Alert archive / Alabama / Freeze Watches in 2011

Freeze Watch 1, NWS Mobile, AL

October 29, 2011Choctaw County, Alabama; Wayne County, Mississippi

NWS Mobile, AL issued this freeze watch at Oct 29, 2011, 3:45 PM CDT for Choctaw County, Alabama; Wayne County, Mississippi. It took effect at Oct 31, 2011, 5:00 AM CDT. It was in force for .

The area

The counties it named.

The facts

Issued: Oct 29, 2011, 3:45 PM CDT (20:45 UTC)
In effect from: Oct 31, 2011, 5:00 AM CDT
Expired: Oct 30, 2011, 11:16 AM CDT
In force
Issued by: NWS Mobile, AL

Counties Choctaw County, AL, Wayne County, MS

The radar

The Mobile radar (KMOB), 130 km from the middle of the area, began a volume at 20:48 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 12:00Z, 8.8 hours before the alert went out and 219 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1642 m above ground
0-6 km bulk shear: 44 kt
0-1 km storm-relative helicity: -308 m²/s²
0-3 km storm-relative helicity: -72 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this freeze watch went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Mobile, AL wrote its last area forecast discussion before this freeze watch went out at Oct 29, 12:55 PM CDT, 2 hours 50 minutes earlier.

Area forecast discussion, Oct 29, 12:55 PM CDT, 2 hours 50 minutes before

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Hazardous weather outlook, Oct 29, 3:20 PM CDT, 25 minutes before

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The office that day

Everything else NWS Mobile, AL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Oct 29, 3:06 AM CDT	Wind Advisory	MOB		15 hr
Oct 29, 5:32 PM CDT	Frost Advisory	MOB	Butler, Choctaw, Clarke, Conecuh, Crenshaw, Monroe and 2 more	14 hr

Nearby

Freeze Watches in Alabama, 2011 Freeze Watches in Mississippi, 2011 Every freeze watch in 2011

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.