Alert archive / California / Tornado Warnings in 2015
Tornado Warning 2, NWS Sacramento, CA
NWS Sacramento, CA issued this tornado warning at Apr 7, 2015, 3:54 PM PDT for Butte County, California. It was in force for 49 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
- Apr 7, 2015, 3:54 PM PDT (22:54 UTC)
- Expired
- Apr 7, 2015, 4:43 PM PDT
- In force
- 49 min
- Issued by
- NWS Sacramento, CA
- Area
- Storm-based polygon
County Butte County, CA
The radar
The Beale AFB radar (KBBX), 15 km from the middle of the area, began a volume at 22:56 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 |
|---|---|---|---|
| Apr 7, 3:55 PM PDT | HAIL 0.25 | 5 Wnw Thermalito, CA | PEA SIZE HAIL UP TO 2 INCHES DEEP ON HIGHWAY 99 JUST WEST OF OROVILLE. NWS SPOTTER REPORTS TRAFFIC SLOWED TO A CRAWL WITH A FEW CARS SPUN OFF ROADWAY FROM HAIL ACCUMULATION HAIL DURATION 30 MINUTES. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Oakland, CA (KOAK), launched 12:00Z, 10.9 hours before the alert went out and 214 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
- 8 J/kg
- Mixed-layer CIN
- -9 J/kg
- Mixed-layer LCL
- 628 m above ground
- 0-6 km bulk shear
- 50 kt
- 0-1 km storm-relative helicity
- 167 m²/s²
- 0-3 km storm-relative helicity
- 165 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
293 WFUS56 KSTO 072254 TORSTO CAC007-080000- /O.NEW.KSTO.TO.W.0002.150407T2254Z-150408T0000Z/ BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE SACRAMENTO CA 354 PM PDT TUE APR 7 2015 THE NATIONAL WEATHER SERVICE IN SACRAMENTO HAS ISSUED A * TORNADO WARNING FOR... CENTRAL BUTTE COUNTY IN NORTHERN CALIFORNIA... * UNTIL 500 PM PDT * AT 350 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF PRODUCING A TORNADO NEAR THERMALITO...OR 6 MILES WEST OF OROVILLE...MOVING NORTH AT 15 MPH. THIS THUNDERSTORM IS LIKELY PRODUCING ACCUMULATING HAIL. * THE TORNADO WILL BE NEAR... RURAL CENTRAL BUTTE COUNTY AT 410 PM PDT. THIS STORM WILL PASS OVER HIGHWAY 99 IN THE NEXT 30 MINUTES. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW! MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME OR OUTDOORS... MOVE TO THE CLOSEST SUBSTANTIAL BUILDING. IF IN A VEHICLE IN THE PATH OF A TORNADO...LEAVE THE CAR AND GO TO A STURDY STRUCTURE. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR LOW SPOT AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 3973 12180 3973 12157 3946 12158 3945 12179 TIME...MOT...LOC 2253Z 179DEG 13KT 3951 12168 $$ DANG
2 follow-up statements
158 WWUS56 KSTO 072331 SVSSTO SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 431 PM PDT TUE APR 7 2015 CAC007-080000- /O.CON.KSTO.TO.W.0002.000000T0000Z-150408T0000Z/ BUTTE CA- 431 PM PDT TUE APR 7 2015 ...A TORNADO WARNING REMAINS IN EFFECT UNTIL 500 PM PDT FOR CENTRAL BUTTE COUNTY... AT 428 PM PDT...NATIONAL WEATHER SERVICE DOPPLER RADAR CONTINUED TO INDICATE A TORNADO. THIS TORNADO WAS LOCATED 11 MILES NORTH OF THERMALITO...OR 9 MILES SOUTHWEST OF PARADISE...MOVING NORTH AT 15 MPH. THE TORNADO WILL BE NEAR... RURAL CENTRAL BUTTE COUNTY AT 440 PM PDT...JUST NORTH OF HIGHWAY 99. PRECAUTIONARY/PREPAREDNESS ACTIONS... TAKE COVER NOW! MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF A STURDY BUILDING. AVOID WINDOWS. IF IN A MOBILE HOME OR OUTDOORS... MOVE TO THE CLOSEST SUBSTANTIAL BUILDING. IF IN A VEHICLE IN THE PATH OF A TORNADO...LEAVE THE CAR AND GO TO A STURDY STRUCTURE. IF NO SHELTER IS AVAILABLE...LIE FLAT IN THE NEAREST DITCH OR LOW SPOT AND PROTECT YOURSELF FROM FLYING DEBRIS. && LAT...LON 3973 12180 3973 12157 3946 12158 3945 12179 TIME...MOT...LOC 2330Z 179DEG 13KT 3964 12168 $$ DANG
284 WWUS56 KSTO 072343 SVSSTO SEVERE WEATHER STATEMENT NATIONAL WEATHER SERVICE SACRAMENTO CA 443 PM PDT TUE APR 7 2015 CAC007-072353- /O.CAN.KSTO.TO.W.0002.000000T0000Z-150408T0000Z/ BUTTE CA- 443 PM PDT TUE APR 7 2015 ...THE TORNADO WARNING FOR CENTRAL BUTTE COUNTY IS CANCELLED... LAT...LON 3973 12180 3973 12157 3946 12158 3945 12179 TIME...MOT...LOC 2343Z 179DEG 13KT 3969 12168 $$
The office that day
Everything else NWS Sacramento, CA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 7, 10:48 AM PDT | Special Weather Statement | STO | Solano | 42 min |
| Apr 7, 12:07 PM PDT | Special Weather Statement | STO | San Joaquin | 53 min |
| Apr 7, 12:58 PM PDT | Severe Thunderstorm Warning | STO | Amador, Calaveras, Sacramento, San Joaquin | 58 min |
| Apr 7, 1:56 PM PDT | Special Weather Statement | STO | Glenn | 64 min |
| Apr 7, 2:00 PM PDT | Severe Thunderstorm Warning | STO | Placer, Sacramento, Sutter, Yolo | 26 min |
| Apr 7, 2:25 PM PDT | Severe Thunderstorm Warning | STO | El Dorado, Placer, Sacramento, Sutter, Yolo | 65 min |
| Apr 7, 2:30 PM PDT | Severe Thunderstorm Warning | STO | Glenn, Tehama | 45 min |
| Apr 7, 2:41 PM PDT | Special Weather Statement | STO | Stanislaus | 64 min |
| Apr 7, 3:13 PM PDT | Tornado Warning | STO | Glenn | 22 min |
| Apr 7, 3:25 PM PDT | Special Weather Statement | STO | Amador | 50 min |
| Apr 7, 3:32 PM PDT | Special Weather Statement | STO | Yuba | 58 min |
| Apr 7, 3:33 PM PDT | Special Weather Statement | STO | Calaveras | 57 min |
| Apr 7, 4:00 PM PDT | Tornado Warning | STO | Butte | 43 min |
| Apr 7, 4:29 PM PDT | Special Weather Statement | STO | Sacramento | 46 min |
Nearby
Tornado Warnings in California, 2015Every tornado warning in 2015Tornadoes in 2015
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.