Alert archive / Florida / Severe Thunderstorm Warnings in 2023

Severe Thunderstorm Warning 21, NWS Miami, FL

April 30, 2023Collier County, Glades County, Hendry County, Florida

NWS Miami, FL issued this severe thunderstorm warning at Apr 30, 2023, 7:41 AM EDT for Collier County, Glades County, Hendry County, Florida. It was in force for 34 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 30, 2023, 7:41 AM EDT (11:41 UTC)
Expired
Apr 30, 2023, 8:15 AM EDT
In force
34 min
Issued by
NWS Miami, FL
Area
Storm-based polygon
Tornado
Possible
Hail
0.75 in
Wind
60.0 mph

Counties Collier County, FL, Glades County, FL, Hendry County, FL

The radar

The Miami radar (KAMX), 146 km from the middle of the area, began a volume at 11:40 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 30, 5:03 AM EDTTornado WatchSPC7 hr

The nearest sounding before it

Miami, FL (KMFL), launched 00:00Z, 11.7 hours before the alert went out and 143 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, Miami, FL at 00:00Z on 2023-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1237 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, Miami, FL at 00:00Z on 2023-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 49 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
1237 J/kg
Mixed-layer CIN
-11 J/kg
Mixed-layer LCL
1284 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
49 m²/s²
0-3 km storm-relative helicity
76 m²/s²
Significant tornado parameter
0.2
Supercell composite
2.8

Open this sounding in Storm Lab

The text

As transmitted.

968 
WUUS52 KMFL 301141
SVRMFL
FLC021-043-051-301215-
/O.NEW.KMFL.SV.W.0021.230430T1141Z-230430T1215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Miami FL
741 AM EDT Sun Apr 30 2023

The National Weather Service in Miami has issued a

* Severe Thunderstorm Warning for...
  Northwestern Collier County in southwestern Florida...
  Northwestern Hendry County in southern Florida...
  South central Glades County in southern Florida...

* Until 815 AM EDT.

* At 740 AM EDT, severe thunderstorms were located along a line
  extending from Port La Belle to near Big Corkscrew Island, moving
  northeast at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Labelle, Moore Haven, Ave Maria, Immokalee and Golden Gate Estates.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 200 PM EDT for southern and
southwestern Florida.

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

A Tornado Watch remains in effect until 200 PM EDT for southern and
southwestern Florida.

&&

LAT...LON 2632 8166 2633 8166 2642 8162 2642 8156
      2655 8157 2683 8145 2684 8109 2626 8138
      2628 8168
TIME...MOT...LOC 1140Z 224DEG 43KT 2673 8139 2639 8155 

TORNADO...POSSIBLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

CWC

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 29, 9:27 PM EDTSpecial Weather StatementMFLGlades48 min
Apr 29, 10:18 PM EDTSpecial Marine WarningMFL42 min
Apr 29, 10:49 PM EDTSpecial Weather StatementMFLMonroe26 min
Apr 29, 10:57 PM EDTSpecial Marine WarningMFL33 min
Apr 29, 11:26 PM EDTSpecial Weather StatementMFLMonroe34 min
Apr 30, 12:10 AM EDTSpecial Weather StatementMFLMiami-Dade35 min
Apr 30, 12:30 AM EDTSpecial Weather StatementMFLMiami-Dade45 min
Apr 30, 4:22 AM EDTRip Current StatementMFLCollier40 hr
Apr 30, 5:41 AM EDTSpecial Marine WarningMFL94 min
Apr 30, 6:37 AM EDTTornado WarningMFLGlades23 min
Apr 30, 6:51 AM EDTSpecial Marine WarningMFL54 min
Apr 30, 7:00 AM EDTTornado WarningMFLGlades15 min
Apr 30, 7:01 AM EDTSpecial Marine WarningMFL89 min
Apr 30, 7:13 AM EDTSpecial Weather StatementMFLGlades32 min
Apr 30, 7:15 AM EDTSpecial Weather StatementMFLCollier45 min
Apr 30, 7:28 AM EDTTornado WarningMFLGlades17 min
Apr 30, 7:45 AM EDTSpecial Marine WarningMFL60 min
Apr 30, 8:06 AM EDTSevere Thunderstorm WarningMFLBroward, Collier, Glades, Hendry, Palm Beach24 min
Apr 30, 8:12 AM EDTTornado WarningMFLCollier, Hendry17 min
Apr 30, 8:31 AM EDTSevere Thunderstorm WarningMFLHendry, Palm Beach44 min
Apr 30, 8:33 AM EDTSpecial Marine WarningMFL27 min
Apr 30, 8:40 AM EDTSpecial Marine WarningMFL95 min
Apr 30, 8:49 AM EDTSpecial Weather StatementMFLBroward41 min
Apr 30, 9:01 AM EDTSpecial Marine WarningMFL59 min
Apr 30, 9:11 AM EDTSevere Thunderstorm WarningMFLPalm Beach49 min
Apr 30, 9:19 AM EDTTornado WarningMFLPalm Beach26 min
Apr 30, 9:30 AM EDTSpecial Weather StatementMFLBroward, Monroe45 min
Apr 30, 9:31 AM EDTTornado WarningMFLPalm Beach28 min
Apr 30, 10:00 AM EDTSpecial Weather StatementMFLPalm Beach30 min
Apr 30, 10:01 AM EDTSpecial Marine WarningMFL59 min
Apr 30, 10:14 AM EDTSpecial Weather StatementMFLBroward, Miami-Dade46 min
Apr 30, 10:19 AM EDTSevere Thunderstorm WarningMFLBroward26 min
Apr 30, 10:33 AM EDTSevere Thunderstorm WarningMFLBroward5 min
Apr 30, 10:36 AM EDTSpecial Marine WarningMFL54 min
Apr 30, 10:55 AM EDTSpecial Marine WarningMFL65 min
Apr 30, 10:56 AM EDTSpecial Weather StatementMFLBroward34 min
Apr 30, 11:29 AM EDTSpecial Marine WarningMFL61 min
Apr 30, 11:36 AM EDTSpecial Marine WarningMFL54 min
Apr 30, 6:13 PM EDTSmall Craft AdvisoryMFL14 hr

Nearby

Severe Thunderstorm Warnings in Florida, 2023Every severe thunderstorm warning in 2023

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.