Alert archive / Oklahoma / Mesoscale Discussions in 2013
Mesoscale Discussion 607
The Storm Prediction Center issued this mesoscale discussion at May 9, 2013, 12:53 AM CDT for 18 counties in Oklahoma. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- May 9, 2013, 12:53 AM CDT (05:53 UTC)
- Expired
- May 9, 2013, 3:00 AM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
- Chance of a watch
- 20%
Counties Blaine County, OK, Caddo County, OK, Canadian County, OK, Cleveland County, OK, Creek County, OK, Custer County, OK, Garfield County, OK, Grady County, OK, Kingfisher County, OK, Lincoln County, OK, Logan County, OK, McClain County, OK, Noble County, OK, Oklahoma County, OK, Pawnee County, OK, Payne County, OK, Pottawatomie County, OK, Washita County, OK
The radar
The Norman radar (KTLX), 65 km from the middle of the area, began a volume at 05:54 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 00:00Z, 5.9 hours before the alert went out and 67 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
- 3283 m above ground
- 0-6 km bulk shear
- 36 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 113 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
477
ACUS11 KWNS 090554
SWOMCD
SPC MCD 090553
OKZ000-090800-
MESOSCALE DISCUSSION 0607
NWS STORM PREDICTION CENTER NORMAN OK
1253 AM CDT THU MAY 09 2013
AREAS AFFECTED...N CNTRL OK
CONCERNING...SEVERE POTENTIAL...WATCH UNLIKELY
VALID 090553Z - 090800Z
PROBABILITY OF WATCH ISSUANCE...20 PERCENT
SUMMARY...THUNDERSTORMS ARE EXPECTED TO MOVE FROM NWRN INTO N CNTRL
OK TONIGHT...WITH MARGINAL HAIL OR WIND EXPECTED. THE THREAT DOES
NOT CURRENTLY NECESSITATE A WATCH.
DISCUSSION...STORMS HAVE RECENTLY INCREASED ALONG THE COLD FRONT
OVER NWRN OK. MEANWHILE...MUCH OF THE SURFACE AIR MASS HAS BEEN
STABILIZED ACROSS CNTRL OK IN THE WAKE OF EARLIER CONVECTION...NOW A
DYING MCS ACROSS NERN OK.
A STRONG SLY LOW LEVEL JET PERSISTS...WHICH IS HELPING TO MAINTAIN
AN ELEVATED FEED OF MOISTURE AND INSTABILITY ATOP OF OUTFLOW
BOUNDARY WHICH EXTENDED FROM W CNTRL INTO S CNTRL OK. THE COOL AIR
ALOFT WOULD TEND TO FAVOR A FEW HAIL CORES...BUT MARGINAL DEEP LAYER
SHEAR AND DECREASING ELEVATED INSTABILITY WITH TIME SHOULD MITIGATE
ANY SEVERE WIND THREAT.
..JEWELL/KERR.. 05/09/2013
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...TSA...OUN...
LAT...LON 35599926 35799921 36499823 36579740 36409660 36039629
35579626 35189657 34969747 35079833 35289903 35599926SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 8:56 PM CDT | Mesoscale Discussion | SPC | Alfalfa, Blaine, Caddo, Canadian, Carter, Cleveland and 27 more | 94 min |
| May 9, 5:38 PM CDT | Mesoscale Discussion | SPC | Beckham, Caddo, Comanche, Greer, Harmon, Jackson and 2 more | 67 min |
Nearby
Mesoscale Discussions in Oklahoma, 2013Every mesoscale discussion in 2013
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.