Alert archive / Oklahoma / Mesoscale Discussions in 2012
Mesoscale Discussion 435
The Storm Prediction Center issued this mesoscale discussion at Apr 3, 2012, 3:05 PM CDT for 8 counties in Arkansas; 11 counties in Oklahoma; Grayson County, Lamar County, Red River County, Texas. It was in force for 85 min.
The area
The outline as issued.
The facts
- Issued
- Apr 3, 2012, 3:05 PM CDT (20:05 UTC)
- Expired
- Apr 3, 2012, 4:30 PM CDT
- In force
- 85 min
- Issued by
- the Storm Prediction Center
All 22 counties
Hempstead County, AR, Howard County, AR, Little River County, AR, Montgomery County, AR, Nevada County, AR, Pike County, AR, Polk County, AR, Sevier County, AR, Atoka County, OK, Bryan County, OK, Carter County, OK, Choctaw County, OK, Coal County, OK, Johnston County, OK, Love County, OK, Marshall County, OK, McCurtain County, OK, Murray County, OK, Pushmataha County, OK, Grayson County, TX, Lamar County, TX, Red River County, TX
The radar
The Western Arkansas radar (KSRX), 177 km from the middle of the area, began a volume at 20:05 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Fort Worth, TX (KFWD), launched 12:00Z, 8.1 hours before the alert went out and 211 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
- 1939 J/kg
- Mixed-layer CIN
- -2 J/kg
- Mixed-layer LCL
- 469 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 109 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.6
- Supercell composite
- 2.8
The text
As transmitted, in the capitals the NWS used until 2016.
816 ACUS11 KWNS 032006 SWOMCD SPC MCD 032005 ARZ000-TXZ000-OKZ000-032130- MESOSCALE DISCUSSION 0435 NWS STORM PREDICTION CENTER NORMAN OK 0305 PM CDT TUE APR 03 2012 AREAS AFFECTED...SRN OK INTO THE RED RIVER VALLEY AREA OF N TX...AND EWD INTO SWRN AR CONCERNING...SEVERE THUNDERSTORM WATCH 132... VALID 032005Z - 032130Z THE SEVERE WEATHER THREAT FOR SEVERE THUNDERSTORM WATCH 132 CONTINUES. SEVERE THREAT CONTINUES ACROSS WW 132 AS STORMS CONTINUE SPREADING NEWD WITH TIME. NEW WW MAY BE REQUIRED TO EXTEND THE AREA IN BOTH TIME AND SPACE. CONVECTION CONTINUES ATTM ACROSS THE WRN HALF OF WATCH 132...WHILE DOWNSTREAM INTO ERN OK/SWRN AR...HEATING/DESTABILIZATION CONTINUES. THIS HEATING/DESTABILIZING AIRMASS SHOULD SUPPORT CONTINUATION OF THE SEVERE STORMS/SUPERCELLS NOW ONGOING ACROSS N CENTRAL TX...AS THEY SPREAD NEWD ACROSS THE RED RIVER VALLEY WITH TIME. WITH WW 132 SET TO EXPIRE AT 03/22Z BUT THREAT LIKELY TO CONTINUE -- AND INCREASE EWD IN AREA...NEW WW WILL LIKELY BE ISSUED WITHIN THE NEXT HOUR TO COVER THE CONTINUING/EXPANDING THREAT. ..GOSS.. 04/03/2012 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...LZK...SHV...TSA...FWD...OUN... LAT...LON 33669767 34479788 34919349 33879318 33479318 33669767
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 3, 1:42 PM CDT | Mesoscale Discussion | SPC | Chicot | 93 min |
| Apr 3, 2:22 PM CDT | Severe Thunderstorm Watch | SPC | Columbia, Hempstead, Lafayette, Nevada, Union | 8 hr |
| Apr 3, 2:36 PM CDT | Tornado Watch | SPC | Howard, Little River, Miller, Sevier | 7 hr |
| Apr 3, 3:43 PM CDT | Severe Thunderstorm Watch | SPC | Boone, Bradley, Calhoun, Clark, Crawford, Dallas and 16 more | 6 hr |
| Apr 3, 5:00 PM CDT | Mesoscale Discussion | SPC | Little River, Miller | 60 min |
| Apr 3, 5:24 PM CDT | Mesoscale Discussion | SPC | Ashley, Chicot, Union | 66 min |
| Apr 3, 6:53 PM CDT | Mesoscale Discussion | SPC | Columbia, Hempstead, Lafayette, Little River, Miller, Nevada and 1 more | 67 min |
| Apr 2, 7:17 PM CDT | Mesoscale Discussion | SPC | Beaver, Ellis, Harper, Roger Mills, Texas | 58 min |
| Apr 2, 9:12 PM CDT | Mesoscale Discussion | SPC | Beaver, Beckham, Caddo, Comanche, Cotton, Custer and 13 more | 63 min |
| Apr 2, 10:51 PM CDT | Severe Thunderstorm Watch | SPC | Alfalfa, Blaine, Caddo, Canadian, Comanche, Cotton and 14 more | 5 hr |
| Apr 3, 1:14 AM CDT | Mesoscale Discussion | SPC | Carter, Cleveland, Comanche, Cotton, Garfield, Garvin and 12 more | 2 hr |
| Apr 3, 3:32 AM CDT | Mesoscale Discussion | SPC | Caddo, Canadian, Comanche, Cotton, Grady, Jefferson and 2 more | 88 min |
| Apr 3, 8:36 AM CDT | Mesoscale Discussion | SPC | Bryan, Carter, Jefferson, Johnston, Love, Marshall and 2 more | 84 min |
| Apr 3, 9:18 AM CDT | Severe Thunderstorm Watch | SPC | Atoka, Bryan, Carter, Choctaw, Coal, Jefferson and 5 more | 8 hr |
| Apr 3, 11:47 AM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Jefferson, Johnston and 3 more | 118 min |
| Apr 3, 2:21 PM CDT | Mesoscale Discussion | SPC | Atoka, Bryan, Carter, Choctaw, Johnston, Love and 2 more | 84 min |
| Apr 2, 11:45 PM CDT | Mesoscale Discussion | SPC | Brown, Callahan, Coleman, Comanche, Concho, Eastland and 17 more | 2 hr |
| Apr 3, 12:08 PM CDT | Tornado Watch | SPC | Anderson, Bell, Bosque, Collin, Coryell, Dallas and 30 more | 9 hr |
| Apr 3, 1:12 PM CDT | Mesoscale Discussion | SPC | Bosque, Collin, Dallas, Denton, Ellis, Erath and 16 more | 93 min |
| Apr 3, 1:46 PM CDT | Mesoscale Discussion | SPC | Camp, Cass, Cherokee, Franklin, Gregg, Harrison and 9 more | 89 min |
| Apr 3, 4:38 PM CDT | Mesoscale Discussion | SPC | Austin, Bastrop, Brazos, Burleson, Caldwell, Fayette and 10 more | 67 min |
Nearby
Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Arkansas, 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.