Alert archive / Arizona / Severe Thunderstorm Warnings in 1997

Severe Thunderstorm Warning 78, NWS Tucson, AZ

August 20, 1997Cochise County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 20, 1997, 3:46 PM MST for Cochise County, Arizona. It was in force for 64 min. No storm report in the archive falls inside the area while it was in force.

The area

The counties it named.

The facts

Issued
Aug 20, 1997, 3:46 PM MST (22:46 UTC)
Expired
Aug 20, 1997, 4:50 PM MST
In force
64 min
Issued by
NWS Tucson, AZ
Area
Whole counties

County Cochise County, AZ

The radar

The Tucson radar (KEMX), 83 km from the middle of the area, began a volume at 22:49 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The nearest sounding before it

Tuscon, AZ (KTUS), launched 12:00Z, 10.8 hours before the alert went out and 113 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, Tuscon, AZ at 12:00Z on 1997-08-20Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 32 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Tuscon, AZ at 12:00Z on 1997-08-20The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 36 square meters per square second.1939Sfc1 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
32 J/kg
Mixed-layer CIN
-305 J/kg
Mixed-layer LCL
2416 m above ground
0-6 km bulk shear
7 kt
0-1 km storm-relative helicity
36 m²/s²
0-3 km storm-relative helicity
119 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 202248 RRA
SVRTUS
AZC003-202350-

BULLETIN - IMMEDIATE BROADCAST REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
346 PM MST WED AUG 20 1997

THE NATIONAL WEATHER SERVICE IN TUCSON AZ HAS ISSUED A
SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 450 PM MST
FOR PEOPLE IN THE FOLLOWING LOCATION...

IN SOUTHEASTERN ARIZONA

   ...SOUTHERN COCHISE COUNTY
 
AT 345 PM MST...DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM 11
MILES EAST NORTHEAST OF BISBEE MOVING WEST AT 10 MPH.

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.

NWS Tucson, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Aug 20, 2:30 PM MST, 1 hour 16 minutes earlier.

Area forecast discussion, Aug 20, 2:30 PM MST, 1 hour 16 minutes before
SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
230 PM MST WED AUG 20 1997

CONVECTION SLOW TO DVLP BUT NOW FIRING OVR MTNS THRU SE AZ...EVEN
MORE IMPRESSIVE IS ACTION TO OUR E IN NM...WATCH FOR EVE
OUTFLOWS. SHOULD SEE MORE ACTIVITY THIS EVE WITH POTENTIAL FOR
A VALLEY STORMS HERE. MSTR STILL NOT THE BEST BUT THIS WILL CHG
OVR THE NEXT 48 HRS AS SELY FLOW OUT OF MEX GOING AGN (RDG TO
THE E). GLF SURGE BCMG A VIABLE OPTION WITH ORGANIZED TSTM DVLPMT
TO SEND OUTFLOW THRU GLF AND SYNOPTIC FLOW BCMS FAVORABLE TO HELP
THINGS ALONG. OUTFLOW FROM COMPLEXES IN NW MEX AND NM COULD ALSO
BE A CONTRIBUTOR...ALONG WITH WK IMPL BURIED IN ELY FLOW WRAPPING
INTO OUR AREA. CONTG FCST TREND OF INCRG TSTMS WITH BETTER STORMS
THIS EVE AND TMW A GOOD SOLID DAY. TEMPS SHOULD MODERATE A BIT
WITH INCRG MSTR. TUS 3343. MEYER

TUS...NONE

In the hours before

Special weather statement, Aug 20, 12:12 PM MST, 3 hours 34 minutes before
AZZ019-026>030-192300-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1145 AM MST WED AUG 20 1997...THIS PRODUCT IS NOT UPDATED

                AREAL    PROBABILITY   RAIN GREATER THAN   STORM
              COVERAGE    OF SEVERE     1.00       2.00    MOTION

COCHISE          40          30          40         20      W 10
GRAHAM           25          15          15         10     NW  8
GREENLEE         30          15          10          5     SW  8
TUCSON/ERN PIMA  25          15          20         10     NW  8
TOHONO OODHAM   15          10          20          5     NW  8
WESTERN PIMA     10          10          10          2     NW  8
SOUTHEAST PINAL  10          10          15          5     NW  8
SANTA CRUZ       40          35          40         20     NW 10

