Alert archive / California / Flash Flood Warnings in 1998

Flash Flood Warning 21, NWS Sacramento, CA

August 14, 19984 counties in California

NWS Sacramento, CA issued this flash flood warning at Aug 14, 1998, 3:09 PM PDT for 4 counties in California. It was in force for 2 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
Aug 14, 1998, 3:09 PM PDT (22:09 UTC)
Expired
Aug 14, 1998, 5:10 PM PDT
In force
2 hr
Issued by
NWS Sacramento, CA
Area
Whole counties

Counties Alpine County, CA, Amador County, CA, Calaveras County, CA, Tuolumne County, CA

The nearest sounding before it

Oakland, CA (KOAK), launched 12:00Z, 10.2 hours before the alert went out and 183 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, Oakland, CA at 12:00Z on 1998-08-14Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 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, Oakland, CA at 12:00Z on 1998-08-14The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 17 square meters per square second.1939Sfc1 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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1659 m above ground
0-6 km bulk shear
14 kt
0-1 km storm-relative helicity
17 m²/s²
0-3 km storm-relative helicity
41 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

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

000 
TTAA00 KSAC 142210
FFWSAC
CAC003-005-009-017-109-150010-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SACRAMENTO CA
309 PM PDT FRI AUG 14 1998

THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  EAST CENTRAL EL DORADO COUNTY IN NORTHERN CALIFORNIA
  EXTREME EASTERN AMADOR COUNTY IN CENTRAL CALIFORNIA
  WESTERN ALPINE COUNTY IN CENTRAL CALIFORNIA
  EXTREME EASTERN CALAVERAS COUNTY IN CENTRAL CALIFORNIA
  NORTHEASTERN TUOLUMNE COUNTY IN CENTRAL CALIFORNIA

* UNTIL 510 PM PDT

* SINCE 130 PM PDT... NATIONAL WEATHER SERVICE DOPPLER RADAR HAS
  INDICATED VERY HEAVY RAIN ALONG AND JUST WEST OF THE SIERRA NEVADA
  CREST FROM EAST-CENTRAL EL DORADO COUNTY SOUTH TO NORTHEASTERN
  TUOLUMNE COUNTY...STORMS ARE SHOWING LITTLE MOVEMENT.

* PERSISTANT HEAVY RAINS IN THIS AREA FOR OVER THE PAST HOUR WILL
  LIKELY PRODUCE FLASH FLOODING OF CREEKS IN THE WARNING AREA. IN
  ADDITION HIGHWAYS 88...4.V..AND 108 MAY BE AFFECTED BY ROCKSLIDES
  AND HIGH WATER.

MOVE TO HIGHER GROUND IF FLOOD WATERS THREATEN.

DFR

The office that day

Everything else NWS Sacramento, CA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 14, 2:21 PM PDTSevere Thunderstorm WarningSTOAlpine59 min
Aug 14, 3:09 PM PDTFlash Flood WarningSTOEl Dorado2 hr

Nearby

Flash Flood Warnings in California, 1998Every flash flood warning in 1998

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.