Alert archive / Iowa / Severe Thunderstorm Warnings in 2013
Severe Thunderstorm Warning 181, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 21, 2013, 4:11 PM CDT for Audubon County, Guthrie County, Iowa. It was in force for 34 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jul 21, 2013, 4:11 PM CDT (21:11 UTC)
- Expired
- Jul 21, 2013, 4:45 PM CDT
- In force
- 34 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Audubon County, IA, Guthrie County, IA
The radar
The Des Moines radar (KDMX), 82 km from the middle of the area, began a volume at 21:14 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 9.2 hours before the alert went out and 145 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
- 571 J/kg
- Mixed-layer CIN
- -201 J/kg
- Mixed-layer LCL
- 863 m above ground
- 0-6 km bulk shear
- 17 kt
- 0-1 km storm-relative helicity
- 16 m²/s²
- 0-3 km storm-relative helicity
- 121 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
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.
NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jul 21, 3:26 PM CDT, 45 minutes earlier.
Area forecast discussion, Jul 21, 3:26 PM CDT, 45 minutes before
AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE DES MOINES IA 326 PM CDT SUN JUL 21 2013 .SHORT TERM.../TONIGHT /... ISSUED AT 326 PM CDT SUN JUL 21 2013 MCV CONTINUES TO MOVE SOUTHEAST OUT OF AREA TAKING LOCALLY HEAVY RAINFALL WITH IT AT THIS TIME. THE REMAINDER OF THE EVENING HOURS SHOULD REMAIN GENERALLY DRY THOUGH THERE MAY BE AN ISOLATED SHOWER OR THUNDERSTORM WEST OF THE REGION THROUGH EARLY EVENING. OVERNIGHT PATCHY FOG IS EXPECTED TO DEVELOP ACROSS THE REGION...ESPECIALLY WHERE RAIN FELL THIS AFTERNOON. HAVE ADDED AREAS FOG IN THE SOUTH AND SOUTHEAST WHERE UP TO 3.5 INCHES OF RAIN WAS REPORTED WITH THE MCV. WINDS WILL REMAIN LIGHT THIS AFTERNOON AND EVENING WHICH SHOULD PROMOTE FOG DEVELOPMENT. ACROSS THE METRO...NOT LOOKING FOR AS GREAT A CHANCE OF FOG DEVELOPMENT. LOWS WILL DROP INTO THE 60S OVER THE AREA WITH GENERALLY PARTLY CLOUDY CONDITIONS. .LONG TERM.../MONDAY THROUGH SUNDAY/... ISSUED AT 326 PM CDT SUN JUL 21 2013 THE LONG TERM FORECAST REMAINS CHARACTERIZED BY NORTHWESTERLY FLOW ALOFT...WITH SEVERAL SHORTWAVES MOVING THROUGH THAT WILL PUSH ALTERNATING SURFACE TROUGHS AND HIGH PRESSURE AREAS THROUGH IOWA IN THE COMING WEEK. THE MOST WELL DEFINED TROUGH IN THE NEXT SEVERAL DAYS WILL TRAVERSE THE AREA MONDAY AFTERNOON AND EVENING...LIKELY ACCOMPANIED BY A BROKEN BAND OF SHOWERS AND THUNDERSTORMS MOVING FROM NORTHWEST TO SOUTHEAST. FORCING WILL BE MODEST WITH THE MORE ROBUST LIFT OFF TO OUR NORTHEAST...AND LOW LEVEL CONVERGENCE LOOKS WEAK...BUT INSTABILITY AND MOISTURE ARE SUFFICIENT TO JUSTIFY THE EXPECTATION OF SCATTERED CONVECTION ASSOCIATED WITH THE TROUGH AND HAVE HELD ON TO 30 TO 40 POPS WITH ITS PASSAGE LATE MONDAY. SEVERE WEATHER LOOKS UNLIKELY AND THE AREAS THAT RECEIVE RAINFALL WILL PROBABLY BE MOST APPRECIATIVE GIVEN THE EFFECTS OF OUR RECENT DRY SPELL. FROM TUESDAY INTO THURSDAY THE SYNOPTIC PATTERN APPEARS MORE BENIGN WITH SMOOTHER FLOW ALOFT AND SURFACE HIGH PRESSURE IN THE NEIGHBORHOOD. HOWEVER...THE HIGH WILL NOT BE TERRIBLY CLEAN AND GIVEN THE SEASON IT IS ENTIRELY POSSIBLE THAT ISOLATED THUNDERSTORMS COULD DEVELOP ON ANY GIVEN