Alert archive / Alabama / Areal Flood Warnings in 2021
Areal Flood Warning 36, NWS Huntsville, AL
NWS Huntsville, AL issued this areal flood warning at Aug 15, 2021, 6:25 PM CDT for Jackson County, Madison County, Alabama. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Aug 15, 2021, 6:25 PM CDT (23:25 UTC)
- Expired
- Aug 15, 2021, 9:30 PM CDT
- In force
- 3 hr
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Flood severity
- None
Counties Jackson County, AL, Madison County, AL
The radar
The Northeast Alabama radar (KHTX), 25 km from the middle of the area, began a volume at 23:28 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, 11.4 hours before the alert went out and 154 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.
- Mixed-layer CAPE
- 152 J/kg
- Mixed-layer CIN
- -98 J/kg
- Mixed-layer LCL
- 697 m above ground
- 0-6 km bulk shear
- 9 kt
- 0-1 km storm-relative helicity
- 23 m²/s²
- 0-3 km storm-relative helicity
- 36 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this areal flood 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 areal flood warning went out at Aug 15, 3:55 PM CDT, 2 hours 30 minutes earlier.
Area forecast discussion, Aug 15, 3:55 PM CDT, 2 hours 30 minutes before
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</html>Hazardous weather outlook, Aug 15, 4:26 PM CDT, 1 hour 59 minutes before
Hazardous Weather Outlook...UPDATED National Weather Service Huntsville AL 426 PM CDT Sun Aug 15 2021 ALZ001>010-016-TNZ076-096-097-161130- Lauderdale-Colbert-Franklin AL-Lawrence-Limestone-Madison-Morgan- Marshall-Jackson-DeKalb-Cullman-Moore-Lincoln-Franklin TN- 426 PM CDT Sun Aug 15 2021 This Hazardous Weather Outlook is for north Alabama and portions of southern middle Tennessee. .DAY ONE...Remainder of today and tonight... Scattered to numerous thunderstorms will continue to impact the Tennessee Valley late this afternoon and this evening, before decreasing in coverage early Monday morning. Frequent cloud to ground lightning and brief wind gusts of 40-50 MPH will accompany the strongest storms. However, the greatest threat with this activity will be locally heavy rainfall and flooding. .DAYS TWO THROUGH SEVEN...Monday through Saturday... Scattered to numerous thunderstorms will be possible once again late Monday morning, before decreasing in coverage during the afternoon hours. The remnants of Tropical Storm Fred will lift northward across the state of Alabama on Monday night and Tuesday, bringing a fair coverage of light-moderate showers and perhaps a few thunderstorms to the outlook area during this period. Portions of northeast Alabama may experience between 1 and 3 inches of additional rainfall, which could lead to flooding concerns once again. An active weather pattern will persist for the rest of the week, with scattered to numerous thunderstorms expected each afternoon from Wednesday through Saturday. .SPOTTER CALL TO ACTION STATEMENT... Activation of storm spotters and emergency management personnel is not anticipated at this time. 70/DD
In the hours before
Special weather statement, Aug 15, 4:05 PM CDT, 2 hours 20 minutes before
Special Weather Statement
National Weather Service Huntsville AL
405 PM CDT Sun Aug 15 2021
ALZ016-152145-
Cullman AL-
405 PM CDT Sun Aug 15 2021
...A strong thunderstorm will impact portions of southwestern Cullman
County through 445 PM CDT...
At 404 PM CDT, Doppler radar was tracking a strong thunderstorm near
Arkadelphia, or near Sumiton, moving north at 15 mph.
HAZARD...Winds in excess of 30 mph and pea 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...
Hanceville, Good Hope, Dodge City, Colony, Wilburn, Logan, Bremen,
Arkadelphia, Black Bottom and Smith Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
If outdoors, consider seeking shelter inside a building.
Torrential rainfall is also occurring with this storm and may lead to
localized flooding. 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.
&&
LAT...LON 3389 8701 3390 8710 3391 8708 3393 8710
3415 8704 3407 8674 3395 8680 3395 8685
3393 8686 3394 8688 3392 8689 3391 8692
3387 8692 3386 8696 3386 8699
TIME...MOT...LOC 2104Z 198DEG 15KT 3384 8700
MAX HAIL SIZE...0.25 IN
MAX WIND GUST...30 MPH
MAThe office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 15, 1:59 PM CDT | Areal Flood Warning | HUN | Colbert, Lauderdale | 3 hr |
| Aug 15, 3:22 PM CDT | Areal Flood Warning | HUN | Lauderdale | 3 hr |
| Aug 15, 4:05 PM CDT | Special Weather Statement | HUN | Cullman | 40 min |
| Aug 15, 5:56 PM CDT | Areal Flood Warning | HUN | Cullman, Limestone, Madison, Morgan | 3 hr |
| Aug 15, 5:54 PM CDT | Areal Flood Warning | HUN | Franklin, Lincoln, Moore | 3 hr |
Nearby
Areal Flood Warnings in Alabama, 2021Every areal flood warning 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.