Alert archive / California / Severe Thunderstorm Warnings in 2009
Severe Thunderstorm Warning 11, NWS Eureka, CA
NWS Eureka, CA issued this severe thunderstorm warning at Jun 3, 2009, 4:00 PM PDT for Mendocino County, California. It was in force for 18 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Jun 3, 2009, 4:00 PM PDT (23:00 UTC)
- Expired
- Jun 3, 2009, 4:18 PM PDT
- In force
- 18 min
- Issued by
- NWS Eureka, CA
- Area
- Storm-based polygon
County Mendocino County, CA
The radar
The Eureka (Bunker Hill) radar (KBHX), 133 km from the middle of the area, began a volume at 23:02 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Jun 3, 4:20 PM PDT | HAIL 0.88 | 15 N Potter Valley, CA | HARTSTONE BIBLE CONFERENCE NORTH OF POTTER VALLEY REPORTED DIME-NICKEL SIZE HAIL IN THUNDERSTORM. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.
Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 11.0 hours before the alert went out and 229 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
- 758 m above ground
- 0-6 km bulk shear
- 48 kt
- 0-1 km storm-relative helicity
- 13 m²/s²
- 0-3 km storm-relative helicity
- 175 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 1.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 WUUS56 KEKA 032300 SVREKA CAC045-032330- /O.NEW.KEKA.SV.W.0011.090603T2300Z-090603T2330Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE EUREKA CA 400 PM PDT WED JUN 3 2009 THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... CENTRAL MENDOCINO COUNTY IN NORTHWEST CALIFORNIA... * UNTIL 430 PM PDT * AT 359 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL. THIS STORM WAS LOCATED 18 MILES SOUTHEAST OF DOS RIOS...OR 12 MILES NORTHEAST OF WILLITS...AND MOVING NORTH AT 20 MPH. * THE SEVERE THUNDERSTORM WILL OTHERWISE REMAIN OVER MAINLY RURAL AREAS OF THE INDICATED COUNTY. PRECAUTIONARY/PREPAREDNESS ACTIONS... THIS IS A DANGEROUS STORM. IF YOU ARE IN ITS PATH...PREPARE IMMEDIATELY FOR DAMAGING WINDS...DESTRUCTIVE HAIL...AND DEADLY CLOUD TO GROUND LIGHTNING. PEOPLE OUTSIDE SHOULD MOVE TO A SHELTER... PREFERABLY INSIDE A STRONG BUILDING BUT AWAY FROM WINDOWS. && LAT...LON 3974 12338 3977 12307 3944 12310 3943 12324 TIME...MOT...LOC 2300Z 172DEG 16KT 3950 12317 $$ BK
1 follow-up statement
000 WWUS56 KEKA 032318 SVSEKA SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE EUREKA CA 418 PM PDT WED JUN 3 2009 CAC045-032327- /O.CAN.KEKA.SV.W.0011.000000T0000Z-090603T2330Z/ MENDOCINO CA- 418 PM PDT WED JUN 3 2009 ...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MENDOCINO COUNTY IS CANCELLED... THE THUNDERSTORM THAT PROMPTED THE WARNING HAS WEAKENED. THUNDERSTORM ACTIVITY WILL CONTINUE INTO THE EVENING HOURS. LAT...LON 3974 12338 3977 12307 3944 12310 3943 12324 TIME...MOT...LOC 2317Z 172DEG 16KT 3957 12318 $$ BK
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.
NWS Eureka, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 3, 2:09 PM PDT, 1 hour 51 minutes earlier.
Area forecast discussion, Jun 3, 2:09 PM PDT, 1 hour 51 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE EUREKA CA 210 PM PDT WED JUNE 03 2009 SYNOPSIS...AN AREA OF LOW PRESSURE ALONG THE WEST COAST WILL CONTINUE TO PRODUCE SHOWERS AND ISOLATED THUNDERSTORMS TO NORTHWEST CALIFORNIA THROUGH THE END OF THE WEEK. && .SHORT TERM...TONIGHT THROUGH SATURDAY...SATELLITE AND RADAR IMAGERY SHOW CONVECTION DEVELOPING THIS AFTERNOON. EXPECT SCT SHRA AND ISOLD TSTMS TO CONTINUE TO DEVELOP OVER THE REGION AND PROPAGATE TO THE NW ACROSS THE CWA AS QUASI STATIONARY UPPER LOW REMAINS OFF THE COAST. STABILITY INDICES SHOW SLIGHT POTENTIAL