Alert archive / Oklahoma / Mesoscale Discussions in 2007
Mesoscale Discussion 2213
The Storm Prediction Center issued this mesoscale discussion at Dec 12, 2007, 6:30 AM CST for 16 counties in Oklahoma. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 12, 2007, 6:30 AM CST (12:30 UTC)
- Expired
- Dec 12, 2007, 10:30 AM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Custer County, OK, Garfield County, OK, Greer County, OK, Harmon County, OK, Kay County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Noble County, OK, Pawnee County, OK, Payne County, OK, Washita County, OK
The radar
The Norman radar (KTLX), 85 km from the middle of the area, began a volume at 12:30 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
Lamont, OK (KLMN), launched 12:00Z, 0.5 hours before the alert went out and 86 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
- 1 J/kg
- Mixed-layer CIN
- 0 J/kg
- Mixed-layer LCL
- 487 m above ground
- 0-6 km bulk shear
- 88 kt
- 0-1 km storm-relative helicity
- -130 m²/s²
- 0-3 km storm-relative helicity
- -2 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 ACUS11 KWNS 121231 SWOMCD SPC MCD 121230 OKZ000-KSZ000-121630- MESOSCALE DISCUSSION 2213 NWS STORM PREDICTION CENTER NORMAN OK 0630 AM CST WED DEC 12 2007 AREAS AFFECTED...WRN AND NRN OK CONCERNING...FREEZING RAIN VALID 121230Z - 121630Z A MIXTURE OF FREEZING RAIN AND SLEET WILL BE LIKELY WITH SHOWERS MOVING NEWD ACROSS WRN AND NRN OK THIS MORNING. PRECIPITATION RATES COULD REACH A TENTH OF AN INCH PER HOUR WITH THE HEAVIER SHOWERS. THE LATEST WATER VAPOR IMAGERY SHOWS AN UPPER-LEVEL LOW OVER SE AZ WITH SOUTHWEST FLOW IN PLACE ACROSS THE SRN PLAINS. A PLUME OF MID-LEVEL MOISTURE EXTENDS NNEWD ACROSS WCNTRL TX INTO SRN OK ASSOCIATED WITH A BAND OF STRONG FLOW IN THE 700 TO 500 MB LAYER. THIS IS LIKELY WHERE WARM ADVECTION IS OCCURRING WHICH COMBINED WITH STEEP MID-LEVEL LAPSE RATES SHOULD CONTINUE TO SUPPORT CONVECTIVE-TYPE SHOWERS ACROSS WRN AND NRN OK THIS MORNING. FREEZING RAIN AND SLEET WILL BE LIKELY WITH AREAS IN THE PATH OF THE HEAVIER SHOWERS RECEIVING PRECIPITATION RATES UP TO A TENTH OF AN INCH PER HOUR. THE FREEZING LINE SHOULD GRADUALLY MOVE NWWD THIS MORNING ALLOWING FOR A CHANGEOVER TO RAIN IN THE SERN FRINGE OF THE MD AREA. ..BROYLES.. 12/12/2007 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ...NOTICE... SPC WINTER WEATHER MESOSCALE DISCUSSIONS WILL BE ISSUED ON A SCHEDULED BASIS FROM DECEMBER 1 THROUGH FEBRUARY 28...FOUR TIMES A DAY...AROUND 00 UTC...06 UTC...12 UTC...AND 18 UTC FOR SIGNIFICANT SHORT RANGE WINTER WEATHER EVENTS. ATTN...WFO...TSA...ICT...OUN... 35439764 35009846 34619956 34769999 35399994 36269843 36949753 37049699 36969664 36719645 36399650 36009683
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 12, 1:04 AM CST | Mesoscale Discussion | SPC | Carter, Comanche, Cotton, Garvin, Jefferson, Murray and 2 more | 6 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2007Every mesoscale discussion in 2007
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.