Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 818, NWS Little Rock, AR
NWS Little Rock, AR issued this severe thunderstorm warning at Aug 10, 2011, 7:19 AM CDT for 4 counties in Arkansas. It was in force for 56 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 10, 2011, 7:19 AM CDT (12:19 UTC)
- Expired
- Aug 10, 2011, 8:15 AM CDT
- In force
- 56 min
- Issued by
- NWS Little Rock, AR
- Area
- Storm-based polygon
Counties Lonoke County, AR, Prairie County, AR, Pulaski County, AR, White County, AR
The radar
The Little Rock radar (KLZK), 36 km from the middle of the area, began a volume at 12:19 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 10, 3:15 AM CDT | Severe Thunderstorm Watch | SPC | 6 hr |
The nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 0.3 hours before the alert went out and 176 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
- 2536 J/kg
- Mixed-layer CIN
- -126 J/kg
- Mixed-layer LCL
- 1146 m above ground
- 0-6 km bulk shear
- 14 kt
- 0-1 km storm-relative helicity
- 38 m²/s²
- 0-3 km storm-relative helicity
- 140 m²/s²
- Significant tornado parameter
- 0.5
- Supercell composite
- 3.7
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Little Rock, AR wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 10, 6:57 AM CDT, 22 minutes earlier.
Area forecast discussion, Aug 10, 6:57 AM CDT, 22 minutes before
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</html>Hazardous weather outlook, Aug 10, 5:00 AM CDT, 2 hours 19 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE LITTLE ROCK AR 500 AM CDT WED AUG 10 2011 ARZ003>007-012>016-021>025-030>034-037>047-052>057-062>069-111000- ARKANSAS-BAXTER-BOONE-BRADLEY-CALHOUN-CLARK-CLEBURNE-CLEVELAND- CONWAY-DALLAS-DESHA-DREW-FAULKNER-FULTON-GARLAND-GRANT-HOT SPRING- INDEPENDENCE-IZARD-JACKSON-JEFFERSON-JOHNSON-LINCOLN-LOGAN-LONOKE- MARION-MONROE-MONTGOMERY-NEWTON-OUACHITA-PERRY-PIKE-POLK-POPE- PRAIRIE-PULASKI-SALINE-SCOTT-SEARCY-SHARP-STONE-VAN BUREN-WHITE- WOODRUFF-YELL- 500 AM CDT WED AUG 10 2011 THIS HAZARDOUS WEATHER OUTLOOK IS FOR A LARGE PART OF ARKANSAS. .DAY ONE...TODAY AND TONIGHT SHOWERS AND THUNDERSTORMS WILL CONTINUE AFFECTING PARTS OF NORTHWEST ARKANSAS THIS MORNING. STRONG AND SEVERE STORMS WILL BE POSSIBLE DURING THE EARLY MORNING HOURS...WITH DAMAGING WINDS THE MAIN THREAT. AS THE MORNING PROGRESSES...THE ACTIVITY IS EXPECTED TO WEAKEN. LATER TODAY...SCATTERED SHOWERS AND THUNDERSTORMS WILL REDEVELOP OVER MUCH OF THE STATE. ANY STORM THAT DOES FORM COULD BECOME STRONG TO SEVERE...WITH DAMAGING WINDS AND LARGE HAIL THE MAIN THREATS WITH THE STRONGEST STORMS. LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY NORTHWEST FLOW ALOFT WILL BRING A SERIES OF UPPER LEVEL IMPULSES ACROSS THE AREA AS WE HEAD INTO THE WEEKEND. THIS WILL RESULT IN CONTINUING CHANCES OF SHOWERS AND THUNDERSTORMS OVER MUCH OF ARKANSAS. ANY STORMS HAVE THE POTENTIAL TO BECOME SEVERE...WITH DAMAGING WINDS THE MAIN THREAT. LARGE HAIL AND LOCALLY HEAVY RAINFALL WILL ALSO BE POSSIBLE. BY SATURDAY AND SUNDAY...A COLD FRONT WILL PASS SOUTHWARD ACROSS THE STATE...WITH SHOWERS AND THUNDERSTORMS ONCE AGAIN POSSIBLE. COOLER AND DRIER CONDITIONS ARE EXPECTED BEHIND THIS FRONT...WITH BELOW NORMAL TEMPERATURES POSSIBLE HEADING INTO EARLY NEXT WEEK. .SPOTTER INFORMATION STATEMENT... SPOTTER ACTIVATION IS NOT ANTICIPATED AT THIS TIME. && VISIT NWS LITTLE ROCK ON THE WEB. GO TO HTTP://WEATHER.GOV AND CLICK ON CENTRAL ARKANSAS. 44
In the hours before
Local storm report, Aug 10, 6:02 AM CDT, 1 hour 17 minutes before
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</html>Local storm report, Aug 10, 6:03 AM CDT, 1 hour 16 minutes before
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</html>Local storm report, Aug 10, 6:26 AM CDT, 53 minutes before
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</html>Special weather statement, Aug 10, 6:49 AM CDT, 30 minutes before
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</html>Local storm report, Aug 10, 6:57 AM CDT, 22 minutes before
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</html>Local storm report, Aug 10, 7:14 AM CDT, 5 minutes before
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</html>The office that day
Everything else NWS Little Rock, AR issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 5:18 AM CDT | Severe Thunderstorm Warning | LZK | Johnson, Logan, Yell | 57 min |
| Aug 10, 5:29 AM CDT | Severe Thunderstorm Warning | LZK | Johnson | 61 min |
| Aug 10, 5:52 AM CDT | Severe Thunderstorm Warning | LZK | Conway, Johnson, Logan, Pope, Van Buren, Yell | 38 min |
| Aug 10, 6:20 AM CDT | Severe Thunderstorm Warning | LZK | Conway, Johnson, Logan, Perry, Pope, Saline and 1 more | 33 min |
| Aug 10, 6:34 AM CDT | Severe Thunderstorm Warning | LZK | Conway, Faulkner, Perry, Pope, Pulaski, Saline and 1 more | 56 min |
| Aug 10, 6:49 AM CDT | Special Weather Statement | LZK | Van Buren | 46 min |
| Aug 10, 7:00 AM CDT | Severe Thunderstorm Warning | LZK | Cleburne, Faulkner, Lonoke, Pulaski, Van Buren, White | 60 min |
| Aug 10, 7:04 AM CDT | Severe Thunderstorm Warning | LZK | Cleburne, Conway, Van Buren | 56 min |
| Aug 10, 7:42 AM CDT | Special Weather Statement | LZK | Jefferson | 43 min |
| Aug 10, 7:55 AM CDT | Special Weather Statement | LZK | Lonoke, Monroe, Prairie, Woodruff | 55 min |
| Aug 10, 8:00 AM CDT | Severe Thunderstorm Warning | LZK | Cleburne, Independence, Jackson, White, Woodruff | 60 min |
| Aug 10, 8:41 AM CDT | Special Weather Statement | LZK | Woodruff | 29 min |
| Aug 10, 8:58 AM CDT | Special Weather Statement | LZK | Jackson | 27 min |
Nearby
Severe Thunderstorm Warnings in Arkansas, 2011Every severe thunderstorm warning 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.