Alert archive / California / Flash Flood Watches in 2021
Flash Flood Watch 2, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood watch at Mar 10, 2021, 9:55 AM PST for Monterey County, San Benito County, California. It was in force for 12 hr.
The area
The counties it named.
The facts
- Issued
- Mar 10, 2021, 9:55 AM PST (17:55 UTC)
- Expired
- Mar 10, 2021, 10:00 PM PST
- In force
- 12 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Flood severity
- None
Counties Monterey County, CA, San Benito County, CA
The radar
The San Francisco radar (KMUX), 103 km from the middle of the area, began a volume at 17:53 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
Oakland, CA (KOAK), launched 12:00Z, 5.9 hours before the alert went out and 171 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
- 58 J/kg
- Mixed-layer CIN
- -6 J/kg
- Mixed-layer LCL
- 700 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 150 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
203 WGUS66 KMTR 101755 FFAMTR URGENT - IMMEDIATE BROADCAST REQUESTED Flood Watch National Weather Service San Francisco CA 955 AM PST Wed Mar 10 2021 CAZ517-528-110600- /O.NEW.KMTR.FF.A.0002.210310T1755Z-210311T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Lucia Mountains and Los Padres National Forest-Northern Salinas Valley/Hollister Valley and Carmel Valley- Including the cities of Salinas 955 AM PST Wed Mar 10 2021 ...FLASH FLOOD WATCH FOR THE RIVER FIRE BURN AREA IN EFFECT THROUGH THIS EVENING... The National Weather Service in San Francisco has issued a * Flash Flood Watch for the River Fire burn area in a portion of northern California, including the following areas, Northern Salinas Valley/Hollister Valley and Carmel Valley and Santa Lucia Mountains and Los Padres National Forest. * Through this evening * National Weather Service Meteorologists are forecasting additional shower activity today into tonight with intermittent brief periods of heavy rainfall over the River Fire burn area, which may lead to flash flooding and debris flows. Local Officials have reported mudslides have already occurred. Please remain vigilant. * Additional shower activity today into tonight with intermittent brief periods of heavy rainfall over the River Fire burn area is expected up to and during the period of the watch. Residents near the River Fire burn area should prepare for potential flooding impacts. Be sure to stay up to date with information from local authorities. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Flash Flood Watch means that conditions may develop that lead to Flash Flooding. Flash Flooding is a very dangerous situation. You should monitor later forecasts and be prepared to take action should Flash Flood Warnings be issued. Local emergency services are monitoring the situation and will issue a public statement as conditions warrant. PLAN NOW so you will know what to do in an emergency. Keep informed by listening to local radio and television for statements and possible warnings. Follow the advice of public safety officials. && $$ BB
1 follow-up statement
334 WGUS66 KMTR 110604 FFAMTR Flood Watch National Weather Service San Francisco CA 1004 PM PST Wed Mar 10 2021 CAZ517-528-110715- /O.EXP.KMTR.FF.A.0002.000000T0000Z-210311T0600Z/ /00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/ Santa Lucia Mountains and Los Padres National Forest-Northern Salinas Valley/Hollister Valley and Carmel Valley- Including the cities of Salinas 1004 PM PST Wed Mar 10 2021 ...FLASH FLOOD WATCH FOR THE RIVER FIRE BURN AREA HAS EXPIRED... The Flash Flood Watch for a portion of northern California, including the following areas, Northern Salinas Valley/Hollister Valley and Carmel Valley and Santa Lucia Mountains and Los Padres National Forest has expired. Showers are forecast to taper off overnight. Flooding is no longer expected to pose a threat. Please continue to heed any instructions from emergency services personnel. $$ Dykema
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Mar 9, 4:35 PM PST | Special Marine Warning | MTR | 25 min | |
| Mar 10, 11:36 AM PST | Special Weather Statement | MTR | Alameda | 39 min |
| Mar 10, 2:03 PM PST | Small Craft Advisory | MTR | 61 hr |
Nearby
Flash Flood Watches in California, 2021Every flash flood watch 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.