Alert archive / Arkansas / Severe Thunderstorm Watches in 2005
Severe Thunderstorm Watch 21
The Storm Prediction Center issued this severe thunderstorm watch at Feb 21, 2005, 2:30 AM CST for 17 counties in Arkansas. It was in force for 4 hr.
The area
The outline as issued.
The facts
- Issued
- Feb 21, 2005, 2:30 AM CST (08:30 UTC)
- Expired
- Feb 21, 2005, 6:00 AM CST
- In force
- 4 hr
- Issued by
- the Storm Prediction Center
Counties Baxter County, AR, Boone County, AR, Cleburne County, AR, Conway County, AR, Fulton County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Lawrence County, AR, Marion County, AR, Pope County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, White County, AR
The radar
The Little Rock radar (KLZK), 131 km from the middle of the area, began a volume at 08:30 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.
Warnings issued inside it
8 tornado, severe thunderstorm and flash flood warnings for its counties while it was in force.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 21, 2:56 AM CST | Severe Thunderstorm Warning | LZK | Pope, Searcy | 64 min |
| Feb 21, 3:11 AM CST | Severe Thunderstorm Warning | LZK | Baxter, Marion | 49 min |
| Feb 21, 3:30 AM CST | Severe Thunderstorm Warning | LZK | Conway, Stone, Van Buren | 60 min |
| Feb 21, 3:36 AM CST | Severe Thunderstorm Warning | LZK | Fulton, Izard | 39 min |
| Feb 21, 3:59 AM CST | Severe Thunderstorm Warning | LZK | Cleburne, Faulkner, Independence, Sharp | 61 min |
| Feb 21, 4:27 AM CST | Severe Thunderstorm Warning | MEG | Lawrence, Randolph | 48 min |
| Feb 21, 4:30 AM CST | Severe Thunderstorm Warning | LZK | White | 60 min |
| Feb 21, 5:16 AM CST | Severe Thunderstorm Warning | LZK | Jackson, Monroe, Prairie, Woodruff | 59 min |
Discussions around it
SPC mesoscale discussions over the same counties from four hours before the watch to its end.
The nearest sounding before it
Springfield, MO (KSGF), launched 00:00Z, 8.5 hours before the alert went out and 169 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
- 424 J/kg
- Mixed-layer CIN
- -21 J/kg
- Mixed-layer LCL
- 1413 m above ground
- 0-6 km bulk shear
- 49 kt
- 0-1 km storm-relative helicity
- 69 m²/s²
- 0-3 km storm-relative helicity
- 134 m²/s²
- Significant tornado parameter
- 0.1
- Supercell composite
- 1.3
The text
As transmitted, in the capitals the NWS used until 2016.
000
WWUS20 KWNS 210827
SEL1
SPC WW 210827
ARZ000-211200-
URGENT - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WATCH NUMBER 21
NWS STORM PREDICTION CENTER NORMAN OK
230 AM CST MON FEB 21 2005
THE NWS STORM PREDICTION CENTER HAS ISSUED A
SEVERE THUNDERSTORM WATCH FOR PORTIONS OF
NORTHERN ARKANSAS
EFFECTIVE THIS MONDAY MORNING FROM 230 AM UNTIL 600 AM CST.
HAIL TO 1.5 INCHES IN DIAMETER...THUNDERSTORM WIND GUSTS TO 80
MPH...AND DANGEROUS LIGHTNING ARE POSSIBLE IN THESE AREAS.
THE SEVERE THUNDERSTORM WATCH AREA IS APPROXIMATELY ALONG AND 45
STATUTE MILES NORTH AND SOUTH OF A LINE FROM 25 MILES SOUTH OF
HARRISON ARKANSAS TO 20 MILES SOUTH OF WALNUT RIDGE ARKANSAS. FOR
A COMPLETE DEPICTION OF THE WATCH SEE THE ASSOCIATED WATCH OUTLINE
UPDATE (WOUS64 KWNS WOU1).
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE
FAVORABLE FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA.
PERSONS IN THESE AREAS SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS AND POSSIBLE
WARNINGS. SEVERE THUNDERSTORMS CAN AND OCCASIONALLY DO PRODUCE
TORNADOES.
OTHER WATCH INFORMATION...THIS SEVERE THUNDERSTORM WATCH REPLACES
SEVERE THUNDERSTORM WATCH NUMBER 19. WATCH NUMBER 19 WILL NOT BE
IN EFFECT AFTER 230 AM CST. CONTINUE...WW 20...
DISCUSSION...SEVERE BOW ECHO EXPECTED TO MOVE EWD 50-60 KT ACROSS
NRN AR OZARKS WITH CONTINUED THREAT OF DAMAGING WIND...IN FAVORABLY
UNSTABLE AIR MASS.
AVIATION...A FEW SEVERE THUNDERSTORMS WITH HAIL SURFACE AND ALOFT
TO 1.5 INCHES. EXTREME TURBULENCE AND SURFACE WIND GUSTS TO 70
KNOTS. A FEW CUMULONIMBI WITH MAXIMUM TOPS TO 450. MEAN STORM
MOTION VECTOR 24050.
...Edwards/Hart
363,0930 362,0905 351,0905 351,0930SPC that day
Everything else SPC issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Feb 20, 8:51 PM CST | Mesoscale Discussion | SPC | Baxter, Boone, Carroll, Cleburne, Conway, Crawford and 27 more | 114 min |
| Feb 20, 9:10 PM CST | Severe Thunderstorm Watch | SPC | Baxter, Benton, Boone, Carroll, Cleburne, Conway and 29 more | 6 hr |
| Feb 20, 11:22 PM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 42 more | 113 min |
| Feb 21, 12:30 AM CST | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Jackson and 8 more | 6 hr |
| Feb 21, 2:10 AM CST | Mesoscale Discussion | SPC | Baxter, Benton, Boone, Carroll, Clay, Cleburne and 43 more | 95 min |
| Feb 21, 4:29 AM CST | Mesoscale Discussion | SPC | Baxter, Boone, Clay, Cleburne, Conway, Craighead and 16 more | 2 hr |
| Feb 21, 5:45 AM CST | Severe Thunderstorm Watch | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 3 hr |
| Feb 21, 7:50 AM CST | Mesoscale Discussion | SPC | Clay, Craighead, Crittenden, Cross, Greene, Lee and 4 more | 55 min |
| Feb 21, 3:58 PM CST | Mesoscale Discussion | SPC | Arkansas, Desha, Drew, Jefferson, Lincoln, Phillips | 92 min |
Nearby
Severe Thunderstorm Watches in Arkansas, 2005Every severe thunderstorm watch in 2005
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.