Alert archive / Iowa / Flash Flood Warnings in 1993
Flash Flood Warning 87, NWS Des Moines, IA
NWS Des Moines, IA issued this flash flood warning at Jul 31, 1993, 6:19 AM CDT for Benton County, Linn County, Iowa. It was in force for 56 min.
The area
The counties it named.
The facts
- Issued
- Jul 31, 1993, 6:19 AM CDT (11:19 UTC)
- Expired
- Jul 31, 1993, 7:15 AM CDT
- In force
- 56 min
- Issued by
- NWS Des Moines, IA
- Area
- Whole counties
Counties Benton County, IA, Linn County, IA
The nearest sounding before it
Minneapolis, MN (KSTC), launched 00:00Z, 11.3 hours before the alert went out and 339 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
- 1153 J/kg
- Mixed-layer CIN
- -243 J/kg
- Mixed-layer LCL
- 1041 m above ground
- 0-6 km bulk shear
- 29 kt
- 0-1 km storm-relative helicity
- 80 m²/s²
- 0-3 km storm-relative helicity
- 246 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 KDSM 311121 FFWDSM IAC011-113-311215- BULLETIN - EBS ACTIVATION REQUESTED SEVERE THUNDERSTORM AND FLASH FLOOD WARNING NATIONAL WEATHER SERVICE DES MOINES IA 619 AM CDT SAT JUL 31 1993 THE NATIONAL WEATHER SERVICE IN DES MOINES HAS ISSUED A SEVERE THUNDERSTORM AND FLASH FLOOD WARNING EFFECTIVE UNTIL 715 AM CDT FOR PEOPLE IN THE FOLLOWING LOCATION... IN EAST CENTRAL IOWA ...NORTHERN BENTON COUNTY...LINN COUNTY AT 615 AM CDT RADAR INDICATED A SEVERE THUNDERSTORM OVER NORTHERN BENTON COUNTY...10 MILES NORTHEAST OF VINTON...OR 20 MILES NORTHWEST OF CEDAR RAPIDS. THIS STORM WAS LOCATED ALONG THE CEDAR RIVER FROM WATERLOO TO CEDAR RAPIDS...AND HAS THE POTENTIAL TO PRODUCE TORRENTIAL RAIN OVER THE NEXT 2 HOURS. THE CEDAR RIVER AND ITS TRIBUTARIES...INCLUDING THE BLUE CREEK...AND WEST AND EAST OTTER CREEKS ARE ESPECIALLY VULNERABLE THIS MORNING. IF YOU ARE CAUGHT OUTSIDE...SEEK SHELTER FROM THE WEATHER IN A STRONG BUILDING. DAMAGING WIND...~LARGE HAIL...VERY HEAVY RAIN... AND DEADLY LIGHTNING ARE ALL POSSIBLE IN SEVERE THUNDERSTORMS. STAY INSIDE AWAY FROM WINDOWS UNTIL THE STORM HAS PASSED. LEWIS
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, Jul 31, 2:45 AM CDT, 3 hours 34 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-310845- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 243 AM CDT SAT JUL 31 1993 ...ISOLATED STRONG THUNDERSTORMS ARE DEVELOPING IN NORTH CENTRAL IOWA... AT 240 AM CDT...AN ISOLATED STRONG THUNDERSTORM HAD DEVELOPED NEAR THE IOWA/MINNESOTA BORDER 3 MILES SOUTH OF NORTHWOOD. IN ADDITION... SCATTERED SHOWERS AND THUNDERSTORMS WERE DEVELOPING ALONG THE HIGHWAY 218 CORRIDOR FROM NEAR WAVERLY TO NORTHWOOD. THROUGH 340 AM CDT...THESE STORMS WILL MOVE INTO THE ST. ANSGAR...OSAGE...CHARLES CITY AND NASHUA AREAS AND COULD PRODUCE BRIEF HEAVY RAINS...STRONG GUSTY WINDAND DEADLY LIGHTNING. OTHERWISE...CLOUDS WILL STEADILY THICKEN ACROSS THE REST OF NORTHEAST ANNORTH CENTRAL IOWA THROUGH THE NIGHTTIME HOURS WITH THE CHANCE OF WIDELY SCATTERED SHOWERS AND THUNDERSTORMS CONTINUING. THE MERCURY IS EXPECTED TO HOLD STEADY IN THE MIDDLE 70S WITH THE WInNDS REMAINING SOUTH TO SOUTHEAST AT 5 TO 10 MILES AN HOUR. TRS
