Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 57, NWS Tucson, AZ

August 28, 2001Santa Cruz County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Aug 28, 2001, 10:09 PM MST for Santa Cruz County, Arizona. It was in force for 36 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline the Iowa Environmental Mesonet reconstructed for it; the warning itself named whole counties.

The facts

Issued: Aug 28, 2001, 10:09 PM MST (05:09 UTC)
Expired: Aug 28, 2001, 10:45 PM MST
In force: 36 min
Issued by: NWS Tucson, AZ
Area: Whole counties; the outline is the Mesonet’s reconstruction

County Santa Cruz County, AZ

The radar

The Tucson radar (KEMX), 55 km from the middle of the area, began a volume at 05:10 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 00:00Z, 5.2 hours before the alert went out and 78 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: 252 J/kg
Mixed-layer CIN: -28 J/kg
Mixed-layer LCL: 3818 m above ground
0-6 km bulk shear: 15 kt
0-1 km storm-relative helicity: 8 m²/s²
0-3 km storm-relative helicity: 6 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 
WUUS55 KTWC 290510
SVRTUS
AZC023-290545-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
1009 PM MST TUE AUG 28 2001

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTH CENTRAL SANTA CRUZ COUNTY IN ARIZONA
  THIS INCLUDES NOGALES

* UNTIL 1045 PM MST

* AT 1000 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 11 MILES NORTHEAST OF NOGALES...MOVING SOUTH
  AT 10 MPH.

REMEMBER...A SEVERE THUNDERSTORM CAN PRODUCE LARGE HAIL...DAMAGING
WINDS IN EXCESS OF 60 MPH...DEADLY LIGHTNING...AND HEAVY RAIN.

LAT...LON 3154 11097 3136 11098 3135 11087 3154 11086

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 28, 9:20 PM MST, 49 minutes earlier.

Area forecast discussion, Aug 28, 9:20 PM MST, 49 minutes before

SOUTHEAST ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TUCSON AZ
920 PM MST TUE AUG 28 2001

.SYNOPSIS...HIGH PRESSURE CENTERED OFF THE SOUTHERN CALIFORNIA COAST
WILL MOVE WEST...ALLOWING TEMPERATURES TO FALL TO NEAR NORMAL VALUES
BY THIS WEEKEND. MOISTURE FROM THE SOUTH AND EAST ALONG WITH DAYTIME
HEATING WILL HELP TO GENERATE AFTERNOON AND EVENING THUNDERSTORMS
THROUGH THE UPCOMING HOLIDAY WEEKEND...BUT THEY WILL BE MAINLY
CONFINED TO THE MOUNTAINS.

.DISCUSSION...SHOWERS AND THUNDERSTORMS THAT OCCURRED EARLIER ACROSS
PORTIONS OF THE EASTERN CWA HAVE EITHER DISSIPATED OR MOVED SOUTH
INTO SONORA. ISOLATED SHOWERS WERE LINGERING ACROSS WRN/COCHISE AND
SANTA CRUZ COUNTIES. 29/00Z TUS SOUNDING FAIRLY STABLE WITH LIFTED
INDEX AROUND PLUS 1 AND NWLY/NLY FLOW ABOVE H6. IR IMAGERY INDICATED
CLOUD TOPS WARMING EXCEPT FAR SE WHERE SOME COOLING WAS NOTED. GOES
PRECIP WATER IMAGERY INDICATED VALUES GENERALLY 0.65 - 0.90 WRN/
CENTRAL SECTIONS WITH VALUES APPROACHING 1 INCH E. MCC ONGOING OVER
NRN/CENTRAL SONORA. WILL KEEP ISOLATED SHOWERS/THUNDERSTORMS REST OF
TONIGHT MAINLY NEAR THE MEXICAN BORDER SANTA CRUZ/COCHISE COUNTIES
WHERE MARKED INCREASE IN LOW LEVEL MOISTURE HAS OCCURRED AND
PROXIMITY TO SONORA MCC MAY BE SUFFICIENT FOR FURTHER DEVELOPMENT.
WILL REMOVE PREVIOUS MENTION OF PRECIPITATION ELSEWHERE. CONCERN FOR
WED IS FOR THE INITIATION OF SHOWERS/TSTMS. PREVIOUS AFD MENTIONED
POSSIBILITY OF INCREASED MOISTURE ESPECIALLY ERN ZONES. ALTHOUGH
CONVECTIVE COMPLEX FAILED TO DEVELOP OVER WRN NM...THE SCENARIO FOR
INCREASED MOISTURE E APPEARS VALID DUE TO ONGOING MCC AND ASSOCIATED
SURGE FROM THE S. MENTION OF SCATTERED SHOWERS/TSTMS SE HANNAGAN
MEADOW-SAFFORD-NOGALES LINE MAY BE WARRANTED. WILL DEFER THAT
DECISION TO THE MID-SHIFT DECISION THOUGH.  BF

.TWC...NONE.

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 29, 12:49 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	41 min
Aug 29, 3:19 PM MST	Severe Thunderstorm Warning	TWC	Greenlee	26 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2001 Every severe thunderstorm warning in 2001

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.