Alert archive / Florida / Areal Flood Warnings in 2021

Areal Flood Warning 75, NWS Jacksonville, FL

August 19, 2021Columbia County, Florida

NWS Jacksonville, FL issued this areal flood warning at Aug 19, 2021, 7:31 PM EDT for Columbia County, Florida. It was in force for 3 hr. 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 19, 2021, 7:31 PM EDT (23:31 UTC)
Expired: Aug 19, 2021, 10:45 PM EDT
In force: 3 hr
Issued by: NWS Jacksonville, FL
Area: Storm-based polygon
Flood severity: None

County Columbia County, FL

The nearest sounding before it

Jacksonville, FL (KJAX), launched 12:00Z, 11.5 hours before the alert went out and 94 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: 1604 J/kg
Mixed-layer CIN: -33 J/kg
Mixed-layer LCL: 844 m above ground
0-6 km bulk shear: 3 kt
0-1 km storm-relative helicity: 0 m²/s²
0-3 km storm-relative helicity: 7 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 areal flood 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 areal flood warning went out at Aug 19, 7:23 PM EDT, 8 minutes earlier.

Area forecast discussion, Aug 19, 7:23 PM EDT, 8 minutes before

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In the hours before

Special weather statement, Aug 19, 6:06 PM EDT, 1 hour 25 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
606 PM EDT Thu Aug 19 2021

FLZ023-192245-
Baker FL-
606 PM EDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of southeastern Baker
County through 645 PM EDT...

At 605 PM EDT, Doppler radar was tracking a strong thunderstorm near
Glen St. Mary, or 13 miles north of Raiford, moving southwest at 10
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...
Macclenny, Glen St. Mary and Sanderson.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3035 8226 3036 8205 3030 8205 3014 8214
      3014 8237
TIME...MOT...LOC 2205Z 036DEG 9KT 3026 8221

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

BOOTHE

Special weather statement, Aug 19, 6:25 PM EDT, 1 hour 6 minutes before

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  <meta name="viewport" content="width=device-width, initial-scale=1">
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  <link rel="stylesheet" href="index.css">
</head>
<body>
  <main class="wrap">
    <section class="card" role="status" aria-live="polite">
      <div class="status" id="status">Temporary Notice</div>
      <h1 id="headline">This service is currently unavailable.</h1>
      <p id="message1">
        The site you requested is temporarily down for maintenance or an unexpected outage.
      </p>
      <p id="message2">
        Please try again in a few minutes.
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      <p class="small" id="detail">
        If you are an administrator, restore upstream service and remove the redirect/fallback rule when normal operations resume.
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Special weather statement, Aug 19, 6:30 PM EDT, 1 hour 1 minute before

Special Weather Statement
National Weather Service Jacksonville FL
630 PM EDT Thu Aug 19 2021

FLZ240-340-192315-
Central Marion FL-Western Marion FL-
630 PM EDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of northwestern Marion
County through 715 PM EDT...

At 630 PM EDT, Doppler radar was tracking a strong thunderstorm 7
miles east of Williston, moving southwest at 5 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...
Ocala, Ocala Airport and Flemington.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 2926 8241 2948 8240 2949 8228 2930 8218
      2913 8211 2909 8239
TIME...MOT...LOC 2230Z 024DEG 5KT 2941 8235

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

BOOTHE

Special weather statement, Aug 19, 6:33 PM EDT, 58 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
633 PM EDT Thu Aug 19 2021

FLZ030-136-222-236-192330-
Eastern Alachua FL-Southern Columbia FL-Western Alachua FL-Union FL-
633 PM EDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of northwestern
Alachua, southwestern Union and southern Columbia Counties through
730 PM EDT...

