Alert archive / Florida / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS Tampa Bay, FL

May 30, 2021Hillsborough County, Polk County, Florida

NWS Tampa Bay, FL issued this severe thunderstorm warning at May 30, 2021, 4:34 PM EDT for Hillsborough County, Polk County, Florida. It was in force for 26 min. 1 report came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
May 30, 2021, 4:34 PM EDT (20:34 UTC)
Expired
May 30, 2021, 5:00 PM EDT
In force
26 min
Issued by
NWS Tampa Bay, FL
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Hillsborough County, FL, Polk County, FL

The radar

The Tampa radar (KTBW), 31 km from the middle of the area, began a volume at 20:38 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.

What was reported inside it

TimeReportWhereRemark
May 30, 4:45 PM EDTHAIL 1.254 Sse Dover, FLPUBLIC RELAYED VIA SOCIAL MEDIA IMAGE OF QUARTER TO HALF DOLLAR SIZE HAIL. TIME AND LOCATION ESTIMATED BY RADAR.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Tampa Bay, FL (KTBW), launched 12:00Z, 8.6 hours before the alert went out and 31 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 2021-05-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1117 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 2021-05-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 15 square meters per square second.193958Sfc1 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
1117 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
737 m above ground
0-6 km bulk shear
22 kt
0-1 km storm-relative helicity
15 m²/s²
0-3 km storm-relative helicity
24 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.4

Open this sounding in Storm Lab

The text

As transmitted.

674 
WUUS52 KTBW 302034
SVRTBW
FLC057-105-302100-
/O.NEW.KTBW.SV.W.0015.210530T2034Z-210530T2100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Tampa Bay Area Ruskin FL
434 PM EDT Sun May 30 2021

The National Weather Service in Ruskin has issued a

* Severe Thunderstorm Warning for...
  West central Polk County in central Florida...
  Southeastern Hillsborough County in west central Florida...

* Until 500 PM EDT.

* At 433 PM EDT, a severe thunderstorm was located near Brandon,
  moving southeast at 20 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is possible. Wind damage to 
           roofs, siding, and trees is possible.

* Locations impacted include...
  Plant City, Mulberry, Valrico, Alafia River State Park, Brandon,
  Dover, Fish Hawk, Plant City Airport, Lithia Springs State Park and
  Willow Oak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2796 8231 2805 8217 2787 8191 2770 8222
TIME...MOT...LOC 2033Z 318DEG 18KT 2794 8220 

HAIL...1.00IN
WIND...60MPH
 
$$

TBW
2 follow-up statements
958 
WWUS52 KTBW 302040
SVSTBW

Severe Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
440 PM EDT Sun May 30 2021

FLC057-105-302100-
/O.CON.KTBW.SV.W.0015.000000T0000Z-210530T2100Z/
Polk FL-Hillsborough FL-
440 PM EDT Sun May 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR WEST CENTRAL POLK AND SOUTHEASTERN HILLSBOROUGH COUNTIES...

At 439 PM EDT, a severe thunderstorm was located near Fish Hawk,
moving southeast at 20 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Wind damage to roofs, 
         siding, and trees is possible.

Locations impacted include...
Plant City, Mulberry, Valrico, Alafia River State Park, Brandon,
Dover, Fish Hawk, Plant City Airport, Lithia Springs State Park and
Willow Oak.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2796 8231 2805 8217 2787 8191 2770 8222
TIME...MOT...LOC 2039Z 318DEG 18KT 2790 8217 

HAIL...1.25IN
WIND...60MPH
 
$$

TBW
518 
WWUS52 KTBW 302055
SVSTBW

Severe Weather Statement
National Weather Service Tampa Bay Area Ruskin FL
455 PM EDT Sun May 30 2021

FLC057-105-302100-
/O.CON.KTBW.SV.W.0015.000000T0000Z-210530T2100Z/
Polk FL-Hillsborough FL-
455 PM EDT Sun May 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM EDT
FOR WEST CENTRAL POLK AND SOUTHEASTERN HILLSBOROUGH COUNTIES...

At 454 PM EDT, a severe thunderstorm was located near Fish Hawk,
moving southeast at 20 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Wind damage to roofs, 
         siding, and trees is possible.

Locations impacted include...
Plant City, Mulberry, Alafia River State Park, Lithia Springs State
Park, Willow Oak, Fish Hawk, Bloomingdale and Brandon.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 2790 8226 2800 8213 2787 8191 2770 8222
TIME...MOT...LOC 2054Z 319DEG 16KT 2787 8215 

HAIL...1.00IN
WIND...60MPH
 
$$

TBW

The office that day

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

IssuedProductOfficeCountiesLasted
May 30, 2:19 PM EDTSpecial Weather StatementTBWHernando26 min
May 30, 3:45 PM EDTSpecial Weather StatementTBWPasco30 min
May 30, 3:47 PM EDTSpecial Weather StatementTBWPasco28 min
May 30, 4:58 PM EDTSevere Thunderstorm WarningTBWHillsborough, Polk32 min
May 30, 5:05 PM EDTSpecial Weather StatementTBWPolk25 min
May 30, 5:09 PM EDTSpecial Marine WarningTBW36 min
May 30, 5:14 PM EDTSpecial Weather StatementTBWHillsborough16 min
May 30, 5:53 PM EDTSpecial Weather StatementTBWHighlands52 min

Nearby

Severe Thunderstorm Warnings in Florida, 2021Every severe thunderstorm 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.