Alert archive / California / Severe Thunderstorm Warnings in 2014
Severe Thunderstorm Warning 7, NWS Sacramento, CA
NWS Sacramento, CA issued this severe thunderstorm warning at Aug 11, 2014, 2:17 PM PDT for Shasta County, California. It was in force for 43 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
- Aug 11, 2014, 2:17 PM PDT (21:17 UTC)
- Expired
- Aug 11, 2014, 3:00 PM PDT
- In force
- 43 min
- Issued by
- NWS Sacramento, CA
- Area
- Storm-based polygon
County Shasta County, CA
The radar
The Beale AFB radar (KBBX), 147 km from the middle of the area, began a volume at 21:17 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 |
|---|---|---|---|
| Aug 11, 2:30 PM PDT | HAIL 1 | 5 Sse Cassel, CA | A TRAINED SPOTTER REPORTED QUARTER-SIZE HAIL NEAR BURNEY. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
Did it verify
Verified. The Iowa Environmental Mesonet's Cow matched one storm report to this severe thunderstorm warning; the first came 13 minutes after it went out.
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
Medford/Jackson, OR (KMFR), launched 12:00Z, 9.3 hours before the alert went out and 208 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
- 2730 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 31 m²/s²
- 0-3 km storm-relative helicity
- 11 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
920 WUUS56 KSTO 112117 SVRSTO CAC089-112200- /O.NEW.KSTO.SV.W.0007.140811T2117Z-140811T2200Z/ BULLETIN - EAS ACTIVATION REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SACRAMENTO CA 217 PM PDT MON AUG 11 2014 THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A * SEVERE THUNDERSTORM WARNING FOR... EAST CENTRAL SHASTA COUNTY IN NORTHERN CALIFORNIA... * UNTIL 300 PM PDT * AT 212 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 17 MILES SOUTHEAST OF CASSEL...OR 28 MILES SOUTH OF NUBIEBER...AND MOVING NORTH AT 15 MPH. * THE SEVERE THUNDERSTORM WILL BE NEAR... 8 MILES EAST OF CASSEL BY 300 PM PDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO HAIL AND POTENTIALLY DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! WHEN THUNDER ROARS...GO INDOORS. && LAT...LON 4067 12133 4072 12154 4100 12155 4099 12133 TIME...MOT...LOC 2117Z 175DEG 14KT 4073 12138 $$ SHOEMAKER
1 follow-up statement
711 WWUS56 KSTO 112137 SVSSTO SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 237 PM PDT MON AUG 11 2014 CAC089-112200- /O.CON.KSTO.SV.W.0007.000000T0000Z-140811T2200Z/ SHASTA CA- 237 PM PDT MON AUG 11 2014 ...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM PDT FOR EAST CENTRAL SHASTA COUNTY... AT 230 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A SEVERE THUNDERSTORM CAPABLE OF PRODUCING QUARTER SIZE HAIL...AND DAMAGING WINDS IN EXCESS OF 60 MPH. THIS STORM WAS LOCATED 7 MILES SOUTHEAST OF BURNEY MOVING NORTH AT 15 MPH. THE SEVERE THUNDERSTORM WILL BE NEAR... CASSEL BY 255 PM PDT... PRECAUTIONARY/PREPAREDNESS ACTIONS... IN ADDITION TO HAIL AND POTENTIALLY DAMAGING WINDS...FREQUENT CLOUD TO GROUND LIGHTNING IS OCCURRING WITH THIS STORM. MOVE INDOORS IMMEDIATELY! WHEN THUNDER ROARS...GO INDOORS. && LAT...LON 4067 12133 4072 12154 4100 12155 4099 12133 TIME...MOT...LOC 2135Z 143DEG 12KT 4084 12152 $$ CS
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 Sacramento, CA wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 11, 10:26 AM PDT, 3 hours 51 minutes earlier.
