Alert archive / Idaho / Red Flag Warnings in 2021
Red Flag Warning 16, NWS Boise, ID
NWS Boise, ID issued this red flag warning at Sep 16, 2021, 1:24 PM MDT for 11 counties in Idaho. It took effect at Sep 17, 2021, 1:00 PM MDT. It was in force for 32 hr. 30 reports came from inside the area while it was in force.
The area
The counties it named, with what was reported inside it.
The facts
- Issued
- Sep 16, 2021, 1:24 PM MDT (19:24 UTC)
- In effect from
- Sep 17, 2021, 1:00 PM MDT
- Expired
- Sep 18, 2021, 9:00 PM MDT
- In force
- 32 hr
- Issued by
- NWS Boise, ID
Counties Boise County, ID, Camas County, ID, Elmore County, ID, Gem County, ID, Gooding County, ID, Idaho County, ID, Jerome County, ID, Lincoln County, ID, Owyhee County, ID, Twin Falls County, ID, Valley County, ID
The radar
The Boise radar (KCBX), 82 km from the middle of the area, began a volume at 19:25 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Sep 18, 12:45 PM MDT | NON-TSTM WND GST 42 | 14 Ese Hollister, ID | MESONET STATION TGFI1 TRAIL GULCH. |
| Sep 18, 1:42 PM MDT | NON-TSTM WND GST 47 | 19 Ese Riddle, ID | MESONET STATION PCKI1 POLE CREEK. |
| Sep 18, 2:00 PM MDT | NON-TSTM WND GST 57 | 10 Nw Soldier, ID | MESONET STATION SLDMT 9.8 NW SOLDIER (UUNET). |
| Sep 18, 2:31 PM MDT | NON-TSTM WND GST 44 | 13 Ssw Riddle, ID | MESONET STATION SPAI1 SHO-PAI. |
| Sep 18, 2:33 PM MDT | NON-TSTM WND GST 40 | 1 S Mccall, ID | ASOS STATION KMYL MCCALL. |
| Sep 18, 2:52 PM MDT | NON-TSTM WND GST 44 | 15 E Mackay Bar, ID | LODGEPOLE RAWS. |
| Sep 18, 2:55 PM MDT | NON-TSTM WND GST 46 | 15 Sse Silver City, ID | MESONET STATION TRII1 TRIANGLE. |
| Sep 18, 3:00 PM MDT | NON-TSTM WND GST 51 | 14 E Atlanta, ID | MESONET STATION VINMT 14.5 S OBSIDIAN (UUNET). |
| Sep 18, 3:39 PM MDT | NON-TSTM WND GST 44 | 17 Se Atlanta, ID | MESONET STATION FLEI1 FLECK SUMMIT. |
| Sep 18, 3:55 PM MDT | NON-TSTM WND GST 41 | 32 Wnw Riddle, ID | MESONET STATION BFRI1 BRACE FLAT. |
| Sep 18, 3:55 PM MDT | NON-TSTM WND GST 43 | 17 Wsw Hagerman, ID | MESONET STATION TWBI1 TWIN BUTTES. |
| Sep 18, 4:08 PM MDT | NON-TSTM WND GST 41 | 4 Ssw Horseshoe Bend, ID | MESONET STATION EW2058 HORSESHOE BEND. |
| Sep 18, 4:18 PM MDT | NON-TSTM WND GST 41 | 4 Ssw Horseshoe Bend, ID | MESONET STATION EW2058 HORSESHOE BEND. |
| Sep 18, 4:31 PM MDT | NON-TSTM WND GST 45 | 13 Ssw Riddle, ID | MESONET STATION SPAI1 SHO-PAI. |
| Sep 18, 4:45 PM MDT | NON-TSTM WND GST 49 | 14 Ese Hollister, ID | MESONET STATION TGFI1 TRAIL GULCH. |
| Sep 18, 4:49 PM MDT | NON-TSTM WND GST 49 | 16 Nw Mountain Home, ID | MESONET STATION UP237 16.0 N MOUNTAIN HOME AFB (UPR). |
| Sep 18, 4:52 PM MDT | NON-TSTM WND GST 42 | 20 Wsw Castleford, ID | MESONET STATION HBFI1 HORSE BUTTE. |
| Sep 18, 5:00 PM MDT | NON-TSTM WND GST 41 | 5 Sse Grand View, ID | MESONET STATION GDVI 5.2 SE GRAND VIEW (AGRIMET). |
| Sep 18, 5:05 PM MDT | NON-TSTM WND GST 55 | 1 S Mountain Home Afb, ID | AWOS STATION KMUO MOUNTAIN HOME AFB. |
| Sep 18, 5:25 PM MDT | NON-TSTM WND GST 54 | 8 Wnw Mountain Home Afb, ID | MESONET STATION TS962 7 WNW MOUNTAIN HOME AFB. |
| Sep 18, 5:31 PM MDT | NON-TSTM WND GST 47 | 13 Ssw Riddle, ID | MESONET STATION SPAI1 SHO-PAI. |
| Sep 18, 5:44 PM MDT | NON-TSTM WND GST 41 | 10 Ssw Hill City, ID | MESONET STATION DEHI1 DEER HAVEN. |
| Sep 18, 5:52 PM MDT | NON-TSTM WND GST 43 | 20 Wsw Castleford, ID | MESONET STATION HBFI1 HORSE BUTTE. |
| Sep 18, 5:55 PM MDT | NON-TSTM WND GST 53 | 17 Wsw Hagerman, ID | MESONET STATION TWBI1 TWIN BUTTES. |
| Sep 18, 6:00 PM MDT | NON-TSTM WND GST 43 | 7 Ssw Glenns Ferry, ID | MESONET STATION GFRI 6.7 SW GLENNS FERRY (AGRIMET). |
| Sep 18, 6:02 PM MDT | NON-TSTM WND GST 42 | 7 Se Hot Springs, ID | MESONET STATION TT087 SAYLOR CREEK. |
| Sep 18, 6:05 PM MDT | NON-TSTM WND GST 41 | 2 W Mountain Home, ID | AWOS STATION KU76 1 W MOUNTAIN HOME. |
