Alert archive / Nebraska / Mesoscale Discussions in 2011

Mesoscale Discussion 1303

June 19, 201113 counties in Nebraska

The Storm Prediction Center issued this mesoscale discussion at Jun 19, 2011, 5:58 PM CDT for 13 counties in Nebraska. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued: Jun 19, 2011, 5:58 PM CDT (22:58 UTC)
Expired: Jun 19, 2011, 7:30 PM CDT
In force: 92 min
Issued by: the Storm Prediction Center

Counties Buffalo County, NE, Chase County, NE, Custer County, NE, Dawson County, NE, Dundy County, NE, Frontier County, NE, Gosper County, NE, Hayes County, NE, Lincoln County, NE, Logan County, NE, Perkins County, NE, Phelps County, NE, Sherman County, NE

The radar

The North Platte radar (KLNX), 104 km from the middle of the area, began a volume at 23:00 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.

The nearest sounding before it

N. Platte/Lee Bi, NE (KLBF), launched 12:00Z, 11.0 hours before the alert went out and 34 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: 324 J/kg
Mixed-layer CIN: -277 J/kg
Mixed-layer LCL: 1660 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 19 m²/s²
0-3 km storm-relative helicity: -18 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

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

609 
ACUS11 KWNS 192258
SWOMCD
SPC MCD 192258 
NEZ000-200030-

MESOSCALE DISCUSSION 1303
NWS STORM PREDICTION CENTER NORMAN OK
0558 PM CDT SUN JUN 19 2011

AREAS AFFECTED...PARTS OF CNTRL/SRN NEB

CONCERNING...SEVERE THUNDERSTORM WATCH 513...

VALID 192258Z - 200030Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 513
CONTINUES.

A NEW WW EAST OF WW 513 WILL BE ISSUED SHORTLY.

NEW VIGOROUS CONVECTIVE DEVELOPMENT NOW APPEARS UNDERWAY WITHIN A
ZONE OF ENHANCED LOW/MID-LEVEL WARM ADVECTION DOWNSTREAM OF THE
EVOLVING CLUSTER OF STORMS ACROSS NORTHEAST COLORADO AND THE
SOUTHERN NEBRASKA PANHANDLE.  IN THE PRESENCE OF MODERATELY STRONG
SHEAR AND INSTABILITY...A FEW SEVERE STORMS APPEAR LIKELY THROUGH
00-02Z...BEFORE UPSTREAM CLUSTER BEGINS TO ACCELERATE EASTWARD
TOWARD THE REGION.

..KERR.. 06/19/2011

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

ATTN...WFO...GID...LBF...GLD...

LAT...LON   41830058 41729941 41439904 41099855 40329911 40280094
            40150180 40960176 41830058

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 18, 8:54 PM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Dawson, Fillmore, Franklin and 11 more	66 min
Jun 18, 9:25 PM CDT	Severe Thunderstorm Watch	SPC	Adams, Clay, Fillmore, Hall, Hamilton, Howard and 6 more	4 hr
Jun 19, 2:09 PM CDT	Mesoscale Discussion	SPC	Arthur, Chase, Cheyenne, Deuel, Dundy, Garden and 3 more	2 hr
Jun 19, 3:04 PM CDT	Tornado Watch	SPC	Arthur, Banner, Chase, Cheyenne, Deuel, Dundy and 7 more	7 hr
Jun 19, 3:52 PM CDT	Mesoscale Discussion	SPC	Adams, Buffalo, Clay, Dawson, Fillmore, Franklin and 18 more	113 min
Jun 19, 5:49 PM CDT	Mesoscale Discussion	SPC	Boyd, Holt, Knox, Rock	56 min
Jun 19, 6:10 PM CDT	Tornado Watch	SPC	Antelope, Blaine, Boone, Boyd, Brown, Buffalo and 36 more	7 hr
Jun 19, 6:21 PM CDT	Mesoscale Discussion	SPC	Cass, Clay, Fillmore, Gage, Jefferson, Johnson and 9 more	84 min
Jun 19, 6:51 PM CDT	Tornado Watch	SPC	Cass, Gage, Jefferson, Johnson, Lancaster, Nemaha and 4 more	7 hr

Nearby

Mesoscale Discussions in Nebraska, 2011 Every mesoscale discussion 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.