Alert archive / Alabama / Special Weather Statements in 2021

Special Weather Statement, NWS Huntsville, AL

October 6, 2021Madison County, Alabama

NWS Huntsville, AL issued this special weather statement at Oct 6, 2021, 9:02 PM CDT for Madison County, Alabama. It was in force for 43 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Oct 6, 2021, 9:02 PM CDT (02:02 UTC)
Expired
Oct 6, 2021, 9:45 PM CDT
In force
43 min
Issued by
NWS Huntsville, AL
Hail
0.25 in
Wind
30

County Madison County, AL

The radar

The Northeast Alabama radar (KHTX), 42 km from the middle of the area, began a volume at 02:05 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, 2.0 hours before the alert went out and 164 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 2021-10-07Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1415 joules per kilogram.LCLEL10008507005003002001001 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 2021-10-07The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 62 square meters per square second.1939587897Sfc1 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
1415 J/kg
Mixed-layer CIN
-6 J/kg
Mixed-layer LCL
923 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
62 m²/s²
0-3 km storm-relative helicity
123 m²/s²
Significant tornado parameter
0.4
Supercell composite
2.8

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Oct 6, 8:57 PM CDT, 5 minutes earlier.

Area forecast discussion, Oct 6, 8:57 PM CDT, 5 minutes before
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Hazardous weather outlook, Oct 6, 2:57 PM CDT, 6 hours 5 minutes before
Hazardous Weather Outlook
National Weather Service Huntsville AL
257 PM CDT Wed Oct 6 2021

ALZ001>010-016-TNZ076-096-097-071100-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
257 PM CDT Wed Oct 6 2021

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

.DAY ONE...Tonight...

Heavy rain and thunderstorms remain possible well into the evening
hours, as an upper disturbance remains in place west of the area. A
few of these storms may be strong to severe, with the potential for
damaging wind gusts, small hail and brief tornadoes, mainly for
locations along and east of the Interstate 65 corridor. The threat
for localized flash flooding also remains in place and a Flash Flood
Watch remains in effect through 1 AM CDT tonight.

.DAYS TWO THROUGH SEVEN...Thursday through Tuesday...

Lingering thunderstorms remain possible for areas along and east of
Interstate 65 Thursday before the thunderstorm threat diminishes
Thursday evening.

.SPOTTER CALL TO ACTION STATEMENT...

Activation of storm spotters and emergency management personnel is
possible late this afternoon and this evening.

In the hours before

Local storm report, Oct 6, 8:06 PM CDT, 56 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE HUNTSVILLE AL
806 PM CDT WED OCT 6 2021

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0735 PM     FLASH FLOOD      1 ESE OWENS CROSSROADS  34.57N 86.44W
10/06/2021                   MADISON            AL   PUBLIC

            FLOODING IN THE BRISTOL CREEK SUBDIVISION IN
            OWENS CROSSROADS.

&&

MA
Special weather statement, Oct 6, 8:13 PM CDT, 49 minutes before
Special Weather Statement
National Weather Service Huntsville AL
813 PM CDT Wed Oct 6 2021

ALZ006>008-070200-
Marshall AL-Madison AL-Morgan AL-
813 PM CDT Wed Oct 6 2021

...A strong thunderstorm will impact portions of central Marshall,
southeastern Madison and southeastern Morgan Counties through 900 PM
CDT...

At 812 PM CDT, Doppler radar was tracking a strong thunderstorm 8
miles northeast of Arab, moving northeast at 15 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor damage to outdoor objects is
         possible.

Locations impacted include...
Southern Huntsville, Guntersville, Arab, Owens Cross Roads, Grant,
Union Grove, Eddy, Columbus City, Ryan Crossroads and Hampton Cove.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm and a Flash
Flood Warning is in effect. Do not drive your vehicle through
flooded roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

A Tornado Watch remains in effect until 1000 PM CDT for north central
and northeastern Alabama.

&&

LAT...LON 3429 8648 3430 8650 3434 8661 3466 8648
      3454 8615 3425 8636
TIME...MOT...LOC 0112Z 210DEG 11KT 3442 8642

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

30
Local storm report, Oct 6, 8:34 PM CDT, 28 minutes before
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Local storm report, Oct 6, 8:42 PM CDT, 20 minutes before
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Local storm report, Oct 6, 8:43 PM CDT, 19 minutes before
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Special weather statement, Oct 6, 9:02 PM CDT, 0 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Oct 6, 7:36 PM CDTSpecial Weather StatementHUNMarshall39 min
Oct 6, 8:13 PM CDTSpecial Weather StatementHUNMarshall47 min
Oct 6, 8:36 PM CDTFlash Flood WarningHUNCullman4 hr
Oct 6, 10:50 PM CDTFlash Flood WarningHUNJackson, Marshall2 hr
Oct 7, 12:50 AM CDTAreal Flood WarningHUNCullman, Jackson, Madison, Marshall8 hr
Oct 7, 8:57 AM CDTAreal Flood WarningHUNCullman111 min

Nearby

Special Weather Statements in Alabama, 2021Every special weather statement in 2021

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.