Alert archive / Florida / Severe Thunderstorm Warnings in 2009

Severe Thunderstorm Warning 164, NWS Jacksonville, FL

June 22, 2009Nassau County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Jun 22, 2009, 6:50 PM EDT for Nassau County, Florida. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Jun 22, 2009, 6:50 PM EDT (22:50 UTC)
Expired: Jun 22, 2009, 7:30 PM EDT
In force: 40 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 22:51 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, 10.8 hours before the alert went out and 14 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1523 J/kg
Mixed-layer CIN: -87 J/kg
Mixed-layer LCL: 1270 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 108 m²/s²
Significant tornado parameter: 0.2
Supercell composite: 1.9

Open this sounding in Storm Lab

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS Jacksonville, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 22, 4:00 PM EDT, 2 hours 50 minutes earlier.

Area forecast discussion, Jun 22, 4:00 PM EDT, 2 hours 50 minutes before

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Hazardous weather outlook, Jun 22, 3:40 PM EDT, 3 hours 10 minutes before

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In the hours before

Local storm report, Jun 22, 5:53 PM EDT, 57 minutes before

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Special weather statement, Jun 22, 5:56 PM EDT, 54 minutes before

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Special weather statement, Jun 22, 5:57 PM EDT, 53 minutes before

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Local storm report, Jun 22, 6:12 PM EDT, 38 minutes before

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Local storm report, Jun 22, 6:27 PM EDT, 23 minutes before

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Special weather statement, Jun 22, 6:35 PM EDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
635 PM EDT MON JUN 22 2009

GAZ152>154-165-166-222330-
BRANTLEY-COASTAL CAMDEN-COASTAL GLYNN-INLAND CAMDEN-INLAND GLYNN-
635 PM EDT MON JUN 22 2009

...A SIGNIFICANT WEATHER ALERT HAS BEEN ISSUED FOR EASTERN
BRANTLEY...NORTHERN CAMDEN AND GLYNN COUNTIES FOR STRONG WINDS...
SMALL HAIL AND EXCESSIVE LIGHTNING VALID UNTIL 730 PM EDT...

AT 636 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS CENTERED 7 MILES NORTH OF WAYNESVILLE...OR 12 MILES
NORTHEAST OF NAHUNTA...MOVING SOUTH AT 25 MPH. THESE STRONG
THUNDERSTORMS WILL ALSO AFFECT AREAS AROUND THALMANN...ATKINSON...
WAYNESVILLE...DOCK JUNCTION...WAVERLY...TARBORO...WOODBINE...DOVER
BLUFF AND COLESBURG THROUGH 730 PM EDT. 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 DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

A SEVERE THUNDERSTORM WATCH REMAINS IN EFFECT UNTIL 1000 PM EDT
MONDAY EVENING FOR SOUTHEAST GEORGIA.

LAT...LON 3113 8137 3114 8143 3110 8147 3109 8145
      3113 8142 3113 8141 3106 8140 3102 8142
      3100 8144 3103 8145 3099 8147 3096 8145
      3092 8147 3086 8179 3132 8191 3135 8175
      3133 8172 3136 8169 3139 8157 3125 8127
TIME...MOT...LOC 2236Z 344DEG 22KT 3131 8183

ZIBURA

The office that day

Everything else NWS Jacksonville, FL issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Jun 21, 11:31 PM EDT	Special Marine Warning	JAX		89 min
Jun 22, 12:59 AM EDT	Special Marine Warning	JAX		61 min
Jun 22, 1:32 AM EDT	Special Marine Warning	JAX		88 min
Jun 22, 2:16 AM EDT	Special Marine Warning	JAX		89 min
Jun 22, 3:01 AM EDT	Special Marine Warning	JAX		119 min
Jun 22, 6:33 PM EDT	Severe Thunderstorm Warning	JAX	Nassau	55 min
Jun 22, 6:47 PM EDT	Special Marine Warning	JAX		92 min
Jun 22, 7:14 PM EDT	Special Weather Statement	JAX	Duval	31 min
Jun 22, 7:22 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Duval, Nassau, Saint Johns	53 min
Jun 22, 7:26 PM EDT	Severe Thunderstorm Warning	JAX	Duval, Nassau	64 min
Jun 22, 7:33 PM EDT	Special Marine Warning	JAX		87 min
Jun 22, 4:22 PM EDT	Special Weather Statement	JAX	Jeff Davis	53 min
Jun 22, 4:49 PM EDT	Special Weather Statement	JAX	Long	56 min
Jun 22, 4:57 PM EDT	Severe Thunderstorm Warning	JAX	Appling, Bacon, Coffee, Jeff Davis	63 min
Jun 22, 5:19 PM EDT	Severe Thunderstorm Warning	JAX	Wayne	71 min
Jun 22, 5:50 PM EDT	Severe Thunderstorm Warning	JAX	Bacon, Brantley, Coffee, Pierce, Ware	47 min
Jun 22, 5:56 PM EDT	Special Weather Statement	JAX	Ware	64 min
Jun 22, 5:57 PM EDT	Special Weather Statement	JAX	Glynn	48 min
Jun 22, 6:35 PM EDT	Special Weather Statement	JAX	Camden, Glynn	55 min
Jun 22, 6:42 PM EDT	Severe Thunderstorm Warning	JAX	Brantley, Camden, Glynn, Wayne	45 min
Jun 22, 7:16 PM EDT	Special Weather Statement	JAX	Camden	44 min

Nearby

Severe Thunderstorm Warnings in Florida, 2009 Every 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.