Alert archive / California / Severe Thunderstorm Warnings in 1989
Severe Thunderstorm Warning 2, NWS Los Angeles, CA
NWS Los Angeles, CA issued this severe thunderstorm warning at Aug 9, 1989, 4:00 PM PDT for Riverside County, California. It was in force for 3 hr. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Aug 9, 1989, 4:00 PM PDT (23:00 UTC)
- Expired
- Aug 9, 1989, 7:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS Los Angeles, CA
- Area
- Whole counties
County Riverside County, CA
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Aug 9, 5:20 PM PDT | Thunderstorm Wind 61 | Riverside, CA |
NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in. Storm Data before 1996 records only tornadoes, thunderstorm wind and hail.
The nearest sounding before it
San Diego, CA (KNKX), launched 12:00Z, 11.0 hours before the alert went out and 154 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
- 3639 m above ground
- 0-6 km bulk shear
- 4 kt
- 0-1 km storm-relative helicity
- 15 m²/s²
- 0-3 km storm-relative helicity
- 59 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
In the hours before
Special weather statement, Aug 9, 11:41 AM PDT, 4 hours 19 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE LOS ANGELES CA 1140 AM PDT WED AUG 9 1989 ...THUNDERSTORMS DEVELOPING IN SOUTHERN CA MOUNTAINS AND DESERTS... A SOUTHERLY FLOW ALOFT OF MOIST UNSTABLE AIR CONTINUES OVER THE SOUTHLAND TODAY...AND WIDELY SCATTERED THUNDERSTORMS ARE BEGINNING TO DEVELOP IN THE MOUNTAINS AND INTERIOR. TODAYS THUNDERSTORM ACTIVITY WILL BE ACCOMPANIED BY DEADLY LIGHTNING... BRIEF HEAVY RAIN...AND GUSTY WINDS. MINOR FLOODING OF ROADWAYS MAY ACCOMPANY THE BRIEF HEAVY RAIN...DO NOT ATTEMPT TO CROSS FLOODED ROADWAYS. IN ADDITION...LOCAL STRONG GUSTY WINDS MAY PRODUCE BLOWING DUST TAT MAY BRIEFLY REDUCE VISIBILTIES. IF YOU ARE IN THE MOUNTAIN OR INTERIOR SECTIONS...KEEP ADVISED OF THE LATEST ADVISED OF THE LATEST WEATHER INFORMATION. IT IS POSSIBLE THAT LOCALIZED FLASH FLOODING WILL DEVELOP ASSOCIATED WITH THE HEAVIER THUNDERSTORMS THIS AFTERNOON AND EVENING. STAY CLEAR OF DESERT DRY WASHES...OR BE P|REPARED TO MOVE TO HIGHER GROUND IF YOU SEE THUNDERSTORM ACTIVITY NEARBY. FURTHER STATEMENTS WILL BE ISSUED AS CONDITIONS WARRANT. HAMILTON
Local storm report, Aug 9, 1:56 PM PDT, 2 hours 4 minutes before
STORM REPORT
NATIONAL WEATHER SERVICE LOS ANGELES, CA
1255 PM PST WED AUG 09 1989
FOLLOWING INFORMATION IS FROM THE SERIES OF THUNDERSTORMS IN
SOUTHERN CALIFORNIA ON AUGUST 8 1989.
THUNDERSTORMS FORMED ALONG THE EAST SIDE OF MANY OF THE MOUNTAIN
RANGES DURING THE AFTERNOON. THE MORE SIGNIFICANT ONES PRODUCED HEAVY
SHOWERS OVER THE HIGHER REACHES OF THE MOUNTAINS WITH LIGHTER AMOUNTS
IN THE VALLEY AREAS.
509PM PDT...INYO COUNTY...10S OF LONE PINE. HEAVY RAINS IN THE MOUNTAINS
CAUSED MUD TO COVER ALL 4 LANES OF U.S. 395 APPROXIMATELY
1-1 1/2 FT DEEP. ROAD CLOSED FROM 515PM TO 430AM WED.
706PM PDT...INYO COUNTY...OLANCHA. APPROXIMATELY 1 MILE NORTH AND SOUTH
OF HIGHWAYS 395/190 JUNCTION. FLOW FROM MOUNTAIN THUNDER/
STORMS WASHED CONSIDERABLE DEBRIS INTO AQUEDUCT COMPLETELY
DAMMING IT. WATER AND MUD WAS OVER HIGHWAY JUNCTION AREA.
1 MILE OF AQUEDUCT COMPLETELY FILLED WITH DEBRIS AND MORE
THAN 1 MILE WITH VARIOUS AMOUNTS OF DEBRIS. 10-14 DAYS
ESTIMATED TO CLEAR.
SOME DEBRIS OVER HIGHWAY 168 NEAR DEEP SPRINGS AREA ESE OF BISHOP DUE
TO HEAVY RAINS. LOCAL FLOODING OCCURRED IN THE SHERWOOD CREEK AREA
SW OF BISHOP IN THE LATE AFTERNOON AND EVENING.
IN MONO COUNTY...LOCAL FLOODING 10-15 W OF LEE VINING WHERE HEAVY RAIN
REPORTED FOR 1-2 HOURS. ROCK AND DEBRIS SLIDES NEAR TIOGA PASS WITH
A CAR OFF THE ROAD DURING MORNING OF AUG 8 DUE TO RAINS.
RAINFALL REPORTS...
OAK CREEK .40 CAINE RANCH .61
ROUND VALLEY .10 TINAMAHA...S OF BIG PINE. .08
BENTON .13 LONE PINE OVER 1.00
ROCK CREEK .10 INDEPENDENCE .18
WILD ROSE .08 HAIWEE .08
STOVEPIPE WELLS .20 BISHOP T
BIG PINE .21 MAMMOTH LAKES OVER 1.00
LONG VALLEY .39
M_CDUFFIEThe office that day
Everything else NWS Los Angeles, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 9, 4:00 PM PDT | Flash Flood Warning | LOX | Riverside | 3 hr |
Nearby
Severe Thunderstorm Warnings in California, 1989Every severe thunderstorm warning in 1989
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.