Special weather statement, Jul 31, 2:47 AM CDT, 3 hours 32 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-310845- SPECIAL WEATHER STATEMENT...CORRECTION FOR TEXT NATIONAL WEATHER SERVICE WATERLOO IA 243 AM CDT SAT JUL 31 1993 ...ISOLATED STRONG THUNDERSTORMS ARE DEVELOPING IN NORTH CENTRAL IOWA... AT 240 AM CDT...AN ISOLATED STRONG THUNDERSTORM HAD DEVELOPED NEAR THE IOWA/MINNESOTA BORDER 3 MILES SOUTH OF NORTHWOOD. IN ADDITION... SCATTERED SHOWERS AND THUNDERSTORMS WERE DEVELOPING ALONG THE HIGHWAY 218 CORRIDOR FROM NEAR WAVERLY TO NORTHWOOD. THROUGH 340 AM CDT...THESE STORMS WILL MOVE INTO THE ST. ANSGAR...OSAGE...CHARLES CITY AND NASHUA AREAS AND COULD PRODUCE BRIEF HEAVY RAINS...STRONG GUSTY WINDS AND DEADLY LIGHTNING. OTHERWISE...CLOUDS WILL STEADILY THICKEN ACROSS THE REST OF NORTHEAST AND NORTH CENTRAL IOWA THROUGH THE NIGHTTIME HOURS WITH THE CHANCE OF WIDELY SCATTERED SHOWERS AND THUNDERSTORMS CONTINUING. THE MERCURY IS EXPECTED TO HOLD STEADY IN rTHE MIDDLE 70S WITH THE WINDS REMAINING SOUTH TO SOUTHEAST AT 5 TO 10 MILES AN HOUR. TRS
Special weather statement, Jul 31, 4:28 AM CDT, 1 hour 51 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-311030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 428 AM CDT SAT JUL 31 1993 ...SCATTERED STRONG THUNDERSTORMS ARE MOVING INTO THE WATERLOO/CEDAR FALLS AREA EARLY THIS MORNING... AT 430 AM CDT...SHOWERS AND SCATTERED STRONG THUNDERSTORMS HAD DEVELOPED IN THE WATERLOO/CEDAR FALLS AREAS AND CONTINUED ALONG THE HIGHWAY 218 CORRIDOR. THROUGH 530 AM CDT...THESE SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE WATERLOO METRO AREA IN ADDITION TO CHARLES CITY...NASHUA...PLAINFILED...WAVERLY AND LA PORTE CITY. THESE THUNDERSTORMS WILL PRODUCE BRIEF HEAVY RAINS...STRONG GUSTY WINDS AND FREQUENT DEADLY LIGHTNING. THROUGH THE EARLY MORNING HOURS...NORTHEAST AND NORTH CENTRAL IOWA WILL SEE THE SCATTERED SHOWERS AND THUNDERSTORMS CONTINUING ALONG AND TO THE EAST OF HIGHWAY 218. THE TEMPERATURES WILL HOLD STEADY IN THE LOWER TO MIDDLE 70S WITH THE WINDS REMAINING SOUTH TO SOUTHEAST AT 5 TO 15 MILES AN HOUR. THE PUBLIC IS ADVISED TO STAY TUNED TO NOAA WEATHER RADIO...OR THEIR LOCAL TV OR RADIO BROADCASTS FOR ADDITIONAL STATEMENTS AND WEATHER UPDATES. TRS
Special weather statement, Jul 31, 4:29 AM CDT, 1 hour 50 minutes before
IAZ006-007-008-009-010-011-016-017-018-019-026-027-028-029-038- 039-040-311030- SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE WATERLOO IA 428 AM CDT SAT JUL 31 1993 ...SCATTERED STRONG THUNDERSTORMS ARE MOVING INTO THE WATERLOO/CEDAR FALLS AREA EARLY THIS MORNING... AT 430 AM CDT...SHOWERS AND SCATTERED STRONG THUNDERSTORMS HAD DEVELOPED IN THE WATERLOO/CEDAR FALLS AREAS AND CONTINUED ALONG THE HIGHWAY 218 CORRIDOR. THROUGH 530 AM CDT...THESE SHOWERS AND THUNDERSTORMS WILL CONTINUE TO AFFECT THE WATERLOO METRO AREA IN ADDITION TO CHARLES CITY...NASHUA...PLAINFILED...WAVERLY AND LA PORTE CITY. THESE THUNDERSTORMS WILL PRODUCE BRIEF HEAVY RAINS...STRONG GUSTY WINDS AND FREQUENT DEADLY LIGHTNING. THROUGH THE EARLY MORNING HOURS...NORTHEAST AND NORTH CENTRAL IOWA WILL SEE THE SCATTERED SHOWERS AND THUNDERSTORMS CONTINUING ALONG AND TO THE EAST OF HIGHWAY 218. THE TEMPERATURES WILL HOLD STEADY IN THE LOWER TO MIDDLE 70^S WITH THE WINDS REMAINING SOUTH TO SOUTHEAST AT 5 TO 15 MILES AN HOUR. THE PUBLIC IS ADVISED TO STAY TUNED TO NOAA WEATHER RADIO...OR THEIR LOCAL TV OR RADIO BROADCASTS FOR ADDITIONAL STATEMENTS AND WEATHER UPDATES. TRS
Special weather statement, Jul 31, 5:47 AM CDT, 32 minutes before
