Alert archive / California / Flash Flood Warnings in 1997
Flash Flood Warning 38, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 25, 1997, 4:00 AM PST for Napa County, Sonoma County, California. It was in force for 8 hr. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jan 25, 1997, 4:00 AM PST (12:00 UTC)
- Expired
- Jan 25, 1997, 12:00 PM PST
- In force
- 8 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
Counties Napa County, CA, Sonoma County, CA
The radar
The Sacramento radar (KDAX), 83 km from the middle of the area, began a volume at 12:00 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
Reno, NV (KREV), launched 12:00Z, 0.0 hours before the alert went out and 400 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 585 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 324 m²/s²
- 0-3 km storm-relative helicity
- 478 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSFO 251200 FFWSFO CAC041-075-055-097-252000- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 400 AM PST SAT JAN 25 1997 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS ISSUED A FLASH FLOOD WARNING EFFECTIVE UNTIL NOON PST FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN CENTRAL CALIFORNIA ...MARIN COUNTY...SAN FRANCISCO COUNTY IN NORTH CENTRAL CALIFORNIA ...NAPA COUNTY...SONOMA COUNTY HEAVY RAIN IS BEGINNING TO MOVE INTO THE NORTH BAY COUNTIES EARLY THIS MORNING. SO FAR...SONOMA COUNTY HAS RECEIVED 1 TO 1.5 INCHES OVER THE PAST 3 HOURS. RAIN RATES HAVE BEEN .3 TO .5 OVER THE PAST TWO HOURS. THE PACIFIC FRONT IS STILL OFF SHORE...BUT WILL CONTINUE TO MOVE SLOWLY EASTWARD THROUGHOUT THE MORNING HOURS ACROSS THE WARNING AREA. HEAVY RAIN WILL CONTINUE OVER THE WARNING AREA FOR THE NEXT 3 TO 4 HOURS. CREEKS AND SMALL RIVERS IN THE WARNING AREA WILL RISE AND BECOME BANKFUL QUICKLY. ALSO EXPECT WIDESPREAD URBAN FLOODING AND MUDSLIDES IN THE WARNING AREA THIS MORNING. BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE THE DANGERS OF FLOODS AND FLASH FLOODS. IF FLASH FLOODING IS OBSERVED...ACT QUICKLY. MOVE UP TO ESCAPE FLOOD WATERS. DO NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING. DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE ROADWAY. THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO CROSS SAFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. COX
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 25, 4:00 AM PST | Flash Flood Warning | MTR | City and County of San Francisco | 8 hr |
| Jan 25, 4:00 AM PST | Flash Flood Warning | MTR | Marin | 8 hr |
| Jan 25, 5:35 AM PST | Flash Flood Warning | MTR | San Mateo, Santa Clara, Santa Cruz | 6 hr |
| Jan 25, 5:35 AM PST | Flash Flood Warning | MTR | Alameda, Contra Costa | 6 hr |
Nearby
Flash Flood Warnings in California, 1997Every flash flood warning in 1997
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.