Alert archive / Utah / Severe Thunderstorm Warnings in 1991
Severe Thunderstorm Warning 21, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this severe thunderstorm warning at Aug 27, 1991, 6:47 PM MDT for Box Elder County, Tooele County, Utah. It was in force for 58 min.
The area
The counties it named.
The facts
- Issued
- Aug 27, 1991, 6:47 PM MDT (00:47 UTC)
- Expired
- Aug 27, 1991, 7:45 PM MDT
- In force
- 58 min
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties
Counties Box Elder County, UT, Tooele County, UT
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 00:00Z, 0.8 hours before the alert went out and 104 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1769 m above ground
- 0-6 km bulk shear
- 40 kt
- 0-1 km storm-relative helicity
- 192 m²/s²
- 0-3 km storm-relative helicity
- 246 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.1
The text
As transmitted, in the capitals the NWS used until 2016.
000 TTAA00 KSLC 280048 SVRSLC UTC003-045-280145- BULLETIN - IMMEDIATE BROADCAST REQUESTED SEVERE THUNDERSTORM WARNING NATIONAL WEATHER SERVICE SALT LAKE CITY UT 647 PM MDT TUE AUG 27 1991 THE NATIONAL WEATHER SERVICE IN SALT LAKE CITY HAS ISSUED A SEVERE THUNDERSTORM WARNING EFFECTIVE UNTIL 745 PM MDT FOR PEOPLE IN THE FOLLOWING LOCATIONS... IN NORTHWEST UTAH ...WESTERN BOX ELDER COUNTY...NORTHWESTERN TOOELE COUNTY A LINE OF THUNDERSTORMS MOVING THROUGH NORTHWEST TOOELE COUNTY INTO WESTERN BOX ELDER COUNTY ARE PRODUCING VERY STRONG WINDS. AT 628 PM AT THE WENDOVER AIRPORT AN AUTOMATIC WIND INSTRUMENT RECORDED A GUST TO 56 MPH FROM A NEARBY THUNDERSTORM. THE LINE OF THUNDERSTORMS IS MOVING TOWARDS THE NORTHEAST AND EVEN THOUGH PARTS OF THE COUNTIES MENTIONED HAVE SPARSE POPULATION...RESIDENTS OR TRAVELERS SHOULD BE VERY CAUTIOUS AND TAKE SHELTER WHEN STORMS APPROACH. SEVERE THUNDERSTORMS PRODUCE DAMAGING WIND IN EXCESS OF 55 MPH...DESTRUCTIjVE HAIL...DEADLY LIGHTNING...AND VERY HEAVY RAIN. FOR YOUR PROTECTION MOVE TO AN INTERIOR ROOM ON THE LOWEST FLOOR OF YOUR HOME OR BUSINESS. HEAVY RAINS FLOOD ROADS QUICKLY SO DON'T DRIVE INTO AREAS WHERE WATER COVERS THE ROAD. SMITH/0048Z..
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.
In the hours before
Special weather statement, Aug 27, 2:00 PM MDT, 4 hours 47 minutes before
UTZALL-280300-
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
200 PM MDT TUE AUG 27 1991
...SEVERE THUNDERSTORM WATCH UNTIL 9 PM MDT...
THE NATIONAL SEVERE STORMS FORECAST CENTER IN KANSAS CITY HAS ISSUED
A SEVERE THUNDERSTORM WATCH UNTIL 9 PM MDT THIS EVENING FOR NORTHWEST
UTAH EXTREME NORTHEAST NEVADA AND EASTERN IDAHO.
REMEMBER...A SEVERE THUNDERSTORM WATCH MEANS CONDITIONS ARE FAVORABLE
FOR SEVERE THUNDERSTORMS IN AND CLOSE TO THE WATCH AREA. SHOULD
CONDITIONS WARRANT...A SEVERE THUNDERSTORM WARNING WILL BE ISSUED.
SEVERE THUNDERSTORMS CAN PRODUCE STRONG WINDS AND LARGE HAIL. HEAVY
RAINFALL IS ALSO POSSIBLE WHICH CAN CAUSE LOCALIZED FLOODING
DEPENDING ON THE LOCATION. THESE STORMS ARE ALSO EXPECTED TO PRODUCE
FREQUENT LIGHTNING STRIKES.
LATEST LIGHTNING DETECTION CHARTS INDICATE AN ACTIVE AREA OF
THUNDERSHOWER CELLS MOVING INTO THE SOUTH END OF THE WASATCH FRONT.
NEARLY 50 CLOUD-TO-GROUND LIGHTNING STRIKES IN THE PERIOD FROM 1:15
TO 1:45 PM MDT. THIS AREA IS MOVING TO THE NORTH.
REMEMBER LIGHTNING IS A PROVEN KILLER. SO FAR THIS SUMMER 3 PEOPLE
IN UTAH HAVE BEEN KILLED BY LIGHTNING AND 4 HAVE BEEN INJURED. DON'T
ADD TO THESE FIGURES. TAKE PROPER PROTECTION TO AVOID BEING A HUMAN
LIGHTNING ROD.
PERSONS IN THE WATCH AREA SHOULD BE ON THE LOOKOUT FOR THREATENING
WEATHER CONDITIONS AND LISTEN FOR LATER STATEMENTS. SHOULD SEVERE
WEATHER OCCUR IN YOUR AREA REPORT IT TO THE NEAREzST LAW ENFORCEMENT
AGENCY OR THE NATIONAL WEATHER SERVICE.
