Alert archive / Alabama / Special Weather Statements in 2017

Special Weather Statement, NWS Mobile, AL

July 17, 2017Marengo County, Alabama

NWS Mobile, AL issued this special weather statement at Jul 17, 2017, 5:31 PM CDT for Marengo County, Alabama. It was in force for 44 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Jul 17, 2017, 5:31 PM CDT (22:31 UTC)
Expired: Jul 17, 2017, 6:15 PM CDT
In force: 44 min
Issued by: NWS Mobile, AL

County Marengo County, AL

The radar

The Birmingham radar (KBMX), 160 km from the middle of the area, began a volume at 22:31 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

Birmingham, AL (KBMX), launched 12:00Z, 10.5 hours before the alert went out and 160 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: 871 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 772 m above ground
0-6 km bulk shear: 10 kt
0-1 km storm-relative helicity: -17 m²/s²
0-3 km storm-relative helicity: -11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 17, 3:49 PM CDT, 1 hour 42 minutes earlier.

Area forecast discussion, Jul 17, 3:49 PM CDT, 1 hour 42 minutes before

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Hazardous weather outlook, Jul 17, 4:40 PM CDT, 51 minutes before

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In the hours before

Special weather statement, Jul 17, 5:31 PM CDT, 0 minutes before

Special Weather Statement
National Weather Service Mobile AL
531 PM CDT MON JUL 17 2017

ALZ051-053-054-172315-
Clarke AL-Wilcox AL-Choctaw AL-
531 PM CDT MON JUL 17 2017

...A CLUSTER OF STRONG THUNDERSTORMS WILL AFFECT THE FOLLOWING
COUNTIES...NORTHEASTERN CHOCTAW...NORTH CENTRAL CLARKE AND
SOUTHWESTERN WILCOX COUNTIES UNTIL 615 PM CDT...

At 529 PM CDT, the strong thunderstorms were located along a line
extending from 5 miles northeast of Butler to 4 miles northwest of
Thomasville to near Pine Hill, and moving northwest at 10 mph.

Winds in excess of 40 mph will be possible with these storms.

Locations impacted include...
Thomasville, Butler, Pine Hill, Pennington, and Morvin.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with these storms, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with these storms.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3200 8795 3199 8795 3200 8763 3213 8761
      3203 8749 3186 8746 3192 8791 3208 8824
      3231 8830 3231 8798 3228 8802 3209 8804
      3205 8812 3200 8807 3230 8794 3231 8796
      3231 8793
TIME...MOT...LOC 2229Z 141DEG 7KT 3212 8804 3199 8781 3194 8756

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 16, 10:22 PM CDT	Areal Flood Advisory	MOB	Mobile	113 min
Jul 16, 11:59 PM CDT	Areal Flood Advisory	MOB	Mobile	3 hr
Jul 17, 6:18 PM CDT	Special Weather Statement	MOB	Choctaw	42 min
Jul 17, 6:49 PM CDT	Special Weather Statement	MOB	Choctaw	26 min
Jul 17, 2:50 AM CDT	Areal Flood Advisory	MOB	Okaloosa	3 hr

Nearby

Special Weather Statements in Alabama, 2017 Every special weather statement in 2017

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.