Alert archive / Alabama / Severe Thunderstorm Warnings in 2018

Severe Thunderstorm Warning 91, NWS Huntsville, AL

June 28, 2018DeKalb County, Marshall County, Morgan County, Alabama

NWS Huntsville, AL issued this severe thunderstorm warning at Jun 28, 2018, 1:05 PM CDT for DeKalb County, Marshall County, Morgan County, Alabama. It was in force for 55 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
Jun 28, 2018, 1:05 PM CDT (18:05 UTC)
Expired
Jun 28, 2018, 2:00 PM CDT
In force
55 min
Issued by
NWS Huntsville, AL
Area
Storm-based polygon
Hail
0.75 in
Wind
70.0 mph

Counties DeKalb County, AL, Marshall County, AL, Morgan County, AL

The radar

The Northeast Alabama radar (KHTX), 60 km from the middle of the area, began a volume at 18:10 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
Jun 28, 10:46 AM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Birmingham, AL (KBMX), launched 12:00Z, 6.1 hours before the alert went out and 145 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 2018-06-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1996 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 2018-06-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 0 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
1996 J/kg
Mixed-layer CIN
-52 J/kg
Mixed-layer LCL
830 m above ground
0-6 km bulk shear
17 kt
0-1 km storm-relative helicity
0 m²/s²
0-3 km storm-relative helicity
72 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

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 Jun 28, 12:54 PM CDT, 11 minutes earlier.

Area forecast discussion, Jun 28, 12:54 PM CDT, 11 minutes before
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Hazardous weather outlook, Jun 28, 8:44 AM CDT, 4 hours 21 minutes before
Hazardous Weather Outlook...UPDATED
National Weather Service Huntsville AL
844 AM CDT Thu Jun 28 2018

ALZ001>010-016-TNZ076-096-097-290445-
Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan-
Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN-
844 AM CDT Thu Jun 28 2018

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

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

Thunderstorm coverage and intensity will increase this afternoon as
a complex of storms pushes southward from middle Tennessee. Damaging
wind gusts will be the highest threat. Storms will end from
northwest to southeast this evening.

Prior to the onset of precipitation, locations in northwest Alabama
may see heat index values briefly reach the 105 to 107 degree range.
A Heat Advisory has now been issued for Lauderdale, Colbert,
Franklin and Lawrence counties through this evening.

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

Scattered thunderstorms will be possible each day, with perhaps a
slightly higher coverage on Sunday and Monday as a weak upper level
disturbance moves westward across the outlook area.

Dangerous heat index values in the 105 to 110 degree range will be
possible across much of northwest and north central Alabama
tomorrow,
with these values confined to only portions of northwest Alabama on
Saturday and Sunday.

.SPOTTER CALL TO ACTION STATEMENT...

Formal activation of storm spotters and emergency management
personnel is not anticipated at this time. However...timely reports
of strong winds and hail will be greatly appreciated.

In the hours before

Local storm report, Jun 28, 12:34 PM CDT, 31 minutes before
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Local storm report, Jun 28, 12:39 PM CDT, 26 minutes before
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Local storm report, Jun 28, 12:40 PM CDT, 25 minutes before
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Local storm report, Jun 28, 12:48 PM CDT, 17 minutes before
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Local storm report, Jun 28, 12:56 PM CDT, 9 minutes before
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Local storm report, Jun 28, 1:04 PM CDT, 1 minute before
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The office that day

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

IssuedProductOfficeCountiesLasted
Jun 28, 8:43 AM CDTHeat AdvisoryHUNColbert, Franklin, Lauderdale, Lawrence10 hr
Jun 28, 11:33 AM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson57 min
Jun 28, 11:47 AM CDTSevere Thunderstorm WarningHUNJackson, Madison, Marshall58 min
Jun 28, 12:19 PM CDTSevere Thunderstorm WarningHUNLimestone, Madison56 min
Jun 28, 12:25 PM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson50 min
Jun 28, 12:35 PM CDTSevere Thunderstorm WarningHUNDeKalb, Jackson, Madison, Marshall, Morgan40 min
Jun 28, 12:40 PM CDTSevere Thunderstorm WarningHUNJackson, Madison35 min
Jun 28, 12:51 PM CDTFlash Flood WatchHUNCullman, DeKalb, Jackson, Limestone, Madison, Marshall and 1 more4 hr
Jun 28, 1:05 PM CDTSevere Thunderstorm WarningHUNJackson, Limestone, Madison55 min
Jun 28, 1:13 PM CDTSevere Thunderstorm WarningHUNCullman62 min
Jun 28, 1:22 PM CDTSevere Thunderstorm WarningHUNMadison38 min
Jun 28, 1:31 PM CDTSevere Thunderstorm WarningHUNLauderdale, Limestone, Madison29 min
Jun 28, 1:51 PM CDTSevere Thunderstorm WarningHUNJackson, Lauderdale, Lawrence, Limestone, Madison, Morgan34 min
Jun 28, 2:12 PM CDTSevere Thunderstorm WarningHUNCullman, Lawrence, Madison, Marshall, Morgan33 min
Jun 28, 2:24 PM CDTSevere Thunderstorm WarningHUNLauderdale, Lawrence, Limestone, Madison, Morgan51 min
Jun 28, 2:42 PM CDTSevere Thunderstorm WarningHUNColbert, Lauderdale, Lawrence23 min
Jun 28, 2:44 PM CDTSevere Thunderstorm WarningHUNCullman, Lawrence, Morgan31 min
Jun 28, 3:03 PM CDTSevere Thunderstorm WarningHUNColbert, Franklin, Lawrence, Limestone, Morgan42 min
Jun 28, 3:42 PM CDTSpecial Weather StatementHUNMorgan48 min
Jun 28, 4:34 PM CDTSpecial Weather StatementHUNCullman41 min
Jun 28, 4:37 PM CDTSpecial Weather StatementHUNLawrence53 min
Jun 28, 11:02 AM CDTSevere Thunderstorm WarningHUNFranklin, Lincoln, Moore58 min
Jun 28, 11:55 AM CDTSevere Thunderstorm WarningHUNFranklin, Lincoln, Moore50 min
Jun 28, 2:23 PM CDTSevere Thunderstorm WarningHUNFranklin, Lincoln, Moore20 min

Nearby

Severe Thunderstorm Warnings in Alabama, 2018Every severe thunderstorm warning in 2018

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.