Alert archive / Florida / Severe Thunderstorm Warnings in 2019

Severe Thunderstorm Warning 15, NWS Tampa Bay, FL

April 19, 2019Highlands County, Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at Apr 19, 2019, 4:47 PM EDT for Highlands County, Polk County, Florida. It was in force for 28 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
Apr 19, 2019, 4:47 PM EDT (20:47 UTC)
Expired
Apr 19, 2019, 5:15 PM EDT
In force
28 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon
Hail
0.75 in
Wind
60.0 mph

Counties Highlands County, FL, Polk County, FL

The radar

The Tampa radar (KTBW), 87 km from the middle of the area, began a volume at 20:48 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 19, 1:36 PM EDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 8.8 hours before the alert went out and 87 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-pSkew-T log-p diagram, Tampa Bay, FL at 12:00Z on 2019-04-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1105 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tampa Bay, FL at 12:00Z on 2019-04-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 253 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
1105 J/kg
Mixed-layer CIN
-31 J/kg
Mixed-layer LCL
838 m above ground
0-6 km bulk shear
45 kt
0-1 km storm-relative helicity
253 m²/s²
0-3 km storm-relative helicity
268 m²/s²
Significant tornado parameter
1.6
Supercell composite
10.7

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 Tampa Bay, FL wrote its last area forecast discussion before this severe thunderstorm warning went out at Apr 19, 3:59 PM EDT, 48 minutes earlier.

Area forecast discussion, Apr 19, 3:59 PM EDT, 48 minutes before
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Hazardous weather outlook, Apr 19, 5:39 AM EDT, 11 hours 8 minutes before
Hazardous Weather Outlook
National Weather Service Tampa Bay Ruskin FL
539 AM EDT Fri Apr 19 2019

FLZ043-050-052-056-057-061-139-142-148-149-151-155-160-162-165-
239-242-248-249-251-255-260-262-265-GMZ830-836-850-853-856-870-
873-876-192145-
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-Tampa Bay waters-
Charlotte Harbor and Pine Island Sound-
Coastal waters from Tarpon Springs to Suwannee River FL out 20 NM-
Coastal waters from Englewood to Tarpon Springs FL out 20 NM-
Coastal waters from Bonita Beach to Englewood FL out 20 NM-
Waters from Tarpon Springs to Suwannee River FL out 20 to 60 NM-
Waters from Englewood to Tarpon Springs FL out 20 to 60 NM-
Waters from Bonita Beach to Englewood FL out 20 to 60 NM-
539 AM EDT Fri Apr 19 2019

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

.DAY ONE...Today and Tonight.

...THUNDERSTORM IMPACT...
A cold front approaching from the west will cross over the area
by this evening and will bring a marginal to slight to enhanced
risk of severe thunderstorms. Some of these storms will be capable
of producing damaging winds with hail and a few tornadoes
possible. Locally heavy rains and frequent deadly lightning
strikes can be expected.

...HIGH WIND IMPACT...
Increasing winds will result in hazardous conditions with a wind
advisory along the coast and a lake wind advisory inland. These
strong winds may break small twigs from trees and blow around any
unsecured outdoor objects. High profile vehicles should use extra
caution especially if traveling over bridges or high overpasses.

...COASTAL FLOOD IMPACT...
Strong onshore flow will create elevated waters levels along
coastal locations with flooding possible today...especially at
the times of high tide. A coastal flood warning is now effect
through this evening for Citrus and Levy counties. But all
coastal residents should be alert for later statements or
warnings...and take action to protect property.

...RIP CURRENT IMPACT...
Strong winds on Gulf waters will create high water levels at area
beaches with high surf and a high risk of rip currents possible
into early Sunday.

...MARINE IMPACTS...
Strong southerly winds on the Gulf will increase as they shift to
the northwest...in advance of a cold front moving through the
waters...and continue into Saturday. Wind speeds up to 20 to 25
knots with gusts to gale force will be possible...creating
hazardous boating conditions for small craft operators.

