Alert archive / Florida / Severe Thunderstorm Warnings in 2015

Severe Thunderstorm Warning 309, NWS Jacksonville, FL

August 27, 2015Suwannee County, Florida

NWS Jacksonville, FL issued this severe thunderstorm warning at Aug 27, 2015, 5:15 PM EDT for Suwannee 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 counties it named.

The facts

Issued: Aug 27, 2015, 5:15 PM EDT (21:15 UTC)
Expired: Aug 27, 2015, 5:45 PM EDT
In force: 30 min
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon

County Suwannee County, FL

The radar

The Moody AFB radar (KVAX), 77 km from the middle of the area, began a volume at 21:17 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

Tallahassee Rgnl, FL (KTLH), launched 12:00Z, 9.3 hours before the alert went out and 128 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 2200 m above ground
0-6 km bulk shear: 14 kt
0-1 km storm-relative helicity: 52 m²/s²
0-3 km storm-relative helicity: 46 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

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 Aug 27, 3:34 PM EDT, 1 hour 41 minutes earlier.

Area forecast discussion, Aug 27, 3:34 PM EDT, 1 hour 41 minutes before

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Hazardous weather outlook, Aug 27, 4:05 AM EDT, 13 hours 10 minutes before

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In the hours before

Special weather statement, Aug 27, 3:46 PM EDT, 1 hour 29 minutes before

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Special weather statement, Aug 27, 3:54 PM EDT, 1 hour 21 minutes before

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Special weather statement, Aug 27, 5:00 PM EDT, 15 minutes before

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE JACKSONVILLE FL
500 PM EDT THU AUG 27 2015

FLZ021-272145-
SUWANNEE FL-
500 PM EDT THU AUG 27 2015

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SUWANNEE COUNTY
UNTIL 545 PM EDT...

AT 500 PM EDT...DOPPLER RADAR WAS TRACKING A STRONG THUNDERSTORM NEAR
OBRIEN...OR 7 MILES NORTHWEST OF ICHETUCKNEE SPRING. THIS STORM WAS
DRIFTING NORTH.

EXCESSIVE CLOUD-TO-GROUND LIGHTNING AND GUSTY WINDS OF 45 TO 55 MPH
CAN BE EXPECTED ALONG WITH POSSIBLE MINOR DAMAGE.

LOCATIONS IMPACTED INCLUDE...
OBRIEN.

PRECAUTIONARY/PREPAREDNESS ACTIONS...
REPORT DAMAGE TO THE NEAREST LAW ENFORCEMENT AGENCY OR YOUR COUNTY
EMERGENCY MANAGEMENT.

LAT...LON 3013 8279 3001 8279 2997 8280 2996 8289
      3011 8300
TIME...MOT...LOC 2100Z 344DEG 1KT 3003 8287

PETERSON

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 8:00 PM EDT	Special Weather Statement	JAX	Baker	45 min
Aug 26, 8:08 PM EDT	Severe Thunderstorm Warning	JAX	Baker, Bradford, Union	37 min
Aug 26, 8:30 PM EDT	Special Marine Warning	JAX		2 hr
Aug 26, 8:41 PM EDT	Special Weather Statement	JAX	Baker	49 min
Aug 26, 8:53 PM EDT	Areal Flood Advisory	JAX	Alachua, Bradford, Clay	97 min
Aug 26, 10:05 PM EDT	Areal Flood Advisory	JAX	Alachua, Putnam	85 min
Aug 27, 3:46 PM EDT	Special Weather Statement	JAX	Saint Johns	29 min
Aug 27, 3:54 PM EDT	Special Weather Statement	JAX	Gilchrist	36 min
Aug 27, 4:22 PM EDT	Areal Flood Advisory	JAX	Gilchrist	83 min
Aug 27, 5:00 PM EDT	Special Weather Statement	JAX	Suwannee	45 min
Aug 27, 5:48 PM EDT	Special Weather Statement	JAX	Suwannee	42 min
Aug 27, 6:44 PM EDT	Special Weather Statement	JAX	Hamilton	46 min
Aug 27, 6:54 PM EDT	Severe Thunderstorm Warning	JAX	Hamilton	39 min
Aug 27, 7:58 PM EDT	Special Weather Statement	JAX	Bradford	32 min
Aug 27, 5:20 PM EDT	Special Weather Statement	JAX	Wayne	40 min
Aug 27, 6:04 PM EDT	Special Weather Statement	JAX	Pierce	41 min
Aug 27, 6:48 PM EDT	Special Weather Statement	JAX	Pierce	42 min
Aug 27, 7:32 PM EDT	Special Weather Statement	JAX	Echols	43 min
Aug 27, 7:45 PM EDT	Special Weather Statement	JAX	Ware	45 min

Nearby

Severe Thunderstorm Warnings in Florida, 2015 Every severe thunderstorm warning in 2015

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.