Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Jacksonville, FL

October 28, 20214 counties in Florida

NWS Jacksonville, FL issued this special weather statement at Oct 28, 2021, 10:07 AM EDT for 4 counties in Florida. It was in force for 68 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: Oct 28, 2021, 10:07 AM EDT (14:07 UTC)
Expired: Oct 28, 2021, 11:15 AM EDT
In force: 68 min
Issued by: NWS Jacksonville, FL
Hail: 0.00 in
Wind: 40

Counties Columbia County, FL, Gilchrist County, FL, Hamilton County, FL, Suwannee County, FL

The radar

The Moody AFB radar (KVAX), 93 km from the middle of the area, began a volume at 14:07 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

Tampa Bay, FL (KTBW), launched 12:00Z, 2.1 hours before the alert went out and 267 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: 1406 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 675 m above ground
0-6 km bulk shear: 35 kt
0-1 km storm-relative helicity: 211 m²/s²
0-3 km storm-relative helicity: 236 m²/s²
Significant tornado parameter: 1.5
Supercell composite: 10.9

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Oct 28, 7:25 AM EDT, 2 hours 42 minutes earlier.

Area forecast discussion, Oct 28, 7:25 AM EDT, 2 hours 42 minutes before

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        The site you requested is temporarily down for maintenance or an unexpected outage.
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In the hours before

Special weather statement, Oct 28, 9:49 AM EDT, 18 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
949 AM EDT Thu Oct 28 2021

FLZ031-136-232-281415-
Eastern Alachua FL-Western Clay FL-Bradford FL-
949 AM EDT Thu Oct 28 2021

...A strong thunderstorm will impact portions of Bradford,
northeastern Alachua and Clay Counties through 1015 AM EDT...

At 949 AM EDT, Doppler radar was tracking a strong thunderstorm near
Keystone Heights, moving northeast at 25 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Starke, Keystone Heights, Middleburg, Oakleaf Plantation, Lake
Geneva, Camp Blanding, Orange Heights, Kingsley, Sampson and Waldo.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 2965 8219 2981 8233 3014 8213 3014 8205
      3018 8205 3017 8182 2994 8173
TIME...MOT...LOC 1349Z 224DEG 23KT 2982 8215

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

HESS

Special weather statement, Oct 28, 10:02 AM EDT, 5 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
1002 AM EDT Thu Oct 28 2021

FLZ023-024-031-125-132-225-232-325-425-281430-
Eastern Clay FL-Baker FL-Western Clay FL-Western Duval FL-
South Central Duval FL-Inland Nassau FL-Trout River FL-Bradford FL-
Coastal Duval FL-
1002 AM EDT Thu Oct 28 2021

...A strong thunderstorm will impact portions of southwestern Nassau,
northeastern Bradford, southeastern Baker, northwestern Clay and
western Duval Counties through 1030 AM EDT...

At 1002 AM EDT, Doppler radar was tracking a strong thunderstorm near
Middleburg, moving northeast at 35 mph.

HAZARD...Winds in excess of 40 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects.

Locations impacted include...
Jacksonville, Orange Park, Jacksonville International Arpt,
Middleburg, Arlington, Maxville, Cisco Gardens, Ortega, Oakleaf
Plantation and Bellair-Meadowbrook Terrace.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 2997 8188 3007 8212 3046 8198 3051 8171
      3032 8157
TIME...MOT...LOC 1402Z 214DEG 29KT 3008 8199

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

HESS

Special weather statement, Oct 28, 10:07 AM EDT, 0 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
1007 AM EDT Thu Oct 28 2021

FLZ020-021-030-035-122-222-281515-
Southern Columbia FL-Union FL-Hamilton FL-Suwannee FL-
Northern Columbia FL-Gilchrist FL-
1007 AM EDT Thu Oct 28 2021

...Strong thunderstorms will impact portions of central Gilchrist,
northwestern Union, Columbia, Suwannee and Hamilton Counties through
1115 AM EDT...

At 1007 AM EDT, Doppler radar was tracking strong thunderstorms along
a line extending from near Dowling Park to 7 miles northwest of Bell.
Movement was northeast at 20 mph.

HAZARD...Winds in excess of 40 mph and minor flooding due to heavy
         rainfall.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around
         unsecured objects. Minor flooding due to heavy rainfall is
         possible.

Locations impacted include...
Lake City, Live Oak, Jasper, White Springs, Bell, Ichetucknee Spring,
Suwannee River State Park, Suwannee Springs, Columbia and Fort White.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

Conditions are favorable for the development of weak, brief funnel
clouds. This type of funnel cloud is harmless, but on rare occasions
they can briefly touch down, producing wind gusts over 50 mph. If a
funnel cloud is spotted move indoors and report your sighting to the
National Weather Service.

Torrential rainfall is also occurring with these storms and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

&&

LAT...LON 3039 8317 3042 8319 3042 8320 3061 8309
      3056 8252 3008 8246 2959 8291 2958 8295
      2962 8297 2975 8294 2976 8295 2981 8293
      2983 8289 2988 8287 2989 8292 2996 8293
      3008 8307 3012 8323 3026 8325
TIME...MOT...LOC 1407Z 223DEG 17KT 3017 8324 2982 8297

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...40 MPH

HESS

The office that day

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

Issued	Product	Office	Counties	Lasted
Oct 28, 9:49 AM EDT	Special Weather Statement	JAX	Bradford, Clay	26 min
Oct 28, 10:02 AM EDT	Special Weather Statement	JAX	Duval	28 min
Oct 28, 11:03 AM EDT	Special Weather Statement	JAX	Alachua, Bradford, Gilchrist	57 min
Oct 28, 11:57 AM EDT	Special Weather Statement	JAX	Marion, Putnam, Saint Johns	63 min
Oct 28, 12:06 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion, Putnam	39 min
Oct 28, 12:10 PM EDT	Severe Thunderstorm Warning	JAX	Marion	50 min
Oct 28, 12:33 PM EDT	Severe Thunderstorm Warning	JAX	Clay, Flagler, Putnam, Saint Johns	57 min
Oct 28, 12:36 PM EDT	Special Marine Warning	JAX		84 min
Oct 28, 12:45 PM EDT	Severe Thunderstorm Warning	JAX	Marion	45 min
Oct 28, 1:25 PM EDT	Severe Thunderstorm Warning	JAX	Flagler, Marion, Putnam, Saint Johns	65 min
Oct 28, 1:55 PM EDT	Special Marine Warning	JAX		95 min
Oct 28, 2:29 PM EDT	Special Weather Statement	JAX	Flagler	31 min
Oct 28, 3:37 PM EDT	Special Marine Warning	JAX		83 min

Nearby

Special Weather Statements in Florida, 2021 Every special weather statement in 2021

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.