Alert archive / Arizona / Severe Thunderstorm Warnings in 1987
Severe Thunderstorm Warning 13, NWS Phoenix, AZ
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.
- 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
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.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Oct 29, 3:55 PM MST | Flash Flood Warning | PSR | Maricopa | 65 min |
| Oct 29, 3:55 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 65 min |
| Oct 29, 4:45 PM MST | Flash Flood Warning | PSR | Maricopa | 2 hr |
| Oct 29, 4:45 PM MST | Flash Flood Warning | PSR | Gila, Yavapai | 2 hr |
| Oct 29, 4:45 PM MST | Severe Thunderstorm Warning | PSR | Maricopa | 2 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.