Alert archive / Arizona / Severe Thunderstorm Warnings in 1999

Severe Thunderstorm Warning 21, NWS Tucson, AZ

July 6, 1999Cochise County, Arizona

NWS Tucson, AZ issued this severe thunderstorm warning at Jul 6, 1999, 12:38 PM MST for Cochise County, Arizona. It was in force for 47 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
Jul 6, 1999, 12:38 PM MST (19:38 UTC)
Expired
Jul 6, 1999, 1:25 PM MST
In force
47 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 19:37 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, 7.6 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 1999-07-06Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 30 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 1999-07-06The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 43 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
30 J/kg
Mixed-layer CIN
-398 J/kg
Mixed-layer LCL
2099 m above ground
0-6 km bulk shear
13 kt
0-1 km storm-relative helicity
43 m²/s²
0-3 km storm-relative helicity
31 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 061936 RRA
SVRTUS
AZC003-062025-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE TUCSON AZ
1238 PM MST TUE JUL 6 1999

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  NORTHWESTERN COCHISE COUNTY IN SOUTHEASTERN ARIZONA
  INCLUDING CASCABEL

* UNTIL 125 PM MST

* AT 1234 PM MST... DOPPLER RADAR INDICATED A SEVERE THUNDERSTORM
  WITH EXTREMELY HEAVY RAINFALL 13 MILES SOUTHWEST OF WILLCOX OR 7
  MILES NORTHWEST OF COCHISE... MOVING WEST AT 15 MPH.

THE NATIONAL WEATHER SERVICE IN TUCSON HAS ISSUED A SEVERE
THUNDERSTORM WARNING FOR NORTHWEST COCHISE COUNTY INCLUDING
CASCABEL UNTIL 125 PM MST. DOPPLER RADAR INDICATED A SEVERE
THUNDERSTORM WITH EXTREMELY HEAVY RAINFALL 13 MILES SOUTHWEST OF
WILLCOX MOVING WEST AT 15 MPH.

BRYANT

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 6, 12:18 PM MSTSevere Thunderstorm WarningTWCCochise47 min
Jul 6, 1:10 PM MSTSevere Thunderstorm WarningTWCCochise60 min
Jul 6, 1:17 PM MSTSevere Thunderstorm WarningTWCSanta Cruz48 min
Jul 6, 1:35 PM MSTSevere Thunderstorm WarningTWCPima60 min
Jul 6, 1:59 PM MSTSevere Thunderstorm WarningTWCPima, Santa Cruz66 min

Nearby

Severe Thunderstorm Warnings in Arizona, 1999Every severe thunderstorm warning in 1999

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.