Alert archive / Alabama / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 130, NWS Huntsville, AL

July 13, 2017Cullman County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jul 13, 2017, 7:00 PM CDT for Cullman County, Alabama. It was in force for 30 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 13, 2017, 7:00 PM CDT (00:00 UTC)
Expired
Jul 13, 2017, 7:30 PM CDT
In force
30 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

County Cullman County, AL

The radar

The Birmingham radar (KBMX), 107 km from the middle of the area, began a volume at 00:04 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 00:00Z, 0.0 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 00:00Z on 2017-07-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 901 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 00:00Z on 2017-07-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 12 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
901 J/kg
Mixed-layer CIN
-9 J/kg
Mixed-layer LCL
1556 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
12 m²/s²
0-3 km storm-relative helicity
13 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 13, 6:38 PM CDT, 22 minutes earlier.

Area forecast discussion, Jul 13, 6:38 PM CDT, 22 minutes before
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Hazardous weather outlook, Jul 13, 12:20 PM CDT, 6 hours 40 minutes before
Hazardous Weather Outlook
National Weather Service Huntsville AL
1220 PM CDT Thu Jul 13 2017

ALZ001>010-016-TNZ076-096-097-141100-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-De Kalb-Cullman-Moore-Lincoln-Franklin TN-
1220 PM CDT Thu Jul 13 2017

This Hazardous Weather Outlook is for north Alabama and portions of
southern middle Tennessee.

.DAY ONE...This Afternoon and Tonight...

Scattered thunderstorms are possible today and tonight. Due to slow
movement, a few areas could receive locally very heavy rainfall leading
to brief flash flooding. In addition, frequent lightning and brief
gusty winds up to 40 mph are possible.

.DAYS TWO THROUGH SEVEN...Friday through Wednesday...

Scattered, mainly afternoon, thunderstorms are expected again Friday
through Wednesday.

A few of the thunderstorms will produce gusty winds, frequent
lightning and locally heavy downpours. The greatest risk of strong
thunderstorms will be Friday into Saturday as a frontal system drops
south into the region.

.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 13, 4:35 PM CDT, 2 hours 25 minutes before
Special Weather Statement
National Weather Service Huntsville AL
435 PM CDT THU JUL 13 2017

ALZ009-010-132200-
De Kalb AL-Jackson AL-
435 PM CDT THU JUL 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR EAST CENTRAL JACKSON AND
NORTHEASTERN DEKALB COUNTIES UNTIL 500 PM CDT...

At 435 PM CDT, Doppler radar was tracking a strong thunderstorm near
Ider, or 11 miles southwest of Trenton, moving northeast at 25 mph.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Henagar, Ider, Hammondville, Flat Rock, Higdon, Sulpher Springs and
Rosalie.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong gusty winds will be capable of knocking down small tree limbs
along with other small unsecured items. Seek safe shelter until this
storm has passed.

Very heavy rainfall is also occurring with this storm and may lead to
localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3458 8566 3471 8582 3498 8560 3467 8554
TIME...MOT...LOC 2135Z 220DEG 23KT 3474 8564

AMP
Special weather statement, Jul 13, 6:21 PM CDT, 39 minutes before
Special Weather Statement
National Weather Service Huntsville AL
621 PM CDT THU JUL 13 2017

ALZ007-016-132345-
Morgan AL-Cullman AL-
621 PM CDT THU JUL 13 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL CULLMAN AND SOUTHEASTERN
MORGAN COUNTIES UNTIL 645 PM CDT...

At 619 PM CDT, Doppler radar was tracking a cluster of strong
thunderstorms from near Cullman to near Colony, moving north at 20
mph.

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

Locations impacted include...
Cullman, Hanceville, Good Hope, Falkville, Dodge City, Baldwin,
Vinemont, West Point, Eva and Garden City.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Strong gusty winds will be capable of knocking down small tree limbs
along with other small unsecured items. Seek safe shelter until this
storm has passed.

Very heavy rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways. This includes much of Interstate 65 between milemarkers
210 and 189.

&&

LAT...LON 3439 8699 3438 8661 3408 8669 3409 8669
      3408 8670 3406 8669 3406 8671 3403 8670
      3403 8672 3395 8679 3396 8682 3394 8682
      3395 8685 3393 8686 3394 8688 3392 8689
      3391 8692
TIME...MOT...LOC 2319Z 187DEG 20KT 3416 8683

AMP
Special weather statement, Jul 13, 6:26 PM CDT, 34 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jul 13, 7:50 PM CDTSpecial Weather StatementHUNLawrence40 min
Jul 14, 1:08 PM CDTSpecial Weather StatementHUNMarshall37 min
Jul 14, 1:46 PM CDTSpecial Weather StatementHUNMarshall29 min
Jul 14, 2:39 PM CDTSpecial Weather StatementHUNCullman36 min
Jul 14, 2:45 PM CDTSpecial Weather StatementHUNDeKalb30 min
Jul 14, 3:19 PM CDTSpecial Weather StatementHUNLauderdale26 min
Jul 14, 3:46 PM CDTAreal Flood WarningHUNColbert, Lauderdale6 hr
Jul 14, 3:58 PM CDTSpecial Weather StatementHUNCullman62 min
Jul 14, 6:17 PM CDTSpecial Weather StatementHUNMorgan43 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2017Every severe thunderstorm warning 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.