FURTHER STATEMENTS WILL BE ISSUED AS NEEDED.
DJ/WJA 2000Z....Special weather statement, Aug 27, 5:45 PM MDT, 1 hour 2 minutes before
UTZALL-280200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 545 PM MDT TUE AUG 27 1991 ...SEVERE THUNDERSTORM WATCH AND URBAN AND SMALL STREAM FLOODING ADVISORY UNTIL 9 PM MDT... A SEVERE THUNDERSTORM WATCH FOR NORTHWEST UTAH REMAINS IN EFFECT UNTIL 9 PM TONIGHT. A WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS. ALSO AN URBAN AND SMALL STREAM FLOODING ADVISORY FOR THE WASATCH FRONT AND CACHE VALLEY REMAINS IN EFFECT UNTIL 9 PM TONIGHT. AN APPROACHING UPPER AIR WEATHER SYSTEM HAS PUSHED A COLD FRONT TO THE NEVADA UTAH BORDER. THUNDERSTORMS ALONG AND AHEAD OF THE COLD FRONT WILL SWING THROUGH NORTHWEST UTAH THIS EVENING BRINGING THE POTENTIAL FOR VERY STRONG WINDS...LARGE HAIL...AND HEAVY RAIN. RESIDENTS AND TRAVELERS THROUGH NORTHWEST UTAH NEED TO REMAIN ALERT FOR POTENTIALLY DANGEROUS WEATHER CONDITIONS INCLUDING FREQUENT LIGHTNING. IF POSSIBLE SEEK SHELTER INDOORS WHEN STORMS APPROACH AND NEVER ATTEMPT TO CROSS FLOODED ROADS IN YOUR CAR. BRIEF HEAVY RAINS ASSOCIATED WITH THE THUNDERSTORMS WILL LIKELY CAUSE LOW LYING AREAS...SMALL STREAMS...AND STREET INTERSECTIONS TO FILL OR EVEN OVERFLOW. MOVE TO HIGHER GROUND OF WATERS RISE. THUNDERSTORMS HAVE ALSO DEVELOPED IN SOUTHERN AND EASTERN UTAH THIS AFTERNOON AND BRIEF HEAVY RAINS WITH STRONG GUSTY WINDS ARE ALSO POSSIBLE NEAR THUNDERSHOWERS IN THAT AREA. ADDITIONAL STATEMENTS WILL BE ISSUED ABOUT THIS DEVELOPING WEATHER SITUATION. SMITH/2345Z..
Special weather statement, Aug 27, 6:30 PM MDT, 17 minutes before
UTZALL-280300- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 630 PM MDT TUE AUG 27 1991 ...SEVERE THUNDERSTORM WATCH AND URBAN AND SMALL STREAM FLOODING ADVISORY UNTIL 9 PM MDT... A SEVERE THUNDERSTORM WATCH FOR NORTHWEST UTAH REMAINS IN EFFECT UNTIL 9 PM TONIGHT. A WATCH MEANS THAT CONDITIONS ARE FAVORABLE FOR THE DEVELOPMENT OF SEVERE THUNDERSTORMS. ALSO AN URBAN AND SMALL STREAM FLOODING ADVISORY FOR THE WASATCH FRONT AND CACHE VALLEY REMAINS IN EFFECT UNTIL 9 PM TONIGHT. AT 615 PM A LINE OF THUNDERSTORMS WAS DEVELOPING FROM NORTHWEST OF DELTA TO THE NORTHWEST CORNER OF THE STATE. THIS PUTS THE LINE OF THUNDERSTORMS ABOUT 75 MILES FROM THE WASATCH FRONT AND PRESENT MOVEMENT WOULD BRING THESE THUNDERSTORMS TO THE WASATCH FRONT BETWEEN 8 AND 9 PM TONIGHT. THERE WERE ALSO SOME STRONG THUNDERSTORMS MOVING THROUGH THE NORTHEAST PART OF THE STATE WITHIN THE LAST HOUR. RAINFALL IN UINTAH COUNTY WAS GENERALLY .15 OF AN INCH TO .40 OF AN INCH WITHIN 30 MINUTES TIME. ONE OBSERVER 12 MILES EAST OF MYTON RECEIVED .90 OF AN INCH BETWEEN 530 AND 600 PM. THERE WAS NO FLOODING REPORTED IN THE AREA. RESIDENTS AND TRAVELERS THROUGH NORTHERN UTAH NEED TO REMAIN ALERT FOR POTENTIALLY DANGEROUS WEATHER CONDITIONS INCLUDING FREQUENT LIGHTNING. IF POSSIBLE SEEK SHELTER INDOORS WHEN STORMS APPROACH AND NEVER ATTEMPT TO CROSS FLOODED ROADS IN YOUR CAR. BRIEF HEAVY RAINS ASSOCIATED WITH THE THUNDERSTORMS WILL LIKELY CAUSE LOW LYING AREAS...SMALL STREAMS...AND STREET INTERSECTIONS TO FILL OR EVEN OVERFLOW. MOVE TO HIGHER GROUND IF WATERS RISE. ADDITIONAL STATEMENTS WILL BE ISSUED ABOUT THIS DEVELOPING WEATHER SITUATION. SMITH/0030Z..
Nearby
Severe Thunderstorm Warnings in Utah, 1991Every severe thunderstorm warning in 1991
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.