Alert archive / Arizona / Tornado Warnings in 1999
Tornado Warning 2, NWS Flagstaff, AZ
NWS Flagstaff, AZ issued this tornado warning at Sep 14, 1999, 1:51 PM MST for Yavapai County, Arizona. It was in force for 34 min. 1 report came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Sep 14, 1999, 1:51 PM MST (20:51 UTC)
- Expired
- Sep 14, 1999, 2:25 PM MST
- In force
- 34 min
- Issued by
- NWS Flagstaff, AZ
- Area
- Whole counties
County Yavapai County, AZ
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 14, 1:52 PM MST | Tornado F0 | Chino Vly, AZ |
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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Sep 14, 1:45 PM MST | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Flgstf/Belemont, AZ (KFGZ), launched 12:00Z, 8.9 hours before the alert went out and 98 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.
- Mixed-layer CAPE
- 60 J/kg
- Mixed-layer CIN
- -99 J/kg
- Mixed-layer LCL
- 1908 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 174 m²/s²
- 0-3 km storm-relative helicity
- 189 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
231 WFUS1 KFLG 142054 RRA TORFLG AZC025-142125- BULLETIN - EAS ACTIVATION REQUESTED TORNADO WARNING NATIONAL WEATHER SERVICE FLAGSTAFF AZ 151 PM MST TUE SEP 14 1999 THE NATIONAL WEATHER SERVICE IN FLAGSTAFF HAS ISSUED A * TORNADO WARNING FOR... NORTH CENTRAL YAVAPAI COUNTY IN CENTRAL ARIZONA * UNTIL 225 PM MST * AT 150 PM MST... DOPPLER RADAR AND SPOTTERS INDICATED A TORNADO 22 MILES NORTHEAST OF PRESCOTT OR 12 MILES NORTHWEST OF JEROME... MOVING EAST AT 25 MPH. * THIS TORNADIC STORM IS EXPECTED TO BE NEAR... JEROME AT 215 PM MST IF A TORNADO IS ON THE GROUND GO TO THE BASEMENT IF A BASEMENT IS NOT AVAILABLE...GO TO A SMALL INTERIOR ROOM ON THE LOWEST FLOOR JD
What forecasters said that day
The local office's own words before this tornado 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 tornado warning went out at Sep 14, 9:00 AM MST, 4 hours 51 minutes earlier.
Area forecast discussion, Sep 14, 9:00 AM MST, 4 hours 51 minutes before
NORTHERN ARIZONA FORECAST DISCUSSION NATIONAL WEATHER SERVICE FLAGSTAFF AZ 900 AM MST TUE SEP 14 1999 SYNOPSIS...A PACIFIC WEATHER DISTURBANCE WILL MOVE ACROSS NORTHERN ARIZONA TODAY AND WEDNESDAY BRINGING MOSTLY CLOUDY SKIES AND WIDESPREAD SHOWERS AND THUNDERSTORMS. A DRYING TREND WILL BEGIN ON THURSDAY AND FRIDAY BUT SOME MOISTURE ALONG WITH A CHANCE OF THUNDERSTORMS WILL LINGER OVER EASTERN ARIZONA. DISCUSSION...CURRENT FORECAST LOOKS GOOD WITH NO UPDATES. A SHORT WAVE TROUGH CONTINUES TO APPROACH NORTHERN ARIZONA FROM THE WEST. AT 250 MB THE REAR ENTRANCE REGION OF A JET MAX WILL EXTEND ACROSS NORTHERN ARIZONA WITH A Q-VECTOR ANALYSIS INDICATING UPWARD FORCING. THIS WILL RESULT IN A GENERAL STRENGTHENING OF THE BAROCLINIC ZONES ACROSS ARIZONA WITH A GRADUAL COOLING OF THE AIR MASS. AROUND THE 700 MB LEVEL ANTICYCLONIC CIRCULATION OVER FAR SOUTHEAST ARIZONA CONTINUES TO ADVECT MOISTURE INTO WESTERN AND CENTRAL ARIZONA. THIS MOISTURE IS MOVING INTO AN AREA OF LOW TO MID LEVEL ISENTROPIC LIFT OVER CENTRAL AND NORTHERN ARIZONA THIS MORNING. THE ETA IS SHOWING AS MUCH AS 100 MB OF LIFT BETWEEN FAR SOUTHWEST AND NORTHERN ARIZONA. THIS APPEARS REASONABLE SINCE GENERAL CLOUDINESS CONTINUES TO DEVELOP ACROSS NORTHERN ARIZONA THIS MORNING WITH EMBEDDED SHOWERS AND THUNDERSTORMS. ACCORDING TO THE ETA THIS REGION OF ISENTROPIC LIFT CONTINUES INTO WEDNESDAY. AS A RESULT...THINK SHOWERS AND THUNDERSTORMS WILL BE WIDESPREAD TODAY AND TONIGHT AND WILL LIKELY EXTEND INTO WEDNESDAY. THERE IS SOME SHEAR ALOFT AND WITH DECENT CAPE VALUES DEVELOPING TODAY OVER YAVAPAI AND NORTHERN GILA COUNTIES WOULDNT BE SURPRISED TO SEE A FEW SEVERE STORMS (MAIN THREAT LARGE HAIL). WITH PERSISTENT MOIST FLOW FROM THE SOUTHWEST CANT RULE OUT SOME LOCALIZED FLOODING ESPECIALLY NEAR THE MOGOLLON RIM WHERE CELL TRAINING MAY OCCUR. OTHERWISE...DO NOT EXPECT A WIDESPREAD FLASH FLOOD THREAT. MCCOLLUM. .FLG...NONE.
