Alert archive / Utah / Flash Flood Warnings in 1986
Flash Flood Warning 7, NWS Salt Lake City, UT
NWS Salt Lake City, UT issued this flash flood warning at Aug 20, 1986, 8:28 PM MDT for 5 counties in Utah. It was in force for 3 hr.
The area
The counties it named.
The facts
- Issued
- Aug 20, 1986, 8:28 PM MDT (02:28 UTC)
- Expired
- Aug 20, 1986, 11:00 PM MDT
- In force
- 3 hr
- Issued by
- NWS Salt Lake City, UT
- Area
- Whole counties
Counties Davis County, UT, Morgan County, UT, Salt Lake County, UT, Tooele County, UT, Weber County, UT
The radar
The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.
The nearest sounding before it
Salt Lake City I, UT (KSLC), launched 00:00Z, 2.5 hours before the alert went out and 23 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
- 143 J/kg
- Mixed-layer CIN
- -87 J/kg
- Mixed-layer LCL
- 2326 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 61 m²/s²
- 0-3 km storm-relative helicity
- 73 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.7
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAAOO KSLC 210228
FFWSLC
UTC051-011-029-033-035-043-057-045-210630-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
828 PM MDT WED AUG 20 1986
THE NATIONAL WEATHER SERVICE HAS ISSUED A FLASH FLOOD WARNING
EFFECTIVE UNTIL 1100 PM MDT FOR PEOPLE IN THE FOLLOWING COUNTIES:
IN NORTHERN UTAH
..DAVIS..MORGAN..SOUTHERN RICH
..SALT LAKE..WESTERN SUMMIT..WEBER
..NORTHERN WASATCH..EASTERN TOOELE
A FLASH FLOOD WARNING MEANS THAT FLOODING IS OCCURRING OR IS
IMMINENT. MOST FLASH FLOOD DEATHS OCCUR IN AUTOMOBILES. DO NOT
ATTEMPT TO CROSS BRIDGES, DIPS, OR LOW SPOTS IF WATER COVERS THE
ROADWAY. NEVER TRY TO CROSS A FLOWING STREAM, EVEN A SMALL ONE,
ON FOOT. TO ESCAPE RISING WATER MOVE UP TO HIGHER GROUND.
HEAVY RAIN HAS BEEN REPORTED IN MANY AREAS OF NORTHWEST AND
NORTHCENTRAL UTAH THIS EVENING WITH A HALF INCH TO AN INCH OCCURING
WITHIN A SHORT PERIOD OF TIME. ADDITIONAL MODERATE TO BRIEF HEAVY
RAINS ARE LIKELY AND WILL ACCELERATE THE RUNOFF OF WATER OFF OF
ALREADY SATURATED GROUND.
MUDSLIDES AREA ALSO POSSIBLE IN THIS SITUATION...ESPECIALLY UP THE
CANYONS. EXTREME CAUTION SHOULD BE TAKEN FOR THOSE VENTURING OUT
WITHIN THE NEXT FEW HOURS.What forecasters said that day
The local office's own words before this flash flood 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 20, 2:36 PM MDT, 5 hours 52 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE SALT LAKE CITY UT 235 PM MDT WED AUG 20 1986 ..AN ACTIVE THUNDERSHOWER DAY LIKELY IN THE NORTHWEST HALF OF UTAH.. THUNDERSHOWERS ARE ON THE INCREASE OVER UTAH AND WILL BECOME SCATTERED TO NUMEROUS THE REMAINDER OF THE AFTERNOON UNTIL ABOUT MIDNIGHT IN THE NORTHWEST HALF OF THE STATE. IN AN AREA NORTH OF A LINE FROM THE UINTA MOUNTAINS TO ABOUT BRYCE CANYON SHOULD BE THE MOST ACTIVE AREA OF THUNDERSHOWERS. MODERATE TO LOCALLY HEAVY RAINS ARE POSSIBLE FROM THESE THUNDERSHOWERS AND BRIEF GUSTY WINDS TO ABOUT 35 MPH. SOME SMALL HAIL IS ALSO POSSIBLE FROM THE MORE ACTIVE CELLS. FREQUENT LIGHTNING WILL BE ASSOCIATED WITH THESE SHOWERS. REMEMBER.. LIGHTNING IS UNFORGIVING AND A KILLER. TAKE PROPER PROTECTION IS LIGHTNING IS IN THE AREA.. DON`T BE A HUMAN LIGHTNING ROD. MALES IN THEIR TEENS AND 20S AND IN AN OPEN AREA ARE THE MOST LIKELY LIGHTNING CANDIDATES. ADDITIONAL STATEMENTS WILL BE ISSUED AS THE AFTERNOON PROGRESSES. KML/WJA 2040Z....
Special weather statement, Aug 20, 6:00 PM MDT, 2 hours 28 minutes before
SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE SALT LAKE CITY UT
600 PM MDT WED AUG 20 1986
...THUNDERSHOWERS RUMBLING IN FORCE...
THUNDERSHOWERS HAVE BECOME NUMEROUS OVER MUCH OF UTAH.
A FEW OF THESE HAVE PRODUCED BRIEF HEAVY RAIN IN THE SOUTHWESTERN
AND SOUTHCENTRAL PORTIONS OF THE STATE. SOME AMOUNTS REPORTED SINCE
THE MIDDLE OF THE AFTERNOON INCLUDE...A HALF INCH IN 35 MINUTES AT
PANGUITCH...0.44 IN 20 MINUTES AT LOA...0.48 IN 10 MINUTES AT SIGURD
...AND 0.70 AT GLENWOOD IN A HALF HOUR ALONG WITH PEA SIZED HAIL.
MODERATE TO LOCALLY HEAVY RAIN IS ALSO POSSIBLE IN THE NORTHERN
PORTION OF THE STATE AS WELL AS THE SOUTHWEST THROUGH THIS EVENING.
STRONG GUSTY WINDS...HAIL...AND FREQUENT LIGHTNING ARE POSSIBLE
FROM THESE THUNDERSTORMS. WIND GUSTS TO 33 MPH HAVE OCCURRED
AT THE PRICE AIRPORT AND TO 28 MPH AT THE WENDOVER AIRPORT.
SOME OF THE MORE INTENSE THUNDERSTORMS HAVE BEEN PRODUCING
MORE THAN ONE CLOUD TO GROUND LIGHTNING STRIKE PER MINUTE.
PERSONS IN UTAH SHOULD BE ALERT TO RAPIDLY CHANGING WEATHER AND BE
PREPARED TO MOVE TO A PLACE OF SAFETY IF THREATING WEATHER DEVELOPS.
REMEMBER...LIGHTNING IS AN UNFORGIVING KILLER.
FURTHER STATEMENTS WILL BE ISSUED ASe NEEDED.
JRP...2359ZThe office that day
Everything else NWS Salt Lake City, UT issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 20, 8:28 PM MDT | Flash Flood Warning | SLC | Summit, Wasatch | 3 hr |
| Aug 20, 8:28 PM MDT | Flash Flood Warning | SLC | Rich | 3 hr |
Nearby
Flash Flood Warnings in Utah, 1986Every flash flood warning in 1986
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.