Alert archive / Arkansas / Mesoscale Discussions in 2009

Mesoscale Discussion 284

March 26, 20095 counties in Arkansas; 4 counties in Oklahoma

The Storm Prediction Center issued this mesoscale discussion at Mar 26, 2009, 9:28 PM CDT for 5 counties in Arkansas; 4 counties in Oklahoma. It was in force for 62 min.

The area

The outline as issued.

The facts

Issued
Mar 26, 2009, 9:28 PM CDT (02:28 UTC)
Expired
Mar 26, 2009, 10:30 PM CDT
In force
62 min
Issued by
the Storm Prediction Center

Counties Howard County, AR, Montgomery County, AR, Polk County, AR, Scott County, AR, Sevier County, AR, Choctaw County, OK, LeFlore County, OK, McCurtain County, OK, Pushmataha County, OK

The radar

The Western Arkansas radar (KSRX), 115 km from the middle of the area, began a volume at 02:31 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

Shreveport, LA (KSHV), launched 00:00Z, 2.5 hours before the alert went out and 211 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, Shreveport, LA at 00:00Z on 2009-03-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 936 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, Shreveport, LA at 00:00Z on 2009-03-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 78 square meters per square second.1939587897117Sfc1 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
936 J/kg
Mixed-layer CIN
-20 J/kg
Mixed-layer LCL
949 m above ground
0-6 km bulk shear
52 kt
0-1 km storm-relative helicity
78 m²/s²
0-3 km storm-relative helicity
219 m²/s²
Significant tornado parameter
0.9
Supercell composite
5.5

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
Mar 27, 12:33 PM CDTMesoscale DiscussionSPCHempstead, Howard, Lafayette, Little River, Miller, Sevier57 min
Mar 27, 12:58 PM CDTTornado WatchSPCHoward, Little River, Miller, Sevier7 hr
Mar 27, 3:34 PM CDTMesoscale DiscussionSPCHoward, Little River, Miller, Sevier56 min
Mar 27, 5:53 PM CDTMesoscale DiscussionSPCAshley, Bradley, Calhoun, Chicot, Clark, Cleveland and 16 more97 min
Mar 27, 6:35 PM CDTTornado WatchSPCArkansas, Ashley, Bradley, Calhoun, Chicot, Clark and 27 more7 hr
Mar 26, 7:32 PM CDTSevere Thunderstorm WatchSPCAtoka, Bryan, Carter, Coal, Jefferson, Johnston and 3 more4 hr
Mar 26, 11:34 PM CDTMesoscale DiscussionSPCCimarron, Texas4 hr
Mar 27, 2:55 AM CDTMesoscale DiscussionSPCBeaver, Cimarron, Texas4 hr
Mar 27, 6:50 AM CDTMesoscale DiscussionSPCAlfalfa, Blaine, Canadian, Creek, Dewey, Garfield and 14 more85 min
Mar 27, 8:04 AM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Custer, Dewey, Ellis and 7 more4 hr
Mar 27, 12:30 PM CDTMesoscale DiscussionSPCAlfalfa, Beaver, Beckham, Blaine, Caddo, Canadian and 19 more6 hr

Nearby

Mesoscale Discussions in Arkansas, 2009Mesoscale Discussions in Oklahoma, 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.