Alert archive / Florida / Tornado Warnings in 2010

Tornado Warning 1, NWS Key West, FL

April 26, 2010Monroe County, Florida

NWS Key West, FL issued this tornado warning at Apr 26, 2010, 12:23 PM EDT for Monroe 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 26, 2010, 12:23 PM EDT (16:23 UTC)
Expired
Apr 26, 2010, 12:45 PM EDT
In force
22 min
Issued by
NWS Key West, FL
Area
Storm-based polygon

County Monroe County, FL

The radar

The Miami radar (KAMX), 52 km from the middle of the area, began a volume at 16:24 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

Miami, FL (KMFL), launched 12:00Z, 4.4 hours before the alert went out and 76 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 12:00Z on 2010-04-26Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 3216 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 12:00Z on 2010-04-26The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 117 square meters per square second.1939587897Sfc1 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
3216 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
525 m above ground
0-6 km bulk shear
58 kt
0-1 km storm-relative helicity
117 m²/s²
0-3 km storm-relative helicity
147 m²/s²
Significant tornado parameter
2.5
Supercell composite
9.2

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

989 
WFUS52 KKEY 261623
TORKEY
FLC087-261645-
/O.NEW.KKEY.TO.W.0001.100426T1623Z-100426T1645Z/

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE KEY WEST FL
1223 PM EDT MON APR 26 2010

THE NATIONAL WEATHER SERVICE IN KEY WEST HAS ISSUED A

* TORNADO WARNING FOR...
  UPPER KEYS IN MONROE COUNTY IN FLORIDA...
  THIS INCLUDES THE COMMUNITY OF KEY LARGO...

* UNTIL 1245 PM EDT

* AT 1219 PM EDT...NATIONAL WEATHER SERVICE METEOROLOGISTS DETECTED A
  SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO 11 MILES WEST OF
  ROCK HARBOR...OR 12 MILES WEST OF KEY LARGO...MOVING EAST AT 40
  MPH.

* THE TORNADO WILL BE NEAR...
  KEY LARGO AND ROCK HARBOR BY 1235 PM EDT...
  ROUTE 1/CARD SOUND ROAD S AND ROUTE 1/CARD SOUND ROAD SPLIT BY 1240
  PM EDT...

PRECAUTIONARY/PREPAREDNESS ACTIONS...

WHEN A TORNADO WARNING IS ISSUED BASED ON DOPPLER RADAR...IT MEANS
THAT STRONG ROTATION HAS BEEN DETECTED IN THE STORM. A TORNADO MAY 
ALREADY BE OCCURRING...OR IS EXPECTED TO DEVELOP SHORTLY. IF YOU ARE 
IN THE PATH OF THIS DANGEROUS STORM...MOVE INDOORS AND TO THE LOWEST 
LEVEL OF THE BUILDING. STAY AWAY FROM WINDOWS. IF DRIVING...DO NOT 
SEEK SHELTER UNDER A HIGHWAY OVERPASS.

PLEASE REPORT SEVERE WEATHER TO THE NEAREST LOCAL LAW ENFORCEMENT
AGENCY OR THE U.S. COAST GUARD...AND ASK THAT YOUR REPORT BE RELAYED
TO THE NATIONAL WEATHER SERVICE KEY WEST. YOU MAY CONTACT THE
NATIONAL WEATHER SERVICE DIRECTLY AT 3 0 5...2 9 5...1 3 1 6...
EXTENSION 3.

&&

LAT...LON 2518 8036 2516 8035 2509 8043 2505 8044
      2505 8046 2507 8044 2507 8046 2502 8049
      2502 8052 2508 8047 2513 8049 2519 8045
      2523 8049 2524 8042 2521 8040 2521 8038
      2526 8034 2527 8029
TIME...MOT...LOC 1622Z 258DEG 37KT 2510 8060

$$

BWC
1 follow-up statement
337 
WWUS52 KKEY 261648
SVSKEY

SEVERE WEATHER STATEMENT
NATIONAL WEATHER SERVICE KEY WEST FL
1248 PM EDT MON APR 26 2010

FLC087-261655-
/O.EXP.KKEY.TO.W.0001.000000T0000Z-100426T1645Z/
UPPER KEYS IN MONROE FL-
1248 PM EDT MON APR 26 2010

...THE TORNADO WARNING FOR UPPER KEYS IN MONROE COUNTY HAS EXPIRED...

DOPPLER RADAR INDICATES THAT THE THUNDERSTORM MOVING INTO THE KEY 
LARGO AREA HAS WEAKENED AND NO LONGER DETECTS TORNADO ROTATION AS OF 
1245 PM EDT. THE LINE OF THUNDERSTORMS THAT PRODUCED THIS ROTATION 
CONTINUES TO MOVE SOUTH NEAR 10 MPH. WIND GUSTS TO 45 MPH ARE STILL 
AND FREQUENT LIGHTNING IS POSSIBLE IN THIS LINE OF THUNDERSTORMS.

LAT...LON 2518 8036 2516 8035 2509 8043 2505 8044
      2505 8046 2507 8044 2507 8046 2502 8049
      2502 8052 2508 8047 2513 8049 2519 8045
      2523 8049 2524 8042 2521 8040 2521 8038
      2526 8034 2527 8029
TIME...MOT...LOC 1645Z 258DEG 37KT 2515 8034

$$

BWC

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 8:56 AM EDTSpecial Marine WarningKEY64 min
Apr 26, 9:53 AM EDTSpecial Marine WarningKEY52 min
Apr 26, 10:47 AM EDTSpecial Marine WarningKEY58 min
Apr 26, 11:37 AM EDTSpecial Marine WarningKEY53 min
Apr 26, 12:08 PM EDTSpecial Marine WarningKEY52 min
Apr 26, 12:39 PM EDTSpecial Marine WarningKEY66 min
Apr 26, 1:09 PM EDTSpecial Marine WarningKEY66 min
Apr 26, 1:40 PM EDTSpecial Marine WarningKEY65 min
Apr 26, 3:09 PM EDTSpecial Marine WarningKEY66 min
Apr 26, 4:03 PM EDTSpecial Marine WarningKEY57 min
Apr 26, 4:59 PM EDTSpecial Marine WarningKEY61 min

Nearby

Tornado Warnings in Florida, 2010Every tornado warning in 2010Tornadoes in 2010

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.