Alert archive / Alabama / Severe Thunderstorm Warnings in 2011

Severe Thunderstorm Warning 196, NWS Huntsville, AL

June 18, 2011DeKalb County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jun 18, 2011, 3:48 PM CDT for DeKalb County, Alabama. It was in force for 20 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 18, 2011, 3:48 PM CDT (20:48 UTC)
Expired: Jun 18, 2011, 4:08 PM CDT
In force: 20 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

County DeKalb County, AL

The radar

The Northeast Alabama radar (KHTX), 58 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Jun 18, 9:39 AM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 8.8 hours before the alert went out and 171 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: 1149 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 704 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 23 m²/s²
0-3 km storm-relative helicity: 33 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 severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Huntsville, AL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 18, 3:00 PM CDT, 48 minutes earlier.

Area forecast discussion, Jun 18, 3:00 PM CDT, 48 minutes before

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Hazardous weather outlook, Jun 18, 10:16 AM CDT, 5 hours 32 minutes before

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1016 AM CDT SAT JUN 18 2011

ALZ001>010-016-TNZ076-096-097-190215-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DEKALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
1016 AM CDT SAT JUN 18 2011

THIS HAZARDOUS WEATHER OUTLOOK IS FOR NORTH ALABAMA AND PORTIONS
OF SOUTHERN MIDDLE TENNESSEE.

.DAY ONE...THIS AFTERNOON AND TONIGHT...

A CLUSTER OF SHOWERS AND THUNDERSTORMS WILL MOVE ACROSS THE AREA THIS
AFTERNOON. SOME THUNDERSTORMS WILL BECOME STRONG TO SEVERE...CAPABLE
OF PRODUCING DAMAGING WIND GUSTS...HAIL UP TO THE SIZE OF QUARTERS...
HEAVY RAIN AND FREQUENT LIGHTNING. THE SEVERE THREAT WILL BEGIN TO
DIMINISH AROUND 7 PM THIS EVENING.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY...

THE THREAT FOR THUNDERSTORMS WILL DIMINISH AS HIGH PRESSURE BUILDS
ACROSS THE REGION. HOWEVER...AFTERNOON HEAT INDEX VALUES WILL RISE
INTO THE 100 TO 105 DEGREE RANGE SUNDAY THROUGH TUESDAY.

ANOTHER CHANCE OF SHOWERS AND THUNDERSTORMS IS EXPECTED WEDNESDAY
NIGHT INTO THURSDAY AS A COLD FRONT MOVES INTO THE REGION.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL IS
POSSIBLE THIS AFTERNOON...MAINLY ACROSS SOUTHERN MIDDLE TENNESSEE AND
NORTHEAST ALABAMA.

SS

In the hours before

Local storm report, Jun 18, 2:42 PM CDT, 1 hour 6 minutes before

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Special weather statement, Jun 18, 3:12 PM CDT, 36 minutes before

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Local storm report, Jun 18, 3:36 PM CDT, 12 minutes before

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Special weather statement, Jun 18, 3:41 PM CDT, 7 minutes before

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Special weather statement, Jun 18, 3:44 PM CDT, 4 minutes before

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The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 18, 2:18 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison	42 min
Jun 18, 2:26 PM CDT	Severe Thunderstorm Warning	HUN	Jackson, Madison	33 min
Jun 18, 2:37 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson, Madison	53 min
Jun 18, 2:44 PM CDT	Severe Thunderstorm Warning	HUN	Limestone, Madison, Morgan	25 min
Jun 18, 3:12 PM CDT	Special Weather Statement	HUN	Lawrence	48 min
Jun 18, 3:28 PM CDT	Severe Thunderstorm Warning	HUN	DeKalb, Jackson	36 min
Jun 18, 3:41 PM CDT	Special Weather Statement	HUN	Etowah	49 min
Jun 18, 3:44 PM CDT	Special Weather Statement	HUN	Cullman	46 min
Jun 18, 1:32 PM CDT	Severe Thunderstorm Warning	HUN	Franklin, Lincoln, Moore	58 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2011 Every severe thunderstorm warning 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.