Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 2216
The Storm Prediction Center issued this mesoscale discussion at Dec 25, 2012, 2:50 PM CST for 12 counties in Oklahoma; Clay County, Wichita County, Wilbarger County, Texas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Dec 25, 2012, 2:50 PM CST (20:50 UTC)
- Expired
- Dec 25, 2012, 6:45 PM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Beckham County, OK, Caddo County, OK, Comanche County, OK, Cotton County, OK, Custer County, OK, Greer County, OK, Jackson County, OK, Jefferson County, OK, Kiowa County, OK, Stephens County, OK, Tillman County, OK, Washita County, OK, Clay County, TX, Wichita County, TX, Wilbarger County, TX
The radar
The Altus AFB radar (KFDR), 31 km from the middle of the area, began a volume at 20:47 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, 8.8 hours before the alert went out and 142 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
- 524 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 312 m²/s²
- 0-3 km storm-relative helicity
- 223 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
600
ACUS11 KWNS 252050
SWOMCD
SPC MCD 252050
OKZ000-TXZ000-260045-
MESOSCALE DISCUSSION 2216
NWS STORM PREDICTION CENTER NORMAN OK
0250 PM CST TUE DEC 25 2012
AREAS AFFECTED...SWRN/S-CNTRL OK AND WRN N TX
CONCERNING...BLIZZARD
VALID 252050Z - 260045Z
SUMMARY...BLIZZARD CONDITIONS WILL CONTINUE THROUGH AROUND 22Z-00Z
BEFORE WIND SPEEDS AND SNOW RATES BEGIN DECREASING.
HOWEVER...BLOWING/DRIFTING SNOW WILL REMAIN A CONCERN INTO TONIGHT.
DISCUSSION...SFC OBSERVATIONS SUGGEST THAT NLY WINDS OF 20-35 MPH
WITH GUSTS REACHING 35-45 MPH ARE OCCURRING IN ASSOCIATION WITH A
TIGHT SFC PRESSURE GRADIENT. THESE WINDS ARE COMBINING WITH FALLING
SNOW/FRESHLY FALLEN SNOW TO CREATE WIDESPREAD VISIBILITIES BELOW
0.75 MILE...WITH VISIBILITIES AOB 0.25 MILE ALSO OCCURRING. THE BAND
OF HEAVIEST SNOW EXTENDS FROM 25 NW LTS TO 15 S FSI TO 20 WSW ADM AS
OF AROUND 2040Z...AND THIS BAND WILL CONTINUE SHIFTING SWD TOWARD
AND S OF THE RED RIVER DURING THE NEXT COUPLE OF HOURS.
HOWEVER...WITH FORCING FOR ASCENT WEAKENING WITH TIME...SNOWFALL
RATES SHOULD DECREASE DURING THE 22Z-00Z TIME PERIOD. WIND SPEEDS
WILL ALSO DECREASE DURING THIS SAME TIME PERIOD...AS THE SFC
PRESSURE GRADIENT SLACKENS. THESE FACTORS WILL SERVE TO DECREASE THE
BLIZZARD THREAT LATE THIS AFTERNOON INTO THE EVENING...THOUGH
BLOWING/DRIFTING OF FRESHLY FALLEN SNOW WILL LIKELY CONTINUE INTO
TONIGHT AS NLY WINDS OF 15-25 MPH WITH HIGHER GUSTS CONTINUE.
..COHEN.. 12/25/2012
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...FWD...OUN...
LAT...LON 33689841 33959915 34389974 35049984 35389968 35759911
35119804 34519738 33879739 33689841SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 25, 2:32 AM CST | Mesoscale Discussion | SPC | Blaine, Caddo, Canadian, Cleveland, Comanche, Creek and 21 more | 4 hr |
| Dec 25, 9:31 AM CST | Mesoscale Discussion | SPC | Caddo, Canadian, Carter, Comanche, Cotton, Garvin and 9 more | 5 hr |
| Dec 25, 11:02 AM CST | Mesoscale Discussion | SPC | Caddo, Carter, Comanche, Cotton, Garvin, Grady and 7 more | 4 hr |
| Dec 25, 12:11 PM CST | Mesoscale Discussion | SPC | Atoka, Bryan, Choctaw, Coal, Haskell, Johnston and 6 more | 5 hr |
| Dec 25, 1:01 AM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Austin, Bell, Bosque, Brazos and 37 more | 59 min |
| Dec 25, 1:37 AM CST | Severe Thunderstorm Watch | SPC | Anderson, Angelina, Bell, Bosque, Brazos, Burleson and 36 more | 7 hr |
| Dec 25, 5:56 AM CST | Mesoscale Discussion | SPC | Anderson, Angelina, Bell, Bosque, Brazos, Burleson and 38 more | 94 min |
| Dec 25, 7:00 AM CST | Mesoscale Discussion | SPC | Brazoria, Chambers, Galveston, Hardin, Harris, Jasper and 9 more | 60 min |
| Dec 25, 8:46 AM CST | Mesoscale Discussion | SPC | Angelina, Brazoria, Chambers, Cherokee, Fort Bend, Galveston and 26 more | 59 min |
| Dec 25, 9:02 AM CST | Severe Thunderstorm Watch | SPC | Angelina, Cherokee, Gregg, Harrison, Marion, Nacogdoches and 6 more | 7 hr |
| Dec 25, 9:17 AM CST | Tornado Watch | SPC | Austin, Brazoria, Chambers, Fort Bend, Galveston, Grimes and 16 more | 8 hr |
| Dec 25, 12:19 PM CST | Mesoscale Discussion | SPC | Chambers, Galveston, Hardin, Jasper, Jefferson, Newton and 1 more | 71 min |
| Dec 25, 1:00 PM CST | Mesoscale Discussion | SPC | Bowie, Camp, Cass, Collin, Dallas, Delta and 16 more | 5 hr |
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.