Flash Flood Warning 3, NWS Missoula, MT

Issued

Aug 20, 1990, 11:52 PM MDT (05:52 UTC)

Expired

Aug 21, 1990, 2:00 AM MDT

In force

2 hr

Issued by

NWS Missoula, MT

Area

Whole counties

County Lewis and Clark County, MT

The WSR-88D network and its archive begin in 1991, so there is no radar volume for this alert.

000 
TTAA00 KHLN 210551
FFWHLN
MTC049-210800-
 
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE HELENA MT
1152 PM MDT MON AUG 20 1990
 
THE NATIONAL WEATHER SERVICE IN HELENA MT     HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL  200 AM MDT
FOR PEOPLE IN THE FOLLOWING LOCATION...
 
IN SOUTHWEST MONTANA
 
   ...CENTRAL LEWIS AND CLARK COUNTY
 
AT 11:45 PM MDT...THE HELENA MONTANA CITY POLICE DEPARTMENT REPORTED
THAT MANY STREETS AND ROADS WERE FLOODED IN THE CITY OF HELENA IN
LEWIS AND CLARK COUNTY OF MONTANA.
 
A SEVERE THUNDERSTORM THAT MOVED THROUGH THE CITY OF HELENA AT 11:10
PM MDT DROPPED OVER ONE-HALF OF AN INCH OF RAIN IN A 15 MINUTE PERIOD.
 
OVER TWO FEET OF WATER ON SOME ROADS HAS STRANDED MOTORISTS.
 
THE THUNDERSTORM IS MOVING NORTHEAST AWAY FROM THE CITY OF HELENA
AND TOWARD NORTHERN LEWIS AND CLARK COUNTY OF MONTANA.
 
 
BE ESPECIALLY CAUTIOUS AT NIGHT WHEN IT IS HARDER TO RECOGNIZE
THE DANGERS OF FLOODS AND FLASH FLOODS.  IF FLASH FLOODING IS
OBSERVED...ACT QUICKLY.  MOVE UP TO ESCAPE FLOOD WATERS.  DO
NOT STAY IN AREAS SUBJECT TO FLOODING WHEN WATER BEGINS RISING.
 
DO NOT DRIVE YOUR VEHICLE INTO AREAS WHERE THE WATER COVERS THE
ROADWAY.  THE WATER DEPTH MAY BE TOO GREAT TO ALLOW YOUR CAR TO
CROSS SAFELY.  VEHICLES CAUGHT IN RISING WATER SHOULD BE
ABANDONED QUICKLY.  MOVE TO HIGHER GROUND.
 
A FLASH FLOOD WARNING MEANS THAT FLOODING IS IMMINENT.  IT'S
IMPORTANT TO KNOW WHERE YOU ARE RELATIVE TO STREAMS...RIVERS...OR
CREEKS WHICH CAN BECOME KILLERS IN HEAVY RAINS.  CAMPERS SHOULD
AVOID CAMPING ALONG STREAMS OR CREEKS DURING THREATENING RAINS.

In the hours before

MTZ001-002-210330-

SPECIAL WEATHER STATEMENT
NATIONAL WEATHER SERVICE MISSOULA MT
730 PM MDT MON AUG 20 1990

...STRONG THUNDERSTORMS MOVING THROUGH WESTERN MONTANA...

AT 720 PM MDT...RADAR INDICATED SCATTERED THUNDERSTORMS WERE MOVING
THROUGH WESTERN MONTANA. THE STRONGEST OF THESE THUNDERSTORMS HAVE
MOVED INTO GRANITE AND RAVALLE COUNTIES DURING THE PAST HOUR...AND
ARE MOVING TO THE NORTH AT ABOUT 25 MILES AN HOUR.

THESE THUNDERSTORMS MAY CONTAIN STRONG GUSTY WINDS..BRIEF HEAVY RAIN..
FREQUENT LIGHTNING AND SMALL HAIL AND WILL CONTINUE THROUGH THIS EVENING.

FURTHER STATEMENTS WILL BE ISSUED IF NECESSARY.

END/RON

Flash Flood Warnings in Montana, 1990Every flash flood warning in 1990

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.