IAZALL-311145- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 547 AM CDT SAT JUL 31 1993 AT 531 AM CDT...VERY STRONG AND INTENSE THUNDERSTORMS CONTINUED OVER NORTHEAST AND SOUTHEAST IOWA. THE STRONGEST STORMS WERE LOCATED NEAR WATERLOO AND 5 TO 10 MILES SOUTHEAST OF WATERLOO. THESE STORMS...IN ADDITION TO PRODUCING TORRENTIAL DOWNPOURS...CAN CONTAIN LARGE HAIL... DAMAGING WIND...AND DEADLY LIGHTNING. PERSONS IN THE PATH OF THESE STORMS SHOULD MONITOR LOCAL RADIO BROADCASTS AND MOVE TO A PLACE OF SHELTER IF THREATENING WEATHER APPROACHES. OTHER VERY STRONG THUNDERSTORMS WERE SCATTERED OVER SOUTHEAST IOWA 10 TO 20 MILES SOUTHEAST OF OTTUMWA. THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 20 MILES AN HOUR. MILLER
Special weather statement, Jul 31, 5:47 AM CDT, 32 minutes before
IAZALL-311145- SPECIAL WEATHER STATEMENT AND RADAR SUMMARY NATIONAL WEATHER SERVICE DES MOINES IA 547 AM CDT SAT JUL 31 1993 AT 531 AM CDT...VERY STRONG AND INTENSE THUNDERSTORMS CONTINUED OVER NORTHEAST AND SOUTHEAST IOWA. THE STRONGEST STORMS WERE LOCATED NEAR WATERLOO AND 5 TO 10 MILES SOUTHEAST OF WATERLOO. THESE STORMS...IN ADDITION TO PRODUCING TORRENTIAL DOWNPOURS...CAN CONTAIN LARGE HAIL... DAMAGING WIND...AND DEADLY LIGHTNING. PERSONS IN THE PATH OF THESE STORMS SHOULD MONITOR LOCAL RADIO BROADCASTS AND MOVE TO A PLACE OF SHELTER IF THREATENING WEATHER APPROACHES. OTHER VERY STRONG THUNDERSTORMS WERE SCATTERED OVER SOUTHEAST IOWA 10 TO 20 MILES SOUTHEAST OF OTTUMWA. THE THUNDERSTORMS WERE MOVING SOUTHEAST AT 20 MILES AN HOUR. MILLER
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 31, 5:08 AM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 52 min |
| Jul 31, 6:19 AM CDT | Severe Thunderstorm Warning | DMX | Benton, Linn | 56 min |
| Jul 31, 7:05 AM CDT | Severe Thunderstorm Warning | DMX | Benton | 45 min |
| Jul 31, 7:23 AM CDT | Flash Flood Warning | DMX | Benton | 3 hr |
| Jul 31, 7:40 AM CDT | Severe Thunderstorm Warning | DMX | Linn | 35 min |
| Jul 31, 8:15 AM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo | 45 min |
| Jul 31, 8:25 AM CDT | Severe Thunderstorm Warning | DMX | Franklin | 65 min |
| Jul 31, 8:56 AM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Hardin | 34 min |
| Jul 31, 9:10 AM CDT | Severe Thunderstorm Warning | DMX | Chickasaw | 27 min |
| Jul 31, 9:19 AM CDT | Severe Thunderstorm Warning | DMX | Greene | 41 min |
| Jul 31, 9:30 AM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Hardin | 60 min |
| Jul 31, 9:51 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Webster | 44 min |
| Jul 31, 10:42 AM CDT | Severe Thunderstorm Warning | DMX | Story | 27 min |
| Jul 31, 11:02 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall | 30 min |
| Jul 31, 11:12 AM CDT | Severe Thunderstorm Warning | DMX | Marion, Warren | 48 min |
| Jul 31, 11:38 AM CDT | Severe Thunderstorm Warning | DMX | Poweshiek, Tama | 33 min |
| Jul 31, 11:52 AM CDT | Severe Thunderstorm Warning | DMX | Wright | 52 min |
| Jul 31, 12:00 PM CDT | Severe Thunderstorm Warning | DMX | Benton, Iowa | 30 min |
| Jul 31, 12:08 PM CDT | Flash Flood Warning | DMX | Johnson, Linn | 67 min |
| Jul 31, 12:08 PM CDT | Severe Thunderstorm Warning | DMX | Johnson, Linn | 67 min |
| Jul 31, 12:16 PM CDT | Flash Flood Warning | DMX | Hardin | 59 min |
| Jul 31, 12:16 PM CDT | Severe Thunderstorm Warning | DMX | Hardin | 59 min |
Nearby
Flash Flood Warnings in Iowa, 1993Every flash flood warning in 1993
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.