Alert archive / Arizona / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 7, NWS Flagstaff, AZ

July 24, 1990Maricopa County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 24, 1990, 3:03 AM MST for Maricopa County, Arizona. It was in force for 117 min.

The area

The counties it named.

The facts

Issued: Jul 24, 1990, 3:03 AM MST (10:03 UTC)
Expired: Jul 24, 1990, 5:00 AM MST
In force: 117 min
Issued by: NWS Flagstaff, AZ
Area: Whole counties

County Maricopa 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

Tuscon, AZ (KTUS), launched 00:00Z, 10.1 hours before the alert went out and 198 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: 41 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 2646 m above ground
0-6 km bulk shear: 16 kt
0-1 km storm-relative helicity: 14 m²/s²
0-3 km storm-relative helicity: 3 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 241013
SVRPHX
AZC013-025-241200-
 
BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE PHOENIX ARIZONA
303 AM MST TUE JUL 24 1990
 
THE NATIONAL WEATHER SERVICE IN PHOENIX ARIZONA HAS ISSUED A
SEVERE THUNDERSTORM AND FLASH FLOOD WARNING
EFFECTIVE UNTIL  500 AM MST
FOR THE FOLLOWING LOCATIONS...
 
IN SOUTH CENTRAL ARIZONA
 
   ...EAST CENTRAL MARICOPA COUNTY... WHICH INCLUDES THE GREATER
PHOENIX AREA NORTH TO CAVE CREEK AND CAREFREE.
IN WEST CENTRAL ARIZONA
 
   ...SOUTH CENTRAL YAVAPAI COUNTY ...SECTIONS OF INTERSTATE 17 FROM
BUMBLE BEE TO ROCK SPRINGS.
 
 
THE SEVERE THUNDERSTORM WARNING ISSUED EARLIER FOR THE GREATER PHOENIX
AREA NORTH TO BUMBLE BEE HAS BEEN EXTENDED UNTIL 5AM.  IT HAS ALSO
BEEN UPGRADED TO INCLUDE A FLASH FLOOD WARNING.
 
 
SEVERE THUNDERSTORMS BEGAN IN THE GREATER PHOENIX AREA AFTER 1130 PM
MONDAY EVENING. THEY WILL LIKELY CONTINUE ALONG WITH VERY HEAVY RAIN
UNTIL 5AM THIS MORNING.
 
 
THERE WERE MANY REPORTS OF 50 TO 60 MPH WINDS ALONG WITH SOME DAMAGE.
SECTIONS OF A ROOF INCLUDING AN AIR CONDITIONER WERE BLOWN OFF A
CONVIENENT STORE AT 40 TH STREET AND UNION HILLS.   ALSO SEVERAL CAR
WINDOWS WERE BLOWN OUT DUE TO EITHER HAIL OR HIGH WINDS NEAR 35 TH AVE
AND BELL.
 
 
VERY HEAVY RAIN FOLLOWED THESE THUNDERSTORMS. THERE WERE REPORTS OF
EXTENSIVE STREET FLOODING IN SECTIONS OF NORTH PHOENIX. WASHES AND
STREET FLOODING WERE REPORTED IN CAVE CREEK... NORTH
SCOTTSDALE... AND NORTHWEST PHOENIX AROUND 16 TH STREET AND
CAMELBACK.
 
 
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
STEEP WALLED CANYONS. DONT DRIVE ACROSS FLOODED STREAMS OR WASHES...
OR INTO FLOODED CITY STREETS OR UNDERPASSES.
 
 
VASQUEZ

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	Yavapai	110 min
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

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.