.DAYS TWO THROUGH SEVEN...Saturday through Thursday.

...RIP CURRENT IMPACT...
Strong onshore flow with elevated water levels will continue to
create high surf and a high risk of rip currents along area
beaches through early Sunday.

...MARINE IMPACTS...
Strong winds and high seas will continue into Saturday with
hazardous boating conditions for small craft operators.

.SPOTTER INFORMATION STATEMENT...

Spotters should monitor the weather
and self activate if needed.

09/RKR

In the hours before

Local storm report, Apr 19, 4:00 PM EDT, 47 minutes before
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Local storm report, Apr 19, 4:13 PM EDT, 34 minutes before
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Local storm report, Apr 19, 4:21 PM EDT, 26 minutes before
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Local storm report, Apr 19, 4:25 PM EDT, 22 minutes before
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Local storm report, Apr 19, 4:27 PM EDT, 20 minutes before
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Special weather statement, Apr 19, 4:43 PM EDT, 4 minutes before
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The office that day

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

IssuedProductOfficeCountiesLasted
Apr 19, 3:49 AM EDTWind AdvisoryTBWCharlotte, Citrus, Hernando, Hillsborough, Lee, Levy and 4 more15 hr
Apr 19, 9:23 AM EDTSpecial Marine WarningTBW97 min
Apr 19, 10:25 AM EDTSpecial Weather StatementTBWLevy50 min
Apr 19, 10:36 AM EDTSevere Thunderstorm WarningTBWLevy39 min
Apr 19, 10:54 AM EDTSpecial Marine WarningTBW66 min
Apr 19, 11:04 AM EDTSpecial Marine WarningTBW86 min
Apr 19, 11:19 AM EDTSpecial Weather StatementTBWCharlotte, Lee26 min
Apr 19, 11:22 AM EDTSevere Thunderstorm WarningTBWLevy38 min
Apr 19, 11:34 AM EDTSpecial Weather StatementTBWCitrus26 min
Apr 19, 11:42 AM EDTSevere Thunderstorm WarningTBWCitrus, Levy33 min
Apr 19, 12:12 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando, Pasco, Sumter33 min
Apr 19, 12:17 PM EDTSpecial Marine WarningTBW88 min
Apr 19, 12:31 PM EDTSevere Thunderstorm WarningTBWHernando, Hillsborough, Pasco, Pinellas44 min
Apr 19, 12:32 PM EDTSpecial Marine WarningTBW43 min
Apr 19, 12:50 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando, Sumter40 min
Apr 19, 12:52 PM EDTSpecial Weather StatementTBWLee38 min
Apr 19, 12:54 PM EDTSpecial Weather StatementTBWHighlands, Polk51 min
Apr 19, 1:06 PM EDTSpecial Marine WarningTBW84 min
Apr 19, 1:18 PM EDTSevere Thunderstorm WarningTBWCitrus, Hernando, Hillsborough, Manatee, Pasco, Pinellas and 1 more72 min
Apr 19, 1:44 PM EDTSpecial Weather StatementTBWHighlands16 min
Apr 19, 1:45 PM EDTSpecial Marine WarningTBW90 min
Apr 19, 2:13 PM EDTSevere Thunderstorm WarningTBWHardee, Hillsborough, Manatee, Polk, Sarasota77 min
Apr 19, 3:14 PM EDTSpecial Marine WarningTBW91 min
Apr 19, 3:29 PM EDTSevere Thunderstorm WarningTBWCharlotte, DeSoto, Hardee, Highlands, Manatee, Polk and 1 more61 min
Apr 19, 4:29 PM EDTRiver Flood WarningTBWHillsborough4 hr
Apr 19, 4:43 PM EDTSpecial Weather StatementTBWHighlands, Lee77 min

Nearby

Severe Thunderstorm Warnings in Florida, 2019Every severe thunderstorm warning in 2019

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.