Alert archive / Arkansas / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 329, NWS Memphis, TN

April 30, 20114 counties in Arkansas

NWS Memphis, TN issued this severe thunderstorm warning at Apr 30, 2011, 6:49 PM 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: Apr 30, 2011, 6:49 PM CDT (23:49 UTC)
Expired: Apr 30, 2011, 7:45 PM CDT
In force: 56 min
Issued by: NWS Memphis, TN
Area: Storm-based polygon

Counties Clay County, AR, Greene County, AR, Lawrence County, AR, Randolph County, AR

The radar

The Memphis radar (KNQA), 127 km from the middle of the area, began a volume at 23:53 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

Little Rock, AR (KLZK), launched 12:00Z, 11.8 hours before the alert went out and 171 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1478 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: 306 m²/s²
0-3 km storm-relative helicity: 537 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

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 Memphis, TN wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 30, 4:27 PM CDT, 2 hours 22 minutes earlier.

Area forecast discussion, Apr 30, 4:27 PM CDT, 2 hours 22 minutes before

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Hazardous weather outlook, Apr 30, 4:34 PM CDT, 2 hours 15 minutes before

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In the hours before

Local storm report, Apr 30, 1:33 PM CDT, 5 hours 16 minutes before

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Local storm report, Apr 30, 5:18 PM CDT, 1 hour 31 minutes before

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Local storm report, Apr 30, 5:19 PM CDT, 1 hour 30 minutes before

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Local storm report, Apr 30, 5:22 PM CDT, 1 hour 27 minutes before

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Special weather statement, Apr 30, 6:12 PM CDT, 37 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
612 PM CDT SAT APR 30 2011

MOZ115-TNZ001>003-019-302345-
PEMISCOT MO-WEAKLEY TN-LAKE TN-OBION TN-DYER TN-
612 PM CDT SAT APR 30 2011

...THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY UNTIL 645 PM CDT FOR...

  NORTH CENTRAL DYER COUNTY IN NORTHWEST TENNESSEE...
  LAKE COUNTY IN NORTHWEST TENNESSEE...
  OBION COUNTY IN NORTHWEST TENNESSEE...
  NORTHWESTERN WEAKLEY COUNTY IN NORTHWEST TENNESSEE...
  EAST CENTRAL PEMISCOT COUNTY IN SOUTHEAST MISSOURI...

A STRONG THUNDERSTORM PRODUCING PEA TO PENNY HAIL WAS LOCATED 5
MILES NORTHWEST OF CLOVERDALE AT 612 PM CDT...MOVING NORTHEAST AT 55
MPH.

BRIEF VERY HEAVY RAIN AND WINDS TO 35 MPH WILL OCCUR WITH THIS
THUNDERSTORM.

PEOPLE IN DYER...LAKE...OBION...PEMISCOT AND WEAKLEY COUNTIES...
INCLUDING LOCATIONS NEAR REELFOOT LAKE STATE PARK AND UNION CITY...
SHOULD MONITOR THIS STORM CLOSELY. THIS SIGNIFICANT WEATHER ALERT
ALSO INCLUDES REELFOOT LAKE.

&&

LAT...LON 3648 8869 3612 8950 3614 8963 3637 8956
      3636 8954 3639 8953 3651 8923 3650 8907
      3651 8871
TIME...MOT...LOC 2312Z 240DEG 49KT 3633 8931

Special weather statement, Apr 30, 6:46 PM CDT, 3 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MEMPHIS TN
646 PM CDT SAT APR 30 2011

ARZ008-009-017-018-010030-
CLAY AR-RANDOLPH AR-GREENE AR-LAWRENCE AR-
646 PM CDT SAT APR 30 2011

...THE NATIONAL WEATHER SERVICE IN MEMPHIS HAS ISSUED A SIGNIFICANT
WEATHER ADVISORY UNTIL 730 PM CDT FOR...

  WESTERN CLAY COUNTY IN EASTERN ARKANSAS...
  NORTHWESTERN GREENE COUNTY IN EASTERN ARKANSAS...
  LAWRENCE COUNTY IN EASTERN ARKANSAS...
  RANDOLPH COUNTY IN EASTERN ARKANSAS...

A STRONG THUNDERSTORM PRODUCING PENNY SIZE HAIL AND WINDS TO 45 MPH
WAS LOCATED 4 MILES NORTHWEST OF STRAWBERRY AT 646 PM CDT...MOVING
NORTHEAST AT 55 MPH.

VERY HEAVY RAIN WILL OCCUR WITH THIS THUNDERSTORM.

PEOPLE IN CLAY...GREENE...LAWRENCE AND RANDOLPH COUNTIES...INCLUDING
LOCATIONS NEAR BLACK ROCK...CORNING...HOXIE...LAKE CHARLES STATE
PARK...POCAHONTAS AND WALNUT RIDGE...SHOULD MONITOR THIS STORM
CLOSELY.

&&

LAT...LON 3594 9136 3623 9136 3625 9133 3625 9127
      3629 9127 3650 9096 3650 9072 3643 9056
      3619 9057 3589 9115 3589 9135 3592 9137
TIME...MOT...LOC 2346Z 238DEG 46KT 3601 9135

The office that day

Everything else NWS Memphis, TN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 30, 11:15 AM CDT	Areal Flood Warning	MEG	Alcorn, Benton, Calhoun, DeSoto, Lafayette, Marshall and 5 more	24 hr
Apr 30, 11:16 AM CDT	Areal Flood Warning	MEG	Tishomingo	24 hr
Apr 30, 10:00 AM CDT	River Flood Warning	MEG	Obion, Weakley	5 days
Apr 30, 10:06 AM CDT	River Flood Warning	MEG	Lauderdale, Tipton	6 days
Apr 30, 6:12 PM CDT	Special Weather Statement	MEG	Lake, Obion	33 min
Apr 30, 6:46 PM CDT	Special Weather Statement	MEG	Lawrence, Randolph	44 min

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.