Alert archive / Florida / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 252, NWS Jacksonville, FL
NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 21, 2009, 4:11 PM EDT for Marion County, Florida. It was in force for 49 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 21, 2009, 4:11 PM EDT (20:11 UTC)
- Expired
- Aug 21, 2009, 5:00 PM EDT
- In force
- 49 min
- Issued by
- NWS Jacksonville, FL
- Area
- Storm-based polygon
County Marion County, FL
The radar
The Jacksonville radar (KJAX), 158 km from the middle of the area, began a volume at 20:13 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
Cape Canaveral, FL (KXMR), launched 12:00Z, 8.2 hours before the alert went out and 156 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
- 1482 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 902 m above ground
- 0-6 km bulk shear
- 6 kt
- 0-1 km storm-relative helicity
- 28 m²/s²
- 0-3 km storm-relative helicity
- 30 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS52 KJAX 212011 SVRJAX FLC083-212100- /O.NEW.KJAX.SV.W.0252.090821T2011Z-090821T2100Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE JACKSONVILLE FL 411 PM EDT FRI AUG 21 2009 THE NATIONAL WEATHER SERVICE IN JACKSONVILLE HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... SOUTHERN MARION COUNTY IN NORTHERN FLORIDA * UNTIL 500 PM EDT * AT 412 PM EDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING PENNY SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 6 MILES SOUTH OF WEIRSDALE...OR NEAR LADY LAKE...AND MOVING NORTH AT 20 MPH. * OTHER LOCATIONS IN THE WARNING INCLUDE BUT ARE NOT LIMITED TO WEIRSDALE...LAKE WEIR...OCKLAWAHA...MOSS BLUFF AND SILVER SPRINGS SHORES. PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO LARGE HAIL AND DAMAGING WINDS...CONTINUOUS CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY LIGHTNING IS ONE OF NATURES NUMBER ONE KILLERS. REMEMBER...IF YOU CAN HEAR THUNDER...YOU ARE CLOSE ENOUGH TO BE STRUCK BY LIGHTNING. REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT. && LAT...LON 2918 8203 2915 8177 2895 8182 2895 8205 TIME...MOT...LOC 2012Z 189DEG 18KT 2891 8194 $$ HESS
1 follow-up statement
000 WWUS52 KJAX 212055 SVSJAX SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE JACKSONVILLE FL 455 PM EDT FRI AUG 21 2009 FLC083-212105- /O.EXP.KJAX.SV.W.0252.000000T0000Z-090821T2100Z/ MARION FL- 455 PM EDT FRI AUG 21 2009 ...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN MARION COUNTY WILL EXPIRE AT 500 PM EDT... ALTHOUGH THE WARNING IS NO LONGER IN EFFECT...HAIL UP TO ONE HALF INCH IN DIAMETER...EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. REPORT SEVERE WEATHER OR DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY EMERGENCY MANAGEMENT. LAT...LON 2918 8203 2915 8177 2895 8182 2895 8205 TIME...MOT...LOC 2055Z 189DEG 18KT 2912 8190 $$ HESS
The office that day
Everything else NWS Jacksonville, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 8:05 PM EDT | Special Weather Statement | JAX | Flagler | 25 min |
| Aug 21, 2:48 AM EDT | High Surf Advisory | JAX | Flagler, Nassau | 48 hr |
| Aug 21, 1:47 PM EDT | Special Weather Statement | JAX | Union | 28 min |
| Aug 21, 1:50 PM EDT | Special Weather Statement | JAX | Alachua | 40 min |
| Aug 21, 3:06 PM EDT | Special Weather Statement | JAX | Flagler | 39 min |
| Aug 21, 3:08 PM EDT | Special Weather Statement | JAX | Baker | 52 min |
| Aug 21, 3:35 PM EDT | Special Weather Statement | JAX | Marion | 25 min |
| Aug 21, 3:45 PM EDT | Special Marine Warning | JAX | 2 hr | |
| Aug 21, 3:47 PM EDT | Special Weather Statement | JAX | Nassau | 43 min |
| Aug 21, 3:53 PM EDT | Special Weather Statement | JAX | Putnam | 37 min |
| Aug 21, 3:59 PM EDT | Severe Thunderstorm Warning | JAX | Nassau | 61 min |
| Aug 21, 4:02 PM EDT | Special Weather Statement | JAX | Marion | 43 min |
| Aug 21, 4:05 PM EDT | Special Weather Statement | JAX | Clay | 40 min |
| Aug 21, 4:25 PM EDT | Special Weather Statement | JAX | Duval, Nassau | 50 min |
| Aug 21, 4:27 PM EDT | Special Weather Statement | JAX | Putnam | 48 min |
| Aug 21, 4:32 PM EDT | Severe Thunderstorm Warning | JAX | Clay, Duval, Nassau, Saint Johns | 58 min |
| Aug 21, 4:36 PM EDT | Severe Thunderstorm Warning | JAX | Clay, Flagler, Putnam, Saint Johns | 54 min |
| Aug 21, 4:40 PM EDT | Special Marine Warning | JAX | 2 hr | |
| Aug 21, 4:56 PM EDT | Special Weather Statement | JAX | Marion | 34 min |
| Aug 21, 5:30 PM EDT | Areal Flood Advisory | JAX | Clay, Duval, Putnam, Saint Johns | 2 hr |
| Aug 21, 5:30 PM EDT | Special Weather Statement | JAX | Saint Johns | 45 min |
| Aug 21, 5:37 PM EDT | Special Weather Statement | JAX | Marion | 23 min |
| Aug 21, 5:44 PM EDT | Special Weather Statement | JAX | Putnam | 31 min |
| Aug 21, 6:13 PM EDT | Special Weather Statement | JAX | Putnam, Saint Johns | 32 min |
| Aug 21, 6:34 PM EDT | Special Weather Statement | JAX | Flagler | 26 min |
| Aug 21, 7:17 PM EDT | Special Weather Statement | JAX | Putnam | 28 min |
Nearby
Severe Thunderstorm Warnings in Florida, 2009Every severe thunderstorm warning in 2009
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.