Alert archive / Oklahoma / Mesoscale Discussions in 2009

Mesoscale Discussion 601

April 27, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Apr 27, 2009, 12:32 PM CDT for 4 states. It was in force for 88 min.

The area

The outline as issued.

The facts

Issued
Apr 27, 2009, 12:32 PM CDT (17:32 UTC)
Expired
Apr 27, 2009, 2:00 PM CDT
In force
88 min
Issued by
the Storm Prediction Center
All 42 counties

Benton County, AR, Bourbon County, KS, Chautauqua County, KS, Cherokee County, KS, Crawford County, KS, Labette County, KS, Montgomery County, KS, Neosho County, KS, Wilson County, KS, Barry County, MO, Barton County, MO, Bates County, MO, Benton County, MO, Cedar County, MO, Dade County, MO, Dallas County, MO, Greene County, MO, Hickory County, MO, Jasper County, MO, Lawrence County, MO, McDonald County, MO, Newton County, MO, Polk County, MO, St. Clair County, MO, Vernon County, MO, Cherokee County, OK, Craig County, OK, Creek County, OK, Delaware County, OK, Lincoln County, OK, Mayes County, OK, Noble County, OK, Nowata County, OK, Okmulgee County, OK, Osage County, OK, Ottawa County, OK, Pawnee County, OK, Payne County, OK, Rogers County, OK, Tulsa County, OK, Wagoner County, OK, Washington County, OK

The radar

The Tulsa radar (KINX), 52 km from the middle of the area, began a volume at 17:36 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 watches that followed

Watches SPC issued over any of the same counties within four hours of this discussion.

The nearest sounding before it

Lamont, OK (KLMN), launched 12:00Z, 5.5 hours before the alert went out and 165 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, Lamont, OK at 12:00Z on 2009-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1225 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, Lamont, OK at 12:00Z on 2009-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 303 square meters per square second.1939587897Sfc1 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
1225 J/kg
Mixed-layer CIN
-29 J/kg
Mixed-layer LCL
567 m above ground
0-6 km bulk shear
47 kt
0-1 km storm-relative helicity
303 m²/s²
0-3 km storm-relative helicity
269 m²/s²
Significant tornado parameter
2.1
Supercell composite
11.6

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 27, 9:28 AM CDTSevere Thunderstorm WatchSPCColumbia, Hempstead, Howard, Lafayette, Little River, Miller and 2 more12 hr
Apr 27, 12:47 PM CDTSevere Thunderstorm WatchSPCBenton, Carroll, Washington6 hr
Apr 27, 1:14 PM CDTMesoscale DiscussionSPCHempstead, Lafayette, Little River, Miller91 min
Apr 27, 2:24 PM CDTMesoscale DiscussionSPCBradley, Calhoun, Clark, Cleveland, Columbia, Dallas and 19 more66 min
Apr 27, 2:57 PM CDTSevere Thunderstorm WatchSPCArkansas, Bradley, Calhoun, Clark, Cleveland, Columbia and 22 more6 hr
Apr 27, 3:28 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Madison, Washington2 hr
Apr 27, 5:08 PM CDTMesoscale DiscussionSPCClay, Craighead, Cross, Greene, Independence, Jackson and 5 more97 min
Apr 27, 6:03 PM CDTMesoscale DiscussionSPCBenton, Boone, Carroll, Madison, Washington27 min
Apr 26, 8:21 PM CDTMesoscale DiscussionSPCAnderson, Atchison, Brown, Chase, Coffey, Doniphan and 16 more54 min
Apr 26, 8:42 PM CDTMesoscale DiscussionSPCAllen, Barber, Butler, Chase, Chautauqua, Comanche and 16 more2 hr
Apr 26, 11:15 PM CDTMesoscale DiscussionSPCAdair, Bates, Carroll, Cass, Chariton, Henry and 10 more60 min

Nearby

Mesoscale Discussions in Oklahoma, 2009Mesoscale Discussions in Missouri, 2009Mesoscale Discussions in Kansas, 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.