Alert archive / Iowa / Flash Flood Warnings in 1990
Flash Flood Warning 1, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at May 18, 1990, 8:00 PM CDT for Crawford County, Iowa. It was in force for 60 min.
The area
The counties it named.
The facts
- Issued
- May 18, 1990, 8:00 PM CDT (01:00 UTC)
- Expired
- May 18, 1990, 9:00 PM CDT
- In force
- 60 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
County Crawford County, IA
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
Omaha, NE (KOAX), launched 00:00Z, 1.0 hours before the alert went out and 114 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
- 3572 m above ground
- 0-6 km bulk shear
- 53 kt
- 0-1 km storm-relative helicity
- 218 m²/s²
- 0-3 km storm-relative helicity
- 319 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted, in the capitals the NWS used until 2016.
000
TTAA00 KALO 190101
FFWDSM
IAC047-190200-
BULLETIN - EBS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE DES MOINES IA
ISSUED BY WATERLOO IA
800 PM CDT FRI MAY 18 1990
THE NATIONAL WEATHER SERVICE HAS ISSUED A
FLASH FLOOD WARNING EFFECTIVE UNTIL 900 PM CDT
FOR PEOPLE IN THE FOLLOWING COUNTY...
IN WEST CENTRAL IOWA
...CRAWFORD
HEAVY RAIN HAS FALLEN IN CRAWFORD COUNTY. 21/2 INCHES OF RAIN FELL
IN ABOUT 1/2 HOUR WITH PEA SIZE HAIL. THE CITY OF DENISON HAS MUCH
STREET AND SMALL STREAM FLOODING. THE TOWN OF RICKETTS ABOUT 10 MILES
NORTHWEST OF DENISON HAS SMALL STREAM FLOODING OVER THE ROADS. THIS
IS A DANGEROUS SITUATION.
PEOPLE IN CRAWFORD COUNTY IN IOWA SHOULD TAKE IMMEDIATE ACTION FOR
THE NEXT HOUR UNTIL THE STREAMS GO BACK WITHIN THEIR BANKS. DO NOT
TRY TO CROSS ROADWAYS THAT ARE COVERED WITH WATER. FLOODING WATER
OVER ROADWAY IS AN AWESOME POWER.
DO NOT ATTEMPT TO DRIVE THROUGH RISING FLOOD WATERS. IF YOU ARE
CAUGHT IN YOUR VEHICLE IN RISING FLOOD WATERS...ABANDON IT
IMMEDIATELY AND MOVE TO HIGHER GROUND.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, May 18, 6:12 PM CDT, 1 hour 48 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 610 PM CDT FRI MAY 18 1990 ...TORNADO WATCH IN EFFECT FOR SMALL PART OF NORTHWEST IOWA UNTIL MIDNIGHT... SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS CONTINUED ACROSS THE WEST CENTRAL AND NORTHWEST COUNTIES OF IOWA. THE STRONGEST STORMS WERE IN NORTHERN MONONA COUNTY...ABOUT MIDWAY BETWEEN SIOUX CITY AND OMAHA/ COUNCIL BLUFFS. MOVEMENT WAS EAST AT 35 MILES AN HOUR. BETWEEN 8 6AND 9 PM THE LEADING EDGE OF THE SHOWERS AND STORMS WILL BE ALONG A FORT DODGE...OMAHA/COUNCIL BLUFFS LINE. KS
Special weather statement, May 18, 6:41 PM CDT, 1 hour 19 minutes before
IAZALL-190100- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 640 PM CDT FRI MAY 18 1990 AT 632 PM...NUMEROUS SHOWERS AND WIDELY SCATTERED THUNDERSTORMS WERE OVER WEST CENTRAL AND NORTHWEST IOWA. THE RAINFALL WAS WEST OF AN OMAHA/COUNCIL BLUFFS...MASON CITY LINE. THE STRONGEST STORMS WERE ACROSS MONONA COUNTY...ABOUT MIDWAY BETWEEN SIOUX CITY AND OAMHA/COUNCIL BLUFFS. ALONG THE THE BRIEF HEAVY RAINS ...PEA hSIZE HAIL WAS OCCURRING WITH THESE STORMS. THE SHOWERS AND STORMS WERE MOVING EAST AT 35 MILES AN HOUR. KS
Special weather statement, May 18, 6:45 PM CDT, 1 hour 15 minutes before
IAZALL-190100- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY ...HEADLINE WATCH... NATIONAL WEATHER SERVICE DES MOINES IA 640 PM CDT FRI MAY 18 1990 ...TORNADO WATCH IN EFFECT FOR SMALL PART OF NORTHWEST IOWA UNTIL MIDNIGHT... AT 632 PM...NUMEROUS SHOWERS AND WIDELY SCATTERED THUNDERSTORMS WERE OVER WEST CENTRAL AND NORTHWEST IOWA. THE RAINFALL WAS WEST OF AN OMAHA/COUNCIL BLUFFS...MASON CITY LINE. THE STRONGEST STORMS WERE ACROSS MONONA COnUNTY...ABOUT MIDWAY BETWEEN SIOUX CITY AND OMAHA/COUNCIL BLUFFS. ALONG THE THE BRIEF HEAVY RAINS ...PEA SIZE HAIL WAS OCCURRING WITH THESE STORMS. THE SHOWERS AND STORMS WERE MOVING EAST AT 35 MILES AN HOUR. KS
Special weather statement, May 18, 7:09 PM CDT, 51 minutes before
IAZALL-190200- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 710 PM CDT FRI MAY 18 1990 ...TORNADO WATCH IN EFFECT FOR SMALL PART OF NORTHWEST IOWA UNTIL MIDNIGHT... AT 705 PM...NUMEROUS SHOWERS AND WIDELY SCATTERED THUNDERSTORMS WERE ACROSS THE NORTHWEST QUARTER OF IOWA...NORTHWEST OF AN OMAHA/COUNCIL BLUFFS...MASON CITY LINE. THE STRONGEST STORMS...PRODUCING HEAVY RAINS AND PEA SIZE HAIL...WERE APPROACHING DENISON...50 M ILES SOUTHEAST OF SIOUX CITY. THE SHOWERS AND STORMS WERE MOVING EAST AT 35 MILES AN HOUR. KS
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| May 18, 8:28 PM CDT | Severe Thunderstorm Warning | DMX | Carroll | 47 min |
| May 18, 9:16 PM CDT | Severe Thunderstorm Warning | DMX | Greene | 44 min |
| May 18, 10:06 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas | 41 min |
Nearby
Flash Flood Warnings in Iowa, 1990Every flash flood warning in 1990
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.