Alert archive / Alabama / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 46, NWS Huntsville, AL
NWS Huntsville, AL issued this severe thunderstorm warning at May 4, 2021, 9:39 AM CDT for DeKalb County, Jackson County, Alabama. It was in force for 36 min. 3 reports came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- May 4, 2021, 9:39 AM CDT (14:39 UTC)
- Expired
- May 4, 2021, 10:15 AM CDT
- In force
- 36 min
- Issued by
- NWS Huntsville, AL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties DeKalb County, AL, Jackson County, AL
The radar
The Northeast Alabama radar (KHTX), 38 km from the middle of the area, began a volume at 14:39 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| May 4, 9:41 AM CDT | TSTM WND DMG | 7 Se Bridgeport, AL | A TREE WAS KNOCKED DOWN ON CR 318. TIME ESTIMATED BY RADAR. |
| May 4, 9:43 AM CDT | TSTM WND DMG | 9 Se Bridgeport, AL | A TREE WAS UPROOTED DAMAGING A FENCE AND SHED. SOCIAL MEDIA REPORT THROUGH BROADCAST MEDIA. TIME ESTIMATED BY RADAR. |
| May 4, 9:44 AM CDT | TSTM WND DMG | 5 Nnw Ider, AL | SOCIAL MEDIA REPORT OF A TREE KNOCKED DOWN IN FLAT ROCK. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| May 4, 5:13 AM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
| May 4, 9:18 AM CDT | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Peachtre/Fal Fld, GA (KFFC), launched 12:00Z, 2.7 hours before the alert went out and 194 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
- 590 J/kg
- Mixed-layer CIN
- -114 J/kg
- Mixed-layer LCL
- 753 m above ground
- 0-6 km bulk shear
- 39 kt
- 0-1 km storm-relative helicity
- 207 m²/s²
- 0-3 km storm-relative helicity
- 213 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.3
The text
As transmitted.
755
WUUS54 KHUN 041439
SVRHUN
ALC049-071-041515-
/O.NEW.KHUN.SV.W.0046.210504T1439Z-210504T1515Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Huntsville AL
939 AM CDT Tue May 4 2021
The National Weather Service in Huntsville Alabama has issued a
* Severe Thunderstorm Warning for...
Northeastern Jackson County in northeastern Alabama...
Northeastern DeKalb County in northeastern Alabama...
* Until 1015 AM CDT.
* At 939 AM CDT, severe thunderstorms were located along a line
extending from near Bridgeport to 7 miles southeast of Stevenson to
near Henagar, moving northeast at 35 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Bridgeport, Henagar, Ider, Rosalie, Long Island, Russell Cave
National Monument and Higdon.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 400 PM CDT for northeastern
Alabama.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3466 8578 3478 8576 3498 8583 3498 8560
3486 8559 3471 8555
TIME...MOT...LOC 1439Z 241DEG 29KT 3496 8577 3482 8572 3461 8579
HAIL...0.75IN
WIND...60MPH
$$
05/MA1 follow-up statement
958
WWUS54 KHUN 041456
SVSHUN
Severe Weather Statement
National Weather Service Huntsville AL
956 AM CDT Tue May 4 2021
ALC049-071-041515-
/O.CON.KHUN.SV.W.0046.000000T0000Z-210504T1515Z/
Jackson AL-DeKalb AL-
956 AM CDT Tue May 4 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1015 AM CDT
FOR NORTHEASTERN JACKSON AND NORTHEASTERN DEKALB COUNTIES...
At 955 AM CDT, severe thunderstorms were located along a line
extending from near South Pittsburg to 6 miles west of Trenton to
near Henagar, moving northeast at 30 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Bridgeport, Henagar, Ider, Higdon and Long Island.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 400 PM CDT for northeastern
Alabama.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 3466 8578 3482 8570 3498 8570 3498 8560
3486 8559 3471 8555
TIME...MOT...LOC 1455Z 245DEG 24KT 3499 8567 3485 8562 3464 8569
HAIL...<.75IN
WIND...60MPH
$$
05/MAThe office that day
Everything else NWS Huntsville, AL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 4, 7:18 AM CDT | Special Weather Statement | HUN | Colbert | 42 min |
| May 4, 7:45 AM CDT | Special Weather Statement | HUN | Cullman | 60 min |
| May 4, 8:31 AM CDT | Special Weather Statement | HUN | Limestone, Madison, Morgan | 44 min |
| May 4, 9:01 AM CDT | Special Weather Statement | HUN | Jackson | 44 min |
| May 4, 9:04 AM CDT | Severe Thunderstorm Warning | HUN | Jackson | 26 min |
| May 4, 9:23 AM CDT | Special Weather Statement | HUN | DeKalb | 52 min |
| May 4, 9:25 AM CDT | Special Weather Statement | HUN | Cullman, Morgan | 50 min |
| May 4, 9:31 AM CDT | Severe Thunderstorm Warning | HUN | Cullman, Morgan | 39 min |
| May 4, 9:51 AM CDT | Severe Thunderstorm Warning | HUN | DeKalb | 24 min |
| May 4, 10:17 AM CDT | Special Weather Statement | HUN | DeKalb | 58 min |
| May 4, 10:47 AM CDT | Flash Flood Warning | HUN | DeKalb, Marshall | 3 hr |
| May 4, 10:51 AM CDT | Special Weather Statement | HUN | Marshall | 39 min |
| May 4, 11:15 AM CDT | Special Weather Statement | HUN | Cullman | 45 min |
| May 4, 11:18 AM CDT | Severe Thunderstorm Warning | HUN | Cullman | 42 min |
| May 4, 3:37 PM CDT | Special Weather Statement | HUN | Franklin | 23 min |
| May 4, 4:18 PM CDT | Special Weather Statement | HUN | Lauderdale | 27 min |
| May 4, 5:10 PM CDT | Special Weather Statement | HUN | Cullman | 35 min |
| May 4, 5:56 PM CDT | Special Weather Statement | HUN | Madison | 49 min |
| May 4, 6:01 PM CDT | Special Weather Statement | HUN | Marshall | 44 min |
| May 4, 6:16 PM CDT | Special Weather Statement | HUN | Madison | 44 min |
Nearby
Severe Thunderstorm Warnings in Alabama, 2021Every severe thunderstorm 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.