Alert archive / Oklahoma / Mesoscale Discussions in 2014

Mesoscale Discussion 1237

June 30, 2014Barber County, Kansas; Ellis County, Woods County, Woodward County, Oklahoma; Hemphill County, Roberts County, Texas

The Storm Prediction Center issued this mesoscale discussion at Jun 30, 2014, 11:38 PM CDT for Barber County, Kansas; Ellis County, Woods County, Woodward County, Oklahoma; Hemphill County, Roberts County, Texas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued: Jun 30, 2014, 11:38 PM CDT (04:38 UTC)
Expired: Jul 1, 2014, 12:45 AM CDT
In force: 67 min
Issued by: the Storm Prediction Center

Counties Barber County, KS, Ellis County, OK, Woods County, OK, Woodward County, OK, Hemphill County, TX, Roberts County, TX

The radar

The Vance AFB radar (KVNX), 153 km from the middle of the area, began a volume at 04:39 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 nearest sounding before it

Dodge City, (KDDC), launched 00:00Z, 4.6 hours before the alert went out and 155 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: 2699 J/kg
Mixed-layer CIN: -97 J/kg
Mixed-layer LCL: 1994 m above ground
0-6 km bulk shear: 36 kt
0-1 km storm-relative helicity: 29 m²/s²
0-3 km storm-relative helicity: 154 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 6.6

Open this sounding in Storm Lab

The text

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

538 
ACUS11 KWNS 010438
SWOMCD
SPC MCD 010438 
KSZ000-OKZ000-TXZ000-010545-

MESOSCALE DISCUSSION 1237
NWS STORM PREDICTION CENTER NORMAN OK
1138 PM CDT MON JUN 30 2014

AREAS AFFECTED...NE TX PANHANDLE...NW OK...SW KS

CONCERNING...SEVERE THUNDERSTORM WATCH 377...

VALID 010438Z - 010545Z

THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 377
CONTINUES.

SUMMARY...THUNDERSTORMS WILL SPREAD SEWD OUT OF WW 377 IN THE NEXT
HOUR.  HOWEVER...A LOCAL EXTENSION IN SPACE OR TIME MAY NOT BE
NEEDED SINCE INSTABILITY WEAKENS QUICKLY TO THE SE...WHICH SUGGESTS
THAT THE SEVERE THREAT WILL WANE.

DISCUSSION...THE EARLIER FRONTAL CONVECTION AND SE CO CLUSTER HAVE
NOW MOVED SEWD INTO THE NE TX PANHANDLE AND NW OK...WITH MEASURED
SEVERE GUSTS OF 59 MPH AT GOODWELL...74 MPH AT SLAPOUT...AND 85 MPH
AT BEAVER IN THE OK PANHANDLE IN THE PAST HOUR.  HOWEVER...RADAR 
SUGGESTS THAT THE STORMS HAVE ALREADY PASSED PEAK INTENSITY...AND A
DRIER LOW-LEVEL AIR MASS IN ADVANCE OF THE STORMS IS LIMITING
BUOYANCY AND SHOULD RESULT IN ADDITIONAL WEAKENING OF THE STORMS AS
THEY MOVE SEWD OUT OF THE WATCH AREA.  WHILE ISOLATED SEVERE GUSTS
AND HAIL WILL BE POSSIBLE IN THE SHORT TERM...LOCAL EXTENSIONS OF
THE WATCH IN SPACE/TIME MAY NOT BE NECESSARY...AND THE WATCH WILL
LIKELY BE ALLOWED TO EXPIRE AS SCHEDULED AT 05Z.

..THOMPSON.. 07/01/2014

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

ATTN...WFO...OUN...DDC...AMA...

LAT...LON   35829990 35560075 35560135 35790140 36310008 36929952
            37279890 37409851 37189835 36579899 35829990

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 30, 7:48 PM CDT	Mesoscale Discussion	SPC	Atchison	57 min
Jun 30, 8:17 PM CDT	Severe Thunderstorm Watch	SPC	Anderson, Butler, Chase, Coffey, Cowley, Douglas and 20 more	6 hr
Jun 30, 9:38 PM CDT	Mesoscale Discussion	SPC	Barber, Butler, Chase, Clark, Comanche, Greenwood and 9 more	67 min
Jun 30, 10:14 PM CDT	Mesoscale Discussion	SPC	Johnson	61 min
Jul 1, 4:29 PM CDT	Mesoscale Discussion	SPC	Atoka, Bryan, Carter, Choctaw, Coal, Cotton and 16 more	3 hr
Jul 1, 4:50 PM CDT	Mesoscale Discussion	SPC	Andrews, Borden, Dawson, Ector, El Paso, Gaines and 8 more	2 hr

Nearby

Mesoscale Discussions in Oklahoma, 2014 Mesoscale Discussions in Texas, 2014 Mesoscale Discussions in Kansas, 2014 Every mesoscale discussion in 2014

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.