAGE IS EXPECTED TO REMAIN
ISOLATED THROUGH LATE AFTERNOON...BUT CONVECTIVE TRENDS ARE BEING
MONITORED FOR A POSSIBLE WW.

VISIBLE/WATER VAPOR SATELLITE LOOPS SHOW INFERRED LARGE-SCALE ASCENT
SPREADING EWD INTO THE HIGH PLAINS /DENOTED BY AN INCREASE IN
MID/HIGH-LEVEL CLOUDINESS/...AHEAD OF A COMPACT SHORTWAVE UPPER
TROUGH CURRENTLY POSITIONED OVER AZ. A WEAKLY CONFLUENT SFC TROUGH
WAS ANALYZED AT 19Z FROM 20 E PUB...SWD TO CVS...ARCING BACK TO THE
ESE TO 20 N BGS. RICHER BOUNDARY LAYER MOISTURE WAS LOCATED E OF
THIS FEATURE...AS REFLECTED IN SFC OBS BY MID 50S TO LOWER 60S F SFC
DEWPOINTS.

ANALYZED PRESSURE FALLS OF -2 TO -4 MB PER 2 HRS SUGGEST SFC LOW
WILL CONTINUE TO DEEPEN THIS AFTERNOON OVER ERN CO...AND IS EXPECTED
TO RESULT IN INCREASING BOUNDARY LAYER FLOW AND LOW-LEVEL
CONVERGENCE ALONG THE SFC TROUGH. AS LARGE-SCALE ASCENT CONTINUES TO
OVERSPREAD THE AREA AND TEMPERATURES WARM INTO THE LOW 80S...CINH
SHOULD ERODE AND SUPPORT THE DEVELOPMENT OF ISOLATED
TSTMS...INITIALLY FOCUSED ALONG THE AFOREMENTIONED LEE SFC TROUGH.
MODERATE MIDLEVEL FLOW /SAMPLED 30-40 KTS AT 6 KM AGL/ ATOP ESELY
LOW-LEVEL FLOW WILL BE FAVORABLE FOR SUPERCELLS. PRIMARY THREATS
APPEAR TO INITIALLY BE LARGE HAIL AND DMGG WINDS...WHILE TOR THREAT
SHOULD BE LIMITED THIS AFTERNOON BY DEEP BOUNDARY LAYER MIXING/HIGH
LCL HEIGHTS.

..ROGERS/THOMPSON.. 04/26/2012

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...DDC...LUB...AMA...PUB...ABQ...

LAT...LON   33800156 33750227 34230334 36220385 37530378 37990335
            38130271 37740206 36790147 35900120 34210121 33800156

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 2:42 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Crowley, Kiowa, Las Animas, Otero and 1 more	6 hr
Apr 26, 2:47 PM MDT	Mesoscale Discussion	SPC	Adams, Arapahoe, Logan, Morgan, Washington, Weld	58 min
Apr 26, 5:31 PM MDT	Mesoscale Discussion	SPC	Baca, Bent, Kiowa, Otero, Prowers	119 min

Nearby

Mesoscale Discussions in Texas, 2012 Mesoscale Discussions in New Mexico, 2012 Mesoscale Discussions in Colorado, 2012 Every mesoscale discussion in 2012

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.