Alert archive / Alabama / Mesoscale Discussions in 2007

Mesoscale Discussion 2006

September 22, 20078 counties in Alabama; 4 counties in Florida

The Storm Prediction Center issued this mesoscale discussion at Sep 22, 2007, 2:00 AM CDT for 8 counties in Alabama; 4 counties in Florida. It was in force for 2 hr.

The area

The outline as issued.

The facts

Issued
Sep 22, 2007, 2:00 AM CDT (07:00 UTC)
Expired
Sep 22, 2007, 4:00 AM CDT
In force
2 hr
Issued by
the Storm Prediction Center

Counties Baldwin County, AL, Clarke County, AL, Conecuh County, AL, Covington County, AL, Escambia County, AL, Mobile County, AL, Monroe County, AL, Washington County, AL, Escambia County, FL, Okaloosa County, FL, Santa Rosa County, FL, Walton County, FL

The radar

The Mobile radar (KMOB), 86 km from the middle of the area, began a volume at 07:00 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

Birmingham, AL (KBMX), launched 00:00Z, 7.0 hours before the alert went out and 274 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, Birmingham, AL at 00:00Z on 2007-09-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 336 joules per kilogram.LCLEL10008507005003002001001 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, Birmingham, AL at 00:00Z on 2007-09-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 153 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
336 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
823 m above ground
0-6 km bulk shear
16 kt
0-1 km storm-relative helicity
153 m²/s²
0-3 km storm-relative helicity
144 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

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
Sep 21, 8:57 PM CDTMesoscale DiscussionSPCAutauga, Bibb, Butler, Chilton, Choctaw, Clarke and 14 more93 min
Sep 21, 10:11 PM CDTTornado WatchSPCAutauga, Baldwin, Barbour, Bullock, Butler, Chambers and 23 more6 hr

Nearby

Mesoscale Discussions in Alabama, 2007Mesoscale Discussions in Florida, 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.