Alert archive / Alabama / Severe Thunderstorm Warnings in 2007

Severe Thunderstorm Warning 76, NWS Huntsville, AL

July 1, 2007Cullman County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 1, 2007, 2:21 PM CDT for Cullman County, Alabama. It was in force for 39 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 1, 2007, 2:21 PM CDT (19:21 UTC)
Expired
Jul 1, 2007, 3:00 PM CDT
In force
39 min
Issued by
NWS Huntsville, AL
Area
Counties, with a storm outline in the text

County Cullman County, AL

The radar

The Birmingham radar (KBMX), 107 km from the middle of the area, began a volume at 19:24 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
Jul 1, 12:10 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 7.4 hours before the alert went out and 106 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, Birmingham, AL at 12:00Z on 2007-07-01Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 851 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, Birmingham, AL at 12:00Z on 2007-07-01The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -14 square meters per square second.1939Sfc1 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
851 J/kg
Mixed-layer CIN
-114 J/kg
Mixed-layer LCL
1313 m above ground
0-6 km bulk shear
10 kt
0-1 km storm-relative helicity
-14 m²/s²
0-3 km storm-relative helicity
7 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 1, 1:20 PM CDT, 1 hour 1 minute earlier.

Area forecast discussion, Jul 1, 1:20 PM CDT, 1 hour 1 minute before
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE HUNTSVILLE AL
120 PM CDT SUN JUL 1 2007

.DISCUSSION...
CONVECTION CONTINUING TO FOCUS ALONG A WEAK FRONTAL BOUNDARY DRAPED
ACROSS TN AND RESIDUAL OUTFLOW BOUNDARIES FROM AN OVERNIGHT MCS
ACROSS WEST TN. SUFFICIENT INSTABILITY/MOISTURE EXISTS FOR THIS
CONVECTION TO CONTINUE EXPANDING EWRD ACROSS THE AREA THROUGH PEAK
HEATING. DEVELOPMENT THUS FAR CARRYING A BIT MORE EWRD MOVEMENT THAN
IN RECENT DAYS...AND THE STEEP LAPSE RATES WILL CONTINUE TO SUPPORT
STRONG UPDRAFTS AND A RISK OF ISLTD MICROBURSTS/WIND DAMAGE INTO THE
EVNG. CURRENTLY PLANNING A LOW END SCTD POP FOR THE EVNG
HOURS...UNLESS LAST MINUTE RADAR TRENDS DICTATE OTHERWISE. PCPN
COVERAGE WILL DIMINISH FOLLOWING SUNSET... ALTHOUGH WITH THE SFC
BOUNDARY STILL IN THE VICINITY...WOULD NOT RULE OUT AN ISLTD STORM
OR TWO LINGERING WELL PAST MIDNIGHT.

THE AFOREMENTIONED WEAK FRONTAL BOUNDARY WILL CONTINUE TO SLOWLY
SAG SOUTHWARD AND ACROSS THE HUN CWFA BY MONDAY. WHILE SLIGHTLY
DRIER AIR (MID 60S DEWPTS) MAY FILTER IN THROUGH THE DAY...ENOUGH
CONDITIONAL INSTABILITY WILL STILL EXIST FOR POTENTIAL DIURNAL
CONVECTIVE DEVELOPMENT WITH THE ASSISTANCE OF ANY LINGERING
MESOSCALE/OUTFLOW BOUNDARIES. BOTH THE 12Z NAM AND GFS SUGGEST SOME
TYPE OF WEAK CONVERGENCE ZONE/INVERTED TROUGH MOVING FROM EAST TO
WEST THROUGH DURING PEAK HEATING...WITH THE NAM MORE ROBUST IN
DEVELOPING SCTD CONVECTION ALONG THIS BOUNDARY. WITH DEEPER
MOISTURE FOCUSED TOWARD THE SOUTH...BETTER PCPN CHANCES WILL
CONSEQUENTLY LIE SOUTH OF THE TN RIVER...AND WILL TAPER POPS
ACCORDINGLY FROM SOUTH TO NORTH. THERMAL PROFILE NOT NEARLY AS
FAVORABLE FOR WET MICROBURSTS AS IN RECENT DAYS WITH THE
DEEPER/DRIER NORTHERLY FLOW IN PLACE...BUT A FEW STRONGER WIND
GUSTS WILL REMAIN POSSIBLE.

ISLTD DIURNAL CONVECTION WILL REMAIN A POSSIBILITY THROUGH
MID-WEEK...AS A WEAK SHEAR AXIS/CONVERGENCE ZONE LINGERS NEAR THE
AREA. DAYTIME TEMPERATURES WILL CONTINUE TO RUN SEVERAL DEGREES
ABOVE GUIDANCE...WITH HIGHS GENERALLY IN THE LWR/MID 90S THROUGH
THE PERIOD.