Area forecast discussion, Aug 11, 10:26 AM PDT, 3 hours 51 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE SACRAMENTO CA 1026 AM PDT Mon Aug 11 2014 .Synopsis... Thunderstorms are possible over the mountains today, and potentially more widespread thunderstorms later today into early Tuesday including valley locations. Temperatures to remain near normal through the week. && .Discussion... Increasing mid-level moisture evident on preciptable water satellite this morning with alto-cumulus increasing over the area. Isolated showers have already developed over the Sierra and this is where the afternoon focus will be...along with Shasta county. Have expanded slight thunderstorm chances westward over the eastern San Joaquin valley for this afternoon and increased overnight/Tuesday morning valley pops area-wide. .Previous Discussion... The closed low off the coast has retrograded slightly over the past 24 hours and is now centered about 225 mi W of KSFO. NorCal is presently between waves with some lighter showers exiting NE CA while lots of thunderstorm activity has recently broken out with the next wave moving from the southern Sierra up into NV. Temperatures early this morning are running a few degrees milder than 24 hours ago and generally range from the 60s into the lower 70s except for mid to upper 40s in some of the cooler mountain valleys. Still looking like thunderstorms will increase over the northern Sierra and northern mountains today and then potentially spread into the northern Sacramento Valley late in the day. A better chance for more widespread deep convection is expected tonight and early Tuesday as the offshore low opens-up and moves inland. The forecast track has been trending a little further to the north with recent model runs which now take it north of I-80, so the main thunderstorm threat for the Central Valley will be north of Sacramento. Initial system moves quickly east by midday Tuesday taking remaining moisture/instability with it as the next one approaches from the Gulf of Alaska. A little cooler and breezier conditions can be expected across NorCal Wednesday as this system passes to our north, but it's looking like precip chances will remain up near the OR border. Dry and milder weather returns for the remainder of the week with temperatures forecast to be around normal for mid-August. && .Extended Discussion (Friday through Monday) Medium range models showing upper low slowly moving through the PacNW Wednesday/Thursday with associated troughing extending southward into NorCal. Main impact for the CWA will be some synoptic cooling with high temperatures 5 to 10 degrees below normal. Models in better agreement with keeping weak zonal flow over the area Friday then increasing upper troughing through the weekend. Pattern suggests dry weather with temperatures warming slightly Friday, but continued slightly below normal through the weekend. && .Aviation... General VFR conditions expected at TAF sites for next 24 hrs. However, an upper low near the Central CA coastline will bring a chance of showers/thunderstorms this afternoon into Tuesday. Periods of MVFR/IFR conditions likely to occur in showers/thunderstorms. Also, expect localized MVFR/IFR due to smoke and haze near wildfires. Surface winds in the valley will generally be 5-10 kts. South to Southeasterly flow over ridge tops at 25 kts. JBB && .STO Watches/Warnings/Advisories... red flag warning until 11 am pdt tuesday burney basin / eastern shasta county...motherlode...mountains southwestern shasta county to northern lake county...northeast foothills/sacramento valley...shasta lake area / northern shasta county...west slope northern sierra nevada...western plumas county/lassen park. fire weather watch from 5 pm pdt this afternoon through tuesday morning carquinez strait and delta...central sacramento valley... clear lake/southern lake county...mountains southwestern shasta county to northern lake county...northern sacramento valley... northern san joaquin valley...southern sacramento valley. &&
In the hours before
Local storm report, Aug 11, 1:36 PM PDT, 41 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
136 PM PDT MON AUG 11 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0230 PM HAIL 9 NW OLD STATION 40.75N 121.56W
08/10/2014 M1.00 INCH SHASTA CA FIRE DEPT/RESCUE
QUARTER-SIZE HAIL WAS REPORTED ON THE SE
FLANK OF THE EILER FIRE YESTERDAY AT 2:30PM.
&&
NWS SACRAMENTO CA
IRIS SYSTEMLocal storm report, Aug 11, 1:37 PM PDT, 40 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
137 PM PDT MON AUG 11 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0115 PM HAIL 6 SE BURNEY 40.83N 121.58W
08/11/2014 E0.50 INCH SHASTA CA FIRE DEPT/RESCUE
SLIGHTLY LARGER THAN PEA-SIZE HAIL WAS
REPORTED ON THE NE FLANK OF THE EILER FIRE.
