Alert archive / Tennessee / Mesoscale Discussions in 2009

Mesoscale Discussion 1139

June 15, 20094 states

The Storm Prediction Center issued this mesoscale discussion at Jun 15, 2009, 3:52 PM CDT for 4 states. It was in force for 53 min.

The area

The outline as issued.

The facts

Issued
Jun 15, 2009, 3:52 PM CDT (20:52 UTC)
Expired
Jun 15, 2009, 4:45 PM CDT
In force
53 min
Issued by
the Storm Prediction Center
All 44 counties

Clay County, AR, Craighead County, AR, Fulton County, AR, Greene County, AR, Izard County, AR, Lawrence County, AR, Mississippi County, AR, Poinsett County, AR, Randolph County, AR, Sharp County, AR, Fulton County, KY, Butler County, MO, Dunklin County, MO, New Madrid County, MO, Oregon County, MO, Pemiscot County, MO, Ripley County, MO, Benton County, TN, Carroll County, TN, Chester County, TN, Crockett County, TN, Decatur County, TN, Dickson County, TN, Dyer County, TN, Gibson County, TN, Hardeman County, TN, Hardin County, TN, Haywood County, TN, Henderson County, TN, Henry County, TN, Hickman County, TN, Houston County, TN, Humphreys County, TN, Lake County, TN, Lauderdale County, TN, Lawrence County, TN, Lewis County, TN, Madison County, TN, McNairy County, TN, Obion County, TN, Perry County, TN, Tipton County, TN, Wayne County, TN, Weakley County, TN

The radar

The Memphis radar (KNQA), 72 km from the middle of the area, began a volume at 20:55 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

Little Rock, AR (KLZK), launched 12:00Z, 8.9 hours before the alert went out and 128 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, Little Rock, AR at 12:00Z on 2009-06-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3093 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, Little Rock, AR at 12:00Z on 2009-06-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 137 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
3093 J/kg
Mixed-layer CIN
-7 J/kg
Mixed-layer LCL
630 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
137 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
1.4
Supercell composite
9.9

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
Jun 15, 9:59 AM CDTMesoscale DiscussionSPCClay, Greene, Mississippi, Randolph31 min
Jun 15, 10:34 AM CDTSevere Thunderstorm WatchSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more7 hr
Jun 15, 1:56 PM CDTMesoscale DiscussionSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more64 min
Jun 15, 2:48 PM CDTTornado WatchSPCClay, Craighead, Greene, Lawrence, Mississippi, Poinsett and 1 more3 hr
Jun 15, 4:57 PM CDTMesoscale DiscussionSPCClay, Cleburne, Craighead, Crittenden, Cross, Greene and 11 more63 min
Jun 15, 5:35 PM CDTSevere Thunderstorm WatchSPCCraighead, Crittenden, Cross, Lee, Mississippi, Poinsett and 1 more6 hr
Jun 15, 6:24 AM CDTMesoscale DiscussionSPCBallard, Carlisle, Fulton, Graves, Hickman, McCracken96 min
Jun 14, 10:36 PM CDTMesoscale DiscussionSPCPlatte114 min
Jun 15, 3:55 AM CDTMesoscale DiscussionSPCBates, Benton, Camden, Cass, Cedar, Clay and 14 more65 min
Jun 15, 11:59 AM CDTMesoscale DiscussionSPCBarry, Barton, Bates, Camden, Cedar, Christian and 24 more61 min
Jun 15, 12:52 PM CDTSevere Thunderstorm WatchSPCBarry, Barton, Benton, Camden, Cedar, Christian and 28 more9 hr
Jun 15, 3:47 PM CDTMesoscale DiscussionSPCBarton, Camden, Cedar, Christian, Dade, Dallas and 19 more88 min
Jun 15, 6:50 PM CDTMesoscale DiscussionSPCBarry, Barton, Camden, Cedar, Christian, Crawford and 25 more85 min

Nearby

Mesoscale Discussions in Tennessee, 2009Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Missouri, 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.