Alert archive / Arizona / Severe Thunderstorm Warnings in 2001

Severe Thunderstorm Warning 29, NWS Flagstaff, AZ

July 8, 2001Coconino County, Arizona

NWS Flagstaff, AZ issued this severe thunderstorm warning at Jul 8, 2001, 12:11 PM MST for Coconino County, Arizona. It was in force for 34 min. 1 report came from 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, with what was reported inside it.

The facts

Issued
Jul 8, 2001, 12:11 PM MST (19:11 UTC)
Expired
Jul 8, 2001, 12:45 PM MST
In force
34 min
Issued by
NWS Flagstaff, AZ
Area
Whole counties; the outline is the Mesonet’s reconstruction

County Coconino County, AZ

What was reported inside it

TimeReportWhereRemark
Jul 8, 12:27 PM MSTThunderstorm Wind 52 MMeteor City, AZA thunderstorm outflow caused a 60 MPH wind gust at the Meteor Crater visitor center.

NCEI Storm Data entries that began inside the alert's area while it was in force. Before 2003 the local storm report archive is thin, so this is the record of what happened rather than what was phoned in.

The nearest sounding before it

Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 7.2 hours before the alert went out and 74 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, Flgstf/Belemont, AZ at 12:00Z on 2001-07-08Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 104 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Flgstf/Belemont, AZ at 12:00Z on 2001-07-08The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity -30 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
104 J/kg
Mixed-layer CIN
-81 J/kg
Mixed-layer LCL
1219 m above ground
0-6 km bulk shear
27 kt
0-1 km storm-relative helicity
-30 m²/s²
0-3 km storm-relative helicity
11 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 KFGZ 081912
SVRFLG

AZC005-081945-

BULLETIN - EAS ACTIVATION REQUESTED
SEVERE THUNDERSTORM WARNING
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
1211 PM MST SUN JUL 8 2001

THE NATIONAL WEATHER SERVICE HAS ISSUED A

* SEVERE THUNDERSTORM WARNING FOR...
  SOUTHEASTERN COCONINO COUNTY IN ARIZONA

* UNTIL 1245 PM MST

* AT 1211 PM MST...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A
  SEVERE THUNDERSTORM 10 MILES SOUTHEAST OF METEOR CRATER...OR ABOUT
  15 MILES SOUTHWEST OF WINSLOW...MOVING NORTH AT 15 MPH.

* THE SEVERE THUNDERSTORM WILL AFFECT OR PASS CLOSE TO... 
  METEOR CRATER AT 1230 PM MST
  TWO GUNS ALONG INTERSTATE 40 AT 1245 PM MST

VERY LARGE HAIL AND STRONG WINDS ARE POSSIBLE WITH THIS SEVERE 
THUNDERSTORM.

REPORT SEVERE WEATHER TO THE NEAREST LAW ENFORCEMENT AGENCY. THEY
WILL RELAY YOUR REPORT TO THE NATIONAL WEATHER SERVICE FORECAST
OFFICE.

LAT...LON 3477 11113 3483 11078 3523 11101 3513 11125

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 Flagstaff, AZ wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 8, 8:45 AM MST, 3 hours 26 minutes earlier.

Area forecast discussion, Jul 8, 8:45 AM MST, 3 hours 26 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
845 AM MST SUN JUL 08 2001

SYNOPSIS...SOUTHERLY FLOW WILL CONTINUE TO SPREAD MOISTURE ACROSS
NORTHERN ARIZONA. EXPECT THE PATTERN OF MAINLY AFTERNOON SHOWERS
AND THUNDERSTORMS TO CONTINUE OVER MUCH OF THE AREA INTO MIDWEEK.

DISCUSSION...DEEP SOUTHERLY FLOW CONTINUES ACROSS THE CWA AS RIDGE
TO OUR EAST...AND WK TROUGH TO OUR WEST KEEPS CONVEYOR BELT OF
MOISTURE STREAMING ACROSS THE AREA. 12Z FGZ SOUNDING...AS WELL AS
THOSE FROM SURROUNDING SITES INDICATE THAT THE ATMOSPHERE HAS
DESTABILIZED SLIGHTLY OVER THE PAST 24 HOURS. IN ADDITION...WE HAVE
SEEN AN INCREASE IN PW VALUES BY A COUPLE OF TENTHS OF AN INCH. A WK
WV WAS DISCERNIBLE ON WV IMAGERY PUSHING ACROSS EASTERN AND CENTRAL
AZ THIS MORNING AND WILL BRING SOME WK UPLIFT MECHANISMS INTO PLAY.
THUS... THUNDERSTORM ACTIVITY A GOOD BET TODAY. ACT SHOULD BE A
LITTLE MORE WIDESPREAD THAN YSTDYS ACT. WILL ISSUE 1ST PD UPDATE
SHORTLY BRING AREAL QUALIFIERS TO 1ST PD. MCGRATH

.FGZ...NONE.

In the hours before

Special weather statement, Jul 8, 9:30 AM MST, 2 hours 41 minutes before
AZZ004>018-037>040-081930-

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE FLAGSTAFF AZ
930 AM MST SUN JUL 08 2001

...SCATTERED THUNDERSTORMS...SOME WITH HEAVY DOWNPOURS...ACROSS
NORTHERN  ARIZONA TODAY...

A DEEP PLUME OF MONSOON MOISTURE WITH DEEP SOUTHERLY FLOW WILL
REMAIN ACROSS NORTHERN ARIZONA TODAY. THE ATMOSPHERE OVER NORTHERN
ARIZONA HAS DESTABILIZED SLIGHTLY OVER THE PAST 24 HOURS. AS A
RESULT...MORE THUNDERSTORM ACTIVITY CAN BE EXPECTED TODAY. THE
STRONGEST THUNDERSTORMS IN NORTHERN ARIZONA WILL DEVELOP ACROSS THE
EASTERN AND CENTRAL MOUNTAINS...AS A WEAK DISTURBANCE MOVES ACROSS
THE AREA LATER TODAY. DUE TO THE ABUNDANT MOISTURE...SOME OF THESE
STORMS WILL BE CAPABLE OF PRODUCING HEAVY DOWNPOURS...ALONG WITH
SMALL HAIL. EXPECT STREAMS AND WASHES IN THE VICINITY OF THESE
STORMS THAT ARE NORMALLY DRY TO FLOW WITH WATER.

SPOTTER REPORTS OF EXCESSIVE RAINFALL AMOUNTS AND SEVERE WEATHER
SHOULD BE RELAYED TO THE NATIONAL WEATHER SERVICE.   $$

MCGRATH

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 8, 12:47 PM MSTSevere Thunderstorm WarningFGZCoconino38 min
Jul 8, 3:27 PM MSTFlash Flood WarningFGZCoconino33 min

Nearby

Severe Thunderstorm Warnings in Arizona, 2001Every 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.