Severe Thunderstorm Warning 15, NWS San Diego, CA

507 
WWUS56 KSGX 022326
SVSSGX

Severe Weather Statement
National Weather Service San Diego CA
426 PM PDT WED AUG 2 2017

CAC073-022345-
/O.CON.KSGX.SV.W.0015.000000T0000Z-170802T2345Z/
San Diego CA-
426 PM PDT WED AUG 2 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM PDT
FOR SOUTHEASTERN SAN DIEGO COUNTY...

At 424 PM PDT, a severe thunderstorm was located near I-8 Between
Pine Valley And Boulevard, and was nearly stationary.

HAZARD...60 mph wind gusts and penny size hail. 

SOURCE...Radar indicated. 

IMPACT...Damage possible to cars, power lines and trees. 

Locations impacted include...
I-8 Between Pine Valley And Boulevard, Boulevard, Lake Morena, Pine
Valley, Campo, Campo Indian Reservation, La Posta Indian Reservation,
Live Oak Springs and Manzanita Indian Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3282 11654 3285 11638 3266 11629 3263 11648
TIME...MOT...LOC 2324Z 322DEG 1KT 3274 11642 

HAIL...0.75IN
WIND...60MPH
 
$$

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365 
WWUS56 KSGX 022339
SVSSGX

Severe Weather Statement
National Weather Service San Diego CA
439 PM PDT WED AUG 2 2017

CAC073-022349-
/O.EXP.KSGX.SV.W.0015.000000T0000Z-170802T2345Z/
San Diego CA-
439 PM PDT WED AUG 2 2017

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN SAN DIEGO COUNTY
WILL EXPIRE AT 445 PM PDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore the warning will be allowed to expire.

LAT...LON 3282 11654 3285 11638 3266 11629 3263 11648
TIME...MOT...LOC 2339Z 322DEG 1KT 3274 11642 

$$

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Area Forecast Discussion
National Weather Service San Diego CA
232 PM PDT Wed Aug 2 2017

...Threat of Flash Flood-Producing Thunderstorms Continues
Through Thursday Evening Across the Interior...

.SYNOPSIS...
Deep monsoonal moisture and disturbances aloft will keep a threat
of flash-flood producing thunderstorms over the interior through
Thursday evening. Moisture will decrease on Friday from the west
with only isolated thunderstorms possible over the mountains and
deserts. Drier air will move in for the weekend and continue into
at least early next week, shutting down monsoonal thunderstorm
activity for several days. Temperatures will be seasonably hot
inland and relatively mild along the coast.

&&

.DISCUSSION...FOR EXTREME SOUTHWESTERN CALIFORNIA INCLUDING ORANGE...
SAN DIEGO...WESTERN RIVERSIDE AND SOUTHWESTERN SAN BERNARDINO
COUNTIES...

Spinning upper low seen in water vapor imagery off the Southern
California coast. Another upper wave is moving in from the
Southeast. Tropical moisture is fully entrenched over the area.
SPC mesoanalysis shows high Precipitable Water across our service
area, ranging from 1.7-1.9" northern sections to 2.0-2.2" across
Orange, southern Riverside, and San Diego Counties.

Intense thunderstorms have developed over parts of the area,
prompting the issuance of severe thunderstorm warnings. The
strongest cells have affected northern rural San Diego County into
southern Riverside County. Wind threat exists today, and some hail,
but by far the primary concern is for life-threatening flash
flooding. Flash flooding has been reported at Aguanda in Riverside
County at SR79/sr371 with vehicles stranded with rocks and debris
across the road per law enforcement.

The threat of thunderstorms continues everywhere through early
evening, but the focus will be near and over the mountains.
Tstorms could develop and/or move to the deserts. Flow on Thursday
gradually becomes westerly in the mid levels by late afternoon.
This should allow for the deserts to become even more susceptible
to thunderstorms/flash flooding. Have extended the Flash Flood
Watch for the mountains, deserts, Inland Empire, and the far
inland valleys of San Diego County through Thursday evening. The
deep moisture will remain over these areas with dry air moving
into coastal locales late. The flow tomorrow likely will keep the
coast dry.

After Thursday, dry air sweeps in on westerly flow. Friday could
see just a thunderstorm or two over the mountains/deserts in the
residual moisture. And that could be the final day of monsoonal
thunderstorm activity potentially through next week. Global models
show a weak trough developing along the U.S. West Coast next
week. This would keep westerly flow and monsoonal moisture away
from California with dry conditions and seasonal temperatures.

&&

.AVIATION...
022030Z...Scattered thunderstorms with heavy rain and sfc wind gusts
40-50 kt through 04Z. Bases 030-050 and TOPS 500. BKN080-120
elsewhere.

Tonight: Low clouds BKN-OVC010-015 may briefly impact KSAN
between 11-15Z Thursday.

Thursday: Scattered afternoon and evening thunderstorms over the
mountains, foothills and deserts.

&&

.MARINE...
A chance of showers and thunderstorms through this evening. A Marine
Weather Statement remains in effect through 11 PM today. No
hazardous weather Thursday through Sunday.

&&

.BEACHES...
Isolated thunderstorms possible at the beaches through this evening.

&&

.SKYWARN...
Skywarn activation is requested for all of Southern California
through early this evening. Concerns are high rainfall rates
leading to flash flooding along with strong downburst winds. All
spotters are requested to submit any severe weather or flooding
reports to the NWS.

&&

.SGX WATCHES/WARNINGS/ADVISORIES...
CA...Flash Flood Watch through Thursday evening for Apple and Lucerne
     Valleys-Coachella Valley-Riverside County Mountains-San
     Bernardino County Mountains-San Bernardino and Riverside
     County Valleys-The Inland Empire-San Diego County Deserts-
     San Diego County Mountains-San Diego County Valleys-San
     Gorgonio Pass Near Banning.

