Alert archive / California / Special Weather Statements in 2017

Special Weather Statement, NWS Phoenix, AZ

August 2, 2017Imperial County, California

NWS Phoenix, AZ issued this special weather statement at Aug 2, 2017, 4:21 PM PDT for Imperial County, California. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 2, 2017, 4:21 PM PDT (23:21 UTC)
Expired: Aug 2, 2017, 4:45 PM PDT
In force: 24 min
Issued by: NWS Phoenix, AZ

County Imperial County, CA

The radar

The Yuma radar (KYUX), 48 km from the middle of the area, began a volume at 23:23 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

Yuma Prvg Ground, AZ (K1Y7), launched 12:00Z, 11.4 hours before the alert went out and 68 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: 287 J/kg
Mixed-layer CIN: -216 J/kg
Mixed-layer LCL: 1983 m above ground
0-6 km bulk shear: 4 kt
0-1 km storm-relative helicity: -5 m²/s²
0-3 km storm-relative helicity: 11 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

520 
WWUS85 KPSR 022321
SPSPSR

Special Weather Statement
National Weather Service Phoenix AZ
421 PM PDT WED AUG 2 2017
 
CAZ565-022345-
Imperial County Southeast CA-
421 PM PDT WED AUG 2 2017

...SIGNIFICANT WEATHER ADVISORY FOR SOUTH CENTRAL IMPERIAL COUNTY
UNTIL 445 PM PDT...

At 420 PM PDT, Doppler radar was tracking a strong thunderstorm near
Gordon's Well, or 18 miles northwest of Gadsden. This storm was
nearly stationary.

Winds in excess of 40 mph will be possible with this storm.

Locations impacted include...
Gordon's Well.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Torrential rainfall is also occurring with this storm, and may lead
to localized flooding. Do not drive your vehicle through flooded
roadways.

Frequent cloud to ground lightning is occurring with this storm.
Lightning can strike 10 miles away from a thunderstorm. Seek a safe
shelter inside a building or vehicle.

&&

LAT...LON 3277 11519 3291 11504 3277 11488 3270 11496
      3270 11504
TIME...MOT...LOC 2320Z 115DEG 3KT 3274 11500 

$$

Hernandez

The office that day

Everything else NWS Phoenix, AZ issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 1, 5:05 PM PDT	Blowing Dust Advisory	PSR	La Paz, Maricopa, Pinal	3 hr
Aug 1, 5:20 PM PDT	Special Weather Statement	PSR		40 min
Aug 1, 5:26 PM PDT	Areal Flood Advisory	PSR	Maricopa, Pinal	3 hr
Aug 1, 5:45 PM PDT	Severe Thunderstorm Warning	PSR	Maricopa	30 min
Aug 1, 6:20 PM PDT	Special Weather Statement	PSR		40 min
Aug 1, 6:26 PM PDT	Areal Flood Advisory	PSR	Maricopa	3 hr
Aug 1, 6:48 PM PDT	Flash Flood Warning	PSR	Maricopa	3 hr
Aug 1, 7:41 PM PDT	Special Weather Statement	PSR	La Paz	49 min
Aug 1, 8:02 PM PDT	Special Weather Statement	PSR		43 min
Aug 2, 2:39 PM PDT	Areal Flood Advisory	PSR	La Paz	3 hr
Aug 2, 4:41 PM PDT	Special Weather Statement	PSR		34 min
Aug 2, 4:42 PM PDT	Special Weather Statement	PSR	Yuma	48 min
Aug 2, 2:53 PM PDT	Special Weather Statement	PSR	Imperial	52 min
Aug 2, 3:06 PM PDT	Special Weather Statement	PSR	Imperial	24 min
Aug 2, 3:28 PM PDT	Areal Flood Advisory	PSR	Imperial	3 hr
Aug 2, 3:38 PM PDT	Special Weather Statement	PSR	Imperial	52 min
Aug 2, 3:43 PM PDT	Areal Flood Advisory	PSR	Imperial	2 hr
Aug 2, 4:00 PM PDT	Special Weather Statement	PSR	Riverside	45 min
Aug 2, 4:13 PM PDT	Flash Flood Warning	PSR	Imperial	3 hr

Nearby

Special Weather Statements in California, 2017 Every special weather statement in 2017

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.