In the hours before
Special weather statement, Sep 14, 9:30 AM MST, 4 hours 21 minutes before
AZZ004>018-037>040-142000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST TUE SEP 14 1999 ...STRONG THUNDERSTORMS CAPABLE OF PRODUCING LARGE HAIL ACROSS YAVAPAI AND NORTHERN GILA COUNTIES TODAY... ...SPOTTER REPORTS REQUESTED... DISCUSSION...A PACIFIC WEATHER DISTURBANCE WILL MOVE ACROSS NORTHERN ARIZONA TODAY. IN ADVANCE OF THIS SYSTEM MOISTURE FROM THE GULF OF CALIFORNIA HAS BEEN DRAWN NORTHWARD ACROSS ARIZONA. AS A RESULT...THE AIR MASS OVER NORTHERN ARIZONA HAS BECOME UNSTABLE WITH WIDESPREAD SHOWERS AND THUNDERSTORMS EXPECTED. IN ADDITION...THE FLOW ALOFT TODAY WILL BE SUPPORTIVE OF MORE ORGANIZED STORMS ESPECIALLY IN YAVAPAI AND NORTHERN GILA COUNTIES... WHERE THERE IS A THREAT OF ISOLATED SEVERE STORMS CAPABLE OF PRODUCING HAIL IN EXCESS OF ONE INCH IN DIAMETER. STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE NEWS SOURCE FOR FURTHER UPDATES. MCCOLLUM
Special weather statement, Sep 14, 9:30 AM MST, 4 hours 21 minutes before
AZZ004>018-037>040-142000- HAZARDOUS WEATHER OUTLOOK NATIONAL WEATHER SERVICE FLAGSTAFF AZ 930 AM MST TUE SEP 14 1999 ...STRONG THUNDERSTORMS CAPABLE OF PRODUCING LARGE HAIL ACROSS YAVAPAI AND NORTHERN GILA COUNTIES TODAY... ...SPOTTER REPORTS REQUESTED... DISCUSSION...A PACIFIC WEATHER DISTURBANCE WILL MOVE ACROSS NORTHERN ARIZONA TODAY. IN ADVANCE OF THIS SYSTEM MOISTURE FROM THE GULF OF CALIFORNIA HAS BEEN DRAWN NORTHWARD ACROSS ARIZONA. AS A RESULT...THE AIR MASS OVER NORTHERN ARIZONA HAS BECOME UNSTABLE WITH WIDESPREAD SHOWERS AND THUNDERSTORMS EXPECTED. IN ADDITION...THE FLOW ALOFT TODAY WILL BE SUPPORTIVE OF MORE ORGANIZED STORMS ESPECIALLY IN YAVAPAI AND NORTHERN GILA COUNTIES... WHERE THERE IS A THREAT OF ISOLATED SEVERE STORMS CAPABLE OF PRODUCING HAIL IN EXCESS OF ONE INCH IN DIAMETER. STAY TUNED TO NOAA WEATHER RADIO OR YOUR FAVORITE NEWS SOURCE FOR FURTHER UPDATES. MCCOLLUM
The office that day
Everything else NWS Flagstaff, AZ issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Sep 14, 5:44 AM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 46 min |
| Sep 14, 6:24 AM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 36 min |
| Sep 14, 9:05 AM MST | Severe Thunderstorm Warning | FGZ | Coconino | 45 min |
| Sep 14, 10:37 AM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 33 min |
| Sep 14, 11:13 AM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 32 min |
| Sep 14, 12:19 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 46 min |
| Sep 14, 12:41 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 34 min |
| Sep 14, 1:00 PM MST | Severe Thunderstorm Warning | FGZ | Gila | 50 min |
| Sep 14, 1:10 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 35 min |
| Sep 14, 1:20 PM MST | Tornado Warning | FGZ | Yavapai | 35 min |
| Sep 14, 1:32 PM MST | Severe Thunderstorm Warning | FGZ | Coconino, Gila | 48 min |
| Sep 14, 1:45 PM MST | Severe Thunderstorm Warning | FGZ | Navajo | 50 min |
| Sep 14, 1:48 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 62 min |
| Sep 14, 3:35 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 45 min |
| Sep 14, 3:58 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 47 min |
| Sep 14, 4:02 PM MST | Tornado Warning | FGZ | Yavapai | 33 min |
| Sep 14, 4:39 PM MST | Severe Thunderstorm Warning | FGZ | Yavapai | 36 min |
Nearby
Tornado Warnings in Arizona, 1999Every tornado warning in 1999Tornadoes 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; verification from NCEI's Storm Data; the sounding from the Mesonet's radiosonde archive.