Alert archive / Florida / Flood Watches in 2021
Flood Watch 4, NWS Melbourne, FL
NWS Melbourne, FL issued this flood watch at Dec 20, 2021, 9:21 AM EST for Volusia County, Florida. It took effect at Dec 20, 2021, 2:00 PM EST. It was in force for 14 hr.
The area
The counties it named.
The facts
- Issued
- Dec 20, 2021, 9:21 AM EST (14:21 UTC)
- In effect from
- Dec 20, 2021, 2:00 PM EST
- Expired
- Dec 21, 2021, 4:00 AM EST
- In force
- 14 hr
- Issued by
- NWS Melbourne, FL
- Flood severity
- None
County Volusia County, FL
The radar
The Melbourne radar (KMLB), 116 km from the middle of the area, began a volume at 14:23 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
Cape Canaveral, FL (KXMR), launched 12:00Z, 2.4 hours before the alert went out and 91 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.
- Mixed-layer CAPE
- 1 J/kg
- Mixed-layer CIN
- -68 J/kg
- Mixed-layer LCL
- 736 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -6 m²/s²
- 0-3 km storm-relative helicity
- 34 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
550 WGUS62 KMLB 201421 FFAMLB URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service Melbourne FL 921 AM EST Mon Dec 20 2021 .Persistent heavy showers and storms may produce locally heavy rainfall across portions of coastal Volusia, Brevard, and Indian River counties beginning this afternoon through the overnight hours. Rainfall amounts of 3 to 4 inches are possible with locally higher amounts of up to 6 inches. FLZ047-054-141-147-210900- /O.NEW.KMLB.FA.A.0004.211220T1900Z-211221T0900Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Southern Brevard-Indian River-Coastal Volusia-Northern Brevard- Including the cities of Vero Beach, Rockledge, Daytona Beach, Titusville, Melbourne, Palm Bay, New Smyrna Beach, Ormond Beach, Sebastian, and Cocoa 921 AM EST Mon Dec 20 2021 ...FLOOD WATCH IN EFFECT FROM 2 PM EST THIS AFTERNOON THROUGH LATE TONIGHT... * WHAT...Flooding caused by excessive rainfall is possible. * WHERE...A portion of east central Florida, including the following areas, Coastal Volusia, Indian River, Northern Brevard and Southern Brevard. * WHEN...From 2 PM EST this afternoon through late tonight. * IMPACTS...Excessive runoff may result in flooding of creeks, streams, and other low-lying and flood-prone locations. Flooding may occur in poor drainage and urban areas. * ADDITIONAL DETAILS... - http://www.weather.gov/safety/flood PRECAUTIONARY/PREPAREDNESS ACTIONS... You should monitor later forecasts and be alert for possible Flood Warnings. Those living in areas prone to flooding should be prepared to take action should flooding develop. && $$ KN
The office that day
Everything else NWS Melbourne, FL issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 20, 3:53 AM EST | Beach Hazards Statement | MLB | Volusia | 15 hr |
| Dec 20, 3:10 PM EST | Areal Flood Advisory | MLB | Brevard | 4 hr |
| Dec 20, 4:32 PM EST | Areal Flood Advisory | MLB | Brevard | 88 min |
Nearby
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.