&&
NWS SACRAMENTO CA
IRIS SYSTEMSpecial weather statement, Aug 11, 2:02 PM PDT, 15 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SACRAMENTO CA
202 PM PDT MON AUG 11 2014
CAZ013-014-066-068-112145-
BURNEY BASIN / EASTERN SHASTA COUNTY CA-NORTHEAST
FOOTHILLS/SACRAMENTO VALLEY CA-SHASTA LAKE AREA / NORTHERN SHASTA
COUNTY CA-WESTERN PLUMAS COUNTY/LASSEN PARK CA-
202 PM PDT MON AUG 11 2014
THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A
SIGNIFICANT WEATHER ADVISORY FOR...
CENTRAL SHASTA COUNTY IN NORTHERN CALIFORNIA
UNTIL 245 PM PDT
AT 200 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
STRONG THUNDERSTORM 7 MILES EAST OF HILLCREST..MOVING NORTHWEST AT 20
MPH.
HAIL UP TO ONE-HALF INCH IN DIAMETER AND WIND GUSTS UP TO 40 MPH ARE
EXPECTED WITH THIS STORM...ALONG WITH FREQUENT DANGEROUS LIGHTNING.
LOCATIONS IMPACTED INCLUDE...
HILLCREST... MONTGOMERY CREEK AND ROUND MOUNTAIN...
BIG BEND...
LAT...LON 4104 12196 4096 12156 4082 12158 4077 12167
4076 12202
TIME...MOT...LOC 2102Z 114DEG 20KT 4087 12179
SHOEMAKERLocal storm report, Aug 11, 2:03 PM PDT, 14 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
203 PM PDT MON AUG 11 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0202 PM HAIL 1 SSE BURNEY 40.87N 121.66W
08/11/2014 M0.25 INCH SHASTA CA TRAINED SPOTTER
A TRAINED SPOTTER REPORTED PEA SIZE HAIL IN
BURNEY.
&&
NWS SACRAMENTO CA
IRIS SYSTEMLocal storm report, Aug 11, 2:07 PM PDT, 10 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
207 PM PDT MON AUG 11 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0205 PM HAIL 1 SSE BURNEY 40.87N 121.66W
08/11/2014 M1.00 INCH SHASTA CA TRAINED SPOTTER
TRAINED SPOTTER HAS REPORTED QUARTER-SIZE
HAIL IN BURNEY.
&&
NWS SACRAMENTO CA
IRIS SYSTEMLocal storm report, Aug 11, 2:08 PM PDT, 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SACRAMENTO CA
208 PM PDT MON AUG 11 2014
...TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
...DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0208 PM HAIL 1 ESE BURNEY 40.88N 121.65W
08/11/2014 M0.75 INCH SHASTA CA TRAINED SPOTTER
TRAINED SPOTTER IN BURNEY HAS REPORTED
PENNY-SIZE HAIL.
&&
NWS SACRAMENTO CA
IRIS SYSTEMThe office that day
Everything else NWS Sacramento, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 11, 11:37 AM PDT | Special Weather Statement | STO | El Dorado, Nevada, Placer | 53 min |
| Aug 11, 12:33 PM PDT | Special Weather Statement | STO | Nevada | 42 min |
| Aug 11, 12:45 PM PDT | Special Weather Statement | STO | 45 min | |
| Aug 11, 1:15 PM PDT | Special Weather Statement | STO | Sierra | 45 min |
| Aug 11, 2:02 PM PDT | Special Weather Statement | STO | Shasta | 43 min |
| Aug 11, 2:07 PM PDT | Severe Thunderstorm Warning | STO | Shasta | 53 min |
| Aug 11, 2:59 PM PDT | Severe Thunderstorm Warning | STO | Shasta | 46 min |
| Aug 11, 3:53 PM PDT | Severe Thunderstorm Warning | STO | Sierra | 39 min |
| Aug 11, 4:44 PM PDT | Severe Thunderstorm Warning | STO | Nevada, Placer, Sierra | 61 min |
Nearby
Severe Thunderstorm Warnings in California, 2014Every severe thunderstorm warning in 2014
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.