Mesoscale Discussion 450

April 11, 2007

The Storm Prediction Center issued this mesoscale discussion at Apr 11, 2007, 1:06 AM CDT. It was in force for 114 min.

The area

The outline as issued.

The facts

Issued: Apr 11, 2007, 1:06 AM CDT (06:06 UTC)
Expired: Apr 11, 2007, 3:00 AM CDT
In force: 114 min
Issued by: the Storm Prediction Center

The radar

The Key West radar (KBYX), 65 km from the middle of the area, began a volume at 06:07 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

Key West, FL (KEYW), launched 00:00Z, 6.1 hours before the alert went out and 69 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 1520 J/kg
Mixed-layer CIN: -32 J/kg
Mixed-layer LCL: 925 m above ground
0-6 km bulk shear: 53 kt
0-1 km storm-relative helicity: 213 m²/s²
0-3 km storm-relative helicity: 238 m²/s²
Significant tornado parameter: 2.1
Supercell composite: 11.1

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

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Nearby

Every 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.