FOR LARGE HAIL AND DAMAGING WINDS WITH STORMS THIS AFTERNOON...SO WILL CONTINUE TO MONITOR RADAR TRENDS THROUGH THIS EVENING. EXPECT CONVECTION TO PEAK BY EARLY THIS EVENING AS A MINOR SHORT WAVE ROTATES AROUND THE PARENT LOW WITH SHOWERS CONTINUING THROUGH THE NIGHT IN THE UNSTABLE ATMOSPHERE. A SERIES OF VORT MAXES WILL ROTATE AROUND THE LOW AND COMBINE WITH A RELATIVELY DEEP MOIST LAYER TO CONTINUE THE THREAT OF CONVECTION THU. MODELS IN GOOD AGREEMENT ON UPPER LOW DRIFTING ONSHORE FRI WITH AFTERNOON CONVECTION EXPECTED AGAIN. THE THREAT FOR TSTMS WILL DIMINISH SAT AS THE UPPER LOW MOVES E OF THE REGION. BC && .LONG TERM (SATURDAY NIGHT THROUGH WEDNESDAY)...THE MEDIUM RANGE MODELS CONTINUE TO SHOW SOME CHANGES IN HOW THE UPPER LOW IS HANDLED THROUGH THE INITIAL PART OF THE EXTENDED. HOWEVER THE GENERAL IDEA OF MOVING THE LOW ONSHORE AND DEVELOPING SPLIT FLOW ALOFT IS MAINTAINED. THE LATEST ITERATION BRINGS THE LOW ONSHORE SOUTH OF POINT CONCEPTION EARLY SATURDAY EVENING...AND INLAND ACROSS LAS VEGAS BY 12Z SUNDAY. THE SOUTHERN BRANCH OF THE SPLIT FLOW PUSHES A LOW WEST TO THE OFFSHORE WATERS EARLY NEXT WEEK. NORTHERN CALIFORNIA WILL REMAIN IN LIGHT NORTHERLY FLOW WITH LINGERING MOISTURE THROUGH MONDAY...WITH A WEAK SHORTWAVE FORECAST BY THE GFS TO BRUSH THE CWA LATE MONDAY INTO TUESDAY...FOLLOWED BY A SIMILAR WEAK SYSTEM EARLY WEDNESDAY. CILIBERTI && .MARINE...LIGHT WINDS AND LOW SEAS WILL PREVAIL THROUGH THE WEEK. THE SEAS WILL CONTAIN A MIX OF SHORT PERIOD NW SWELL AND LONG PERIOD SOUTH TO SW SWELL...WITH SIG WAVE HEIGHTS NEAR 3 FEET. ISOLATED THUNDERSTORMS WILL PERSIST THROUGH FRIDAY...BRINGING OCCASIONAL CLOUD-TO-WATER LIGHTNING STRIKES...HEAVY RAIN...HAIL AND SUDDEN BURSTS OF WIND. && .AVIATION...CONTINUED ADVECTION OF MOIST AIR AND INSTABILITY...ASSOCIATED WITH A LOW PRESSURE SYSTEM CENTERED OFF THE CENTRAL COAST...WILL PRODUCE SHOWERS AND THE THREAT OF THUNDERSTORMS ACROSS THE REGION. THE STORMS MAY PRODUCE HAIL...HEAVY RAIN AS WELL AS STRONG AND ABRUPT WINDS. THESE ARE STANDARD FLIGHT HAZARDS ASSOCIATED WITH CONVECTION...AND ARE THE PRIMARY RISK TO AVIATION. AS TYPICAL...POCKETS OF IFR TO MVFR CONDITIONS WILL CONTINUE ALONG THE COASTAL STRIP. ASHFORD && .EKA WATCHES/WARNINGS/ADVISORIES... NONE. && VISIT US AT HTTP://WWW.WEATHER.GOV/EUREKA
Hazardous weather outlook, Jun 3, 5:18 AM PDT, 10 hours 42 minutes before
HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE EUREKA CA 518 AM PDT WED JUN 3 2009 CAZ001>004-076-041230- REDWOOD COAST-MENDOCINO COAST-NORTH COAST INTERIOR- UPPER TRINITY RIVER-MENDOCINO INTERIOR- 518 AM PDT WED JUN 3 2009 THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHWEST CALIFORNIA. .DAY ONE...TODAY AND TONIGHT THUNDERSTORM ACTIVITY WILL CONTINUE ACROSS NORTHWEST CALIFORNIA TODAY AND TONIGHT. STORMS WILL BE ACCOMPANIED BY LIGHTNING...HAIL ...GUSTY WINDS AND POTENTIALLY HEAVY RAIN. ALTHOUGH A MAJORITY OF THE STORMS ARE NOT EXPECTED TO BECOME SEVERE...THE THREAT OF ISOLATED STORMS CONTAINING DAMAGING WINDS OR HAIL IS POSSIBLE. .DAYS TWO THROUGH SEVEN...THURSDAY THROUGH TUESDAY THUNDERSTORM ACTIVITY WILL CONTINUE ACROSS NORTHWEST CALIFORNIA THROUGH THURSDAY. STORMS WILL BE ACCOMPANIED BY LIGHTNING...HAIL ...GUSTY WINDS AND POTENTIALLY HEAVY RAIN. ALTHOUGH A MAJORITY OF THE STORMS ARE NOT EXPECTED TO BECOME SEVERE...THE THREAT OF ISOLATED STORMS CONTAINING DAMAGING WINDS OR HAIL IS POSSIBLE. .SPOTTER INFORMATION STATEMENT... WEATHER SPOTTERS ARE ENCOURAGED TO REPORT SIGNIFICANT WEATHER CONDITIONS SUCH AS LIGHTNING...STRONG WINDS...HAIL OR FLOODING TO THEIR LOCAL NATIONAL WEATHER SERVICE OFFICE.
