Alert archive / Alabama / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 129, NWS Huntsville, AL

October 18, 2007Colbert County, Franklin County, Lauderdale County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Oct 18, 2007, 10:18 PM CDT for Colbert County, Franklin County, Lauderdale County, Alabama. It was in force for 57 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
Oct 18, 2007, 10:18 PM CDT (03:18 UTC)
Expired
Oct 18, 2007, 11:15 PM CDT
In force
57 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon

Counties Colbert County, AL, Franklin County, AL, Lauderdale County, AL

The radar

The Columbus AFB radar (KGWX), 101 km from the middle of the area, began a volume at 03:20 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.

IssuedProductOfficeLasted
Oct 18, 1:31 PM CDTTornado WatchSPC9 hr

The nearest sounding before it

Nashville Metro, TN (KBNA), launched 00:00Z, 3.3 hours before the alert went out and 193 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, Nashville Metro, TN at 00:00Z on 2007-10-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1487 joules per kilogram.LCLLFCEL10008507005003002001001 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, Nashville Metro, TN at 00:00Z on 2007-10-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 259 square meters per square second.1939587897117Sfc1 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
1487 J/kg
Mixed-layer CIN
-10 J/kg
Mixed-layer LCL
778 m above ground
0-6 km bulk shear
56 kt
0-1 km storm-relative helicity
259 m²/s²
0-3 km storm-relative helicity
337 m²/s²
Significant tornado parameter
2.8
Supercell composite
10.5

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 Oct 18, 3:25 PM CDT, 6 hours 53 minutes earlier.

Area forecast discussion, Oct 18, 3:25 PM CDT, 6 hours 53 minutes before
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Hazardous weather outlook, Oct 18, 1:01 PM CDT, 9 hours 17 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
101 PM CDT THU OCT 18 2007

ALZ001>010-016-TNZ076-096-097-190615-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DE KALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
101 PM CDT THU OCT 18 2007

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

.DAY ONE...TONIGHT...

THERE IS A SLIGHT RISK OF SEVERE THUNDERSTORMS...INCLUDING
DAMAGING WINDS AND ISOLATED TORNADOES THIS AFTERNOON IN NORTHWEST
ALABAMA...AND TONIGHT OVER THE ENTIRE AREA.

THE COMBINATION OF SURFACE HEATING AND AN INFLUX OF GULF MOISTURE
WILL LEAD TO THE DEVELOPMENT OF SCATTERED THUNDERSTORMS THIS
AFTERNOON...MAINLY WEST OF INTERSTATE 65. ANY STORMS THAT DEVELOP
WILL BE STEERED QUICKLY TO THE NORTHEAST AT ABOUT 35 MPH. THESE
STORMS MAY BE CAPABLE OF PRODUCING DAMAGING WINDS...SMALL
HAIL...AND EVEN ISOLATED TORNADOES.

A COLD FRONT WILL SWEEP ACROSS THE REGION TONIGHT...PRODUCING A
LINE OF THUNDERSTORMS POSING A THREAT FOR DAMAGING WINDS AND
ISOLATED TORNADOES. THE FRONT AND STORM THREAT SHOULD PUSH INTO
NORTHWEST ALABAMA BY MID TO LATE EVENING...CROSSING THE I-65
CORRIDOR AROUND MIDNIGHT...AND THEN PUSHING OUT OF NORTHEAST
ALABAMA AND SOUTH CENTRAL TENNESSEE BEFORE SUNRISE.

RESIDENTS OF THE TENNESSEE VALLEY SHOULD MONITOR FUTURE UPDATED ON
THE DEVELOPING WEATHER SITUATION.

.DAYS TWO THROUGH SEVEN...FRIDAY THROUGH WEDNESDAY...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

A COLD FRONT IS EXPECTED TO MOVE THROUGH THE TENNESSEE VALLEY
EARLY NEXT WEEK...BRINGING ANOTHER ROUND OF SHOWERS AND
THUNDERSTORMS TO THE AREA. GREAT UNCERTAINTY STILL EXISTS WITH THE
TIMING OF THIS FRONT. AT THIS TIME...THE FRONTAL PASSAGE LOOKS
MOST LIKELY TO OCCUR LATE MONDAY INTO EARLY TUESDAY.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL
MAY BE REQUIRED THIS EVENING AND OVERNIGHT.

CBD

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 18, 11:17 PM CDTSevere Thunderstorm WarningHUNColbert, Franklin, Lauderdale43 min
Oct 18, 11:44 PM CDTSevere Thunderstorm WarningHUNLawrence, Limestone46 min
Oct 18, 11:59 PM CDTSevere Thunderstorm WarningHUNFranklin, Lawrence37 min
Oct 19, 12:26 AM CDTSevere Thunderstorm WarningHUNLawrence, Limestone, Morgan49 min
Oct 19, 12:43 AM CDTSevere Thunderstorm WarningHUNMadison30 min
Oct 19, 12:49 AM CDTSevere Thunderstorm WarningHUNJackson22 min
Oct 19, 12:05 AM CDTSevere Thunderstorm WarningHUNLincoln40 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2007Every severe thunderstorm warning 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.