Alert archive / Arkansas / Mesoscale Discussions in 2007

Mesoscale Discussion 1341

July 1, 200715 counties in Arkansas

The Storm Prediction Center issued this mesoscale discussion at Jul 1, 2007, 2:53 PM CDT for 15 counties in Arkansas. It was in force for 67 min.

The area

The outline as issued.

The facts

Issued
Jul 1, 2007, 2:53 PM CDT (19:53 UTC)
Expired
Jul 1, 2007, 4:00 PM CDT
In force
67 min
Issued by
the Storm Prediction Center

Counties Conway County, AR, Crawford County, AR, Faulkner County, AR, Franklin County, AR, Garland County, AR, Johnson County, AR, Logan County, AR, Montgomery County, AR, Perry County, AR, Pope County, AR, Pulaski County, AR, Saline County, AR, Scott County, AR, Sebastian County, AR, Yell County, AR

The radar

The Western Arkansas radar (KSRX), 76 km from the middle of the area, began a volume at 19:56 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

Springfield, MO (KSGF), launched 12:00Z, 7.9 hours before the alert went out and 199 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 2007-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 123 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 2007-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 square meters per square second.1939Sfc1 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
123 J/kg
Mixed-layer CIN
-40 J/kg
Mixed-layer LCL
758 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
125 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.1

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 1, 2:09 PM CDTMesoscale DiscussionSPCArkansas, Bradley, Chicot, Cleveland, Desha, Drew and 2 more66 min

Nearby

Mesoscale Discussions in Arkansas, 2007Every mesoscale discussion in 2007

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.