In the hours before
Special weather statement, Jun 3, 2:47 PM PDT, 1 hour 13 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE EUREKA CA 247 PM PDT WED JUN 3 2009 CAZ003-004-032230- TRINITY CA-HUMBOLDT CA- 247 PM PDT WED JUN 3 2009 THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A SIGNIFICANT WEATHER ADVISORY FOR... SOUTHEASTERN HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA SOUTHWESTERN TRINITY COUNTY IN NORTHWEST CALIFORNIA UNTIL 330 PM PDT AT 245 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM 6 MILES SOUTHEAST OF RUTH..MOVING NORTHWEST AT 10 MPH. HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT DANGEROUS LIGHTNING. LOCATIONS IMPACTED INCLUDE... RUTH... IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A STURDY BUILDING. LAT...LON 4035 12365 4050 12339 4020 12316 4009 12335 TIME...MOT...LOC 2147Z 145DEG 11KT 4022 12333 BC
Special weather statement, Jun 3, 3:04 PM PDT, 56 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
304 PM PDT WED JUN 3 2009
CAZ003-004-076-032300-
TRINITY CA-MENDOCINO CA-
304 PM PDT WED JUN 3 2009
THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
NORTHEASTERN MENDOCINO COUNTY IN NORTHWEST CALIFORNIA
SOUTH CENTRAL TRINITY COUNTY IN NORTHWEST CALIFORNIA
UNTIL 400 PM PDT
AT 303 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 11 MILES EAST OF COVELO..MOVING NORTH AT 15 MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.
LOCATIONS IMPACTED INCLUDE...
RURAL NORTHEASTERN MENDOCINO COUNTY...
RURAL SOUTHERN TRINITY COUNTY...
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
LAT...LON 3967 12312 4001 12329 4008 12298 3987 12293
3984 12294 3982 12293 3975 12292 3975 12291
3972 12290
TIME...MOT...LOC 2204Z 165DEG 12KT 3978 12304
BCSpecial weather statement, Jun 3, 3:51 PM PDT, 9 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE EUREKA CA
351 PM PDT WED JUN 3 2009
CAZ003-032330-
HUMBOLDT CA-
351 PM PDT WED JUN 3 2009
THE NATIONAL WEATHER SERVICE IN EUREKA HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
CENTRAL HUMBOLDT COUNTY IN NORTHWEST CALIFORNIA
UNTIL 430 PM PDT
AT 350 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 12 MILES NORTH OF DINSMORE..MOVING NORTHWEST AT
10 MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 50 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH HEAVY RAIN AND FREQUENT
DANGEROUS LIGHTNING.
LOCATIONS IMPACTED INCLUDE...
RURAL CENTRAL HUMBOLDT COUNTY...
IF THREATENING WEATHER APPROACHES YOUR AREA...TAKE SHELTER IN A
STURDY BUILDING.
LAT...LON 4064 12394 4081 12380 4068 12362 4059 12358
4056 12361
TIME...MOT...LOC 2251Z 126DEG 11KT 4064 12368
BCThe office that day
Everything else NWS Eureka, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 2, 6:15 PM PDT | Special Weather Statement | EKA | Mendocino | 45 min |
| Jun 2, 6:32 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino | 28 min |
| Jun 2, 7:15 PM PDT | Special Weather Statement | EKA | Siskiyou | 45 min |
| Jun 3, 2:43 PM PDT | Areal Flood Advisory | EKA | Mendocino | 3 hr |
| Jun 3, 2:47 PM PDT | Special Weather Statement | EKA | Trinity | 43 min |
| Jun 3, 3:04 PM PDT | Special Weather Statement | EKA | 56 min | |
| Jun 3, 3:21 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 24 min |
| Jun 3, 3:28 PM PDT | Severe Thunderstorm Warning | EKA | Mendocino, Trinity | 32 min |
| Jun 3, 3:44 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 46 min |
| Jun 3, 3:51 PM PDT | Special Weather Statement | EKA | Humboldt | 39 min |
| Jun 3, 4:05 PM PDT | Severe Thunderstorm Warning | EKA | Trinity | 25 min |
| Jun 3, 4:20 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt | 25 min |
| Jun 3, 4:26 PM PDT | Special Weather Statement | EKA | Humboldt | 19 min |
| Jun 3, 4:36 PM PDT | Special Weather Statement | EKA | Mendocino | 24 min |
| Jun 3, 4:42 PM PDT | Special Weather Statement | EKA | Mendocino | 33 min |
| Jun 3, 4:47 PM PDT | Severe Thunderstorm Warning | EKA | Humboldt, Trinity | 13 min |
Nearby
Severe Thunderstorm Warnings in California, 2009Every severe thunderstorm warning in 2009
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.