Alert archive / Florida / Severe Thunderstorm Warnings in 2017
Severe Thunderstorm Warning 252, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 9, 2017, 3:45 PM EDT for Duval County, Saint Johns County, Florida. It was in force for 30 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
- Aug 9, 2017, 3:45 PM EDT (19:45 UTC)
- Expired
- Aug 9, 2017, 4:15 PM EDT
- In force
- 30 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Duval County, FL, Saint Johns County, FL
The radar
The Jacksonville radar (KJAX), 34 km from the middle of the area, began a volume at 19:48 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
Jacksonville, FL (KJAX), launched 12:00Z, 7.8 hours before the alert went out and 36 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
- 1920 J/kg
- Mixed-layer CIN
- -37 J/kg
- Mixed-layer LCL
- 662 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 7 m²/s²
- 0-3 km storm-relative helicity
- 26 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
649 WUUS52 KJAX 091945 SVRJAX FLC031-109-092015- /O.NEW.KJAX.SV.W.0252.170809T1945Z-170809T2015Z/ BULLETIN - IMMEDIATE BROADCAST REQUESTED Severe Thunderstorm Warning National Weather Service Jacksonville FL 345 PM EDT WED AUG 9 2017 The National Weather Service in Jacksonville has issued a * Severe Thunderstorm Warning for... Northwestern St. Johns County in northeastern Florida... Southeastern Duval County in northeastern Florida... * Until 415 PM EDT * At 345 PM EDT, severe thunderstorms were located along a line extending from near Unf to near Fruit Cove, and are nearly stationary. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. * Locations impacted include... Jacksonville, Mandarin, Unf, Fruit Cove, Baymeadows, Bayard, Durbin, Craig Field, Switzerland and Riverside. PRECAUTIONARY/PREPAREDNESS ACTIONS... For your protection move to an interior room on the lowest floor of a building. Torrential rainfall is occurring with these storms, and may lead to flash flooding. Do not drive your vehicle through flooded roadways. && LAT...LON 3034 8148 3003 8144 3001 8164 3032 8169 TIME...MOT...LOC 1945Z 027DEG 3KT 3029 8155 3005 8155 HAIL...<.75IN WIND...60MPH $$ ENYEDI
2 follow-up statements
824
WWUS52 KJAX 092006
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
406 PM EDT WED AUG 9 2017
FLC109-092015-
/O.CAN.KJAX.SV.W.0252.000000T0000Z-170809T2015Z/
St. Johns FL-
406 PM EDT WED AUG 9 2017
...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ST. JOHNS COUNTY
IS CANCELLED...
The storms which prompted the warning have weakened and moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 3010 8154 3012 8154 3012 8159 3013 8160
3013 8166 3032 8169 3034 8148 3010 8146
TIME...MOT...LOC 2005Z 027DEG 3KT 3028 8156 3004 8156
$$
FLC031-092015-
/O.CON.KJAX.SV.W.0252.000000T0000Z-170809T2015Z/
Duval FL-
406 PM EDT WED AUG 9 2017
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM EDT
FOR SOUTHEASTERN DUVAL COUNTY...
At 405 PM EDT, severe thunderstorms were located along a line
extending from near Baymeadows to near Fruit Cove, and are nearly
stationary.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Jacksonville, Mandarin, Unf, Baymeadows, Bayard, Craig Field,
Riverside, San Marco and Nas Jax.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
Torrential rainfall is occurring with these storms, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.
&&
LAT...LON 3010 8154 3012 8154 3012 8159 3013 8160
3013 8166 3032 8169 3034 8148 3010 8146
TIME...MOT...LOC 2005Z 027DEG 3KT 3028 8156 3004 8156
HAIL...<.75IN
WIND...60MPH
$$
ENYEDI715
WWUS52 KJAX 092015
SVSJAX
Severe Weather Statement
National Weather Service Jacksonville FL
415 PM EDT WED AUG 9 2017
FLC031-092025-
/O.EXP.KJAX.SV.W.0252.000000T0000Z-170809T2015Z/
Duval FL-
415 PM EDT WED AUG 9 2017
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN DUVAL COUNTY HAS
EXPIRED...
The storms which prompted the warning have moved out of the area.
Therefore the warning has been allowed to expire. However small hail
and gusty winds are still possible with these thunderstorms.
Remember, a Severe Thunderstorm Warning still remains in effect for
portions of eastern Duval county.
