Alert archive / Oklahoma / Mesoscale Discussions in 2011
Mesoscale Discussion 98
The Storm Prediction Center issued this mesoscale discussion at Feb 8, 2011, 10:45 PM CST for 18 counties in Oklahoma; 4 counties in Texas. It was in force for 3 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 8, 2011, 10:45 PM CST (04:45 UTC)
- Expired
- Feb 9, 2011, 1:45 AM CST
- In force
- 3 hr
- Issued by
- the Storm Prediction Center
All 22 counties
Beckham County, OK, Blaine County, OK, Caddo County, OK, Canadian County, OK, Comanche County, OK, Custer County, OK, Dewey County, OK, Garfield County, OK, Greer County, OK, Harmon County, OK, Jackson County, OK, Kingfisher County, OK, Kiowa County, OK, Logan County, OK, Major County, OK, Oklahoma County, OK, Roger Mills County, OK, Washita County, OK, Childress County, TX, Collingsworth County, TX, Donley County, TX, Wheeler County, TX
The radar
The Altus AFB radar (KFDR), 111 km from the middle of the area, began a volume at 04:51 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, 4.8 hours before the alert went out and 168 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
- 1114 m above ground
- 0-6 km bulk shear
- 103 kt
- 0-1 km storm-relative helicity
- 342 m²/s²
- 0-3 km storm-relative helicity
- 753 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
740
ACUS11 KWNS 090445
SWOMCD
SPC MCD 090445
OKZ000-TXZ000-090745-
MESOSCALE DISCUSSION 0098
NWS STORM PREDICTION CENTER NORMAN OK
1045 PM CST TUE FEB 08 2011
AREAS AFFECTED...THE TX PANHANDLE AND WESTERN/CNTRL OKLAHOMA
CONCERNING...HEAVY SNOW
VALID 090445Z - 090745Z
MODELS SUGGEST THAT FRONTOGENETIC FORCING ACROSS THE SOUTH CENTRAL
PLAINS WILL TEND TO WEAKEN OVERNIGHT...AND THE POTENTIAL FOCUS FOR
SUSTAINED HEAVY SNOW BANDS IS NOT CLEAR. HOWEVER...GUIDANCE DOES
APPEAR SIMILAR IN DEVELOPING/MAINTAINING AN AREA OF STRONG UPWARD
VERTICAL MOTION IN THE 700 TO 500 MB LAYER ACROSS THE WEST CENTRAL
OKLAHOMA DURING THE 06-09Z TIME FRAME. THIS COINCIDES WITH THE
MIXED PHASE LAYER FAVORABLE FOR LARGE DENDRITIC ICE CRYSTAL
GROWTH...WHICH PROBABLY WILL PROMOTE HEAVY SNOW RATES IN EXCESS OF 1
INCH PER HOUR...PERHAPS UP TO 2 INCHES PER HOUR...PARTICULARLY AS
HIGHER PRECIPITABLE WATER CONTINUES TO ADVECT NORTHWARD INTO THE
REGION. HEAVIEST SNOW RATES MAY NOT IMPACT THE OKLAHOMA CITY
METROPOLITAN AREA...ESPECIALLY DOWNTOWN AND SOUTHEASTERN
SECTIONS...UNTIL CLOSER TO 09Z.
..KERR.. 02/09/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...OUN...LUB...AMA...
LAT...LON 35500050 36279953 36419773 35769704 35019798 34549865
34419951 34640176 35500050SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 8, 7:16 PM CST | Mesoscale Discussion | SPC | Beckham, Blaine, Custer, Dewey, Ellis, Greer and 4 more | 3 hr |
| Feb 9, 2:33 AM CST | Mesoscale Discussion | SPC | Bryan, Choctaw | 4 hr |
| Feb 9, 3:29 AM CST | Mesoscale Discussion | SPC | Adair, Atoka, Canadian, Cherokee, Cleveland, Coal and 36 more | 6 hr |
| Feb 9, 10:03 AM CST | Mesoscale Discussion | SPC | Choctaw, Latimer, LeFlore, McCurtain, Pushmataha | 6 hr |
Nearby
Mesoscale Discussions in Oklahoma, 2011Mesoscale Discussions in Texas, 2011Every 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.