Alert archive / Arkansas / Mesoscale Discussions in 2011

Mesoscale Discussion 552

April 24, 201115 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2011, 3:31 PM CDT for 15 counties in Arkansas. It was in force for 59 min.

The area

The outline as issued.

The facts

Issued: Apr 24, 2011, 3:31 PM CDT (20:31 UTC)
Expired: Apr 24, 2011, 4:30 PM CDT
In force: 59 min
Issued by: the Storm Prediction Center

Counties Cleburne County, AR, Craighead County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Newton County, AR, Pope County, AR, Randolph County, AR, Searcy County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR

The radar

The Little Rock radar (KLZK), 123 km from the middle of the area, began a volume at 20:34 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

Springfield, MO (KSGF), launched 12:00Z, 8.5 hours before the alert went out and 196 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: 495 m above ground
0-6 km bulk shear: 47 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 132 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

280 
ACUS11 KWNS 242032
SWOMCD
SPC MCD 242031
ARZ000-242130-

MESOSCALE DISCUSSION 0552
NWS STORM PREDICTION CENTER NORMAN OK
0331 PM CDT SUN APR 24 2011

AREAS AFFECTED...NRN AR

CONCERNING...TORNADO WATCH 192...

VALID 242031Z - 242130Z

THE SEVERE WEATHER THREAT FOR TORNADO WATCH 192 CONTINUES.

COMPLEX AND INTERESTING MORNING LINEAR MCS TO DISCRETE SUPERCELL
TRANSITION HAS YIELDED LONG-LIVED ROTATING THUNDERSTORMS ACROSS NRN
AR.  IN FACT...DESPITE COLD POOLS BECOMING MORE DOMINANT WITH
ORIGINAL SUPERCELLS...DOWNSTREAM CLOUD STREETS WERE ERUPTING INTO
CELLS THAT ARE QUICKLY SHOWING SIGNS OF MID-LEVEL ROTATION.
INSPECTION OF RUC PROXIMITY SOUNDINGS SUGGEST AT LEAST 150 M2/S2
0-1KM SHEAR AND A TORNADO THREAT WILL CONTINUE ACROSS NERN AR INTO
LATE THIS AFTERNOON.  OTHERWISE...DAMAGING WINDS AND LARGE HAIL CAN
ALSO BE EXPECTED.

..RACY.. 04/24/2011

...PLEASE SEE WWW.SPC.NOAA.GOV FOR GRAPHIC PRODUCT...

ATTN...WFO...MEG...LZK...TSA...

LAT...LON   36099351 36439060 36309046 35709049 35449169 35399356
            36099351

SPC that day

Everything else SPC issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 23, 8:09 PM CDT	Mesoscale Discussion	SPC	Baxter, Boone, Clay, Cleburne, Conway, Craighead and 25 more	2 hr
Apr 23, 8:19 PM CDT	Tornado Watch	SPC	Baxter, Clay, Craighead, Fulton, Greene, Independence and 9 more	4 hr
Apr 23, 10:40 PM CDT	Mesoscale Discussion	SPC	Baxter, Benton, Boone, Carroll, Clay, Fulton and 8 more	95 min
Apr 24, 11:58 AM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Faulkner and 19 more	62 min
Apr 24, 12:27 PM CDT	Tornado Watch	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Fulton and 16 more	7 hr
Apr 24, 5:34 PM CDT	Mesoscale Discussion	SPC	Crawford, Franklin, Madison, Polk, Scott, Sebastian and 1 more	26 min
Apr 24, 5:36 PM CDT	Tornado Watch	SPC	Conway, Crawford, Franklin, Garland, Johnson, Logan and 8 more	7 hr
Apr 24, 6:23 PM CDT	Mesoscale Discussion	SPC	Baxter, Clay, Cleburne, Conway, Craighead, Faulkner and 32 more	2 hr

Nearby

Mesoscale Discussions in Arkansas, 2011 Every mesoscale discussion 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.