Alert archive / Florida / Special Weather Statements in 2021

Special Weather Statement, NWS Tampa Bay, FL

April 18, 2021Polk County, Florida

NWS Tampa Bay, FL issued this special weather statement at Apr 18, 2021, 10:53 PM EDT for Polk County, Florida. It was in force for 22 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: Apr 18, 2021, 10:53 PM EDT (02:53 UTC)
Expired: Apr 18, 2021, 11:15 PM EDT
In force: 22 min
Issued by: NWS Tampa Bay, FL

County Polk County, FL

The radar

The Tampa radar (KTBW), 94 km from the middle of the area, began a volume at 02:54 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 00:00Z, 2.9 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: 1430 J/kg
Mixed-layer CIN: -14 J/kg
Mixed-layer LCL: 988 m above ground
0-6 km bulk shear: 42 kt
0-1 km storm-relative helicity: 51 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 2.0

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 Tampa Bay, FL wrote its last area forecast discussion before this special weather statement went out at Apr 18, 7:53 PM EDT, 3 hours earlier.

Area forecast discussion, Apr 18, 7:53 PM EDT, 3 hours before

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Hazardous weather outlook, Apr 18, 3:11 AM EDT, 19 hours 42 minutes before

Hazardous Weather Outlook
National Weather Service Tampa Bay Ruskin FL
311 AM EDT Sun Apr 18 2021

FLZ043-050-052-056-057-061-139-142-148-149-151-155-160-162-165-
239-242-248-249-251-255-260-262-265-182000-
Sumter-Pinellas-Polk-Hardee-Highlands-DeSoto-Coastal Levy-
Coastal Citrus-Coastal Hernando-Coastal Pasco-
Coastal Hillsborough-Coastal Manatee-Coastal Sarasota-
Coastal Charlotte-Coastal Lee-Inland Levy-Inland Citrus-
Inland Hernando-Inland Pasco-Inland Hillsborough-Inland Manatee-
Inland Sarasota-Inland Charlotte-Inland Lee-
311 AM EDT Sun Apr 18 2021

This Hazardous Weather Outlook is for West Central And Southwest
Florida.

.DAY ONE...Today and Tonight.

...THUNDERSTORM IMPACT...
Thunderstorms are expected today. Thunderstorms that develop will
be capable of producing strong gusty winds...locally heavy
rains... and frequent deadly lightning strikes. Some of these
thunderstorms may produce large hail and damaging wind gusts.

...HEAVY RAIN IMPACT...
Locally heavy rainfall is possible. Heavy rain may produce
localized flooding of low lying and poor drainage areas as well
as the ponding of water on roadways. Motorists should exercise
caution.

.DAYS TWO THROUGH SEVEN...Monday through Saturday.

...THUNDERSTORM IMPACT...
Through Wednesday, thunderstorms are expected. Thunderstorms will
be capable of producing strong gusty winds...locally heavy
rains... and frequent deadly lightning strikes. Some of these
storms may produce large hail and damaging winds on Monday.

...HEAVY RAIN IMPACT...
Through Wednesday, locally heavy rainfall is possible. Heavy rain
may produce localized flooding of low lying and poor drainage
areas as well as the ponding of water on roadways. Motorists
should exercise caution.

.SPOTTER INFORMATION STATEMENT...

Spotter activation will not be needed today.

Norman

In the hours before

Special weather statement, Apr 18, 9:55 PM EDT, 58 minutes before

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Local storm report, Apr 18, 9:56 PM EDT, 57 minutes before

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Special weather statement, Apr 18, 10:53 PM EDT, 0 minutes before

Special Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
1053 PM EDT Sun Apr 18 2021

FLZ052-190315-
Polk FL-
1053 PM EDT Sun Apr 18 2021

...SIGNIFICANT WEATHER ADVISORY FOR NORTH CENTRAL POLK COUNTY UNTIL
1115 PM EDT...

At 1052 PM EDT, Doppler radar was tracking a strong thunderstorm near
Four Corners, or 12 miles southwest of Bay Lake, moving east at 35
mph.

Small hail and winds in excess of 40 mph will be possible with this
storm.

This storm will remain over mainly rural areas of north central Polk
County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 2821 8176 2835 8183 2836 8180 2836 8179
      2835 8179 2835 8166 2826 8166 2826 8156
      2825 8155
TIME...MOT...LOC 0252Z 248DEG 30KT 2830 8174

TBW

The office that day

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

Issued	Product	Office	Counties	Lasted
Apr 18, 9:23 PM EDT	Special Marine Warning	TBW		37 min
Apr 18, 9:26 PM EDT	Tornado Warning	TBW	Hillsborough, Pasco, Pinellas	34 min
Apr 18, 9:55 PM EDT	Special Weather Statement	TBW	Pinellas	35 min
Apr 18, 11:16 PM EDT	Special Weather Statement	TBW	Polk	44 min
Apr 19, 3:33 AM EDT	Special Marine Warning	TBW		57 min
Apr 19, 4:14 AM EDT	Special Weather Statement	TBW	Polk	46 min
Apr 19, 4:18 AM EDT	Special Weather Statement	TBW	Manatee	27 min
Apr 19, 4:26 AM EDT	Severe Thunderstorm Warning	TBW	Polk	34 min
Apr 19, 4:57 AM EDT	Special Marine Warning	TBW		63 min
Apr 19, 5:01 AM EDT	Special Weather Statement	TBW	Polk	44 min
Apr 19, 5:42 AM EDT	Special Weather Statement	TBW	Hardee	48 min
Apr 19, 5:48 AM EDT	Severe Thunderstorm Warning	TBW	Polk	42 min
Apr 19, 5:58 AM EDT	Areal Flood Advisory	TBW	Polk	2 hr
Apr 19, 6:06 AM EDT	Special Marine Warning	TBW		39 min
Apr 19, 6:36 AM EDT	Special Weather Statement	TBW	Hardee	39 min
Apr 19, 6:44 AM EDT	Tornado Warning	TBW	Hardee	36 min
Apr 19, 7:19 AM EDT	Special Weather Statement	TBW	Highlands	41 min
Apr 19, 7:57 AM EDT	Areal Flood Advisory	TBW	Hardee, Highlands	2 hr
Apr 19, 8:00 AM EDT	Special Weather Statement	TBW	Highlands	60 min
Apr 19, 10:36 AM EDT	Special Weather Statement	TBW	Charlotte	39 min
Apr 19, 2:22 PM EDT	Rip Current Statement	TBW	Charlotte, Hillsborough, Lee, Manatee, Pinellas, Sarasota	30 hr
Apr 19, 3:00 PM EDT	Special Weather Statement	TBW	Highlands	30 min
Apr 19, 3:33 PM EDT	Severe Thunderstorm Warning	TBW	Highlands	27 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.