LAT...LON 3010 8154 3012 8154 3012 8159 3013 8160
3013 8166 3032 8169 3034 8148 3010 8146
TIME...MOT...LOC 2015Z 027DEG 3KT 3027 8156 3003 8156
$$
ENYEDIThe office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 8, 8:09 PM EDT | Special Weather Statement | JAX | Marion | 51 min |
| Aug 8, 8:12 PM EDT | Special Weather Statement | JAX | Putnam | 48 min |
| Aug 8, 8:44 PM EDT | Special Weather Statement | JAX | Putnam | 46 min |
| Aug 8, 8:55 PM EDT | Severe Thunderstorm Warning | JAX | Flagler, Putnam, Saint Johns | 16 min |
| Aug 8, 8:58 PM EDT | Special Marine Warning | JAX | 92 min | |
| Aug 8, 9:05 PM EDT | Special Weather Statement | JAX | Flagler | 40 min |
| Aug 8, 9:18 PM EDT | Areal Flood Advisory | JAX | Flagler, Putnam, Saint Johns | 3 hr |
| Aug 8, 9:39 PM EDT | Special Weather Statement | JAX | Flagler | 51 min |
| Aug 9, 1:45 PM EDT | Special Weather Statement | JAX | Putnam | 30 min |
| Aug 9, 1:49 PM EDT | Areal Flood Advisory | JAX | Putnam | 86 min |
| Aug 9, 2:07 PM EDT | Areal Flood Advisory | JAX | Marion | 83 min |
| Aug 9, 2:13 PM EDT | Special Weather Statement | JAX | Putnam | 32 min |
| Aug 9, 2:15 PM EDT | Special Weather Statement | JAX | Levy | 30 min |
| Aug 9, 2:22 PM EDT | Special Weather Statement | JAX | Clay | 23 min |
| Aug 9, 2:36 PM EDT | Severe Thunderstorm Warning | JAX | Clay | 39 min |
| Aug 9, 2:37 PM EDT | Special Weather Statement | JAX | Levy | 38 min |
| Aug 9, 2:41 PM EDT | Special Weather Statement | JAX | Clay | 34 min |
| Aug 9, 2:43 PM EDT | Areal Flood Advisory | JAX | Clay | 2 hr |
| Aug 9, 2:45 PM EDT | Severe Thunderstorm Warning | JAX | Clay | 30 min |
| Aug 9, 2:57 PM EDT | Severe Thunderstorm Warning | JAX | Clay, Putnam | 19 min |
| Aug 9, 3:00 PM EDT | Special Weather Statement | JAX | Clay | 45 min |
| Aug 9, 3:01 PM EDT | Special Weather Statement | JAX | Nassau | 29 min |
| Aug 9, 3:07 PM EDT | Special Weather Statement | JAX | Citrus | 38 min |
| Aug 9, 3:13 PM EDT | Special Weather Statement | JAX | Duval | 32 min |
| Aug 9, 3:23 PM EDT | Severe Thunderstorm Warning | JAX | Duval | 37 min |
| Aug 9, 3:25 PM EDT | Severe Thunderstorm Warning | JAX | Bradford, Clay | 22 min |
| Aug 9, 3:27 PM EDT | Special Weather Statement | JAX | Saint Johns | 48 min |
| Aug 9, 3:28 PM EDT | Special Weather Statement | JAX | Alachua | 32 min |
| Aug 9, 3:29 PM EDT | Areal Flood Advisory | JAX | Clay | 61 min |
| Aug 9, 3:35 PM EDT | Special Weather Statement | JAX | Clay | 25 min |
| Aug 9, 3:36 PM EDT | Severe Thunderstorm Warning | JAX | Alachua, Bradford, Columbia, Union | 28 min |
| Aug 9, 3:41 PM EDT | Special Weather Statement | JAX | Alachua | 49 min |
| Aug 9, 3:43 PM EDT | Special Weather Statement | JAX | Marion | 32 min |
| Aug 9, 3:46 PM EDT | Special Weather Statement | JAX | Nassau | 29 min |
| Aug 9, 3:49 PM EDT | Severe Thunderstorm Warning | JAX | Alachua | 41 min |
| Aug 9, 4:00 PM EDT | Areal Flood Advisory | JAX | Duval, Saint Johns | 60 min |
| Aug 9, 4:01 PM EDT | Special Weather Statement | JAX | Bradford | 29 min |
| Aug 9, 4:05 PM EDT | Areal Flood Advisory | JAX | Alachua, Bradford, Union | 85 min |
| Aug 9, 4:09 PM EDT | Severe Thunderstorm Warning | JAX | Alachua, Bradford, Union | 36 min |
| Aug 9, 4:12 PM EDT | Severe Thunderstorm Warning | JAX | Duval | 33 min |
| Aug 9, 4:20 PM EDT | Special Weather Statement | JAX | Gilchrist | 25 min |
| Aug 9, 4:24 PM EDT | Areal Flood Advisory | JAX | Duval | 66 min |
| Aug 9, 4:24 PM EDT | Special Weather Statement | JAX | Nassau | 36 min |
| Aug 9, 4:28 PM EDT | Special Weather Statement | JAX | Baker | 32 min |
| Aug 9, 4:30 PM EDT | Special Weather Statement | JAX | Marion | 30 min |
| Aug 9, 4:35 PM EDT | Areal Flood Warning | JAX | Duval | 85 min |
| Aug 9, 4:45 PM EDT | Areal Flood Advisory | JAX | Gilchrist | 60 min |
| Aug 9, 4:48 PM EDT | Special Weather Statement | JAX | Gilchrist | 27 min |
| Aug 9, 4:55 PM EDT | Areal Flood Advisory | JAX | Duval, Nassau | 65 min |
| Aug 9, 4:59 PM EDT | Special Weather Statement | JAX | Duval | 31 min |
| Aug 9, 5:04 PM EDT | Special Weather Statement | JAX | Suwannee | 26 min |
| Aug 9, 5:14 PM EDT | Areal Flood Warning | JAX | Alachua | 91 min |
| Aug 9, 5:15 PM EDT | Special Weather Statement | JAX | Columbia | 45 min |
| Aug 9, 5:22 PM EDT | Special Weather Statement | JAX | Baker | 38 min |
| Aug 9, 5:32 PM EDT | Special Weather Statement | JAX | Suwannee | 28 min |
| Aug 9, 5:37 PM EDT | Special Weather Statement | JAX | Nassau | 38 min |
| Aug 9, 6:09 PM EDT | Special Weather Statement | JAX | Suwannee | 36 min |
| Aug 9, 6:53 PM EDT | Special Weather Statement | JAX | Suwannee | 37 min |
| Aug 9, 7:34 PM EDT | Special Weather Statement | JAX | Hamilton | 26 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2017Every severe thunderstorm warning in 2017
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.