| Sep 18, 6:15 PM MDT | NON-TSTM WND GST 50 | 5 Sse Mountain Home, ID | MESONET STATION UP078 4.6 SE MOUNTAIN HOME (UPR). |
| Sep 18, 6:52 PM MDT | NON-TSTM WND GST 52 | 1 S Mountain Home Afb, ID | MESONET STATION MTHI1 MOUNTAIN HOME AFB RAWS. |
| Sep 18, 6:55 PM MDT | NON-TSTM WND GST 58 | 6 S Twin Falls, ID | ASOS STATION KTWF TWIN FALLS. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Boise Airport, ID (KBOI), launched 12:00Z, 7.4 hours before the alert went out and 79 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
- 2777 m above ground
- 0-6 km bulk shear
- 55 kt
- 0-1 km storm-relative helicity
- -168 m²/s²
- 0-3 km storm-relative helicity
- -80 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
560 WWUS85 KBOI 161924 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 124 PM MDT Thu Sep 16 2021 ...RED FLAG WARNING ISSUED FOR STRONG WINDS AND LOW RH... .Strong winds and low relative humidity ahead of an upper level system and accompanying cold front will produce dangerous fire weather conditions Friday afternoon through Saturday evening. The mountains of central Idaho will be the first to see the effects, with winds increasing Friday afternoon. Due to poor recovery RH overnight, we are extending the warning in the mountains through the overnight hours all the way into Saturday evening. In the lower elevation districts in Idaho, and in southeast Oregon, the warning starts Saturday afternoon and extends into Saturday evening. This event will be followed by wetting rains behind the cold front, with rain starting in eastern Oregon Saturday evening and moving east through the weekend, ending in southwest Idaho Monday. IDZ402-403-421-171500- /O.NEW.KBOI.FW.W.0016.210917T1900Z-210919T0300Z/ Eastern Payette National Forest-Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- 124 PM MDT Thu Sep 16 2021 ...RED FLAG WARNING IN EFFECT FROM 1 PM FRIDAY TO 9 PM MDT SATURDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR EASTERN PAYETTE NATIONAL FOREST...NORTHERN BOISE NATIONAL FOREST AND SOUTHERN BOISE NATIONAL FOREST/WESTERN SAWTOOTH NATIONAL FOREST... WHICH ARE FIRE WEATHER ZONES 402...403 AND 421... The National Weather Service in Boise has issued a Red Flag Warning, which is in effect from 1 PM Friday to 9 PM MDT Saturday. * WINDS...Gusts to 30 mph Friday and 40 mph Saturday. * RELATIVE HUMIDITY...10 to 15 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ IDZ423-424-426-ORZ636-637-171500- /O.NEW.KBOI.FW.W.0016.210918T1900Z-210919T0300Z/ Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Burns BLM-Vale BLM- 124 PM MDT Thu Sep 16 2021 /1224 PM PDT Thu Sep 16 2021/ ...RED FLAG WARNING IN EFFECT FROM 1 PM MDT /NOON PDT/ TO 9 PM MDT /8 PM PDT/ SATURDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM... SOUTHERN HIGHLANDS...BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 423...424...426...636 AND 637... The National Weather Service in Boise has issued a Red Flag Warning, which is in effect from 1 PM MDT /noon PDT/ to 9 PM MDT /8 PM PDT/ Saturday. * WINDS...Gusts 30 to 40 mph. * RELATIVE HUMIDITY...8 to 15 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ W
5 follow-up statements
081 WWUS85 KBOI 171436 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 836 AM MDT Fri Sep 17 2021 ...RED FLAG WARNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES... .Gusty winds and low relative humidities ahead of an upper level system and accompanying cold front will produce dangerous fire weather conditions this afternoon through Saturday evening. IDZ402-403-421-181500- /O.CON.KBOI.FW.W.0016.210917T1900Z-210919T0300Z/ Eastern Payette National Forest-Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- 836 AM MDT Fri Sep 17 2021 ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM