Alert archive / Arizona / Severe Thunderstorm Warnings in 1990

Severe Thunderstorm Warning 7, NWS Tucson, AZ

September 3, 1990Pima County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Sep 3, 1990, 1:31 PM MST for Pima County, Arizona. It was in force for 59 min.

The area

The counties it named.

The facts

Issued: Sep 3, 1990, 1:31 PM MST (20:31 UTC)
Expired: Sep 3, 1990, 2:30 PM MST
In force: 59 min
Issued by: NWS Tucson, AZ
Area: Whole counties

County Pima 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 12:00Z, 8.5 hours before the alert went out and 84 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: 682 J/kg
Mixed-layer CIN: -170 J/kg
Mixed-layer LCL: 1517 m above ground
0-6 km bulk shear: 8 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 21 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 KTUS 032031
SVRTUS
AZC019-032130-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING 
NATIONAL WEATHER SERVICE TUCSON AZ
131 PM MST MON SEP 3 1990

THE NATIONAL WEATHER SERVICE HAS ISSUED A SEVERE THUNDERSTORM 
WARNING EFFECTIVE UNTIL 230 PM MST FOR PEOPLE IN THE FOLLOWING 
COUNTY

   IN THE SOUTH CENTRAL PART OF ARIZONA
      EASTERN PIMA

AT 1:20 PM A SEVERE THUNDERSTORM WAS MOVING THROUGH THE SOUTHERN
PORTION OF TUCSON. THE THUNDERSTORM HAD WIND GUST TO 71 MPH AND
HAIL TO 1/4 INCH. HEAVY RAINFALL OF 1.49 INCH FELL AT THE AIRPORT
IN ABOUT 15 MINUTES TIME.

IF YOU ARE IN AN AREA THREATENED BY THE STORM..GO TO A REINFORCED
SHELTER AND PREPARE FOR DAMAGING WIND...LARGE HAIL...VERY HEAVY
RAIN AND LIGHTNING.

INTENSE LIGHTNING IS REPORTED WITH THIS STORM.  IF OUTDOORS...
STAY AWAY FROM HIGH OBJECTS.  MOVE INDOORS IF POSSIBLE.  WHEN
INDOORS...STAY AWAY FROM WINDOWS AND DOORS AND AVOID USING
TELEPHONES AND ELECTRICAL EQUIPMENT.

  IMES

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, Sep 3, 1:10 PM MST, 21 minutes before

AZZ007>009>010-032200-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE TUCSON AZ
105 PM MST MON SEP 3 1990

AT 105 PM WEATHER RADAR SHOWED THUNDERSTORMS DEVELOPING THROUGHOUT
SOUTHEASTERN ARIZONA.  THE STRONGEST THUNDERSTORMS WERE IN THE AJO
AREA IN CENTRAL PIMA COUNTY AND NEAR TUBAC ALONG 1-19 IN SANTA CRUZ
COUNTY.

THESE STORMS WERE MOVING TOWARD THE WEST AT 10 TO 15 MPH.

STRONG POSSIBLY DAMAGING WINDS...HEAVY RAIN WHICH COULD CAUSE FLOODING
OF ROADS AND WASHES AND DANGEROUS CLOUD TO GROUND LIGHTNING ARE LIKELY
WITH THESE STORMS...SO CAUTION IS ADVISED.

IMES

The office that day

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

Issued	Product	Office	Counties	Lasted
Sep 3, 2:18 PM MST	Flash Flood Warning	TWC	Pima	57 min
Sep 3, 2:18 PM MST	Severe Thunderstorm Warning	TWC	Pima	57 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.