Alert archive / Arkansas / Severe Thunderstorm Warnings in 2012

Severe Thunderstorm Warning 383, NWS Little Rock, AR

August 17, 2012Clark County, Arkansas

NWS Little Rock, AR issued this severe thunderstorm warning at Aug 17, 2012, 6:05 PM CDT for Clark County, Arkansas. It was in force for 25 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 17, 2012, 6:05 PM CDT (23:05 UTC)
Expired: Aug 17, 2012, 6:30 PM CDT
In force: 25 min
Issued by: NWS Little Rock, AR
Area: Storm-based polygon

County Clark County, AR

The radar

The Little Rock radar (KLZK), 121 km from the middle of the area, began a volume at 23:05 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 nearest sounding before it

Shreveport, LA (KBAD), launched 12:00Z, 11.1 hours before the alert went out and 183 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: 112 J/kg
Mixed-layer CIN: -145 J/kg
Mixed-layer LCL: 1226 m above ground
0-6 km bulk shear: 18 kt
0-1 km storm-relative helicity: -87 m²/s²
0-3 km storm-relative helicity: -41 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 17, 2:54 PM CDT, 3 hours 11 minutes earlier.

Area forecast discussion, Aug 17, 2:54 PM CDT, 3 hours 11 minutes before

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Hazardous weather outlook, Aug 17, 8:55 AM CDT, 9 hours 10 minutes before

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In the hours before

Special weather statement, Aug 17, 4:46 PM CDT, 1 hour 19 minutes before

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Special weather statement, Aug 17, 5:22 PM CDT, 43 minutes before

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Special weather statement, Aug 17, 5:25 PM CDT, 40 minutes before

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Special weather statement, Aug 17, 5:55 PM CDT, 10 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE LITTLE ROCK AR
555 PM CDT FRI AUG 17 2012

ARZ053-172325-
CLARK AR-
555 PM CDT FRI AUG 17 2012

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CLARK COUNTY UNTIL 630 PM
CDT...

AT 552 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR WAS TRACKING A
STRONG THUNDERSTORM 2 MILES EAST OF OKOLONA...OR 14 MILES NORTH OF
PRESCOTT...MOVING SOUTHEAST AT 5 MPH.

HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM.

* LOCATIONS IMPACTED INCLUDE...
  OKOLONA...            HALFWAY...            GURDON...
  BEIRNE...             BURTSELL...           SMYRNA...
  SMITHTON...           PIKE JUNCTION...      MEEKS SETTLEMENT...
  LOVE CREEK...         HARETOWN...           DOBYVILLE...
  BOSWELL LAKE...       BETHEL...

THIS INCLUDES INTERSTATE 30 BETWEEN MILE MARKERS 54 AND 65.

IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.

LAT...LON 3385 9331 3390 9331 3395 9338 3398 9338
      3401 9341 3403 9341 3412 9331 3396 9307
      3382 9324 3382 9326
TIME...MOT...LOC 2255Z 313DEG 5KT 3399 9330

58

The office that day

Everything else NWS Little Rock, AR issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 16, 7:03 PM CDT	Special Weather Statement	LZK	Johnson	32 min
Aug 16, 7:18 PM CDT	Flash Flood Warning	LZK	Johnson, Newton, Pope	3 hr
Aug 16, 7:55 PM CDT	Special Weather Statement	LZK	Perry	45 min
Aug 16, 8:53 PM CDT	Flash Flood Warning	LZK	Boone, Marion, Newton, Searcy	3 hr
Aug 16, 11:10 PM CDT	Special Weather Statement	LZK	Conway	30 min
Aug 17, 4:46 PM CDT	Special Weather Statement	LZK	Polk	29 min
Aug 17, 5:22 PM CDT	Special Weather Statement	LZK	Clark	43 min
Aug 17, 5:25 PM CDT	Special Weather Statement	LZK	Polk	30 min
Aug 17, 5:55 PM CDT	Special Weather Statement	LZK	Clark	30 min
Aug 17, 6:15 PM CDT	Special Weather Statement	LZK	Clark	30 min
Aug 17, 6:29 PM CDT	Severe Thunderstorm Warning	LZK	Clark	31 min
Aug 17, 6:52 PM CDT	Special Weather Statement	LZK	Dallas	28 min

Nearby

Severe Thunderstorm Warnings in Arkansas, 2012 Every severe thunderstorm warning in 2012

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.