Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011
Severe Thunderstorm Warning 71, NWS Little Rock, AR
NWS Little Rock, AR issued this severe thunderstorm warning at Apr 11, 2011, 11:32 AM CDT for 4 counties in Arkansas. It was in force for 31 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
- Apr 11, 2011, 11:32 AM CDT (16:32 UTC)
- Expired
- Apr 11, 2011, 12:03 PM CDT
- In force
- 31 min
- Issued by
- NWS Little Rock, AR
- Area
- Storm-based polygon
Counties Arkansas County, AR, Monroe County, AR, Prairie County, AR, Woodruff County, AR
The radar
The Little Rock radar (KLZK), 84 km from the middle of the area, began a volume at 16:33 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 |
|---|---|---|---|
| Apr 11, 10:31 AM CDT | Tornado Watch | SPC | 6 hr |
The nearest sounding before it
Little Rock, AR (KLZK), launched 12:00Z, 4.5 hours before the alert went out and 128 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
- 936 J/kg
- Mixed-layer CIN
- -7 J/kg
- Mixed-layer LCL
- 647 m above ground
- 0-6 km bulk shear
- 66 kt
- 0-1 km storm-relative helicity
- 296 m²/s²
- 0-3 km storm-relative helicity
- 322 m²/s²
- Significant tornado parameter
- 2.0
- Supercell composite
- 6.5
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 Apr 11, 11:08 AM CDT, 24 minutes earlier.
Area forecast discussion, Apr 11, 11:08 AM CDT, 24 minutes before
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Special weather statement, Apr 11, 8:50 AM CDT, 2 hours 42 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 |
|---|---|---|---|---|
| Apr 10, 11:57 PM CDT | Special Weather Statement | LZK | Boone | 13 min |
| Apr 11, 12:13 AM CDT | Severe Thunderstorm Warning | LZK | Boone | 17 min |
| Apr 11, 1:42 AM CDT | Severe Thunderstorm Warning | LZK | Boone, Johnson, Marion, Newton | 35 min |
| Apr 11, 4:11 AM CDT | Special Weather Statement | LZK | Montgomery, Polk | 44 min |
| Apr 11, 4:42 AM CDT | Special Weather Statement | LZK | Montgomery, Pike | 28 min |
| Apr 11, 5:06 AM CDT | Special Weather Statement | LZK | Clark, Garland, Hot Spring, Montgomery, Perry, Pike | 44 min |
| Apr 11, 5:29 AM CDT | Special Weather Statement | LZK | Garland, Perry | 31 min |
| Apr 11, 5:39 AM CDT | Special Weather Statement | LZK | Cleburne, Independence | 46 min |
| Apr 11, 5:59 AM CDT | Special Weather Statement | LZK | Conway, Faulkner, Lonoke, Pulaski, Saline, White | 46 min |
| Apr 11, 6:30 AM CDT | Special Weather Statement | LZK | Independence, Jackson | 45 min |
| Apr 11, 6:33 AM CDT | Special Weather Statement | LZK | Lonoke, Prairie, Pulaski, Woodruff | 42 min |
| Apr 11, 7:14 AM CDT | Special Weather Statement | LZK | Woodruff | 31 min |
| Apr 11, 7:26 AM CDT | Special Weather Statement | LZK | Dallas, Ouachita | 29 min |
| Apr 11, 8:03 AM CDT | Special Weather Statement | LZK | Cleveland, Jefferson | 47 min |
| Apr 11, 8:50 AM CDT | Special Weather Statement | LZK | Arkansas, Monroe | 30 min |
| Apr 11, 9:40 AM CDT | Special Weather Statement | LZK | Dallas, Grant | 30 min |
| Apr 11, 10:11 AM CDT | Special Weather Statement | LZK | Lonoke | 29 min |
| Apr 11, 10:13 AM CDT | Special Weather Statement | LZK | Dallas | 32 min |
| Apr 11, 10:22 AM CDT | Severe Thunderstorm Warning | LZK | Jefferson, Lonoke, Prairie, Pulaski, Saline | 23 min |
| Apr 11, 10:35 AM CDT | Severe Thunderstorm Warning | LZK | Grant, Jefferson, Lonoke, Pulaski | 25 min |
| Apr 11, 11:17 AM CDT | Special Weather Statement | LZK | Monroe, Prairie | 48 min |
| Apr 11, 3:43 PM CDT | Lake Wind Advisory | LZK | Arkansas, Baxter, Bradley, Calhoun, Clark, Cleburne and 28 more | 4 hr |
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.