DAY. DESPITE THIS...THE LACK OF ANY DISCERNIBLE FOCUS MECHANISM AND THE VERY LOW EXPECTED COVERAGE OF ANY SUCH STORMS TRANSLATES TO A NEARLY DRY FORECAST FOR THIS TIME PERIOD. THE FORECAST BECOMES INCREASINGLY DIFFICULT AFTER THURSDAY BUT SHOULD SEE SOMEWHAT BETTER RAIN CHANCES AT TIMES HEADING INTO THE WEEKEND. BY THURSDAY NIGHT A WELL DEFINED 500 MB TROUGH WILL BE MOVING SOUTHWARD INTO THE CENTRAL CANADIAN PROVINCES...WHILE FURTHER SOUTH A SHORTWAVE MOVES OVER THE CENTRAL PLAINS AND MIDWESTERN UNITED STATES. THE APPARENT LACK OF PHASING BETWEEN THESE TWO SYSTEMS MAKES THEIR FORECAST TRACKS VERY PROBLEMATIC...AND WHILE EACH WILL LIKELY BE ACCOMPANIED BY A FAIRLY LARGE AREA OF SHOWERS AND STORMS AT THIS TIME IT IS A VERY LOW CONFIDENCE PROPOSITION TO ATTEMPT TO PIN DOWN WHERE THESE AREAS WILL BE OR WHICH DAY WILL SEE THE BEST RAINFALL CHANCES OVER IOWA. FOR NOW THE FORECAST CONTAINS MAINLY 30 POPS FROM THURSDAY NIGHT THROUGH SATURDAY...AND COOLER TEMPERATURES BY THE LATTER HALF OF THE WEEKEND...BUT EXPECT THIS TO BE REFINED AS THE WEEK PROGRESSES AND MORE DATA BECOMES AVAILABLE. && .AVIATION...21/18Z ISSUED AT 1219 PM CDT SUN JUL 21 2013 MCV AND SCATTERED CONVECTION CONTINUE OVER THE REGION THIS AFTERNOON. THIS IS THE MAIN FEATURE IN THE NEXT 24 HOURS REGARDING THUNDER ACTIVITY. TIMING OF THIS HAS THE BULK OF THE CONVECTION EXITING THE NORTH AND NORTHEAST EARLY IN THE PERIOD PRIOR TO 20Z WITH LINGERING CONVECTION IN THE SOUTHEAST UNTIL 00Z. THE COVERAGE WILL DECREASE NEAR KDSM AFT 19Z AND KOTM NEARER 21-22Z. WITH BOUNDARY LAYER MOISTURE STILL RELATIVELY HIGH...SOME PATCHY FOG IS LIKELY AFT 08Z MOST AREAS TONIGHT. LITTLE FORCING EXPECTED THROUGH THE REMAINDER OF THE PERIOD SO ONCE THE FOG DOES BURN OFF AROUND 14Z...VFR CONDITIONS WILL RETURN. && .DMX WATCHES/WARNINGS/ADVISORIES...NONE. && SHORT TERM...REV LONG TERM...LEE AVIATION...REV
Hazardous weather outlook, Jul 21, 2:38 PM CDT, 1 hour 33 minutes before
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</html>In the hours before
Special weather statement, Jul 21, 1:24 PM CDT, 2 hours 47 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 124 PM CDT SUN JUL 21 2013 IAZ084-085-211930- LUCAS-MONROE- 124 PM CDT SUN JUL 21 2013 ...STRONG THUNDERSTORMS WITH GUSTY WINDS AND HEAVY RAINFALL... AT 120 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER EAST CENTRAL LUCAS COUNTY...MOVING EAST AT 15 MPH. WINDS UP TO 50 MPH...OCCASIONAL CLOUD TO GROUND LIGHTNING...BRIEF HEAVY DOWNPOURS...ARE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... MELROSE... LOVILIA... ALBIA... GUSTY WINDS MAY CAUSE SMALL BRANCHES TO BE BLOWN DOWN...AND LOOSE OBJECTS TO BLOW AROUND. STAY AWAY FROM HIGH OBJECTS OUTDOORS SUCH AS TREES. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. VACHALEK
Local storm report, Jul 21, 1:42 PM CDT, 2 hours 29 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
142 PM CDT SUN JUL 21 2013
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0115 PM HEAVY RAIN 5 W CHARITON AIRPORT 41.03N 93.46W
07/21/2013 M3.57 INCH LUCAS IA TRAINED SPOTTER
&&
BFLocal storm report, Jul 21, 1:51 PM CDT, 2 hours 20 minutes before
PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE DES MOINES IA
151 PM CDT SUN JUL 21 2013
..TIME... ...EVENT... ...CITY LOCATION... ...LAT.LON...
