Alert archive / Colorado / Mesoscale Discussions in 2012

Mesoscale Discussion 599

April 26, 20126 states

The Storm Prediction Center issued this mesoscale discussion at Apr 26, 2012, 8:41 PM MDT for 6 states. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued: Apr 26, 2012, 8:41 PM MDT (02:41 UTC)
Expired: Apr 26, 2012, 10:45 PM MDT
In force: 2 hr
Issued by: the Storm Prediction Center

All 47 counties

Adams County, CO, Arapahoe County, CO, Baca County, CO, Bent County, CO, Broomfield County, CO, Cheyenne County, CO, Crowley County, CO, Denver County, CO, Douglas County, CO, El Paso County, CO, Elbert County, CO, Jefferson County, CO, Kiowa County, CO, Kit Carson County, CO, Las Animas County, CO, Lincoln County, CO, Logan County, CO, Morgan County, CO, Otero County, CO, Phillips County, CO, Prowers County, CO, Pueblo County, CO, Sedgwick County, CO, Teller County, CO, Washington County, CO, Weld County, CO, Yuma County, CO, Cheyenne County, KS, Grant County, KS, Greeley County, KS, Hamilton County, KS, Kearny County, KS, Logan County, KS, Morton County, KS, Sherman County, KS, Stanton County, KS, Stevens County, KS, Thomas County, KS, Wallace County, KS, Wichita County, KS, Chase County, NE, Dundy County, NE, Union County, NM, Cimarron County, OK, Texas County, OK, Dallam County, TX, Sherman County, TX

The radar

The Pueblo radar (KPUX), 122 km from the middle of the area, began a volume at 02:44 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 193Apr 26, 9:05 PM MDT

The nearest sounding before it

Denver, CO (KDNR), launched 00:00Z, 2.7 hours before the alert went out and 144 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: 95 J/kg
Mixed-layer CIN: -85 J/kg
Mixed-layer LCL: 2538 m above ground
0-6 km bulk shear: 28 kt
0-1 km storm-relative helicity: 42 m²/s²
0-3 km storm-relative helicity: 175 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.

952 
ACUS11 KWNS 270242
SWOMCD
SPC MCD 270241
KSZ000-NEZ000-OKZ000-TXZ000-COZ000-NMZ000-270445-

MESOSCALE DISCUSSION 0599
NWS STORM PREDICTION CENTER NORMAN OK
0941 PM CDT THU APR 26 2012

AREAS AFFECTED...MUCH OF ERN CO...WRN KS...SWRN NEB...WRN OK/TX
PANHANDLES...FAR NERN NM

CONCERNING...SEVERE POTENTIAL...WATCH LIKELY

VALID 270241Z - 270445Z

A THREAT OF SEVERE WIND AND MARGINAL HAIL IS EXPECTED TO DEVELOP
LATER THIS EVENING INTO THE OVERNIGHT PERIOD...AND A WATCH IS
LIKELY.

SATELLITE SHOWS A POTENT VORT MAX MOVING NEWD ACROSS NM AND CO WITH
A TIGHT TEMPERATURE GRADIENT WITH A DEEP COLD FRONT. WINDS WERE
GUSTING OVER 50 KT OVER NRN NM RECENTLY WITH THE FRONT.

IN THE WAKE OF EARLIER CONVECTION...SELY FLOW WILL MAINTAIN A FEED
OF MOISTURE...PERHAPS ELEVATED OVER EARLIER OUTFLOW...NWWD INTO ERN
CO AHEAD OF THE SHORTWAVE TROUGH. WITH STRONG FORCING AND COOLING
ALOFT...A LINE OF STORMS IS LIKELY ALONG THE COLD FRONT...CAPABLE OF
DAMAGING WINDS AND SOME HAIL.

..JEWELL.. 04/27/2012

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

ATTN...WFO...LBF...DDC...GLD...AMA...PUB...BOU...ABQ...

LAT...LON   39010098 37430095 36550121 36080199 35840277 36200344
            37240443 38290530 39680530 40670526 40960391 40960232
            40950178 40450132 39010098

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 26, 9:00 PM MDT	Severe Thunderstorm Watch	SPC	Baca, Bent, Cheyenne, Crowley, Elbert, Kiowa and 11 more	7 hr
Apr 27, 1:24 AM MDT	Mesoscale Discussion	SPC	Baca, Bent, Cheyenne, Crowley, Kiowa, Kit Carson and 7 more	2 hr
Apr 27, 3:43 AM MDT	Mesoscale Discussion	SPC	Cheyenne, Kit Carson, Yuma	32 min
Apr 27, 5:16 AM MDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Chase, Coffey and 22 more	59 min
Apr 27, 9:15 AM MDT	Mesoscale Discussion	SPC	Barber, Barton, Butler, Cowley, Dickinson, Ellis and 21 more	2 hr
Apr 27, 12:29 PM MDT	Mesoscale Discussion	SPC	Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 34 more	91 min
Apr 27, 1:11 PM MDT	Tornado Watch	SPC	Allen, Anderson, Bourbon, Butler, Chase, Chautauqua and 46 more	7 hr
Apr 27, 2:44 PM MDT	Mesoscale Discussion	SPC	Allen, Anderson, Butler, Chase, Chautauqua, Clay and 22 more	61 min
Apr 27, 5:07 PM MDT	Mesoscale Discussion	SPC	Allen, Anderson, Atchison, Bourbon, Brown, Cherokee and 32 more	113 min

Nearby

Mesoscale Discussions in Colorado, 2012 Mesoscale Discussions in Kansas, 2012 Mesoscale Discussions in Nebraska, 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.