THIS AFTERNOON TO 9 PM MDT SATURDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR EASTERN PAYETTE NATIONAL FOREST...NORTHERN BOISE NATIONAL FOREST AND SOUTHERN BOISE NATIONAL FOREST/WESTERN SAWTOOTH NATIONAL FOREST... WHICH ARE FIRE WEATHER ZONES 402...403 AND 421... * WINDS...Gusts to 30 mph today and 40 mph Saturday. * RELATIVE HUMIDITY...10 to 15 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ IDZ423-424-426-ORZ636-637-181500- /O.CON.KBOI.FW.W.0016.210918T1900Z-210919T0300Z/ Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Burns BLM-Vale BLM- 836 AM MDT Fri Sep 17 2021 /736 AM PDT Fri Sep 17 2021/ ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM MDT /NOON PDT/ TO 9 PM MDT /8 PM PDT/ SATURDAY FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM... SOUTHERN HIGHLANDS...BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 423...424...426...636 AND 637... * WINDS...Gusts 30 to 40 mph. * RELATIVE HUMIDITY...8 to 15 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ W
214 WWUS85 KBOI 181410 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 810 AM MDT Sat Sep 18 2021 ...RED FLAG WARNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES... .Gusty winds and low relative humidities ahead of an upper level system and accompanying cold front will produce dangerous fire weather conditions through this evening. The front will enter eastern Oregon early this afternoon, move into the mountain districts of Idaho from late this afternoon into this evening, and move into the remainder of southwest Idaho this evening. Rain will follow these winds from this evening through Sunday with wetting rains likely in most areas. IDZ402-403-421-182215- /O.CON.KBOI.FW.W.0016.000000T0000Z-210919T0300Z/ Eastern Payette National Forest-Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- 810 AM MDT Sat Sep 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR EASTERN PAYETTE NATIONAL FOREST...NORTHERN BOISE NATIONAL FOREST AND SOUTHERN BOISE NATIONAL FOREST/WESTERN SAWTOOTH NATIONAL FOREST... WHICH ARE FIRE WEATHER ZONES 402...403 AND 421... * WINDS...Gusts to 30 mph today and 40 mph Saturday. * RELATIVE HUMIDITY...10 to 20 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ IDZ423-424-426-ORZ636-637-182215- /O.CON.KBOI.FW.W.0016.210918T1900Z-210919T0300Z/ Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Burns BLM-Vale BLM- 810 AM MDT Sat Sep 18 2021 /710 AM PDT Sat Sep 18 2021/ ...RED FLAG WARNING REMAINS IN EFFECT FROM 1 PM MDT /NOON PDT/ THIS AFTERNOON TO 9 PM MDT /8 PM PDT/ THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM... SOUTHERN HIGHLANDS...BURNS BLM AND VALE BLM... WHICH ARE FIRE WEATHER ZONES 423...424...426...636 AND 637... * WINDS...Gusts 30 to 40 mph. * RELATIVE HUMIDITY...9 to 15 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ W
802 WWUS85 KBOI 181856 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 1256 PM MDT Sat Sep 18 2021 ...RED FLAG WARNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES... .Gusty winds and low relative humidities ahead of an upper level system and accompanying cold front will produce dangerous fire weather conditions through this evening. The front will enter eastern Oregon early this afternoon, move into the mountain districts of Idaho from late this afternoon into this evening, and move into the remainder of southwest Idaho this evening. Rain will follow these winds from this evening through Sunday with wetting rains likely in most areas. IDZ423-424-426-ORZ636-637-190300- /O.CON.KBOI.FW.W.0016.210918T1900Z-210919T0300Z/ Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Burns BLM-Vale BLM- 1256 PM MDT Sat Sep 18 2021 /1156 AM PDT Sat Sep 18 2021/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT /8 PM PDT/ THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM...SOUTHERN HIGHLANDS... BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 423...424... 