..DATE... ....MAG.... ..COUNTY LOCATION..ST.. ...SOURCE....
..REMARKS..
0140 PM FLASH FLOOD CHARITON 41.02N 93.31W
07/21/2013 LUCAS IA 911 CALL CENTER
LUCAS COUNTY DISPATCH REPORTS FLASH FLOODING THROUGHOUT
MUCH OF CHARITON. MULTIPLE STREETS CLOSED AND IMPASSIBLE
DUE TO RUNNING WATER OVER A FOOT DEEP.
&&
LEESpecial weather statement, Jul 21, 1:55 PM CDT, 2 hours 16 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 155 PM CDT SUN JUL 21 2013 IAZ094>096-212000- APPANOOSE-DECATUR-WAYNE- 155 PM CDT SUN JUL 21 2013 ...SPECIAL WEATHER STATEMENT... AT 153 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER SOUTH CENTRAL WAYNE COUNTY...MOVING SOUTHEAST AT 25 MPH. UP TO 50 MPH WINDS AND LOCALLY HEAVY RAINFALL IS POSSIBLE WITH THIS LINE OF STORMS AS THEY MOVE TO THE SOUTHEAST AT 25 MPH. LOCATIONS IMPACTED INCLUDE... PROMISE CITY... SEYMOUR... SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED.
Special weather statement, Jul 21, 3:53 PM CDT, 18 minutes before
SPECIAL WEATHER STATEMENT NATIONAL WEATHER SERVICE DES MOINES IA 353 PM CDT SUN JUL 21 2013 IAZ045-057-058-212130- AUDUBON-CARROLL-GUTHRIE- 353 PM CDT SUN JUL 21 2013 ...PENNY TO NICKEL HAIL POSSIBLE... AT 348 PM CDT...NATIONAL WEATHER SERVICE DOPPLER RADAR INDICATED A STRONG THUNDERSTORM OVER EXTREME NORTHEASTERN AUDUBON COUNTY...MOVING EAST AT 15 MPH. NICKEL SIZE HAIL...WINDS GREATER THAN 40 MPH...BRIEF MODERATE DOWNPOURS...ARE POSSIBLE WITH THIS STORM. LOCATIONS IMPACTED INCLUDE... COON RAPIDS... GUSTY WINDS MAY CAUSE SMALL OBJECTS SUCH AS TRASH BINS TO BLOW AROUND. SEEK SHELTER IN A STURDY STRUCTURE UNTIL THIS STORM HAS PASSED. BEERENDS
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jul 21, 11:39 AM CDT | Severe Thunderstorm Warning | DMX | Madison, Warren | 51 min |
| Jul 21, 1:47 PM CDT | Flash Flood Warning | DMX | Lucas | 6 hr |
| Jul 21, 4:41 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Guthrie | 49 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2013Every severe thunderstorm warning in 2013
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; radar from the NEXRAD Level II archive.