Alert archive / California / Flash Flood Warnings in 2001

Flash Flood Warning 3, NWS San Diego, CA

February 27, 2001San Diego County, California

NWS San Diego, CA issued this flash flood warning at Feb 27, 2001, 4:11 PM PST for San Diego County, California. It was in force for 49 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued: Feb 27, 2001, 4:11 PM PST (00:11 UTC)
Expired: Feb 27, 2001, 5:00 PM PST
In force: 49 min
Issued by: NWS San Diego, CA
Area: Whole counties

County San Diego County, CA

The radar

The San Diego radar (KNKX), 28 km from the middle of the area, began a volume at 00:11 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

San Diego, CA (KNKX), launched 00:00Z, 0.2 hours before the alert went out and 47 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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: 26 J/kg
Mixed-layer CIN: -3 J/kg
Mixed-layer LCL: 746 m above ground
0-6 km bulk shear: 24 kt
0-1 km storm-relative helicity: -12 m²/s²
0-3 km storm-relative helicity: -1 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 
WGUS56 KSGX 280014
FFWSAN
CAC073-280100-

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SAN DIEGO CA
411 PM PST TUE FEB 27 2001

THE NATIONAL WEATHER SERVICE IN SAN DIEGO HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  WESTERN SAN DIEGO COUNTY IN SOUTHERN CALIFORNIA
  THIS INCLUDES CITIES SUCH AS CARLSBAD....ENCINITAS...  
  ESCONDIDO...FALLBROOK...LA MESA...LAKESIDE...OCEANSIDE...POWAY...  
  SAN DIEGO...SAN MARCOS...SANTEE...VISTA

* UNTIL 500 PM PST

* AT 406 PM PST...WEATHER SERVICE DOPPLER RADAR INDICATED VERY 
  HEAVY RAIN OVER WESTERN SAN DIEGO COUNTY...CENTERED NEAR 
  POWAY...MIRAMAR LAKE...AND SCRIPPS RANCH. THE AREA OF 
  HEAVY RAIN WAS NEARLY STATIONARY.

A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT OR OCCURRING.
IF YOU ARE IN THE WARNING AREA MOVE TO HIGHER GROUND IMMEDIATELY.
RESIDENTS LIVING ALONG STREAMS AND CREEKS SHOULD TAKE IMMEDIATE
PRECAUTIONS TO PROTECT LIFE AND PROPERTY. DO NOT ATTEMPT TO CROSS
SWIFTLY FLOWING WATERS OR WATERS OF UNKNOWN DEPTH BY FOOT OR BY
AUTOMOBILE. IF YOUR VEHICLE STALLS, ABANDON IT IMMEDIATELY AND SEEK
HIGHER GROUND.

TO REPORT SEVERE WEATHER HAVE THE NEAREST LAW ENFORCEMENT AGENCY
RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST OFFICE IN
SAN DIEGO.

$$

LAT...LON 3321 11738 3267 11714 3289 11684 3319 11668
          3339 11683 3339 11725

SMALL

What forecasters said that day

The local office's own words before this flash flood warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS San Diego, CA wrote its last area forecast discussion before this flash flood warning went out at Feb 27, 2:30 PM PST, 1 hour 41 minutes earlier.

Area forecast discussion, Feb 27, 2:30 PM PST, 1 hour 41 minutes before

EXTREME SOUTHWESTERN CALIFORNIA AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE SAN DIEGO CA
230 PM PST TUE FEB 27 2001

                             ...SYNOPSIS...

UPPER LEVEL LOW PRESSURE OVER THE SOUTHWEST COMBINED WITH A MOIST
AIR MASS WILL CAUSE A GRADUALLY DECREASING CHANCE OF SHOWERS INTO
THURSDAY. THERE WILL ALSO BE SOME THUNDERSTORMS. GENERALLY DRY
FRIDAY AND SATURDAY AS THE STORM TRACK SHIFTS NORTH. ANOTHER
PACIFIC STORM COULD BRING MORE SHOWERS VERY LATE IN THE WEEKEND OR
EARLY NEXT WEEK.

                            ...DISCUSSION...
WITH AFTERNOON HEATING GOOD CONVECTION HAS DEVELOPED WITH ISOLATED
THUNDERSTORMS. MODELS SHOW UPPER LEVEL LOW SOUTHWEST OF
SAN DIEGO WILL DRIFT NORTHEAST OVER THE NEXT 12-18 HOURS BUT WILL BE
REPLACED BY ANOTHER COLD LOW DROPPING RAPIDLY SOUTH OFF THE COAST
WEDNESDAY NIGHT AND THURSDAY. GIVEN THE FACT THAT COLD AIR WILL
PRETTY MUCH STAY IN PLACE ALOFT OVER THE CWA THROUGH THE PERIOD
EXPECT SHOWERS AND ISOLATED THUNDERSTORMS TO CONTINUE THROUGH
WEDNESDAY NIGHT. MAY STILL BE ENOUGH INSTABILITY AROUND THURSDAY
MORNING FOR A CHANCE OF SHOWERS BUT CONDITIONS SHOULD BE IMPROVING
THURSDAY. ENOUGH SNOW AT HIGHER ELEVATIONS IN SAN BERNARDINO AND
RIVERSIDE COUNTIES TO RAISE WINTER STORM WARNINGS THROUGH WEDNESDAY.
SNOW LEVELS WILL REMAIN AROUND 4000 TO 5000FT THROUGH THE PERIOD.

NEW AVN FASTER AND THUS MORE PROGRESSIVE BUT NOT QUITE AS DEEP WITH SYSTEM
SUNDAY INTO MONDAY. SO AM INCLINED TO GO WITH A CHANCE OF RAIN OR
SNOW UNTIL IT BECOMES CLEARER AS TO HOW THE MODELS WILL HANDLE IT.
IN ANY CASE SYSTEM SHOULD BE GONE BY TUESDAY WITH A DRY DAY EXPECTED.

SAN 9743

ECC

Nearby

Flash Flood Warnings in California, 2001 Every flash flood warning in 2001

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.