Alert archive / Florida / Special Weather Statements in 2011

Special Weather Statement, NWS Jacksonville, FL

July 29, 2011Nassau County, Florida

NWS Jacksonville, FL issued this special weather statement at Jul 29, 2011, 4:13 PM EDT for Nassau County, Florida. It was in force for 62 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: Jul 29, 2011, 4:13 PM EDT (20:13 UTC)
Expired: Jul 29, 2011, 5:15 PM EDT
In force: 62 min
Issued by: NWS Jacksonville, FL

County Nassau County, FL

The radar

The Jacksonville radar (KJAX), 16 km from the middle of the area, began a volume at 20:16 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, 8.2 hours before the alert went out and 16 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: 152 J/kg
Mixed-layer CIN: -59 J/kg
Mixed-layer LCL: 910 m above ground
0-6 km bulk shear: 7 kt
0-1 km storm-relative helicity: -4 m²/s²
0-3 km storm-relative helicity: -2 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

007 
WWUS82 KJAX 292013
SPSJAX

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
413 PM EDT FRI JUL 29 2011

FLZ024-025-292115-
DUVAL-NASSAU-
413 PM EDT FRI JUL 29 2011

...A SIGNIFICANT WEATHER ADVISORY HAS BEEN ISSUED FOR NORTHERN DUVAL
AND NASSAU COUNTIES FOR STRONG WINDS AND EXCESSIVE LIGHTNING VALID
UNTIL 515 PM EDT...

AT 413 PM EDT NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED STRONG
THUNDERSTORMS CENTERED ALONG A LINE EXTENDING FROM 5 MILES WEST OF
RATLIFF TO JACKSONVILLE INTERNATIONAL AIRPORT TO AMELIA CITY...MOVING
SOUTH AT 10 MPH. THESE STRONG THUNDERSTORMS WILL ALSO AFFECT AREAS
AROUND YULEE...RATLIFF...FERNANDINA BEACH...CALLAHAN...AMELIA CITY...
JACKSONVILLE INTERNATIONAL AIRPORT...OCEANWAY...TALBOT ISLAND...
BRYCEVILLE AND LITTLE TALBOT ISLAND THROUGH 515 PM EDT. EXCESSIVE
CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH CAN BE
EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE. HEAVY RAINFALL WILL
PRODUCE PONDING OF WATER ON ROADWAYS AND MINOR FLOODING OF LOW-LYING
AREAS.

REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

LAT...LON 3037 8139 3029 8200 3061 8200 3072 8171
      3067 8142 3052 8143 3051 8144 3050 8142
      3048 8140 3043 8140 3039 8138
TIME...MOT...LOC 2013Z 350DEG 10KT 3050 8189 3048 8171
          3056 8146

$$

ENYEDI

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 29, 4:24 PM EDT	Areal Flood Advisory	JAX	Nassau	96 min
Jul 29, 4:58 PM EDT	Areal Flood Advisory	JAX	Duval, Nassau	62 min
Jul 29, 7:30 PM EDT	Special Weather Statement	JAX	Suwannee	30 min
Jul 29, 7:53 PM EDT	Areal Flood Advisory	JAX	Suwannee	52 min
Jul 28, 9:19 PM EDT	Areal Flood Advisory	JAX	Appling, Bacon, Pierce, Wayne	56 min

Nearby

Special Weather Statements in Florida, 2011 Every special weather statement in 2011

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.