426...636 AND 637... * WINDS...Gusts 30 to 40 mph. * RELATIVE HUMIDITY...7 to 15 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ IDZ402-403-421-190300- /O.CON.KBOI.FW.W.0016.000000T0000Z-210919T0300Z/ Eastern Payette National Forest-Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- 1256 PM MDT Sat Sep 18 2021 ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR EASTERN PAYETTE NATIONAL FOREST...NORTHERN BOISE NATIONAL FOREST AND SOUTHERN BOISE NATIONAL FOREST/WESTERN SAWTOOTH NATIONAL FOREST...WHICH ARE FIRE WEATHER ZONES 402...403 AND 421... * WINDS...Gusts 30 to 50 mph. * RELATIVE HUMIDITY...10 to 20 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ W
828 WWUS85 KBOI 182041 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 241 PM MDT Sat Sep 18 2021 ...RED FLAG WARNING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES... .Gusty winds and low relative humidities ahead of an upper level system and accompanying cold front will produce dangerous fire weather conditions through this evening. The front has entered eastern Oregon, and will move into the mountain districts of Idaho from late this afternoon into this evening, and move into the remainder of southwest Idaho this evening. Rain will follow the cold front and last through Sunday, with wetting rains likely in most areas. ORZ636-182145- /O.CAN.KBOI.FW.W.0016.000000T0000Z-210919T0300Z/ Burns BLM- 141 PM PDT Sat Sep 18 2021 ...RED FLAG WARNING IS CANCELLED FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM... SOUTHERN HIGHLANDS... BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 423...424... 426...636 AND 637... The National Weather Service in Boise has cancelled the Red Flag Warning. Rain showers have moved into most of the Burns BLM, raising the RH well above Red Flag criteria. Therefore, the warning has been cancelled. $$ IDZ402-403-421-423-424-426-ORZ637-190300- /O.CON.KBOI.FW.W.0016.000000T0000Z-210919T0300Z/ Eastern Payette National Forest-Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Vale BLM- 241 PM MDT Sat Sep 18 2021 /141 PM PDT Sat Sep 18 2021/ ...RED FLAG WARNING REMAINS IN EFFECT UNTIL 9 PM MDT /8 PM PDT/ THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM...SOUTHERN HIGHLANDS... BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 423...424... 426...636 AND 637... * WINDS...Gusts 30 to 50 mph. * RELATIVE HUMIDITY...8 to 20 percent. PRECAUTIONARY/PREPAREDNESS ACTIONS... A Red Flag Warning means that critical fire weather conditions are either occurring now, or will occur shortly. && $$ W
369 WWUS85 KBOI 190256 RFWBOI URGENT - FIRE WEATHER MESSAGE National Weather Service Boise ID 856 PM MDT Sat Sep 18 2021 ...RED FLAG WILL EXPIRE AT 9 PM MDT... IDZ402-403-421-423-424-426-ORZ637-190400- /O.EXP.KBOI.FW.W.0016.000000T0000Z-210919T0300Z/ Eastern Payette National Forest-Northern Boise National Forest- Southern Boise National Forest/Western Sawtooth National Forest- Owyhee Mountains-Western Twin Falls BLM-Southern Highlands- Vale BLM- 856 PM MDT Sat Sep 18 2021 /756 PM PDT Sat Sep 18 2021/ ...RED FLAG WARNING WILL EXPIRE AT 9 PM MDT /8 PM PDT/ THIS EVENING FOR GUSTY WINDS AND LOW RELATIVE HUMIDITIES FOR OWYHEE MOUNTAINS...WESTERN TWIN FALLS BLM...SOUTHERN HIGHLANDS... BURNS BLM AND VALE BLM...WHICH ARE FIRE WEATHER ZONES 423...424... 426...636 AND 637... Winds across the area have weakened this evening and will continue to do so overnight. Additionally, relative humidity levels have rebounded to above critical values. Therefore, the warning will be allowed to expire at 9 PM MDT. $$ W
Nearby
Red Flag Warnings in Idaho, 2021Red Flag Warnings in Oregon, 2021Every red flag warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.