Alert archive / Florida / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 150, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 22, 2021, 4:45 PM EDT for Duval County, Florida. It was in force for 20 min. 1 report 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
- Aug 22, 2021, 4:45 PM EDT (20:45 UTC)
- Expired
- Aug 22, 2021, 5:05 PM EDT
- In force
- 20 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
County Duval County, FL
The radar
The Jacksonville radar (KJAX), 25 km from the middle of the area, began a volume at 20:45 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 |
|---|---|---|---|
| Aug 22, 4:53 PM EDT | TSTM WND GST 60 | 2 N Mayport, FL | MESONET STATION XHUP HUGUENOT PARK. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Jacksonville, FL (KJAX), launched 12:00Z, 8.8 hours before the alert went out and 26 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
- 772 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 840 m above ground
- 0-6 km bulk shear
- 12 kt
- 0-1 km storm-relative helicity
- 17 m²/s²
- 0-3 km storm-relative helicity
- 61 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
570
WUUS52 KJAX 222045
SVRJAX
FLC031-222115-
/O.NEW.KJAX.SV.W.0150.210822T2045Z-210822T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Jacksonville FL
445 PM EDT Sun Aug 22 2021
The National Weather Service in Jacksonville has issued a
* Severe Thunderstorm Warning for...
Eastern Duval County in northeastern Florida...
* Until 515 PM EDT.
* At 444 PM EDT, a severe thunderstorm was located over Fort
Caroline, or 7 miles northeast of Arlington, moving east at 20 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Unf, Neptune Beach, Craig Field, San Pablo, Little Talbot Island
and Fort Caroline.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Large hail and damaging winds and continuous cloud to ground
lightning is occurring with this storm. Move indoors immediately.
Lightning is one of nature's leading killers. Remember, if you can
hear thunder, you are close enough to be struck by lightning.
Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3021 8137 3025 8138 3025 8144 3022 8144
3022 8143 3023 8142 3021 8141 3019 8152
3054 8164 3056 8159 3052 8154 3058 8150
3054 8147 3058 8149 3057 8148 3059 8147
3052 8144 3060 8144 3061 8140 3022 8134
TIME...MOT...LOC 2044Z 264DEG 18KT 3039 8150
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
HESS1 follow-up statement
174
WWUS52 KJAX 222105
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
505 PM EDT Sun Aug 22 2021
FLC031-222114-
/O.CAN.KJAX.SV.W.0150.000000T0000Z-210822T2115Z/
Duval FL-
505 PM EDT Sun Aug 22 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN DUVAL COUNTY IS
CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled. However gusty winds and
heavy rain are still possible with this thunderstorm.
LAT...LON 3021 8137 3025 8138 3025 8144 3022 8144
3022 8143 3023 8142 3021 8141 3019 8152
3054 8164 3056 8159 3052 8154 3058 8150
3054 8147 3058 8149 3057 8148 3059 8147
3052 8144 3060 8144 3061 8140 3022 8134
TIME...MOT...LOC 2100Z 264DEG 18KT 3040 8138
$$
HESSThe office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 22, 1:14 PM EDT | Special Weather Statement | JAX | Suwannee | 46 min |
| Aug 22, 1:32 PM EDT | Special Weather Statement | JAX | Baker | 43 min |
| Aug 22, 1:46 PM EDT | Special Weather Statement | JAX | Columbia, Suwannee | 44 min |
| Aug 22, 2:22 PM EDT | Special Weather Statement | JAX | Hamilton | 53 min |
| Aug 22, 2:28 PM EDT | Special Weather Statement | JAX | Baker, Columbia, Gilchrist, Union | 47 min |
| Aug 22, 3:09 PM EDT | Special Weather Statement | JAX | Bradford, Clay, Union | 51 min |
| Aug 22, 3:47 PM EDT | Special Weather Statement | JAX | Flagler | 28 min |
| Aug 22, 3:51 PM EDT | Special Weather Statement | JAX | Clay, Duval, Saint Johns | 39 min |
| Aug 22, 4:11 PM EDT | Special Marine Warning | JAX | 94 min | |
| Aug 22, 4:16 PM EDT | Special Weather Statement | JAX | Flagler | 29 min |
| Aug 22, 4:27 PM EDT | Special Weather Statement | JAX | Duval, Saint Johns | 48 min |
| Aug 22, 4:34 PM EDT | Special Weather Statement | JAX | Putnam | 26 min |
| Aug 22, 4:38 PM EDT | Special Weather Statement | JAX | Flagler | 37 min |
| Aug 22, 5:34 PM EDT | Special Marine Warning | JAX | 86 min |
Nearby
Severe Thunderstorm Warnings in Florida, 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.