Alert archive / Arizona / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 4, NWS Flagstaff, AZ

July 24, 1990Yavapai County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 24, 1990, 1:25 AM MST for Yavapai County, Arizona. It was in force for 110 min.

The area

The counties it named.

The facts

Issued: Jul 24, 1990, 1:25 AM MST (08:25 UTC)
Expired: Jul 24, 1990, 3:15 AM MST
In force: 110 min
Issued by: NWS Flagstaff, AZ
Area: Whole counties

County 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 00:00Z, 8.4 hours before the alert went out and 176 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: 6 J/kg
Mixed-layer CIN: -497 J/kg
Mixed-layer LCL: 2894 m above ground
0-6 km bulk shear: 22 kt
0-1 km storm-relative helicity: 16 m²/s²
0-3 km storm-relative helicity: 91 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
TTAA00 KPHX 240829
SVRPHX
AZC013-025-241015-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
125 AM MST TUE JUL 24 1990
 
THE NATIONAL WEATHER SERVICE IN PHOENIX ARIZONA HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL  315 AM MST
FOR THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL ARIZONA
 
   ...CENTRAL MARICOPA COUNTY ...WHICH INCLUDES THE GREATER PHOENIX
ARES NORTH TO CAREFREE AND CAVE CREEK...
 
AND IN WEST CENTRAL ARIZONA
 
   ...SOUTH CENTRAL YAVAPAI COUNTY... WHICH INCLUDES SECTIONS ALONG
INTERSTATE 17 AROUND BETWEEN BUMBLE BEE AND ROCK SPRINGS...
 
 
THE SEVERE THUNDERSTORM WARNING ISSUED EARLIER FOR CENTRAL MARICOPA
COUNTY WHICH INCLUDED THE GREATER PHOENIX AREA HAS BEEN EXTENDED FOR 2
ADDITIONAL HOURS... AND NOW INCLUDES SECTIONS OF YAVAPAI COUNTY ALONG
INTERSTATE 17 BETWEEN BUMBLE BEE AND ROCK SPRINGS.
 
 
INTENSE THUNDERSTORMS DEVELOPED IN THE GREATER PHOENIX AREA AFTER 11
PM MONDAY EVENING.  AT 115 AM TUESDAY WEATHER RADAR DETECTED ANOTHER
AREA OF INTENSE THUNDERSTORMS DEVELOPING IN SOUTHERN YAVAPAI COUNTY
BETWEEN BUMBLE BEE ALONG INTERSTATE 17  SOUTH TO NORTH PHOENIX  IN
PARADISE VALLEY.
 
THUNDERSTORMS IN THE GREATER PHOENIX AREA ARE EXPECTED TO LAST FOR
ANOTHER 2 HOURS AND COULD PRODUCE DAMAGING WINDS IN EXCESS 60 MPH
FOLLOWED BY VERY HEAVY RAIN.
 
FLOODING OF STREETS AND WASHES ARE ALSO A POSSIBILITY.
 
 
SEVERE THUNDERSTORMS CAUSE DAMAGING WINDS...LARGE HAIL AND DEADLY
LIGHTNING. MOVE INSIDE A REINFORCED BUILDING OR STORM SHELTER. GO TO
AN INTERIOR ROOM OR HALLWAY ON THE LOWEST FLOOR. STAY AWAY FROM
WINDOWS.
 
WATCH OUT FOR FLASH FLOODING. STAY AWAY FROM STREAMS AND AVOID NARROW
STEPEP WALLED CANYONS. DONT DRIVE ACROSS FLOODED STREAMS OR WASHES...
OR INTO FLOODED CITY STREETS OR UNDERPASSES.

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 24, 1:25 AM MST	Severe Thunderstorm Warning	FGZ	Maricopa	110 min
Jul 24, 3:03 AM MST	Severe Thunderstorm Warning	FGZ	Yavapai	117 min
Jul 24, 3:03 AM MST	Severe Thunderstorm Warning	FGZ	Maricopa	117 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1990 Every severe thunderstorm warning in 1990

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.