     Flash Flood Watch until 10 PM PDT this evening for Orange County
     Inland Areas-Santa Ana Mountains and Foothills.

PZ...NONE.
&&

PUBLIC...Gregoria
AVIATION/MARINE...Moede

Special Weather Statement
National Weather Service San Diego CA
1242 PM PDT WED AUG 2 2017

CAZ048-050-056-058-022015-
San Diego County Mountains CA-Riverside County Mountains CA-
San Bernardino and Riverside County Valleys-The Inland Empire CA-
San Diego County Inland Valleys CA-
1242 PM PDT WED AUG 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR RIVERSIDE AND NORTH CENTRAL SAN
DIEGO COUNTIES UNTIL 115 PM PDT...

At 1241 PM PDT, Doppler radar was tracking a strong thunderstorm near
Aguanga, or 13 miles east of Temecula, moving northwest at 15 mph.

Wind gusts up to 50 mph will be possible with this storm, along with
very heavy rainfall.

Locations impacted include...
Temecula,Aguanga, Palomar Mountain, Hwy 79 Between Oak Grove And
Aguanga, Palomar Mountain State Park, Hwy 79 Between Warner Springs
And Oak Grove, S7 - East Grade Rd, Pechanga Indian Reservation, Oak
Grove and Sage.

LAT...LON 3341 11664 3328 11684 3343 11722 3356 11711
      3370 11693
TIME...MOT...LOC 1941Z 120DEG 14KT 3343 11692

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PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE SAN DIEGO CA
132 PM PDT WED AUG 2 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0121 PM     FLASH FLOOD      AGUANGA                 33.44N 116.86W
08/02/2017                   RIVERSIDE          CA   LAW ENFORCEMENT

            ROADWAY FLOODED AT SR79/SR371, VEHICLES
            GETTING STUCK AND ROCKS AND DEBRIS ON THE
            ROAD.

&&

PRELIMINARY LOCAL STORM REPORT...CORRECTED
NATIONAL WEATHER SERVICE SAN DIEGO CA
248 PM PDT WED AUG 2 2017

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0121 PM     FLASH FLOOD      AGUANGA                 33.44N 116.86W
08/02/2017                   RIVERSIDE          CA   LAW ENFORCEMENT

            ROADWAY FLOODED AT SR79/SR371, VEHICLES
            GETTING STUCK IN ROCKS AND DEBRIS ON THE
            ROAD. CHP SHUT DOWN ROADWAY AT 2:24 PM.

&&

Special Weather Statement
National Weather Service San Diego CA
253 PM PDT WED AUG 2 2017

CAZ050-058-022230-
San Diego County Mountains CA-San Diego County Inland Valleys CA-
253 PM PDT WED AUG 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR CENTRAL SAN DIEGO COUNTY UNTIL
330 PM PDT...

At 251 PM PDT, Doppler radar was tracking a strong thunderstorm near
Santa Ysabel, the storm was nearly stationary.

Dime size hail and wind gusts up to 50 mph will be possible with this
storm.

Locations impacted include...
Julian, Cuyamaca Rancho State Park, Hwy 78 Between Ramona And Santa
Ysabel, Hwy 79 Between Julian And Lake Cuyamaca, San Diego Country
Estates, Lake Cuyamaca, Hwy 79 Between Santa Ysabel And Warner
Springs, Wynola, Santa Ysabel, Santa Ysabel Indian Reservation,
Banner and Boulder Creek.

LAT...LON 3320 11669 3307 11656 3298 11658 3294 11674
      3315 11686
TIME...MOT...LOC 2151Z 100DEG 48KT 3316 11743

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Special Weather Statement
National Weather Service San Diego CA
325 PM PDT WED AUG 2 2017

CAZ058-062-022300-
San Diego County Mountains CA-San Diego County Deserts CA-
325 PM PDT WED AUG 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SAN DIEGO COUNTY
UNTIL 400 PM PDT...

At 324 PM PDT, Doppler radar was tracking a strong thunderstorm near
Mount Laguna and Pine Valley, the storm was nearly stationary.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
Mount Laguna, I-8 Between Pine Valley And Boulevard, Cuyamaca Rancho
State Park, Hwy S2 Between Shelter Valley And Agua Caliente, Hwy S1
Between Lake Cuyamaca And Mount Laguna, Pine Valley, Lake Cuyamaca,
Manzanita Indian Reservation and La Posta Indian Reservation.

LAT...LON 3298 11657 3304 11647 3297 11639 3279 11630
      3274 11636 3273 11648
TIME...MOT...LOC 2224Z 345DEG 5KT 3286 11643

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Special Weather Statement
National Weather Service San Diego CA
350 PM PDT WED AUG 2 2017

CAZ058-062-022330-
San Diego County Mountains CA-San Diego County Deserts CA-
350 PM PDT WED AUG 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTHEASTERN SAN DIEGO COUNTY
UNTIL 430 PM PDT...

At 347 PM PDT, Doppler radar was tracking a strong thunderstorm over
Interstate 8 between Pine Valley and Boulevard. This storm was
nearly stationary.

Half inch hail and winds in excess of 40 mph will be possible with
this storm.

Locations impacted include...
I-8 Between Pine Valley And Boulevard, I-8 Between Boulevard And
Imperial County Line, Boulevard, Campo, Tierra Del Sol, Campo Indian
Reservation, La Posta Indian Reservation, Live Oak Springs, Manzanita
Indian Reservation and Jacumba.

LAT...LON 3273 11648 3274 11636 3279 11630 3261 11622
      3260 11632 3259 11645
TIME...MOT...LOC 2247Z 322DEG 1KT 3270 11637

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