Alert archive / Arkansas / Mesoscale Discussions in 2012

Mesoscale Discussion 1605

July 26, 20124 states

The Storm Prediction Center issued this mesoscale discussion at Jul 26, 2012, 1:44 PM CDT for 4 states. It was in force for 3 hr.

The area

The outline as issued.

The facts

Issued
Jul 26, 2012, 1:44 PM CDT (18:44 UTC)
Expired
Jul 26, 2012, 4:15 PM CDT
In force
3 hr
Issued by
the Storm Prediction Center
Chance of a watch
40%
All 56 counties

Baxter County, AR, Boone County, AR, Carroll County, AR, Clay County, AR, Cleburne County, AR, Conway County, AR, Craighead County, AR, Crawford County, AR, Franklin County, AR, Fulton County, AR, Greene County, AR, Independence County, AR, Izard County, AR, Jackson County, AR, Johnson County, AR, Lawrence County, AR, Logan County, AR, Madison County, AR, Marion County, AR, Newton County, AR, Pope County, AR, Randolph County, AR, Scott County, AR, Searcy County, AR, Sebastian County, AR, Sharp County, AR, Stone County, AR, Van Buren County, AR, Washington County, AR, Yell County, AR, Dunklin County, MO, Pemiscot County, MO, Adair County, OK, Atoka County, OK, Cherokee County, OK, Cleveland County, OK, Coal County, OK, Garvin County, OK, Haskell County, OK, Hughes County, OK, Johnston County, OK, Latimer County, OK, LeFlore County, OK, McClain County, OK, McIntosh County, OK, Murray County, OK, Muskogee County, OK, Okfuskee County, OK, Okmulgee County, OK, Pittsburg County, OK, Pontotoc County, OK, Pottawatomie County, OK, Seminole County, OK, Sequoyah County, OK, Wagoner County, OK, Lake County, TN

The radar

The Western Arkansas radar (KSRX), 27 km from the middle of the area, began a volume at 18:47 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

Springfield, MO (KSGF), launched 12:00Z, 6.7 hours before the alert went out and 161 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, Springfield, MO at 12:00Z on 2012-07-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 854 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, Springfield, MO at 12:00Z on 2012-07-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 108 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
854 J/kg
Mixed-layer CIN
-110 J/kg
Mixed-layer LCL
1336 m above ground
0-6 km bulk shear
28 kt
0-1 km storm-relative helicity
108 m²/s²
0-3 km storm-relative helicity
168 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.7

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
Jul 26, 5:27 PM CDTMesoscale DiscussionSPCClark, Clay, Cleburne, Conway, Craighead, Crittenden and 42 more33 min
Jul 26, 5:46 PM CDTSevere Thunderstorm WatchSPCClark, Clay, Cleburne, Conway, Craighead, Crawford and 45 more6 hr
Jul 26, 6:29 PM CDTMesoscale DiscussionSPCClay61 min
Jul 25, 7:21 PM CDTMesoscale DiscussionSPCAtchison54 min
Jul 26, 1:25 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Christian, Crawford and 27 more65 min
Jul 26, 1:46 PM CDTSevere Thunderstorm WatchSPCBarry, Bollinger, Butler, Cape Girardeau, Carter, Christian and 26 more10 hr
Jul 26, 3:55 PM CDTMesoscale DiscussionSPCBollinger, Butler, Cape Girardeau, Carter, Christian, Dent and 23 more35 min
Jul 26, 2:23 PM CDTMesoscale DiscussionSPCJefferson2 hr

Nearby

Mesoscale Discussions in Arkansas, 2012Mesoscale Discussions in Oklahoma, 2012Mesoscale Discussions in Missouri, 2012Every mesoscale discussion in 2012

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.