SYNOPSIS...MOISTURE SPREADING NORTHWARD FROM MEXICO WILL ALLOW
SCATTERED STORMS TO DEVELOP MAINLY NEAR THE MEXICAN BORDER...AND
THEN SPREAD NORTHWARD LATE THIS AFTERNOON OR EVENING.  LOCALLY
HEAVY RAIN AND STRONG WIND IS MOST LIKELY TO OCCUR NEAR THE
MEXICAN BORDER WHERE MOISTURE AND INSTABILITY WILL BE GREATEST.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
                  THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
                  REACH SEVERE LEVELS (DAMAGING WIND AND/OR
                  LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
                  PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
                  ANY LOCATION
STORM MOTION   - GENERAL DIRECTION TO WHICH THE STORMS WILL
                  LIKELY MOVE AND SPEED IN MPH

NOTE...
VALID TIME IS FROM 12 NOON TO 12 MIDNIGHT OF THE DAY OF ISSUANCE

THIS PRODUCT IS NOT TO BE USED IN PLACE OF SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES.

END/MEYER
Special weather statement, Aug 20, 12:56 PM MST, 2 hours 50 minutes before
AZZ019-026>030-202300-
SPECIAL WEATHER STATEMENT...SOUTHEAST ARIZONA CONVECTIVE OUTLOOK
NATIONAL WEATHER SERVICE TUCSON AZ
1145 AM MST WED AUG 20 1997...THIS PRODUCT IS NOT UPDATED

                AREAL    PROBABILITY   RAIN GREATER THAN   STORM
              COVERAGE    OF SEVERE     1.00       2.00    MOTION

COCHISE          40          30          40         20      W 10
GRAHAM           25          15          15         10     NW  8
GREENLEE         30          15          10          5     SW  8
TUCSON/ERN PIMA  25          15          20         10     NW  8
TOHONO OODHAM   15          10          20          5     NW  8
WESTERN PIMA     10          10          10          2     NW  8
SOUTHEAST PINAL  10          10          15          5     NW  8
SANTA CRUZ       40          35          40         20     NW 10

SYNOPSIS...MOISTURE SPREADING NORTHWARD FROM MEXICO WILL ALLOW
SCATTERED STORMS TO DEVELOP MAINLY NEAR THE MEXICAN BORDER...AND
THEN SPREAD NORTHWARD LATE THIS AFTERNOON OR EVENING.  LOCALLY
HEAVY RAIN AND STRONG WIND IS MOST LIKELY TO OCCUR NEAR THE
MEXICAN BORDER WHERE MOISTURE AND INSTABILITY WILL BE GREATEST.
*****************************************************************
KEY...
AREAL COVERAGE - PERCENT OF COUNTY OR AREA THAT WILL EXPERIENCE
                  THUNDERSTORMS
PROB OF SEVERE - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
                  REACH SEVERE LEVELS (DAMAGING WIND AND/OR
                  LARGE HAIL)
RAIN GRTR THAN - THE PROBABILITY THAT ANY ONE OF THE STORMS WILL
                  PRODUCE RAIN EXCEEDING 1 INCH OR 2 INCHES IN
                  ANY LOCATION
STORM MOTION   - GENERAL DIRECTION TO WHICH THE STORMS WILL
                  LIKELY MOVE AND SPEED IN MPH

NOTE...
VALID TIME IS FROM 12 NOON TO 12 MIDNIGHT OF THE DAY OF ISSUANCE

THIS PRODUCT IS NOT TO BE USED IN PLACE OF SEVERE THUNDERSTORM OR
FLASH FLOOD WARNINGS OR WATCHES. THIS PRODUCT IS ONLY USED FOR
OUTLOOK PURPOSES.

END/MEYER
Local storm report, Aug 20, 1:37 PM MST, 2 hours 9 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON ARIZONA
137 PM MST WED AUG 20 1997

TIME(MST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0911 AM    TUBAC                     AZ
08/20/97   SANTA CRUZ                     THIS IS ONLY A TEST
Local storm report, Aug 20, 1:39 PM MST, 2 hours 7 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE TUCSON ARIZONA
137 PM MST WED AUG 20 1997

TIME(MST)  .....CITY LOCATION..... STATE  ...EVENT/REMARKS...
           ....COUNTY LOCATION....

0911 AM    TUBAC                     AZ
08/20/97   SANTA CRUZ                     THIS IS ONLY A TEST

Nearby

Severe Thunderstorm Warnings in Arizona, 1997Every severe thunderstorm warning in 1997

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; radar from the NEXRAD Level II archive.