Alert archive / California / Flash Flood Warnings in 1997
Flash Flood Warning 20, NWS San Francisco Bay Area, CA
NWS San Francisco Bay Area, CA issued this flash flood warning at Jan 1, 1997, 7:00 PM PST for San Mateo County, Santa Clara County, Santa Cruz County, California. It was in force for 4 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 1, 1997, 7:00 PM PST (03:00 UTC)
- Expired
- Jan 1, 1997, 11:00 PM PST
- In force
- 4 hr
- Issued by
- NWS San Francisco Bay Area, CA
- Area
- Whole counties
Counties San Mateo County, CA, Santa Clara County, CA, Santa Cruz County, CA
The radar
The San Francisco radar (KMUX), 14 km from the middle of the area, began a volume at 03:01 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 00:00Z, 3.0 hours before the alert went out and 58 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
- 533 m above ground
- 0-6 km bulk shear
- 77 kt
- 0-1 km storm-relative helicity
- 216 m²/s²
- 0-3 km storm-relative helicity
- 322 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 020257 RRA FFWSFO CAC081-085-087-020700- BULLETIN - EAS ACTIVATION REQUESTED FLASH FLOOD WARNING NATIONAL WEATHER SERVICE SAN FRANCISCO CA 700 PM PST WED JAN 1 1997 THE NATIONAL WEATHER SERVICE IN SAN FRANCISCO HAS EXTENDED THE FLASH FLOOD WARNING EFFECTIVE UNTIL 11 PM PST FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN CENTRAL CALIFORNIA ...SOUTHWESTERN SAN MATEO COUNTY...SANTA CRUZ COUNTY...AND WESTERN SANTA CLARA COUNTY... AT 7 PM MODERATE TO HEAVY RAIN CONTINUED ACROSS SANTA CRUZ... SOUTHWESTERN SAN MATEO...AND SANTA CLARA COUNTIES. CREEKS AND RIVERS WERE RUNNING BANKFULL OR FLOODING THROUGHOUT THIS AREA. AT 6 PM THE SAN LORENZO RIVER AT FELTON WAS AT 16.8 FEET AND RISING. SOQUEL CREEK WAS AROUND 13 FEET AND RISING. AT 630 PM CORRALITOS CREEK AT FREEDOM WAS RISING RAPIDLY AT A STAGE OF 12.4 FEET. OTHER PROBLEM CREEKS INCLUDE LLAGAS CREEK BETWEEN MORGAN HILL AND GILROY..AND PESCADERO CREEK IN SOUTHWESTERN SAN MATEO COUNTY. STREET FLOODING HAS ALSO BEEN REPORTED IN MORGAN HILL AND GILROY. MODERATE TO HEAVY RAINFALL WILL CONTINUE OVER THE WARNING AREA UNTIL AT LEAST 11 PM...ESPECIALLY IN THE MOUNTAINS. DURING THE LAST 24 HOURS RAINFALL TOTALS IN THE SANTA CRUZ MOUNTAINS...AROUND UVAS RESERVOIR...AND IN THE MORGAN HILL-GILROY AREA HAVE RANGED FROM FOUR TO SEVEN INCHES. 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 SATFELY. VEHICLES CAUGHT IN RISING WATER SHOULD BE ABANDONED QUICKLY. MOVE TO HIGHER GROUND. MUDSLIDES ARE ALSO POSSIBLE IN THE WARNING AREA. MARKKANEN
The office that day
Everything else NWS San Francisco Bay Area, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jan 1, 5:03 PM PST | Flash Flood Warning | MTR | Santa Clara | 117 min |
| Jan 1, 7:22 PM PST | Flash Flood Warning | MTR | San Luis Obispo | 6 hr |
| Jan 1, 10:59 PM PST | Flash Flood Warning | MTR | San Mateo, Santa Clara, Santa Cruz | 3 hr |
| Jan 2, 5:52 AM PST | Flash Flood Warning | MTR | San Mateo, Santa Clara, Santa Cruz | 3 hr |
| Jan 2, 5:52 AM PST | Flash Flood Warning | MTR | Alameda, Contra Costa | 3 hr |
| Jan 2, 11:45 AM PST | Flash Flood Warning | MTR | Alameda, San Mateo, Santa Clara, Santa Cruz | 4 hr |
| Jan 2, 11:45 AM PST | Flash Flood Warning | MTR | Monterey | 4 hr |
| Jan 2, 11:45 AM PST | Flash Flood Warning | MTR | Contra Costa | 4 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.