Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 67, NWS Little Rock, AR

April 11, 2011Boone County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Apr 11, 2011, 12:13 AM CDT for Boone County, Arkansas. It was in force for 17 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, 12:13 AM CDT (05:13 UTC)
Expired: Apr 11, 2011, 12:30 AM CDT
In force: 17 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

County Boone County, AR

The radar

The Springfield radar (KSGF), 107 km from the middle of the area, began a volume at 05:13 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 10, 7:28 PM CDT	Tornado Watch	SPC	8 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 00:00Z, 5.2 hours before the alert went out and 91 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 601 J/kg
Mixed-layer CIN: -95 J/kg
Mixed-layer LCL: 1468 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 234 m²/s²
0-3 km storm-relative helicity: 188 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 3.1

Open this sounding in Storm Lab

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 10, 9:10 PM CDT, 3 hours 3 minutes earlier.

Area forecast discussion, Apr 10, 9:10 PM CDT, 3 hours 3 minutes before

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Hazardous weather outlook, Apr 10, 8:26 PM CDT, 3 hours 47 minutes before

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In the hours before

Special weather statement, Apr 10, 11:57 PM CDT, 16 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
1157 PM CDT SUN APR 10 2011

ARZ003-110510-
BOONE AR-
1157 PM CDT SUN APR 10 2011

...SIGNIFICANT WEATHER ADVISORY FOR NORTHWESTERN BOONE COUNTY UNTIL
1215 AM CDT...

AT 1157 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING
A STRONG THUNDERSTORM 4 MILES SOUTHWEST OF RED BLUFF...OR 7 MILES
NORTHEAST OF GREEN FOREST...MOVING NORTHEAST AT 60 MPH.

HAIL UP TO THE SIZE OF PENNIES AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  ROBERSON HOLLOW...    OMAHA...              BURLINGTON...
  RED BLUFF...          CRICKET...            CREST...

THIS STORM MAY INTENSIFY....AND A TORNADO WATCH IS IN EFFECT FOR THIS
AREA. BE CERTAIN TO MONITOR LOCAL RADIO AND TV STATIONS...AS WELL AS
LOCAL CABLE TV OUTLETS....FOR ADDITIONAL INFORMATION AND POSSIBLE
WARNINGS FROM THE NATIONAL WEATHER SERVICE.

LAT...LON 3649 9302 3634 9330 3635 9331 3649 9331
      3650 9330 3650 9302
TIME...MOT...LOC 0457Z 234DEG 53KT 3643 9334

58

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, 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, 11:32 AM CDT	Severe Thunderstorm Warning	LZK	Arkansas, Monroe, Prairie, Woodruff	31 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, 2011 Every 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.