At 633 PM EDT, Doppler radar was tracking a strong thunderstorm near
Providence, or 8 miles east of Ichetucknee Spring, moving northwest
at 5 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, Columbia, Fort White, Upland Pines, Providence, Five
Points and Watertown.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

&&

LAT...LON 2991 8249 2984 8268 2999 8275 3024 8279
      3024 8253
TIME...MOT...LOC 2233Z 145DEG 5KT 3000 8264

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

BOOTHE

Special weather statement, Aug 19, 7:11 PM EDT, 20 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
711 PM EDT Thu Aug 19 2021

GAZ152-153-165-200015-
Inland Glynn GA-Inland Camden GA-Brantley GA-
711 PM EDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of northwestern Camden,
southwestern Glynn and east central Brantley Counties through 815 PM
EDT...

At 711 PM EDT, Doppler radar was tracking a strong thunderstorm over
Waverly, or 11 miles north of Woodbine. This storm was nearly
stationary.

HAZARD...Minor flooding due to heavy rainfall.

SOURCE...Radar indicated.

IMPACT...Minor flooding due to heavy rainfall is possible.

Locations impacted include...
Waverly and Waynesville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 3119 8156 3117 8158 3104 8167 3109 8185
      3120 8187 3128 8177
TIME...MOT...LOC 2311Z 278DEG 1KT 3112 8170

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH

BOOTHE

Special weather statement, Aug 19, 7:15 PM EDT, 16 minutes before

Special Weather Statement
National Weather Service Jacksonville FL
715 PM EDT Thu Aug 19 2021

FLZ035-236-200000-
Western Alachua FL-Gilchrist FL-
715 PM EDT Thu Aug 19 2021

...A strong thunderstorm will impact portions of southeastern
Gilchrist and west central Alachua Counties through 800 PM EDT...

At 715 PM EDT, Doppler radar was tracking a strong thunderstorm 9
miles northwest of Archer, or 12 miles east of Trenton, moving south
at 10 mph.

HAZARD...Minor flooding due to heavy rainfall.

SOURCE...Radar indicated.

IMPACT...Minor flooding due to heavy rainfall is possible.

Locations impacted include...
Newberry.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building.

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

&&

LAT...LON 2970 8266 2971 8254 2954 8256 2953 8265
      2955 8266 2956 8266 2957 8270
TIME...MOT...LOC 2315Z 015DEG 9KT 2964 8261

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...<30 MPH

BOOTHE

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 3:22 AM EDT	Heat Advisory	JAX	Alachua, Baker, Bradford, Clay, Duval, Flagler and 6 more	16 hr
Aug 19, 4:59 PM EDT	Special Weather Statement	JAX	Alachua	46 min
Aug 19, 5:23 PM EDT	Special Weather Statement	JAX	Nassau	22 min
Aug 19, 5:35 PM EDT	Severe Thunderstorm Warning	JAX	Alachua	40 min
Aug 19, 5:54 PM EDT	Special Weather Statement	JAX	Alachua	51 min
Aug 19, 6:03 PM EDT	Severe Thunderstorm Warning	JAX	Alachua, Marion	27 min
Aug 19, 6:06 PM EDT	Special Weather Statement	JAX	Baker	39 min
Aug 19, 6:25 PM EDT	Special Weather Statement	JAX	Duval	50 min
Aug 19, 6:30 PM EDT	Special Weather Statement	JAX	Marion	45 min
Aug 19, 6:33 PM EDT	Special Weather Statement	JAX	Columbia	57 min
Aug 19, 7:00 PM EDT	Areal Flood Warning	JAX	Alachua, Columbia, Union	3 hr
Aug 19, 7:15 PM EDT	Special Weather Statement	JAX	Gilchrist	45 min
Aug 19, 7:20 PM EDT	Areal Flood Warning	JAX	Baker, Duval, Nassau	3 hr
Aug 19, 7:45 PM EDT	Special Weather Statement	JAX	Columbia	60 min
Aug 19, 7:11 PM EDT	Special Weather Statement	JAX	Glynn	64 min

Nearby

Areal Flood Warnings in Florida, 2021 Every areal flood warning 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.