Alert archive / Arkansas / Mesoscale Discussions in 2003
Mesoscale Discussion 847
The Storm Prediction Center issued this mesoscale discussion at May 8, 2003, 10:21 AM CDT for 14 counties in Arkansas. It was in force for 84 min.
The area
The outline as issued.
The facts
- Issued
- May 8, 2003, 10:21 AM CDT (15:21 UTC)
- Expired
- May 8, 2003, 11:45 AM CDT
- In force
- 84 min
- Issued by
- the Storm Prediction Center
Counties Clay County, AR, Cleburne County, AR, Craighead County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR
The radar
The Little Rock radar (KLZK), 131 km from the middle of the area, began a volume at 15:25 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
Little Rock, AR (KLZK), launched 12:00Z, 3.4 hours before the alert went out and 200 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
- 2233 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 552 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 85 m²/s²
- 0-3 km storm-relative helicity
- 195 m²/s²
- Significant tornado parameter
- 1.9
- Supercell composite
- 10.4
The text
As transmitted, in the capitals the NWS used until 2016.
055 ACUS11 KWNS 081522 SWOMCD SPC MCD 081521 ARZ000-MOZ000-081645- MESOSCALE DISCUSSION 0847 NWS STORM PREDICTION CENTER NORMAN OK 1021 AM CDT THU MAY 08 2003 AREAS AFFECTED...NRN/NERN AR CONCERNING...TORNADO WATCH 299... VALID 081521Z - 081645Z PERSISTENT SUPERCELL OVER VAN BUREN COUNTY CONTINUES ITS EWD MOVEMENT ALONG WARM FRONT GRADIENT ACROSS CENTRAL PORTIONS OF WW...WHILE OTHER ACTIVITY IS DEVELOPING AHEAD OF THIS STORM DOWNSTREAM APPROACHING THE BOOTHEEL OF MO. PARAMETERS CONTINUE TO FAVOR SUPERCELL STRUCTURE AND TORNADOES WITH A GRADUAL SHIFT EWD IN MAIN BODY OF CONVECTION ALONG EXISTING WARM FRONT. ..DARROW.. 05/08/2003 ...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT... ATTN...WFO...PAH...MEG...LZK... 36209263 36549043 35658998 35439180 35509278
SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 8, 1:18 AM CDT | Mesoscale Discussion | SPC | Benton, Garland, Grant, Hot Spring, Lincoln, Montgomery and 2 more | 3 hr |
| May 8, 1:55 AM CDT | Severe Thunderstorm Watch | SPC | Benton, Carroll | 5 hr |
| May 8, 5:02 AM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Howard, Johnson, Logan, Madison and 8 more | 2 hr |
| May 8, 6:20 AM CDT | Tornado Watch | SPC | Crawford, Franklin, Logan, Montgomery, Scott, Sebastian and 1 more | 3 hr |
| May 8, 7:33 AM CDT | Mesoscale Discussion | SPC | Crawford, Franklin, Johnson, Logan, Montgomery, Scott and 2 more | 87 min |
| May 8, 8:25 AM CDT | Tornado Watch | SPC | Baxter, Boone, Cleburne, Conway, Craighead, Crittenden and 18 more | 5 hr |
| May 8, 9:55 AM CDT | Mesoscale Discussion | SPC | Mississippi | 3 hr |
| May 8, 10:25 AM CDT | Tornado Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Mississippi and 3 more | 6 hr |
| May 8, 11:59 AM CDT | Mesoscale Discussion | SPC | Clay, Cleburne, Craighead, Greene, Independence, Izard and 8 more | 2 hr |
| May 8, 12:24 PM CDT | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Mississippi and 2 more | 2 hr |
| May 8, 5:31 PM CDT | Mesoscale Discussion | SPC | Benton, Carroll, Crawford, Franklin, Johnson, Logan and 4 more | 59 min |
| May 8, 5:45 PM CDT | Tornado Watch | SPC | Benton, Crawford, Sebastian, Washington | 5 hr |
| May 8, 6:38 PM CDT | Mesoscale Discussion | SPC | Benton, Crawford, Washington | 2 hr |
Nearby
Mesoscale Discussions in Arkansas, 2003Every mesoscale discussion in 2003
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.