Alert archive / Arizona / Severe Thunderstorm Warnings in 1987

Severe Thunderstorm Warning 13, NWS Phoenix, AZ

October 29, 1987Gila County, Yavapai County, Arizona

NWS Phoenix, AZ issued this severe thunderstorm warning at Oct 29, 1987, 4:45 PM MST for Gila County, Yavapai County, Arizona. It was in force for 2 hr.

The area

The counties it named.

The facts

Issued
Oct 29, 1987, 4:45 PM MST (23:45 UTC)
Expired
Oct 29, 1987, 7:00 PM MST
In force
2 hr
Issued by
NWS Phoenix, AZ
Area
Whole counties

Counties Gila County, AZ, Yavapai County, AZ

The radar

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

The nearest sounding before it

Winslow (Autob), AZ (KINW), launched 12:00Z, 11.8 hours before the alert went out and 128 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-pSkew-T log-p diagram, Winslow (Autob), AZ at 12:00Z on 1987-10-29Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Winslow (Autob), AZ at 12:00Z on 1987-10-29The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 1 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1844 m above ground
0-6 km bulk shear
25 kt
0-1 km storm-relative helicity
1 m²/s²
0-3 km storm-relative helicity
56 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

The text of this product is not in the archive. The NWS text archive before 2002 is incomplete.

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.

In the hours before

Special weather statement, Oct 29, 1:45 PM MST, 3 hours before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
145 PM MST THU OCT 29 1987

WEATHER RADAR AND LOCAL RAIN GAGES AT 130 PM INDICATED LOCALLY
HEAVY SHOWERS AND THUNDERSTORMS WERE IN PROGRESS IN CENTRAL YAVAPAI
COUNTY. AN AUTOMATIC RAIN GAGE NEAR WILHOIT REPORTED A HALF INCH
OF RAIN...AND IT WAS STILL RAINING.

RAINFALL IN THE BRADSHAW MOUNTAINS AND NEAR PRESCOTT COULD BE LOCALLY
HEAVY INTO THE EVENING HOURS...RESULTING IN FLOODED ROADWAY DIPS
AND POSSIBLY FLOODING OF SOME WASHES. THUS CAUTION SHOULD BE USED
THIS AFTERNOON IN THIS AREA.

JP 292145Z
Special weather statement, Oct 29, 2:35 PM MST, 2 hours 10 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE PHOENIX AZ
240 PM MST THU OCT 29 1987

   ...HEAVY SHOWERS AND THUNDERSTORMS WESTERN ARIZONA...

A LARGE AREA OF SHOWERS AND THUNDERSTORMS MOVED INTO ARIZONA FROM
THE WEST AT MIDDAY.  AS THE SHOWERS AND THUNDERSTORMS MOVED INTO
THE MOUNTAINS OF YAVAPAI COUNTY THEY BECAME MORE INTENSE.

NUMEROUS LOCATIONS IN SOUTHERN YAVAPAI COUNTY...FROM THE VICINITY OF
PRESCOTT SOUTHWEST TO AGUILA IN NORTHWEST MARICOPA COUNTY...HAD
REPORTED RAINFALLS OF ONE HALF TO ABOUT ONE INCH OF RAIN BY 215 PM.

THIS AREA IS MOVING EAST AND IS LIKELY TO AFFECT MUCH OF CENTRAL
ARIZONA IN THE LATE AFTERNOON AND EVENING HOURS.

AS OF 230 PM IT DOES NOT APPEAR THAT HEAVY SHOWERS WOULD REACH THE
PHOENIX AREA BY THE 4 TO 6 PM RUSH HOUR PERIOD. NEVERTHELESS...
MOTORISTS AND POLICE DEPARTMENTS SHOULD BE PREPARED FOR THE
POSSIBILITY OF SUCH AN EVENT.

BJOREM 29/2133Z

The office that day

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

IssuedProductOfficeCountiesLasted
Oct 29, 3:55 PM MSTFlash Flood WarningPSRMaricopa65 min
Oct 29, 3:55 PM MSTSevere Thunderstorm WarningPSRMaricopa65 min
Oct 29, 4:45 PM MSTFlash Flood WarningPSRMaricopa2 hr
Oct 29, 4:45 PM MSTFlash Flood WarningPSRGila, Yavapai2 hr
Oct 29, 4:45 PM MSTSevere Thunderstorm WarningPSRMaricopa2 hr

Nearby

Severe Thunderstorm Warnings in Arizona, 1987Every severe thunderstorm warning in 1987

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.