Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 500
The Storm Prediction Center issued this mesoscale discussion at Apr 12, 2012, 3:34 PM CDT for 13 counties in Oklahoma; 5 counties in Texas. It was in force for 86 min.
The area
The outline as issued.
The facts
- Issued
- Apr 12, 2012, 3:34 PM CDT (20:34 UTC)
- Expired
- Apr 12, 2012, 5:00 PM CDT
- In force
- 86 min
- Issued by
- the Storm Prediction Center
Counties Beckham County, OK, Caddo County, OK, Comanche County, OK, Custer County, OK, Dewey County, OK, Ellis County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kiowa County, OK, Roger Mills County, OK, Tillman County, OK, Washita County, OK, Childress County, TX, Collingsworth County, TX, Foard County, TX, Hardeman County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 65 km from the middle of the area, began a volume at 20:37 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
Norman, OK (KOUN), launched 12:00Z, 8.6 hours before the alert went out and 184 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.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 602 m above ground
- 0-6 km bulk shear
- 22 kt
- 0-1 km storm-relative helicity
- 273 m²/s²
- 0-3 km storm-relative helicity
- 340 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
332
ACUS11 KWNS 122034
SWOMCD
SPC MCD 122034
OKZ000-TXZ000-122200-
MESOSCALE DISCUSSION 0500
NWS STORM PREDICTION CENTER NORMAN OK
0334 PM CDT THU APR 12 2012
AREAS AFFECTED...NWRN TX THROUGH WRN OK
CONCERNING...SEVERE POTENTIAL...WATCH POSSIBLE
VALID 122034Z - 122200Z
SEVERE STORMS COULD DEVELOP FROM NWRN TX THROUGH WRN OK DURING NEXT
FEW HOURS. SUPERCELLS CAPABLE OF VERY LARGE HAIL AND ISOLATED
TORNADOES WILL BE THE MAIN THREATS.
THE ATMOSPHERE HAS DESTABILIZED IN MOIST AXIS EAST OF THE DRYLINE
FROM WRN TX NWD THROUGH WRN OK WITH MLCAPE TO 2000 J/KG AND 7.5 C/KM
MID LEVEL LAPSE RATES. A WEAK BOUNDARY WAS ALSO INDICATED FROM
N-CNTRL NWWD THROUGH NWRN TX ALONG THE OK/TX BORDER. NORTH OF THIS
FEATURE WINDS ARE BACKED ESELY RESULTING IN 200-250 M2/S2 EFFECTIVE
STORM RELATIVE HELICITY. LOW CLOUDS CONTINUE TO DIMINISH FROM THE
WEST WITHIN ZONE OF DEEPER MIXING ACROSS NWRN TX WHERE A FIELD OF
CUMULUS AND A FEW SHOWERS HAVE DEVELOPED. ISOLATED STORMS MAY
EVENTUALLY FORM WHERE THIS ZONE INTERSECTS THE BOUNDARY FROM NWRN TX
INTO SWRN OK. EFFECTIVE BULK SHEAR FROM 40-45 KT FAVORS
SUPERCELLS...AND 0-1 KM HODOGRAPH SIZE WILL INCREASE FURTHER AS THE
LOW LEVEL JET STRENGTHENS DURING THE EVENING.
..DIAL.. 04/12/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...LUB...AMA...
LAT...LON 33729922 34000014 35000038 36469965 36389880 34659820
33729922SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 2:28 PM CDT | Mesoscale Discussion | SPC | Beaver, Texas | 2 hr |
| Apr 12, 6:06 PM CDT | Mesoscale Discussion | SPC | Beckham, Greer, Harmon, Jackson, Kiowa, Roger Mills and 1 more | 114 min |
| Apr 11, 8:54 PM CDT | Mesoscale Discussion | SPC | Armstrong, Carson, Donley, Gray, Hansford, Hartley and 8 more | 66 min |
| Apr 11, 9:12 PM CDT | Mesoscale Discussion | SPC | Andrews, Cochran, Crane, Dawson, Ector, Gaines and 16 more | 93 min |
Nearby
Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Texas, 2012Every 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.