Alert archive / Arkansas / Mesoscale Discussions in 2011
Mesoscale Discussion 407
The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2011, 2:04 AM CDT for 23 counties in Arkansas; 20 counties in Missouri; 8 counties in Oklahoma. It was in force for 56 min.
The area
The outline as issued.
The facts
- Issued
- Apr 11, 2011, 2:04 AM CDT (07:04 UTC)
- Expired
- Apr 11, 2011, 3:00 AM CDT
- In force
- 56 min
- Issued by
- the Storm Prediction Center
All 51 counties
Baxter County, AR, Benton County, AR, Boone County, AR, Carroll County, AR, Conway County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Izard County, AR, Johnson County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Barry County, MO, Carter County, MO, Christian County, MO, Dent County, MO, Douglas County, MO, Greene County, MO, Howell County, MO, Iron County, MO, Laclede County, MO, Oregon County, MO, Ozark County, MO, Phelps County, MO, Pulaski County, MO, Reynolds County, MO, Shannon County, MO, Stone County, MO, Taney County, MO, Texas County, MO, Webster County, MO, Wright County, MO, Adair County, OK, Cherokee County, OK, Coal County, OK, Haskell County, OK, Latimer County, OK, LeFlore County, OK, Pittsburg County, OK, Sequoyah County, OK
The radar
The Springfield radar (KSGF), 127 km from the middle of the area, began a volume at 07:04 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
Springfield, MO (KSGF), launched 00:00Z, 7.1 hours before the alert went out and 110 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
- 601 J/kg
- Mixed-layer CIN
- -95 J/kg
- Mixed-layer LCL
- 1468 m above ground
- 0-6 km bulk shear
- 61 kt
- 0-1 km storm-relative helicity
- 234 m²/s²
- 0-3 km storm-relative helicity
- 188 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.1
The text
As transmitted, in the capitals the NWS used until 2016.
166
ACUS11 KWNS 110705
SWOMCD
SPC MCD 110704
MOZ000-ARZ000-OKZ000-110800-
MESOSCALE DISCUSSION 0407
NWS STORM PREDICTION CENTER NORMAN OK
0204 AM CDT MON APR 11 2011
AREAS AFFECTED...SRN MO...NRN AR...SE OK
CONCERNING...TORNADO WATCH 124...
VALID 110704Z - 110800Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 124 CONTINUES.
...ISOLD DMGG WINDS...POSSIBLE INCREASE IN AR SEVERE RISKS BY
DAYBREAK...
PRE-FRONTAL TSTMS HAVE BEEN STRUGGLING...PRESUMABLY AS THEY MOVE
INTO A REGION WHERE INFLOW TRAJECTORIES EXHIBIT INCREASING
INHIBITION. REGION IS ALSO BETWEEN THE DEPARTING MID/UPPER-LEVEL
JETSTREAK OVER THE UPPER MIDWEST AND A MODEST PV-ANOMALY BEGINNING
TO TURN NEWD IN CNTRL TX. TSTMS ARE APPROACHING ERN FRINGE OF THE
TORNADO WATCH AND ENTIRE WATCH EXPIRES AT 08Z. INDICATIONS ARE THAT
A NEW WW WILL NOT BE REQUIRED...AT LEAST RIGHT AWAY. AS THE
AFOREMENTIONED PV-ANOMALY CONTINUES NEWD TOWARD THE
ARKLATEX...STRONG-SEVERE STORMS MAY MOVE/DEVELOP ENE FROM NCNTRL TX
TOWARD CNTRL/NRN AR BY DAYBREAK. AT THAT TIME...A NEW WW MAY BE
REQUIRED FOR CNTRL/NRN AR.
..RACY.. 04/11/2011
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PAH...MEG...LSX...LZK...SGF...TSA...OUN...
LAT...LON 34309674 37329355 37919221 37819117 37669063 36979056
36399118 35549214 34769320 34619488 34309674SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 10, 7:28 PM CDT | Tornado Watch | SPC | Baxter, Benton, Boone, Carroll, Crawford, Franklin and 7 more | 8 hr |
| Apr 10, 8:52 PM CDT | Mesoscale Discussion | SPC | Benton, Boone, Carroll, Crawford, Madison, Washington | 53 min |
| Apr 11, 1:49 AM CDT | Tornado Watch | SPC | Hempstead, Howard, Lafayette, Little River, Miller, Nevada and 1 more | 4 hr |
| Apr 11, 4:19 AM CDT | Mesoscale Discussion | SPC | Calhoun, Clark, Cleburne, Cleveland, Columbia, Conway and 28 more | 56 min |
| Apr 11, 9:46 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 10 more | 29 min |
| Apr 11, 10:31 AM CDT | Tornado Watch | SPC | Arkansas, Bradley, Cleveland, Crittenden, Desha, Drew and 6 more | 6 hr |
| Apr 11, 12:37 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Cleveland, Crittenden, Desha, Drew and 6 more | 53 min |
Nearby
Mesoscale Discussions in Arkansas, 2011Mesoscale Discussions in Missouri, 2011Mesoscale Discussions in Oklahoma, 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.