Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 552

April 24, 2009Polk County, Sebastian County, Arkansas; 7 counties in Oklahoma; Red River County, Texas

The Storm Prediction Center issued this mesoscale discussion at Apr 24, 2009, 3:58 PM CDT for Polk County, Sebastian County, Arkansas; 7 counties in Oklahoma; Red River County, Texas. It was in force for 92 min.

The area

The outline as issued.

The facts

Issued
Apr 24, 2009, 3:58 PM CDT (20:58 UTC)
Expired
Apr 24, 2009, 5:30 PM CDT
In force
92 min
Issued by
the Storm Prediction Center

Counties Polk County, AR, Sebastian County, AR, Haskell County, OK, Latimer County, OK, LeFlore County, OK, McCurtain County, OK, Pittsburg County, OK, Pushmataha County, OK, Sequoyah County, OK, Red River County, TX

The radar

The Western Arkansas radar (KSRX), 86 km from the middle of the area, began a volume at 20:59 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

Norman, OK (KOUN), launched 12:00Z, 9.0 hours before the alert went out and 234 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-pSkew-T log-p diagram, Norman, OK at 12:00Z on 2009-04-24Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 996 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Norman, OK at 12:00Z on 2009-04-24The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 300 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
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
996 J/kg
Mixed-layer CIN
-298 J/kg
Mixed-layer LCL
732 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
300 m²/s²
0-3 km storm-relative helicity
278 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.

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SPC that day

Everything else SPC issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 24, 12:07 PM CDTMesoscale DiscussionSPCAnderson, Atascosa, Austin, Bastrop, Bell, Bexar and 63 more113 min

Nearby

Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Texas, 2009Every mesoscale discussion in 2009

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.