Alert archive / Alabama / Severe Thunderstorm Warnings in 2014

Severe Thunderstorm Warning 87, NWS Huntsville, AL

July 23, 2014Colbert County, Lauderdale County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 23, 2014, 3:48 PM CDT for Colbert County, Lauderdale County, Alabama. It was in force for 42 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: Jul 23, 2014, 3:48 PM CDT (20:48 UTC)
Expired: Jul 23, 2014, 4:30 PM CDT
In force: 42 min
Issued by: NWS Huntsville, AL
Area: Storm-based polygon

Counties Colbert County, AL, Lauderdale County, AL

The radar

The Columbus AFB radar (KGWX), 115 km from the middle of the area, began a volume at 20:47 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

Nashville Metro, TN (KBNA), launched 12:00Z, 8.8 hours before the alert went out and 180 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: 1248 J/kg
Mixed-layer CIN: -30 J/kg
Mixed-layer LCL: 883 m above ground
0-6 km bulk shear: 9 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 18 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 Jul 23, 12:47 PM CDT, 3 hours 1 minute earlier.

Area forecast discussion, Jul 23, 12:47 PM CDT, 3 hours 1 minute before

AREA FORECAST DISCUSSION...UPDATED
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1247 PM CDT WED JUL 23 2014

.UPDATE...
FOR 18Z TAFS

&&

.DISCUSSION...
/ISSUED 926 AM CDT WED JUL 23 2014/
NO MAJOR CHANGES TO THE FCST ATTM...JUST REMOVED THE FOG ADVISORY
FOR NE AL. OTHERWISE TEMPS ARE ALREADY IN THE LOW 80S FOR SEVERAL
LOCATIONS. LOOKS LIKE A HOT/HUMID DAY COMING UP WITH SCT SHRA/TSRA
MAINLY DURING THE AFTN/EVENING HOURS. NO SVR WX EXPECTED BUT CANT
RULE OUT GUSTY WINDS/BRIEF HVY RAIN IN A FEW STORMS THAT DO DEVELOP.

07

&&

.AVIATION...
FOR 18Z TAFS...COMBINATION OF WEAK SFC BOUNDARY AND UPPER LEVEL
TROUGH WILL MAINTAIN UNSETTLED WEATHER ACROSS THE REGION OVER THE
NEXT 48 HOURS. AT BOTH TAF SITES HAVE KEPT PREDOMINANT VFR CONDITIONS
WITH VICINITY SHOWERS THROUGH THE PERIOD TO ACCOUNT FOR UNCERTAINTY.
ALSO KEPT A WINDOW OF THUNDERSTORM POTENTIONAL WITH MVFR VSBYS
THROUGH MID AFTN AT KHSV BASED ON CURRENT RADAR AND MESOSCALE TRENDS.
MODEL GUIDANCE INDICATES A HIGH PROBABILITY OF CONVECTION LATE
TONIGHT/EARLY THURSDAY AND INCLUDED A WINDOW OF MVFR CONDITIONS DUE
TO THUNDERSTORMS DURING THAT PERIOD. OVERALL WIND FIELD SHOULD BE
LIGHT ASIDE FROM BRIEFLY TURBULENT WITHIN/NEAR THUNDERSTORMS.

15

&&

.HUN WATCHES/WARNINGS/ADVISORIES...
AL...NONE.
TN...NONE.
&&

FOR MORE INFORMATION PLEASE VISIT OUR WEBSITE
AT WEATHER.GOV/HUNTSVILLE.

Hazardous weather outlook, Jul 23, 3:11 PM CDT, 37 minutes before

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In the hours before

Local storm report, Jul 23, 1:15 PM CDT, 2 hours 33 minutes before

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Special weather statement, Jul 23, 1:35 PM CDT, 2 hours 13 minutes before

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Special weather statement, Jul 23, 1:50 PM CDT, 1 hour 58 minutes before

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Special weather statement, Jul 23, 2:08 PM CDT, 1 hour 40 minutes before

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Special weather statement, Jul 23, 2:49 PM CDT, 59 minutes before

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Special weather statement, Jul 23, 3:28 PM CDT, 20 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
Jul 22, 7:00 PM CDT	Special Weather Statement	HUN	Madison	30 min
Jul 23, 6:19 AM CDT	Dense Fog Advisory	HUN	DeKalb, Jackson, Madison, Marshall	3 hr
Jul 23, 11:15 AM CDT	Special Weather Statement	HUN	Limestone	45 min
Jul 23, 11:33 AM CDT	Flash Flood Warning	HUN	Lauderdale, Limestone	117 min
Jul 23, 11:46 AM CDT	Special Weather Statement	HUN	Limestone	44 min
Jul 23, 12:15 PM CDT	Flash Flood Warning	HUN	Limestone	2 hr
Jul 23, 12:52 PM CDT	Special Weather Statement	HUN	Limestone	38 min
Jul 23, 12:59 PM CDT	Flash Flood Warning	HUN	Limestone, Madison	2 hr
Jul 23, 1:35 PM CDT	Special Weather Statement	HUN	Lawrence	40 min
Jul 23, 1:50 PM CDT	Special Weather Statement	HUN	Morgan	25 min
Jul 23, 2:08 PM CDT	Special Weather Statement	HUN	DeKalb	37 min
Jul 23, 2:49 PM CDT	Special Weather Statement	HUN	DeKalb	26 min
Jul 23, 3:28 PM CDT	Special Weather Statement	HUN	Lauderdale	32 min
Jul 23, 4:29 PM CDT	Special Weather Statement	HUN	Franklin	31 min
Jul 23, 4:34 PM CDT	Special Weather Statement	HUN	Colbert	26 min
Jul 23, 5:02 PM CDT	Special Weather Statement	HUN	Franklin	28 min
Jul 23, 5:29 PM CDT	Special Weather Statement	HUN	Franklin	16 min
Jul 22, 7:38 PM CDT	Special Weather Statement	HUN	Lincoln, Moore	52 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2014 Every severe thunderstorm warning in 2014

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.