BY THE END OF THE WEEK...GFS SUGGESTING ANOTHER POTENTIAL
FRONTAL PASSAGE...BUT GIVEN THE TIME OF YEAR WILL REMAIN
SKEPTICAL...AND JUST MAINTAIN 20/30 PERCENT POPS TO COVER THE
TYPICAL DIURNAL ACTIVITY THAT WILL ACCOMPANY A PREDOMINANT U/L
NWERLY FLOW CONTAINING EMBEDDED SHORTWAVES. DAYTIME TEMPERATURES
WILL CONTINUE ABOVE NORMAL...WITH OVERNIGHT LOWS SEASONABLE...INTO
NEXT WEEKEND.

&&

.PRELIMINARY POINT TEMPS/POPS...
HUNTSVILLE    70  92  68  91 /  30  20  10  20
SHOALS        70  93  68  92 /  30  20  10  20
CULLMAN       70  90  68  89 /  30  30  10  20
FAYETTEVILLE  68  91  66  90 /  30  20  10  20
ALBERTVILLE   69  90  66  89 /  30  30  10  20
FORT PAYNE    68  91  65  89 /  30  30  10  20

&&

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

10
Hazardous weather outlook, Jul 1, 12:52 PM CDT, 1 hour 29 minutes before
HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE HUNTSVILLE AL
1252 PM CDT SUN JUL 1 2007

ALZ001>010-016-TNZ076-096-097-020300-
LAUDERDALE-COLBERT-FRANKLIN AL-LAWRENCE-LIMESTONE-MADISON-MORGAN-
MARSHALL-JACKSON-DE KALB-CULLMAN-MOORE-LINCOLN-FRANKLIN TN-
1252 PM CDT SUN JUL 1 2007

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

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

SCATTERED SHOWERS AND THUNDERSTORMS WILL DEVELOP AGAIN THIS
AFTERNOON AND PERSIST WELL INTO THE EVENING HOURS. LIKE PREVIOUS
DAYS...SEVERAL STRONG TO SEVERE THUNDERSTORMS CAN BE EXPECTED...WITH
THE PRIMARY THREAT FROM THESE STORMS BEING GUSTY OR DAMAGING
STRAIGHT LINE WINDS.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY...

THE PROBABILITY FOR WIDESPREAD HAZARDOUS WEATHER IS LOW.

TYPICAL ISOLATED AFTERNOON AND EVENING SHOWERS AND THUNDERSTORMS
WILL REMAIN IN THE FORECAST FOR MUCH OF THE UPCOMING WORK WEEK. A
STRONGER THUNDERSTORM CAPABLE OF PRODUCING GUSTY WINDS CANNOT BE
RULED OUT ON ANY OF THESE DAYS...BUT WIDESPREAD STRONG TO SEVERE
STORMS ARE NOT ANTICIPATED.

.SPOTTER CALL TO ACTION STATEMENT...

ACTIVATION OF STORM SPOTTERS AND EMERGENCY MANAGEMENT PERSONNEL
IS NOT ANTICIPATED AT THIS TIME.

In the hours before

Special weather statement, Jul 1, 1:28 PM CDT, 53 minutes before
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Special weather statement, Jul 1, 1:42 PM CDT, 39 minutes before
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Local storm report, Jul 1, 1:45 PM CDT, 36 minutes before
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Special weather statement, Jul 1, 1:50 PM CDT, 31 minutes before
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Special weather statement, Jul 1, 2:06 PM CDT, 15 minutes before
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Special weather statement, Jul 1, 2:09 PM CDT, 12 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 1, 12:14 PM CDTSevere Thunderstorm WarningHUNLawrence31 min
Jul 1, 12:44 PM CDTSevere Thunderstorm WarningHUNLawrence31 min
Jul 1, 12:46 PM CDTSevere Thunderstorm WarningHUNMadison29 min
Jul 1, 1:22 PM CDTSevere Thunderstorm WarningHUNLimestone23 min
Jul 1, 1:26 PM CDTSevere Thunderstorm WarningHUNLawrence, Morgan34 min
Jul 1, 1:33 PM CDTSevere Thunderstorm WarningHUNMadison27 min
Jul 1, 1:40 PM CDTSevere Thunderstorm WarningHUNLimestone, Morgan35 min
Jul 1, 2:00 PM CDTSevere Thunderstorm WarningHUNMadison30 min
Jul 1, 2:34 PM CDTSevere Thunderstorm WarningHUNMarshall26 min
Jul 1, 2:44 PM CDTSevere Thunderstorm WarningHUNJackson31 min
Jul 1, 3:18 PM CDTSevere Thunderstorm WarningHUNDeKalb27 min
Jul 1, 4:29 PM CDTFlash Flood WarningHUNDeKalb61 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.