Alert archive / Arkansas / Mesoscale Discussions in 2010
Mesoscale Discussion 430
The Storm Prediction Center issued this mesoscale discussion at Apr 30, 2010, 7:26 PM CDT for 21 counties in Arkansas; Howell County, Oregon County, Shannon County, Missouri. It was in force for 2 hr.
The area
The outline as issued.
The facts
- Issued
- Apr 30, 2010, 7:26 PM CDT (00:26 UTC)
- Expired
- Apr 30, 2010, 9:30 PM CDT
- In force
- 2 hr
- Issued by
- the Storm Prediction Center
All 24 counties
Baxter County, AR, Cleburne County, AR, Conway County, AR, Faulkner County, AR, Fulton County, AR, Garland County, AR, Hot Spring County, AR, Howard County, AR, Independence County, AR, Izard County, AR, Little River County, AR, Montgomery County, AR, Perry County, AR, Pike County, AR, Pulaski County, AR, Saline County, AR, Sevier County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Yell County, AR, Howell County, MO, Oregon County, MO, Shannon County, MO
The radar
The Little Rock radar (KLZK), 71 km from the middle of the area, began a volume at 00:30 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 watches that followed
Watches SPC issued over any of the same counties within four hours of this discussion.
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 0.4 hours before the alert went out and 197 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
- 1925 m above ground
- 0-6 km bulk shear
- 81 kt
- 0-1 km storm-relative helicity
- -209 m²/s²
- 0-3 km storm-relative helicity
- 122 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.5
The text
As transmitted, in the capitals the NWS used until 2016.
550
ACUS11 KWNS 010026
SWOMCD
SPC MCD 010026
MOZ000-ARZ000-OKZ000-010230-
MESOSCALE DISCUSSION 0430
NWS STORM PREDICTION CENTER NORMAN OK
0726 PM CDT FRI APR 30 2010
AREAS AFFECTED...SW INTO CENTRAL AND N CENTRAL AR...S CENTRAL MO
CONCERNING...TORNADO WATCH 116...
VALID 010026Z - 010230Z
THE SEVERE WEATHER THREAT FOR TORNADO WATCH 116 CONTINUES.
DANGEROUS TORNADO SITUATION UNFOLDING ACROSS AR/SRN MO THIS
EVENING...AND THE TORNADO THREAT WILL CONTINUE INTO THE OVERNIGHT
HOURS.
MULTIPLE DISCRETE SUPERCELLS CONTINUE TO INTENSIFY IN A BROKEN BAND
FROM N OF TXK TO NW OF LIT INTO S CENTRAL MO. THESE STORMS ARE
MOVING INTO AN ENVIRONMENT WITH STRONG LOW-LEVEL AND DEEP-LAYER
SHEAR...AS WELL AS RICH LOW-LEVEL MOISTURE AND MODERATE INSTABILITY
/PER THE 00Z LZK SOUNDING/. GIVEN THE OBSERVED STORM STRUCTURES AND
ENVIRONMENT...A FEW STRONG/LONG-TRACK TORNADOES NOW APPEAR LIKELY.
THE CONVECTIVE MODE AND STORM ENVIRONMENT ARE NOT EXPECTED TO CHANGE
SUBSTANTIALLY INTO THE EARLY OVERNIGHT HOURS...THUS THE SIGNIFICANT
TORNADO THREAT WILL PERSIST WELL AFTER DARK.
..THOMPSON.. 05/01/2010
...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...
ATTN...WFO...PAH...MEG...LZK...SGF...SHV...
LAT...LON 34899212 34239292 33689423 33929459 34559397 35549279
36259256 36989196 37369150 36969094 35709152 34899212SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 30, 9:09 PM CDT | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 49 more | 7 hr |
| Apr 30, 10:43 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 49 more | 62 min |
| Apr 30, 11:41 PM CDT | Mesoscale Discussion | SPC | Arkansas, Bradley, Calhoun, Clark, Clay, Cleburne and 45 more | 64 min |
| May 1, 2:25 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 40 more | 95 min |
| May 1, 3:11 AM CDT | Tornado Watch | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 24 more | 8 hr |
| May 1, 6:17 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 9 more | 88 min |
| May 1, 7:48 AM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Cleveland and 22 more | 57 min |
| May 1, 9:52 AM CDT | Tornado Watch | SPC | Ashley, Chicot | 8 hr |
| May 1, 11:19 AM CDT | Mesoscale Discussion | SPC | Crittenden | 56 min |
| May 1, 1:37 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 38 more | 53 min |
| May 1, 3:11 PM CDT | Mesoscale Discussion | SPC | Benton | 94 min |
| May 1, 3:18 PM CDT | Tornado Watch | SPC | Arkansas, Bradley, Calhoun, Clark, Cleburne, Cleveland and 43 more | 7 hr |
| May 1, 5:43 PM CDT | Mesoscale Discussion | SPC | Arkansas, Ashley, Bradley, Calhoun, Clark, Cleveland and 31 more | 62 min |
| Apr 30, 7:12 PM CDT | Mesoscale Discussion | SPC | Crawford, Dent, Franklin, Gasconade, Iron, Jefferson and 13 more | 63 min |
| Apr 30, 8:36 PM CDT | Mesoscale Discussion | SPC | Bollinger, Cape Girardeau, Iron, Jefferson, Madison, Mississippi and 12 more | 54 min |
| Apr 30, 9:03 PM CDT | Tornado Watch | SPC | Bollinger, Butler, Cape Girardeau, Carter, Iron, Jefferson and 17 more | 6 hr |
Nearby
Mesoscale Discussions in Arkansas, 2010Mesoscale Discussions in Missouri, 2010Every mesoscale discussion in 2010
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.